TY - CONF
A1 - Cakir, Cafer Tufan
T1 - Algorithm-Assisted Multimodal Synchrotron Experiments: XRD–XES Integration and SpecTwin
N2 - Multimodal synchrotron-based techniques are emerging as powerful tools for advanced materials characterization, enabling simultaneous insights into both crystal and electronic structure. We present a combined X-ray diffraction (XRD) and high-resolution X-ray emission spectroscopy (XES) approach implemented in a double-dispersive setup. This configuration enables simultaneous acquisition of structural and spectroscopic information with high precision, allowing us to resolve correlations between lattice arrangements and electronic configurations under in situ conditions.
To enhance experimental throughput and reproducibility, we employ digital twin concepts and optimization algorithms for experiment design and parameter control. These methods effectively eliminate trial-and-error procedures when optimizing the setup to achieve the desired resolution for XES analysis. In addition, we introduce SpecTwin, a dedicated software environment that integrates XES data analysis, simulation, and optimization routines.
This combined methodology underscores the potential of algorithm-assisted multimodal X-ray experiments to advance the quantitative understanding of structure–property relationships in complex materials.
T2 - Joint BAM-HZB Symposium on Multimodal Synchrotron Experiments for Next-Generation Materials Research
CY - Berlin, Germany
DA - 25.02.2026
KW - XAS
KW - Digital Twin
KW - Optimization
KW - Multimodal
PY - 2026
AN - OPUS4-65608
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Ryll, Tom William
T1 - Multi-modal characterization for transformation of gypsum to anhydrite
N2 - We investigate recycling of gypsum waste materials and have developed a method to synthesize phase pure anhydrite in solution, while contaminants could easily be separated from products. In-situ XRD measurements were conducted in a dedicated automation setup at BESSY II to find exact reaction conditions and were supported by in-situ Raman spectroscopy.
T2 - Joint BAM-HZB Symposium on Multimodal Synchrotron Experiments for Next-Generation Materials Research
CY - Berlin, Germany
DA - 25.02.2026
KW - Recycling
KW - Automation
KW - Synchrotron XRD
KW - Raman spectroscopy
KW - Gypsum
PY - 2026
AN - OPUS4-65607
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Ruehle, Bastian
T1 - A Self-Driving Lab for Nano and Advanced Materials Synthesis in a Self-Driving Lab
N2 - In this contribution, we present our Self-Driving Lab (SDL) for Nano and Advanced Materials, that integrates robotics for batched autonomous synthesis – from molecular precursors to fully purified nanomaterials – with automated characterization and data analysis, for a complete and reliable nanomaterial synthesis workflow. By fully automating the processing steps for seven different materials from five representative, completely different classes of nano- and advanced materials (metal, metal oxide, silica, metal organic framework, and core–shell particles) that follow different reaction mechanisms, we demonstrate the great versatility and flexibility of the platform. The system also exhibits high modularity and adaptability in terms of reaction scales and incorporates in-line characterization measurement of hydrodynamic diameter, zeta potential, and optical properties (absorbance, fluorescence). We discuss the excellent reproducibility of the various materials synthesized on the platform in terms of particle size and size distribution, and the adaptability and modularity that allows access to a diverse set of nanomaterial classes.
We also present several key aspects of the central backend that orchestrates the (parallelized) syntheses workflows. One key feature is the resource management or “traffic control” for scheduling and executing parallel reactions in a multi-threaded environment. Another is the interface with data analysis algorithms from in-line, at-line, and off-line measurements. Here, we will give examples of how automatic image segmentation of electron microscopy images with the help of AI can be used for reducing the “data analysis bottleneck” from an off-line measurement. We will also discuss various machine learning (ML) algorithms that are currently implemented in the backend and can be used for ML-guided, closed-loop material optimization in our SDL. Lastly, we will show our recent efforts in making the workflow generation on SDLs more user-friendly by using large language models to generate executable workflows automatically from synthesis procedures given in natural language and user-friendly graphical user interfaces based on node editors that also allow for knowledge graph extraction from the workflows. In this context, we are currently also working on a common description or ontology for representing the process steps and parameters of the workflows, which will greatly facilitate the semantic description and interoperability of workflows between different SDL hardware and software platforms.
T2 - Series on Digitalisation-Meet the Experts | Special Topic: Automation
CY - Berlin, Germany
DA - 27.02.2026
KW - Self-Driving Labs
KW - Materials Acceleration Platforms
KW - Advanced Materials
KW - Nanomaterials
KW - Automation
KW - Digitalization
PY - 2026
AN - OPUS4-65604
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - RPRT
A1 - Falkenhagen, Jana
A1 - Beskers, Timo. F.
A1 - Myxa, Anett
A1 - Pursch, Matthias
T1 - Round-robin test for size exclusion chromatography – Data summary
N2 - Size exclusion chromatography (SEC or GPC) is one critical component of polymer analysis to meet the increasing requirements in regulatory context – namely, determination of Mn, as well as oligomers of less than 500 g mol-1 and 1000 g mol-1. The underlying test methods (OECD 118/119 and DIN EN ISO 13885 1 to 3) provide a framework for SEC measurements; however, they lack sufficient specificity to obtain accurate results. Previous SEC round robin tests were mostly performed on homopolymers and did not collect data on oligomer contents.
A new round robin test was initiated and conceptualized within the Task force “Method Evaluation for Polymer REACh (MeEP)”, an initiative of “Industrieforum Analytik” within the German Chemical Society (GDCh). Samples for this study were selected to represent both easy benchmark polymers as well as real-life, industry-relevant polymer materials. Data collection focused on the regulatory requirements.
Distribution of samples, gathering of individual results and evaluation were carried out by BAM. A data summary as initial result is reported here. Further evaluation and interpretation are a part of ongoing research.
KW - Size exclusion chromatography
KW - Polymers
KW - Oligomer content
KW - Round-robin test
PY - 2026
DO - https://doi.org/10.26272/opus4-65587
SP - 1
EP - 84
PB - Bundesanstalt für Materialforschung und -prüfung (BAM)
CY - Berlin
AN - OPUS4-65587
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Lange, Diana
A1 - Hahn, Oliver
T1 - Colours on Maps - Purpose and Materiality
N2 - Colours are an inseparable attribute of most maps. While colouring seems at first glance simply superficial ‘prettifying’ of maps, most maps were given colours for other reasons: colour is an important key to understanding the function and use of maps. The use of colours, the choice of where to assign them and the meaning given to them has accordingly never been static but has changed over time. In this context, the three aspects: colour system, colour scheme, and colour code are of particular importance.
Material scientific analysis makes it possible to find out more about the material composition of colourants (pigments and dyes) on maps. The study of colourants provides insights into the production conditions and use of maps. Furthermore, it offers clues about colour changes and forms the basis for appropriate restoration concepts.
T2 - Maps. Digital. Analogue
CY - Oxford, United Kingdom of Great Britain and Northern Ireland
DA - 26.02.2026
KW - Maps
KW - Colours
KW - Archaeometry
KW - Aging
PY - 2026
AN - OPUS4-65599
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Zaki, Mohammad
T1 - Nano-And Advanced Materials Synthesis In A Self-Driving Lab (SDL)
N2 - Nano- and advanced materials are recognized as key enabling technologies of the 21st century, offering exceptional potential to drive innovation and tackle pressing challenges in materials science. To fully realize this potential, it is essential to develop and improve tools that accelerate their design, development, and optimization.
Recognizing this pressing need, we present a Self-Driving Lab (SDL) that integrates robotics for batched autonomous synthesis – from molecular precursors to fully purified nanomaterials, with automated characterization and data analysis, for a complete and reliable nanomaterial synthesis workflow. By fully automating these three process steps for seven different materials from five representative, completely different classes of nano- and advanced materials (metal, metal oxide, silica, metal organic framework, and core–shell particles) that follow different reaction mechanisms, we demonstrate the great versatility and flexibility of the platform. The system also exhibits modularity, impressive adaptability in terms of reactions scales and incorporates in-line characterization measurement of hydrodynamic diameter, zeta potential, and optical properties (absorbance, fluorescence) of the nanomaterials, along with automating data analysis of at-line or off-line characterization techniques such as electron microscopy image analyses.
Automated characterization and data analysis is complemented by a machine learning–driven feedback loop employing active learning algorithms (e.g., Bayesian optimization, artificial neural networks, and downhill simplex methods) to iteratively suggest new experimental parameters toward desired material properties.
Therefore, the excellent reproducibility for material syntheses when run on the SDL platform multiple times, the material agnostic behavior, the adaptability, and modularity, underscore the SDL’s reliability and potential as a transformative tool for advancing the development and applications of nano- and advanced materials, offering solutions for a sustainable future.
T2 - Gordon Research Seminar and Conference, Multifunctional Materials and Structures-conference
CY - Ventura, CA, USA
DA - 24.01.2026
KW - Self-Driving Laboratories
KW - Materials Acceleration Platforms
KW - Nanomaterials
PY - 2026
AN - OPUS4-65597
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Zaki, Mohammad
T1 - Nano- and Advanced Materials Synthesis in a Self-Driving Lab
N2 - Nano- and advanced materials are recognized as key enabling technologies of the 21st century, offering exceptional potential to drive innovation and tackle pressing challenges in materials science [1]. To fully realize this potential, it is essential to develop and improve tools that accelerate their design, development, and optimization.
Recognizing this pressing need, we present a Self-Driving Lab (SDL) [2] that integrates robotics for batched autonomous synthesis – from molecular precursors to fully purified nanomaterials, with automated characterization and data analysis, for a complete and reliable nanomaterial synthesis workflow. By fully automating these three process steps for seven different materials from five representative, completely different classes of nano- and advanced materials (metal, metal oxide, silica, metal organic framework, and core–shell particles) that follow different reaction mechanisms, we demonstrate the great versatility and flexibility of the platform. The system also exhibits modularity, impressive adaptability in terms of reactions scales and incorporates in-line characterization measurement of hydrodynamic diameter, zeta potential, and optical properties (absorbance, fluorescence) of the nanomaterials, along with automating data analysis of at-line or off-line characterization techniques such as electron microscopy image analyses [3].
Automated characterization and data analysis is complemented by a machine learning–driven feedback loop employing active learning algorithms (e.g., Bayesian optimization, artificial neural networks, and downhill simplex methods) to iteratively suggest new experimental parameters toward desired material properties.
Therefore, the excellent reproducibility for material syntheses when run on the SDL platform multiple times, the material agnostic behavior, the adaptability, and modularity, underscore the SDL’s reliability and potential as a transformative tool for advancing the development and applications of nano- and advanced materials, offering solutions for a sustainable future.
T2 - Gordon Research Seminar and Conference
CY - Ventura, CA, USA
DA - 24.01.2026
KW - Self-Driving Laboratories
KW - Materials Acceleration Platforms
KW - Nanomaterials
PY - 2026
AN - OPUS4-65596
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Jägle, Eva
A1 - Tuladhar, Rujika
A1 - Niederleithinger, Ernst
A1 - Epple, Niklas
A1 - Sanchez Trujillo, Camila Andrea
A1 - Gehlen, Christoph
A1 - Timothy, Jithender J.
T1 - Evaluation of ultrasonic signals collected from laboratory concrete specimens: Preprocessing and analysis with coda wave interferometry
N2 - Efficient maintenance of infrastructure relies on monitoring and assessment of its condition. New technologies and methods thereby enable a deeper understanding of the materials used and of the structures built. Coda Wave Interferometry (CWI) is currently explored for continuous monitoring of reinforced concrete structures as well as material testing. This ultrasound-based method is sensitive to even small material alterations and therefore suitable for the detection of initial damage stages. Herein, a step-by-step procedure for the evaluation of ultrasonic signals with CWI methods is presented. The described procedure is proposed for ultrasonic signals collected with embedded ultrasonic transducers with a center frequency of 50 kHz to 70 kHz from prism-shaped concrete specimen with dimensions of 400 mm x 100 mm x 100 mm. The raw ultrasonic signal, preprocessing and CWI analysis are described and influences of parameters within the analysis are discussed. The presented procedure allows systematic and comparable analysis of ultrasonic signals generated with similar conditions and therefore contributes to the application of CWI methods for structural health monitoring and material testing.
KW - Ultrasound
KW - Concrete
KW - Coda wave interferometry
KW - Structural health monitoring
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-656027
DO - https://doi.org/10.1016/j.mex.2026.103811
SN - 2215-0161
VL - 16
SP - 1
EP - 19
PB - Elsevier B.V.
AN - OPUS4-65602
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - WójciaK, K.
A1 - Tokarski, T.
A1 - Cios, G.
A1 - Winkelmann, A.
A1 - Chulist, R.
A1 - Nolze, G.
T1 - Unconventional Applications of Electron Backscattering Diffraction (EBSD) in Metallic Materials
N2 - Electron backscattered diffraction is widely used for phase and orientation imaging of crystalline specimens. Despite the inherent complexity of diffraction images, current analysis methodologies typically focus on the position of Kikuchi bands or direct comparisons between experimental and simulated patterns. These approaches require prior knowledge of the phases to be analyzed, limiting their applicability in certain scenarios. This paper introduces an alternative methodology, crystallographic analysis of lattice metric, which extracts phase and orientation information directly from the registered diffraction pattern without requiring predefined standards. The paper outlines the methodology, discusses limitations, and demonstrates possible application in phase analysis, lattice parameter ratio mapping, and qualitative lattice distortion mapping.
KW - EBSD
KW - Virtual dark-field imaging
KW - Lattice distortion
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-656014
DO - https://doi.org/10.24425/amm.2025.156241
VL - 70
IS - 4
SP - 1619
EP - 1626
AN - OPUS4-65601
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Baer, Wolfram
T1 - Statistische Auswertung der SE(B)-Bruchzähigkeitsdatenbasis und Untersuchungen zum Bruchmechanismus - Neue Ergebnisse zur Untersuchung des Master Curve Konzepts für ferritisches Gusseisen mit Kugelgraphit bei dynamischer Beanspruchung (Projekt MCGUSS)
N2 - Die Zielstellung des laufenden Kooperationsprojektes MCGUSS zwischen der BAM Berlin und der MPA Stuttgart ist es, das probabilistische Master Curve (MC)-Konzept hinsichtlich seiner Übertragbarkeit auf ferritisches Gusseisen mit Kugelgraphit (DCI) zu untersuchen. Über Teilergebnisse der Arbeiten wurde bereits auf den Jahrestagungen 2023 bis 2025 des DVM-AK Bruchmechanik und Bauteilsicherheit berichtet. Der vorliegende Beitrag hat zwei Schwerpunkte.
Zum einen wurde die Datenbasis der dynamischen Bruchzähigkeit für SE(B)-Proben der Dicken 10 mm, 25 mm und 140 mm auf insgesamt 101 Versuche bei Temperaturen von -40 °C bis -140 °C erweitert, statistisch ausgewertet sowie MC-Analysen unterzogen. Die Ergebnisse zeigen, dass die Daten sich zwar mit einer Weibullverteilung gut beschreiben lassen, die MC-Methode nach ASTM E1921 jedoch nicht ohne Weiteres anwendbar ist, sondern Modifikationen erforderlich sind.
Des Weiteren werden neue Ergebnisse zum werkstoffspezifischen Bruchmechanismus bei dynamischer Belastung im unteren Übergangsbereich der Zähigkeit diskutiert. Die fraktographische Datenbank wurde durch REM-Analysen weiterer Bruchflächen von SE(B)25-Proben bei -40 °C, -60 °C und -80 °C ergänzt. Die Ergebnisse unterstreichen die prägende Rolle, die Rissarrestereignissen im Verlauf des dynamischen Sprödbruchversagens bei DCI zukommt. Der in MCGUSS zur Erklärung eines gegenüber Stahl inversen Probengrößeneinflusses vorgeschlagene Mechanismus „Specimen size-dependent arrest of local brittle fractures before global brittle failure by weakest link“ wird dadurch weiter unterstützt.
T2 - DVM-Jahrestagung 2026 des Arbeitskreises Bruchmechanik und Bauteilsicherheit
CY - Stuttgart, Germany
DA - 24.02.2026
KW - Dynamic fracture toughness
KW - Ductile cast iron
KW - Safety assessment
KW - Master curve
KW - Statistics
PY - 2026
AN - OPUS4-65593
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - George, Janine
T1 - Crossing Scientific Disciplines with Materials Informatics:� From Atoms to Algorithms
N2 - Within this talk, I introduced students from Physics to Materials Informatics. To provide a context for this research, I have introduced the students to BAM and its tasks. I then started to introduce our activity field materials design, including materials acceleration platforms. Then, I explained how simulations speed up the materials searches as parf of materials acceleration platforms.
T2 - jDPG Jena Meeting - Poland exchange
CY - Jena, Germany
DA - 26.02.2026
KW - Automation
KW - Machine Learning
KW - Materials Design
KW - Batteries
KW - Workflows
PY - 2026
AN - OPUS4-65589
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Sander, Luise
T1 - Linking material and electrode properties to the cell performance of commercially available sodium-ion cells
N2 - As the first commercial sodium-ion-batteries (SIBs) are available for purchase, it is possible to investigate material composition. Gaining an insight into the material composition of these SIBs is of interest not only for the classification of possible safety risks and hazards, but also in regard to recycling. Herein we report the preliminary investigations of the chemical and structural composition of first commercial SIB-cells.[1,2] Two different SIB-cell types were compared in terms of electrode size, thickness, loading etc. Furthermore, the composition of the active materials and electrolyte was investigated and compared. Finally, the gained results were linked to the different data sheet performance of the two cell types.
T2 - Batterieforum Deutschland 2026
CY - Berlin, Germany
DA - 20.01.2026
KW - Electrochemical Energy Storage
KW - Battery
KW - Sodium-ion-battery
KW - EES
KW - Energy Storage
PY - 2026
AN - OPUS4-65588
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eddah, Mustapha
T1 - Multi-Energy High Dynamic Range (HDR) Synchrotron X-ray Computed Tomography applied to LTCC samples
N2 - Synchrotron X-ray computed tomography (SXCT) is regularly used in materials science to correlate structural properties with macroscopic properties and to optimize manufacturing processes. The X-ray beam energy must be adapted to the sample properties, such as size and density. If both strongly and weakly absorbing materials are present, the contrast to the weakly absorbing materials is lost, resulting in image artifacts and a poor signal-to-noise ratio (SNR). One example is a low-temperature co-fired ceramics (LTCC), in which metal connections are embedded in a ceramic matrix and form 3-dimensional conducting structures. This article describes a method of combining SXCT scans acquired at different beam energies, significantly reducing metal artifacts, and improving image quality. We show how to solve the difficult task of merging the scans at low and high beam energy. Our proposed merging approach achieves up to 35% improvement in SNR within ceramic regions adjacent to metallic conductors. In this way, previously inaccessible regions within the ceramic structure close to the metallic conductors are made accessible.
T2 - iCT 2026
CY - Linz, Austria
DA - 10.02.2026
KW - Synchrotron x-ray CT
KW - Multi-energy CT
KW - Low-Temperature cofired ceramics
PY - 2026
AN - OPUS4-65586
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eddah, Mustapha
T1 - Multi-Energy High Dynamic Range (HDR) Synchrotron X-ray Computed Tomography applied to LTCC samples
N2 - Synchrotron X-ray computed tomography (SXCT) is regularly used in materials science to correlate structural properties with macroscopic properties and to optimize manufacturing processes. The X-ray beam energy must be adapted to the sample properties, such as size and density. If both strongly and weakly absorbing materials are present, the contrast to the weakly absorbing materials is lost, resulting in image artifacts and a poor signal-to-noise ratio (SNR). One particular example is a low-temperature co-fired ceramics (LTCC), in which metal connections are embedded in a ceramic matrix and form 3-dimensional conducting structures. This article describes a method of combining SXCT scans acquired at different beam energies, significantly reducing metal artifacts, and improving image quality. We show how to solve the difficult task of merging the scans at low and high beam energy. Our proposed merging approach achieves up to 35 % improvement in SNR within ceramic regions adjacent to metallic conductors. In this way, previously inaccessible regions within the ceramic structure close to the metallic conductors are made accessible.
T2 - iCT 2026
CY - Linz, Austria
DA - 10.02.2026
KW - Synchrotron x-ray CT
KW - Reconstruction algorithm
KW - Low-Temperature cofired ceramics
KW - Data merging
PY - 2026
AN - OPUS4-65583
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Askar, Enis
T1 - Safety in Energy Gases "Explosion Protection"
N2 - The legal framework and standards for explosion protection are presented briefly and than the three basic principles of explosion protection are shown one by one: Avoiding Explosive Mixtures, Avoiding Ignition Sources and Mitigation of Consequences. For each of these the relevant safety characteristics and methods of implementation are shown. Finally references for Safety characteristic data and literature sources are shown and the safety characteristics of different fuel gases are summarized and compared.
T2 - European Metrology Network for Energy Gases Training Session
CY - Online meeting
DA - 25.02.2026
KW - Safety characteristics
KW - Energy carrier
KW - Ignition
KW - Safety
PY - 2026
AN - OPUS4-65582
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Kumar, Sourabh
T1 - Grain Boundary Transformation Induced by Boron Segregation
N2 - The segregation of solute atoms at grain boundaries (GBs) plays a critical role in defining the mechanical properties of materials, including corrosion resistance and fracture toughness. This study investigates the structural transformations induced by minimal boron concentrations at Σ13 GBs in ferrite thin films synthesized. Two sample protocols were examined: one with carbon as the sole solute and the other with carbon and boron co-segregation. To understand the thermodynamics of such phases, we employed ab initio calculations to meticulously examine the competing Σ13 GB phases that coexist in the presence of defects and stacking faults. Building on our findings regarding these competing GB phases, we analyzed the energetic aspects of solute segregation at the GB interface. Furthermore, we constructed a defect phase diagram to gain insights into the influence of Boron concentration on the evolution of GB structure. We reveal that boron segregation transforms the GB structure from flat to zigzag trigonal prisms by forming new chemical bonds, ultimately enhancing bonding strength between boron and iron atoms by 5%. This transformation doubles steel's resistance to fracture and provides valuable insights into the thermodynamic and energetic aspects of solute-driven GB phase evolution. These findings contribute to developing innovative strategies for designing high-performance steel with enhanced mechanical integrity and durability.
T2 - DPG 2025 Regensburg
CY - Regensburg, Germany
DA - 16.03.2025
KW - Defect Phases
KW - Grain Boundary
KW - Steel
PY - 2025
AN - OPUS4-65580
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CHAP
A1 - Hahn, Oliver
A1 - Steimer, Hans Gerhard
ED - Christen, Felix
ED - Vöhler, Martin
T1 - Hölderlins Tinten. Röntgenfluoreszenzanalyse an Handschriften des Spätwerks
N2 - Erstmalig in der Hölderlin-Forschung wurde mit dem Projekt der geisteswissenschaftlichen Methodik – über die Beachtung der Wasserzeichen hinaus – ein materialwissenschaftlicher Ansatz zur Seite gestellt, um Arbeitsphasen im Werk Friedrich Hölderlins sichtbar zu machen. Wesentlich ist dabei die Verzahnung von philologischer und naturwissenschaftlicher Perspektive.
Wesentlicher Bestandteil der Messungen bildet das sogenannte Homburger Folioheft. Weiterhin wurden Briefe und Manuskripte aus den Beständen der Württembergische Landesbibliothek sowie zwei eigenhändige Gehaltsquittungen aus dem Hessischen Hauptstaatsarchiv Wiesbaden untersucht.
Zwei in mehreren Manuskripten klar unterscheidbare Tinten lassen sich mit einiger Wahrscheinlichkeit biografisch mit dem Zeitraum zwischen Hölderlins Rückkehr aus der Schweiz im April 1801 und seinem Weggang nach Frankreich im Dezember dieses Jahres in Verbindung bringen. Für den in den untersuchten Handschriften häufigsten Tintentyp liegen datierbare Belege zwischen Januar 1803 und März 1804 vor, anzunehmen ist seine Verwendung zwischen Oktober 1802 und Juni 1804. Er dominiert auch im Homburger Folioheft. Eine vierte mehrfach vertretene Tinte gebraucht Hölderlin nach seiner Übersiedlung von Nürtingen nach Homburg. Sie findet sich im Folioheft und in einigen Einzelhandschriften.
Damit können die in der Forschung umstrittenen Fragen geklärt werden, a) ob dem Dichter das Homburger Folioheft bei seinem zweiten Aufenthalt in Homburg zur Verfügung stand und b) ob überhaupt Werkhandschriften aus dieser Zeit erhalten sind. Darüber hinaus lässt sich über die Röntgenfluoreszenzanalyse der Arbeitsstand in den untersuchten Manuskripten zum Zeitpunkt des Ortswechsels im Juni 1804 genau angeben. Auch Einzelbefunde singulärer oder in nur wenigen Stücken belegter Tinten geben gelegentlich Anhaltspunkte zur Datierung.
KW - Manuskript
KW - Röntgenfluoreszenzanalyse
KW - Eisengallustinte
PY - 2026
SN - 978-3-7705-7073-7
SN - 0340-6849
VL - 44
SP - 287
EP - 335
PB - Brill
CY - Paderborn
AN - OPUS4-65600
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Raab, A. R.
A1 - Grießler, T. R.
A1 - Rück, D.
A1 - Li, Z.
A1 - Zens, A.
A1 - Bruckner, J. R.
A1 - Huber, P.
A1 - Schönhals, Andreas
A1 - Szymoniak, Paulina
A1 - Laschat, S.
T1 - Salt complexation drives liquid crystalline selfassembly in crown ether–amino acid hybrids
N2 - Crown ether–amino acid hybrids represent a promising class of amphiphilic molecules combining ion recognition with self-assembly capabilities. Despite extensive studies on their binding properties, the influence of inorganic salt complexation on their liquid crystalline behaviour remains underexplored. Here we synthesized amphiphilic [18]-crown-6 derivatives of L-dihydroxyphenylalanine and tetrahydroisoquinoline analogues, systematically investigating the effects of alkyl chain length and salt type on mesophase formation. Complexation with various salts induced liquid crystalline phases, transitioning from smectic A to columnar hexagonal structures as anion size and alkyl chain length increased.
Structural analyses and electron density mapping revealed assembly into charged superdiscs forming columnar stacks with tunable ion channels. Broadband dielectric spectroscopy highlighted differences in molecular mobility and conductivity linked to molecular design. These findings establish salt complexation as a key strategy to control self-assembly and ion transport in crown ether–amino acid hybrids, advancing their potential in responsive soft materials and ion-conductive applications.
KW - Ionic liquid crystals
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655986
DO - https://doi.org/10.1039/d5tc04129e
SP - 1
EP - 18
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-65598
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Liu, Yuanbin
A1 - Zhou, Yuxing
A1 - Ademuwagun, Richard
A1 - Walterbos, Luc
A1 - George, Janine
A1 - Elliott, Stephen R.
A1 - Deringer, Volker L.
T1 - Medium-Range Structural Order in Amorphous Arsenic
N2 - Medium-range order (MRO) is a key structural feature of amorphous materials, but its origin and nature remain elusive. Here, we reveal the MRO in amorphous arsenic (a-As) using advanced atomistic simulations, based on machine-learned potentials derived using automated workflows. Our simulations accurately reproduce the experimental structure factor of a-As, especially the first sharp diffraction peak (FSDP), which is a signature of MRO. We compare and contrast the structure of a-As with that of its lighter homologue, red amorphous phosphorus (a-P): we find that a-As has a more uniform dihedral-angle distribution, and so we confirm that its structure can be thought of as a 3-fold coordinated continuous random network in first approximation, in contrast to the more molecular-cluster-like structure of a-P. The pressure-dependent structural behaviors of a-As and a-P differ as well, and the origin of the FSDP is closely correlated with the size and spatial distribution of voids in the amorphous networks. Our work provides fundamental insights into MRO in an amorphous elemental system, and more widely it illustrates the usefulness of automation for machine-learning-driven atomistic simulations.
KW - Machine Learned Interatomic Potentials
KW - Amorphous
KW - Advanced Materials
KW - Automation
KW - Digitalisation
KW - Structure-Property- Relationships
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655952
DO - https://doi.org/10.1021/jacs.5c18688
SN - 0002-7863
SP - 1
EP - 13
PB - American Chemical Society (ACS)
AN - OPUS4-65595
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Tuma, Dirk
A1 - Mady, A. H.
A1 - Baynosa, M. L.
A1 - Saad, M.
A1 - Dhakal, G.
A1 - Kim, W. K.
A1 - Shim, Jae-Jin
T1 - Morphology-engineered hollow NiTiO₃/C–Ag/Ag₃PO₄ S-scheme heterojunction photocatalyst: mechanistic insights into sunlight-driven tetracycline degradation
N2 - Tetracycline (TCH), a widely used antibiotic, persists in aquatic and terrestrial environments, posing ecological risks and accelerating antibiotic resistance. To address this, we report a hollow-structured NiTiO₃/C–Ag/Ag₃PO₄ (NT/C–AAP)
photocatalyst—the first hollow-type nickel titanate—synthesized via a self-template solvothermal route followed by photodeposition. The catalyst integrates key design strategies—hollow architecture, oxygen vacancies, carbon coating, and an S-scheme heterojunction—to optimize photocatalytic performance. The hollow structure enhances light harvesting via internal scattering, oxygen vacancies facilitate O2 adsorption and superoxide (O₂•⁻) generation, and the S-scheme heterojunction effectively suppresses electron–hole recombination while preserving strong redox potential. NT/C–AAP achieved 96% TCH degradation within 1 h and 82% mineralization in 3 h under solar light, far exceeding core–shell (18%) and aggregated (47%) NiTiO₃-based catalysts. Complete removal was realized within 40 min under 400 W visible light. The catalyst maintained 96% activity after five cycles, confirming excellent durability. Compared with previously reported NiTiO₃ photocatalysts, NT/C–AAP delivered a 50–400% performance enhancement arising from its engineered hollow structure and improved electronic properties. Mechanistic studies identified O₂•⁻ and •OH radicals as dominant species, validating the role of morphology and interface engineering in directing charge separation and redox activity. Additionally, a catalyst performance index was proposed to facilitate comparison across diverse conditions. Overall, this work introduces a novel, durable photocatalyst that links structural design to functional performance and demonstrates strong potential for practical environmental remediation.
KW - Heterojunction photocatalyst
KW - Photodegradation
KW - Tetracycline
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655946
DO - https://doi.org/10.1007/s42114-025-01600-x
SN - 2522-0128
VL - 9
IS - 2
SP - 1
EP - 19
PB - Springer Nature
CY - London
AN - OPUS4-65594
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Frechilla, A.
A1 - Martínez, E.
A1 - del Moral, J.
A1 - López-Santos, C.
A1 - Frechilla, J.
A1 - Nuñez-Gálvez, F.
A1 - López-Flores, V.
A1 - de la Fuente, G.F.
A1 - Hülagü, Deniz
A1 - Bonse, Jörn
A1 - González-Elipe, A.R.
A1 - Borrás, A.
A1 - Angurel, L.A.
T1 - Influence of near-edge Laser-Induced Periodic Surface Structures (LIPSS) on the electrical properties of fs-laser-machined ITO microcircuits
N2 - Scalable, cost-effective methods for processing transparent electrodes at the microscale are pivotal to advancing in electrochemistry, optoelectronics, microfluidics, and energy harvesting. In these fields, the precise fabrication of micrometric circuits and patterns plays a critical role in determining device performance, material compatibility, and integration with added-value substrates. In this context, Laser Subtractive Manufacturing stands out as a suitable microfabrication technique for its adaptability to diverse materials and complex configurations, as well as its straightforward scalability, affordability, and eco-friendly nature. However, a challenge in micromachining metals and metal oxides is the inherent formation of Laser-Induced Periodic Surface Structures (LIPSS), which can significantly impair electrical conductivity, particularly when circuit dimensions fall within the micrometer range. Herein, we investigate the micromachining of electrical microcircuits using ultrashort pulse laser systems applied to transparent indium tin oxide (ITO) thin films. We analyze the formation of LIPSS at the edges of the micromachined regions associated with the Gaussian distribution of the energy within the laser spot, and the impact of these structures on the electrical properties of the circuits. Thus, we systematically evaluate the influence of LIPSS orientation and periodicity by fabricating various circuit patterns using femtosecond lasers at green (515 nm) and ultraviolet (UV) (343 nm) wavelengths. A correlation between electrical resistivity measurements and microstructure analysis, as determined by field emission scanning electron and transmission electron microscopy, reveals distinct effects of the formed nanostructures depending on the laser source and its polarization. For the green wavelength, the edge side regions where LIPSS are oriented perpendicular to the ITO track exhibit a resistance higher by a factor just above two compared to those where LIPSS are parallel. Additionally, UV laser processing results in a pronounced reduction of ITO thickness at the boundary between the LIPSS region and the substrate. The mechanisms for the formation of LIPSS with both wavelengths are also discussed. Furthermore, we have determined that in narrow conductive tracks with a width ranging from 6 to 8 µm, the impact of LIPSS is particularly significant because the LIPSS structured region occupies a dominant fraction of the total width.
KW - ITO
KW - Laser-induced periodic surface structures (LIPSS)
KW - Laser subtractive manufacturing
KW - fs-laser processing
KW - Electrical properties
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655921
DO - https://doi.org/10.1016/j.apsusc.2026.166415
SN - 0169-4332
VL - 731
SP - 1
EP - 13
PB - Elsevier B.V.
AN - OPUS4-65592
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Baer, Wolfram
A1 - Ohm, Katrin
A1 - Holzwarth, Marcel
T1 - Statistische Auswertung der SE(B)-Bruchzähigkeitsdatenbasis und Untersuchungen zum Bruchmechanismus – neue Ergebnisse zur Untersuchung des Master Curve Konzepts für ferritisches Gusseisen mit Kugelgraphit bei dynamischer Beanspruchung (Projekt MCGUSS)
N2 - Die Zielstellung des laufenden Kooperationsprojektes MCGUSS zwischen der BAM Berlin und der MPA Stuttgart ist es, das probabilistische Master Curve (MC)-Konzept hinsichtlich seiner Übertragbarkeit auf ferritisches Gusseisen mit Kugelgraphit (DCI) zu untersuchen. Über Teilergebnisse der Arbeiten wurde bereits auf den Jahrestagungen 2023 bis 2025 des DVM-AK Bruchmechanik und Bauteilsicherheit berichtet. Der vorliegende Beitrag hat zwei Schwerpunkte.
Zum einen wurde die Datenbasis der dynamischen Bruchzähigkeit für SE(B)-Proben der Dicken 10 mm, 25 mm und 140 mm auf insgesamt 101 Versuche bei Temperaturen von -40 °C bis -140 °C erweitert, statistisch ausgewertet sowie MC-Analysen unterzogen. Die Ergebnisse zeigen, dass die Daten sich zwar mit einer Weibullverteilung gut beschreiben lassen, die MC-Methode nach ASTM E1921 jedoch nicht ohne Weiteres anwendbar ist, sondern Modifikationen erforderlich sind.
Des Weiteren werden neue Ergebnisse zum werkstoffspezifischen Bruchmechanismus bei dynamischer Belastung im unteren Übergangsbereich der Zähigkeit diskutiert. Die fraktographische Datenbank wurde durch REM-Analysen weiterer Bruchflächen von SE(B)25-Proben bei -40 °C, -60 °C und -80 °C ergänzt. Die Ergebnisse unterstreichen die prägende Rolle, die Rissarrestereignissen im Verlauf des dynamischen Sprödbruchversagens bei DCI zukommt. Der in MCGUSS zur Erklärung eines gegenüber Stahl inversen Probengrößeneinflusses vorgeschlagene Mechanismus „Specimen size-dependent arrest of local brittle fractures before global brittle failure by weakest link“ wird dadurch weiter unterstützt.
T2 - DVM-Jahrestagung 2026 des Arbeitskreises Bruchmechanik und Bauteilsicherheit
CY - Stuttgart, Germany
DA - 24.02.2026
KW - Statistics
KW - Dynamic fracture toughness
KW - Ductile cast iron
KW - Master curve
KW - Safety assessment
PY - 2026
SP - 1
EP - 12
PB - DVM-Verlag
CY - Berlin
AN - OPUS4-65591
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - RPRT
A1 - Schmidt, Wolfram
A1 - Dauda, Risikat Oladoyin
A1 - Reitz, Judith
A1 - Misselwitz, Philipp
A1 - Bassioni, Ghada
A1 - Olonade, Kolawole Adisa
A1 - van Damme, Henri
A1 - Marangu, Josep Mwiti
A1 - Dias Toledo Filho, Romildo
A1 - Stürwald, Simone
A1 - Schiewer, Gesine Leonore
A1 - Hanein, Theodore
A1 - Boru, Zamzam Bonaya
A1 - Christensen, Randi
A1 - Mack Vergara, Yazmin Lisbeth
A1 - Hoelzel, Fabienne
A1 - Apollo, Buregyeya
A1 - Kyarisiima, Hope
A1 - Thiedeitz, Mareike
A1 - Suraneni, Prannoy
A1 - Lorenz, Werner
A1 - Osmani, Mohamed
A1 - Lesutis, Gediminas
A1 - Hanhausen, Rosa
A1 - Lehmann, Steffen
A1 - Madundo, Mariam Marco
A1 - Bader, Vera Simone
A1 - Rashdi, Rabia
A1 - Landrou, Gnanli
A1 - Hafez, Hisham
A1 - Howe, Lindsay
A1 - Kamashanju, Kabibi Charles
A1 - Mohtashami, Nazanin
A1 - Opoku, Richard Addo
A1 - Erhahon-Nanna, Aisosa
A1 - Mellinghoff, Zanele
ED - Schmidt, Wolfram
ED - Kamashanju, Kabibi Charles
ED - Dauda, Risikat Oladoyin
ED - Reitz, Judith
ED - Misselwitz, Philipp
T1 - Renewable, low-carbon materials and (infra)structures for inclusive and equitable human habitat - A position paper derived from the ReLive Habitat Scoping Workshop in August 2025 at the Xplanatorium in Hannover
N2 - In order to create sustainable lifestyles and societies in the long term, sustainability goals must be balanced in terms of the environment, the economy and society. However, these targets are sometimes in conflict with each other and cannot be balanced without compromise. Today, the sustainability debate focuses primarily on balancing environmental/climate and economic targets. Social aspects tend to play a marginal role in the debate. This is also the case in the construction industry, which contributes significantly to global energy consumption and high grey and operational CO2 emissions worldwide. For this reason, research and politics have focused intensively in recent decades on ways to reduce climate emissions while maintaining economic efficiency.
Historically, the focus in construction has been on structural safety. The classic credo in engineering was ‘more is more’. In the context of the climate debate, however, ‘less is more’ often applies, so that engineers and architects today face an economic conflict of objectives between the classic requirements for failure probability and the requirements for sustainable, resource-saving construction, which calls for completely new, much more holistic approaches to material development and structural design. The aim here is to build in a way that is both economical and climate-friendly without compromising structural safety, which is already a complex undertaking.
However, the influence of the use of materials, architecture and construction technology on social aspects is often given much less consideration in the sustainability debate, even though enormous population growth and urbanisation processes are expected in the future, particularly in developing economic areas. This inevitably requires a stronger focus on the socio-economic aspects of construction, especially since, in contrast to many current metropolises, many conurbations in these regions will emerge in areas that are not yet densely populated. This provides freedom for innovative concepts that avoid the mistakes of the past and can consider all aspects of sustainability as largely equal. This freedom enables construction methods and urban concepts that use renewable, circular, local materials to create adaptable, accessible and liveable structures that are equitable, inclusive and fair for society.
This position paper deals with the socio-economic footprint of materials and buildings. It was compiled by an interdisciplinary group of international experts and attempts to develop approaches for effective socio-economic life cycle analysis using similar concepts to those used in environmental life cycle analysis of products and buildings. In contrast to economic analyses or environmental life cycle assessments, which can work with reasonably available and clearly defined units to develop indicators, it is often impossible to determine units for socio-economic indicators, data is more difficult to obtain and there is a lack of benchmarks.
During the discussions, a number of relevant parameters were developed, which can provide clearly quantifiable indicators for socio economic effects. These are related to largely available economic and employment data and consider the distribution of project contracts during implementation and the employment figures associated with project implementation. Particularly in the implementation of large-scale projects involving international investors and financial institutions, ‘(green) compliance value extractivism’ effects can occur, whereby partners from the donor countries are given preference over local project partners. This fraction of the loan flow directly abroad and can no longer serve the local economy to grow. This results in economic follow-up costs, even with lower project costs, which can promote social injustices. The higher the proportion of local companies and employees at engineering levels, the more fairly the construction project serves the local economy.
T2 - ReLive Habitat-Scoping-Workshop: Renewable, Low-carbon Materials and (Infra-)structures for Inclusive and Equitable Human Habitat
CY - Hannover, Germany
DA - 13.08.2025
KW - Socio-economic footprint
KW - Life cycle analysis
KW - Sustainability
KW - Urbanisation
KW - Low carbon materials
KW - Low carbon structures
KW - Human habitat
KW - Inclusiveness
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654742
DO - https://doi.org/10.26272/opus4-65474
VL - 2026
SP - i
EP - 24
PB - Bundesanstalt für Materialforschung und -prüfung (BAM)
CY - Berlin
AN - OPUS4-65474
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eddah, Mustapha
A1 - Markötter, Henning
A1 - Mieller, Björn
A1 - Widjaja, Martinus Putra
A1 - Beckmann, Jörg
A1 - Bruno, Giovanni
T1 - Multi-Energy High Dynamic Range (HDR) Synchrotron X-ray Computed Tomography applied to LTCC samples
N2 - Synchrotron X-ray computed tomography (SXCT) is regularly used in materials science to correlate structural properties with macroscopic properties and to optimize manufacturing processes. The X-ray beam energy must be adapted to the sample properties, such as size and density. If both strongly and weakly absorbing materials are present, the contrast to the weakly absorbing materials is lost, resulting in image artifacts and a poor signal-to-noise ratio (SNR). One example is a low-temperature co-fired ceramics (LTCC), in which metal connections are embedded in a ceramic matrix and form 3-dimensional conducting structures. This article describes a method of combining SXCT scans acquired at different beam energies, significantly reducing metal artifacts, and improving image quality. We show how to solve the difficult task of merging the scans at low and high beam energy. Our proposed merging approach achieves up to 35% improvement in SNR within ceramic regions adjacent to metallic conductors. In this way, previously inaccessible regions within the ceramic structure close to the metallic conductors are made accessible. The paper further discusses methodological requirements, limitations, and potential extensions of the presented multienergy SXCT merging technique.
T2 - iCT 2026
CY - Linz, Austria
DA - 10.02.2026
KW - Synchrotron x-ray CT
KW - Multi-energy CT
KW - Low-Temperature cofired ceramics
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655848
SP - 1
EP - 7
CY - e-Journal of Nondestructive Testing
AN - OPUS4-65584
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Zhou, Xuyang
A1 - Kumar, Sourabh
A1 - Chen, Xinren
A1 - Gault, Baptiste
A1 - Dehm, Gerhard
A1 - Hickel, Tilmann
A1 - Raabe, Dierk
T1 - Grain Boundary Transformation Induced by Boron Segregation
N2 - Boron enhances the hardenability of low-alloyed steel and reduces embrittlement at low temperatures, at parts-per-million concentration levels. Ist effectiveness arises from segregation to grain boundaries (GBs)-planar defects- between crystals-yet atomic-scale evidence remains limited.We addressed this gap by synthesizing GBs with controllable geometry and orientation, enabling reproducible comparison with and without boron segregation. Differential phase-contrast imaging directly reveals boron at iron GBs, and in-situ TEM heating (20 °C to 800 °C) allows us to track the dynamic evolution of GB structures. We found that boron segregation induces local structural changes and triggers GB phase transformations, as corroborated by calculated GB defect phase diagrams spanning broad ranges of carbon and boron content. Our findings not only bridge a gap in understanding the interplay between GB structure and chemistry but also lay the groundwork for targeted design and passivation strategies in steel, potentially transforming its resistance to hydrogen embrittlement, corrosion, and mechanical failure.
KW - Steel
KW - Defect Phases
KW - Grain Boundary
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655812
DO - https://doi.org/10.1038/s41467-025-62264-1
VL - 16
SP - 1
EP - 14
PB - Nature Communications
AN - OPUS4-65581
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Markötter, Henning
A1 - Sintschuk, Michael
A1 - Bruno, Giovanni
T1 - X-ray computed tomography scanning schemes and reconstruction capabilities at the BAMline (BESSY II)
N2 - The BAMline at the BESSY II synchrotron (Berlin, Germany) is a multipurpose beamline that is used for computed tomography, among other techniques. For more than 20 years it has been used in various scientific fields to access and analyze internal structural features such as porosity, cracks or delamination. The general trend of tomographic X-ray imaging is moving towards in situ and operando studies to access the above-mentioned features under the most realistic conditions. This article presents the X-ray computed tomography (XCT) capabilities and the software suite, such as live reconstruction available to imaging users. Direct XCT reconstruction plays an important role in the quality control of the performed experiments and is particularly crucial for in situ and operando experiments. The BAMline now offers a sequence-based step-scan XCT that enables preview reconstruction during the scan to gain early insight into the scanned sample even while the scan is in progress. In addition, the sequence-based scheme includes lateral shifts, thereby mitigating ring artifacts and improving image quality. Finally, since XCT scan parameters, such as sample–detector distance and beam energy, are of utmost importance, we devised calculation software allowing control of monochromators to set the desired beam spectrum.
KW - Synchrotron X-ray imaging
KW - Computed tomography
KW - Preview reconstruction
KW - CT scan scheme
KW - Software workflow
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655792
DO - https://doi.org/10.1107/S1600577526001177
SN - 1600-5775
VL - 33
SP - 543
EP - 550
AN - OPUS4-65579
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Semenova, Aleksandra
A1 - Spitzer Sra, Stefan H.
A1 - Dvorakova, Barbora
A1 - Askar, Enis
A1 - Funnemann, Patrick
A1 - Hermanns, Roy T.E.
A1 - Jankuj, Vojtech
A1 - Vignes, Alexis
A1 - Kuracina, Richard
A1 - Szabova, Zuzana
A1 - Norman, Frederik
A1 - Gabel, Dieter
A1 - Danzi, Enrico
A1 - Makarova, Ekaterina
A1 - Lorenzon, Ivan
A1 - Toman, Adrian
A1 - Adamus, Wojciech
A1 - Hessels, Conrad
T1 - Towards standardized safety protocols for iron-based energy carriers: International alignment through round robin testing on safety characteristics
N2 - Background Iron powder appears to be a promising solution for long-term energy storage and (inter-) continental transport, as it is safe to store and does not require energy to maintain its state, unlike, for instance, liquefied hydrogen. However, while the fundamental research is well underway, large-scale implementation is still in its early stages, with a growing number of promising demonstrators emerging. Methods This article contributes to the large-scale implementation of iron as an energy carrier by presenting a round-robin test of four iron powders currently used in research and larger-scale demonstrators. These powders were tested on their safety characteristics in the standard 20 L apparatus across eight European countries. Results The resulting data are intended to support future standardization efforts using different iron samples as standardized fuel. All tested powders were classified either as non-explosible or as belonging to the category of marginally explosible dusts (Class 1). This provides a clear picture of the level of explosion protection measures that need to be considered for the safe use of iron powders in energy carrier applications. Conclusions Along with that, the study detected variations in the results and pointed to shortcomings in the current standards that may cause such discrepancies. These findings emphasize the importance of improving testing procedures to support standardization and ensure the safe use of iron powder as an energy carrier using an a-priori-approach rather than subsequent testing.
KW - Explosion protection
KW - Energy carrier
KW - Safety characteristics
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655761
DO - https://doi.org/10.12688/openreseurope.22839.1
SN - 2732-5121
VL - 6
SP - 1
EP - 20
PB - F1000 Research Ltd
AN - OPUS4-65576
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Shaikh, Abdul Shaafi
A1 - Fardan, Ahmed
A1 - Mishurova, Tatiana
A1 - Hryha, Eduard
T1 - The Impact of High‐Productivity Processing on the Fatigue Failure of an Additive Manufactured Superalloy HAYNES 282
N2 - The elevated temperature low cycle fatigue life of additively manufactured HAYNES 282 superalloy from conventional 40 µm layer thickness process parameters was compared with that of high‐productivity 80 µm layer thickness process parameters. Wrought 282 alloy was also tested in parallel for comparison. The 40 µm process parameters produced fatigue life between 1400 and 1700 cycles to failure, the 80 µm process parameter specimens failed after ≈1200 cycles, and the wrought alloy reached 1350 cycles to failure. Microstructure investigations did not reveal systematic differences in phase constituents or grain structure between 40 and 80 µm processed 282 alloy. While both process parameters produced porosity of less than 0.05% by volume, high‐resolution X‐ray computed tomography showed the occurrence of large aspect ratio lack of fusion defects in the 80 µm material. These defects were also identified on fracture surfaces and could be related to the accelerated initiation and propagation of cracks, especially when oriented perpendicular to the load axis in samples built parallel to the building direction. The results emphasize the criticality of seemingly minor variations in defect characteristics on performance in cyclic loading conditions for high strength alloys.
KW - Additive manufacturing
KW - Laser powder bed fusion
KW - PBF-LB
KW - Fatigue
KW - EBSD
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655732
DO - https://doi.org/10.1002/adem.202502048
SN - 1438-1656
SP - 1
EP - 13
PB - Wiley-VCH GmbH
AN - OPUS4-65573
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Czeskleba, Denis
A1 - Rhode, Michael
A1 - Wandtke, Karsten
A1 - Irfan, Muhammad Dary
A1 - Kannengiesser, Thomas
T1 - Hydrogen diffusion in thick-walled S690 SAW joints: part 2 – predictive modeling of heat input and microstructure influence
N2 - High-strength low-alloy (HSLA) steels such as S690 are widely employed in thick-walled welded structures, where hydrogen-assisted cold cracking (HACC) remains a persistent concern. While microstructure-specific hydrogen diffusion coefficients (DH) for weld metal (WM), heat-affected zone (HAZ), and base material (BM) were experimentally established in Part 1 of this study, their quantitative influence on hydrogen accumulation and effusion has not yet been fully clarified. This work presents a transient, spatially resolved numerical model for simulating hydrogen transport in multi-pass submerged arc welds. The model integrates experimentally determined DH values with realistic thermal cycles and temperature-dependent boundary conditions. Developed in Python, the simulation tool is purpose-built for hydrogen diffusion in welded joints. It offers a focused, transparent alternative. It offers a focused, transparent alternative to general-purpose finite element platforms. Parametric analyses demonstrate that, although the diffusion coefficients vary by up to 50%, their impact on overall hydrogen retention is minor. In contrast, plate thickness, bead geometry, cooling time (t₈/₅), and interpass temperature exert a dominant influence on hydrogen distribution. Despite clear microstructural differences between the thermomechanically rolled (S690MC) and quenched and tempered (S690Q) variants, including opposite HAZ hardness responses (softening in S690MC, hardening in S690Q) in the (pen)ultimate weld bead, the simulations confirm that their diffusion behavior and hydrogen solubility are closely aligned. Consequently, differences in DH and solubility exert only a minor influence on hydrogen retention compared to thermal exposure and joint geometry. These findings support the interchangeable use of both steel grades in terms of HACC risk due to hydrogen diffusion kinetics under comparable welding conditions.
KW - Hydrogen assisted cracking
KW - Numerical simulation
KW - Diffusion
KW - Submerged arc welding
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655721
DO - https://doi.org/10.1007/s40194-026-02395-1
SN - 0043-2288
SP - 1
EP - 16
PB - Springer Science and Business Media LLC
AN - OPUS4-65572
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Schröder, Nina
T1 - Herausforderungen und Potenziale moderner Hochleistungs-Lichtbogenprozesse für effiziente Reparaturmaßnahmen an Altstahlkonstruktionen
N2 - Stahltragwerke, die im späten 19. und frühen 20. Jahrhundert errichtet wurden, stellen noch heute einen wesentlichen Bestandteil der technischen Infrastruktur dar. Ein erheblicher Anteil der Brücken- und Ingenieurbauwerke befindet sich seit mehr als 80 oder sogar 100 Jahren in Betrieb und ist kontinuierlich steigenden Verkehrsaufkommen, Achslasten sowie dynamischen Einwirkungen ausgesetzt. Vor dem Hintergrund dieser zunehmenden Beanspruchungen sind beanspruchungsgerechte und konstruktiv angemessene Instandsetzungsstrategien unerlässlich, um die langfristige strukturelle Integrität sicherzustellen und zugleich den vorhandenen Baubestand nachhaltig zu erhalten.
Da historische Stahlkonstruktionen überwiegend für genietete oder geschraubte Verbindungen ausgelegt wurden, stellt die nachträgliche Umsetzung geschweißter Reparatur- oder Verstärkungsmaßnahmen eine besondere Herausforderung dar. Neben den spezifischen werkstofflichen Eigenschaften alter Flussstähle sind insbesondere schweißbedingte Eigenspannungen sowie mikrostrukturelle Veränderungen zu berücksichtigen, da diese die Tragfähigkeit und das Gesamttragverhalten maßgeblich beeinflussen können. Infolgedessen müssen Instandsetzungskonzepte nicht nur die geometrische Wiederherstellung gewährleisten, sondern zugleich an den tatsächlichen Spannungszustand und die betrieblichen Beanspruchungen des Tragwerks angepasst werden.
Vor diesem Hintergrund untersucht die vorliegende Arbeit MAG-Schweißversuche an Mischverbindungen zwischen historischem und modernem Baustahl. Der Nahtöffnungswinkel wurde systematisch zwischen 50° und 30° variiert, um den Einfluss der Fugengeometrie auf das Schweißgutvolumen, die Wärmeeinbringung sowie den resultierenden Eigenspannungszustand zu analysieren. Darüber hinaus kamen innovative Hochleistungs-Lichtbogenprozesse, wie beispielsweise ein modifizierter Sprühlichtbogen, zum Einsatz, um eine kontrollierte und reduzierte Wärmeeinbringung zu ermöglichen. Ziel ist es, schweißbedingte Eigenspannungen durch eine Optimierung von Prozessführung und Fugengestaltung zu minimieren und damit eine technisch fundierte sowie beanspruchungsgerechte Instandsetzungsstrategie für bestehende historische Stahltragwerke mit langfristiger Gebrauchstauglichkeit bereitzustellen.
T2 - Forschungsseminar an der OvGU Magdeburg
CY - Magdeburg, Germany
DA - 18.02.2026
KW - Flussstahl
KW - Reparaturmaßnahmen
KW - Schweißeignung
KW - Modifizierter Sprühlichtbogen
KW - Eigenspannungen
PY - 2026
AN - OPUS4-65577
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Resch-Genger, Ute
T1 - How to get it right with photoluminescence measurements in the UV/VIS/NIR
N2 - Optical measurements of transparent solutions of organic dyes and semiconductor quantum dots and scattering materials such as luminescent nanocomposites and microparticles and phosphors dispersed in liquid and solid matrices play an important role in energy conversion, solid-state lighting, medical diagnostics, and security barcoding. A key performance parameter is the photoluminescence quantum yield QY, i.e., the number of emitted per number of absorbed photons. QY of transparent luminophore solutions can be obtained relative to a fluorescence QY standard of known QY. Such relative QY measurements require a calibrated spectrofluorometer. Here, we address typical sources of uncertainty for luminescence measurements and relative and absolute QY measurements from the instrument and material side and provide recommendations to circumvent or at least minimize them for transparent and scattering samples in the UV/vis/NIR/SWIR.
T2 - Workshop "Photoluminescence Spectroscopy and its application in Materials Research"
CY - Vienna, Austria
DA - 19.02.2026
KW - Quality assurance
KW - Reference material
KW - Fluorescence
KW - Dye
KW - Traceability
KW - Metrology
KW - Calibration
KW - Reference data
KW - Reference product
KW - Digital certificate
KW - NIR
KW - Instrument performance validation
PY - 2026
AN - OPUS4-65575
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Schilling, Markus
T1 - Digital Transformation in Materials Science: PMD Core Ontology (PMDco) 3.0 – Patterns & Applications
N2 - The digitalization of Materials Science and Engineering (MSE) demands standardized, interoperable approaches for representing complex experimental and simulation data. To address this challenge, the Platform MaterialDigital Core Ontology (PMDco) provides a mid-level semantic framework that bridges high-level ontologies and domain-specific terminologies. PMDco version 3.0, recently released, introduces significant enhancements based on a full alignment with the Basic Formal Ontology (BFO) as standardized in ISO/IEC 21838-2. This alignment ensures conceptual consistency and facilitates integration across heterogeneous data sources while enabling FAIR-compliant workflows.
First addressing the idea behind a mid-level ontology in MSE, this presentation emphasizes its role in harmonizing diverse data models and supporting machine-actionable knowledge representation. New features and design patterns introduced in PMDco 3.0 will be highlighted, which strengthen interoperability and provide reusable modeling structures for common MSE concepts. Practical applications and prototype implementations will be discussed.
PMDco has been developed through active community involvement and its future evolution relies on continued collaboration and discussion within the MSE community. Participation is strongly encouraged to ensure that PMDco remains relevant, comprehensive, and widely adopted. More information and opportunities to contribute can be found at materialdigital.de and github.com/materialdigital/core-ontology.
T2 - VMAP User Forum 2026
CY - Sankt Augustin, Germany
DA - 24.02.2026
KW - Semantic Technology
KW - Knowledge Graph
KW - PMD Core Ontology
KW - Semantic Pattern
KW - Machine-actionability
PY - 2026
AN - OPUS4-65574
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Ulbricht, Alexander
T1 - Do Microbes like Additively Manufactured Aluminium?
N2 - The use of laser-additively manufactured metallic components in the industrial sector is gaining traction, with the process now entering its application phase. Consequently, the materials are exposed to corrosive microbes, which this study examines in order to determine the implications of this exposure. Specifically, the study examines the exposure of laser powder bed fused AlSi10Mg (PBF-LB/AlSi10Mg) components to sulphate-reducing bacteria in an anaerobic environment. Is the specific PBF-LB microstructure a potential factor in determining or aiding biocorrosion?
A prismatic specimen was exposed to sulphate-reducing bacteria (SRB) for two weeks. The sample was scanned by X-ray computed tomography (XCT) before and after SRB exposure. The two data sets were registered to each other (using the internal void distribution as markers, due to the corrosion of the specimen’s surface) to enable the evaluation of the corrosion damage.
Virtual cuts of the 3D XCT reconstructions show a loss of volume and localised damage. The damage distribution aligns with the hatching pattern of laser exposure from laser powder bed fusion.
T2 - Konferenz iCT 2026
CY - Linz, Austria
DA - 10.02.2026
KW - Computed tomography
KW - Biokorrosion
KW - Additive manufacturing
KW - PBF-LB
KW - Laser powder bed fusion
KW - Sulphate-reducing bacteria
PY - 2026
AN - OPUS4-65570
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Czeskleba, Denis
A1 - Rhode, Michael
A1 - Wandtke, Karsten
A1 - Irfan, Muhammad Dary
A1 - Kannengiesser, Thomas
T1 - Hydrogen diffusion in thick-walled S690 saw joints: part 1—experimental determination of microstructure-dependent diffusion coefficients
N2 - High-strength low-alloyed steel S690 is widely used in heavy-duty applications, such as structural components, mobile cranes, and industrial plant construction, owing to their high strength and weldability. However, thick-plate submerged arc welding (SAW) can introduce elevated hydrogen levels and residual stresses that promote time-delayed hydrogen-assisted
cold cracking (HACC). Accurate, microstructure-specific diffusion data are scarce, limiting predictive HACC assessments. This study presents an experimental determination of hydrogen diffusion coefficients (DH) in two S690 variants: thermomechanically rolled (S690MC) and quenched and tempered (S690Q). Multi-layer SAW welds were produced from 30 mm thick plate material at three heat input levels, and diffusion membranes were extracted from weld metal (WM), heat-affected zone (HAZ), and base material (BM). Hydrogen permeation tests, conducted in accordance with DIN En ISO 17081, yielded flux curves normalized in time from which DH was derived using the inflection-point method. At room temperature, DH values ranged from 6 × 10−5 mm2/s to 9 × 10−5 mm2/s across all regions and heat inputs, with no significant difference between S690MC and S690Q. Weld metal exhibited marginally lower DH, attributed to enhanced hydrogen trapping, while base material measurements showed greater variability. These microstructure-resolved diffusion coefficients add quantitative data for modern S690 SAW welds and provide internally consistent input parameters for the numerical simulations presented in part 2. The results support improved parameterization for subsequent assessments of HACC risk through the optimization of welding parameters.
KW - Hydrogen assisted cracking
KW - Submerged arc welding
KW - Diffusion
KW - Electrochemical permeation
KW - Microstructure
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655711
DO - https://doi.org/10.1007/s40194-026-02400-7
SN - 0043-2288
SP - 1
EP - 15
PB - Springer Science and Business Media LLC
AN - OPUS4-65571
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Atila, Achraf
A1 - Bakhouch, Yasser
A1 - Xie, Zhuocheng
T1 - Revealing the void-size distribution of silica glass using persistent homology
N2 - Oxide glasses have proven to be useful across a wide range of technological applications. Nevertheless, their medium-range structure has remained elusive. Previous studies focused on ring statistics as a metric of the medium-range structure, but this metric provides an incomplete picture of the glassy structure. Here, we use atomistic simulations and state-of-the-art topological analysis tools, namely persistent homology (PH), to analyze the medium-range structure of the archetypal oxide glass (Silica) at ambient temperatures and with varying pressures. PH presents an unbiased definition of loops and voids, providing an advantage over other methods for studying the structure and topology of complex materials, such as glasses, across multiple length scales. We captured subtle topological transitions in medium-range order and cavity distributions, providing new insights into glass structure. Our work provides a robust way for extracting the void distribution of oxide glasses based on PH.
KW - Medium-range
KW - Voids
KW - Topology
KW - Silica glass
KW - Atomistic simulations
KW - Persistent homology
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655690
DO - https://doi.org/10.1016/j.mtla.2025.102613
VL - 44
SP - 1
EP - 11
PB - Elsevier Inc.
AN - OPUS4-65569
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Tiwari, Jitendar Kumar
A1 - Malladi, Bala
A1 - Mishurova, Tatiana
A1 - Fritsch, Tobias
A1 - Nyborg, Lars
A1 - Cao, Yu
T1 - Influence of contour parameters on the surface roughness of fine channels produced by powder bed fusion-laser beam
N2 - Surface roughness strongly influences the performance of fine internal channels in additively manufactured components. This study investigates how contour process parameters affect the surface finish of 1 mm-diameter channels produced by powder bed fusion–laser beam (PBF-LB). Five contour parameter sets with progressively increasing laser energy density (LED) were applied, while keeping infill parameters constant. Surface roughness was evaluated using surface profilometry, X-ray computed tomography (XCT), and optical microscopy (OM). Profilometry and OM provided localized measurements, whereas XCT captured full-channel roughness along the build direction. Results show that increasing LED initially reduces surface roughness due to improved melting and removal of partially fused particles, reaching optimal smoothness at an intermediate LED. Further LED increase causes roughness to rise again, attributed to balling and dross formation. Optical cross-sections depicted these trends, and XCT measurements closely matched profilometry data. The findings in this study highlight a trade-off between surface quality and dimensional accuracy, as higher LEDs improve smoothness but reduce channel diameter. This work establishes an optimal contour LED range for minimizing as-built surface roughness in fine internal channels, which can enhance the functional performance of PBF-LB components in aerospace, medical, and energy applications.
KW - Additive manufacturing
KW - PBF-LB
KW - Surface roughness
KW - Computed tomography
KW - Optical tomography
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655677
DO - https://doi.org/10.1016/j.vacuum.2026.115085
SN - 0042-207X
VL - 246
SP - 1
EP - 10
PB - Elsevier Ltd.
CY - Niederlande
AN - OPUS4-65567
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Gook, Sergej
A1 - Biegler, Max
A1 - Gumenyuk, Andrey
A1 - Rethmeier, Michael
T1 - Integration of hybrid laser-arc and narrow gap submerged arc welding for cost-effective joining of 80 mm thick S355ML steel plates
N2 - This paper presents the results of developing a cost-effective, robust process for welding thick steel plates. Welding trials were performed on S355ML structural steel plates with a thickness of 80 mm. A specially designed U-shaped joint preparation with a 45 mm root face was proposed to enable thick welds to be welded using a combined technique. In the developed process, a hybrid laser arc weld (HLAW) is performed as the first pass. Subsequently, narrow-gap submerged arc welding (NG-SAW) is applied to the opposite side using a multi-layer technique. The weld cross-section is completed using a reliable overlap of both the HLAW and NG-SAW welds. This method achieves a 2.9-fold reduction in weld volume and filler material consumption, as well as shorter production times for thick-walled welds. Further advantages of the process combination include eliminating the need to form the root of the HLAW weld and the absence of a backing support. The applied process parameters ensure that the maximum heat input does not exceed 5 kJ/mm, leading to uniform hardness across the weld metal and heat-affected zone (HAZ). Impact toughness testing at −40 °C demonstrated excellent performance, with Charpy V-notch energies of 138 ± 45 J in the arc-dominated region and 65 ± 12 J in the critical laser-dominated zone of the HLAW weld. In addition, the NG-SAW weld exhibited an average Charpy V-notch energy of 274 ± 5 J, confirming excellent low-temperature toughness of the fill passes. Owing to its high process stability and practical applicability, the proposed welding approach shows high potential for integration into the fabrication of thick-walled offshore constructions.
KW - Hybrid laser arc welding
KW - Narrow gap submerged arc welding
KW - Low carbon structural steel
KW - Fusion zone size
KW - Microstructure
KW - Impact absorbed energy
KW - Hardness
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655627
DO - https://doi.org/10.1016/j.optlastec.2026.114796
SN - 0030-3992
VL - 197
SP - 1
EP - 12
PB - Elsevier Ltd.
AN - OPUS4-65562
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kocherla, Amarteja
A1 - Duddi, Murali
A1 - Kolluru, Subramaniam
T1 - Embedded PZT sensors for combined viboacoustic sensing of concrete structures
N2 - Accurate assessment of damage in concrete structures requires monitoring techniques that can capture both global stiffness degradation and local cracking processes. Existing structural health monitoring approaches typically rely on separate sensors for vibration measurements and acoustic emission (AE) monitoring, while conventional surface-mounted devices often suffer from poor and variable coupling. This study presents an embedded piezoelectric (PZT) sensor developed for dual mode vibroacoustic monitoring in concrete structures.
The sensor is cast within the concrete matrix to improve mechanical coupling and enable robust measurement of structural response during damage evolution. Dual-mode monitoring is achieved through sequential operation of
the same embedded sensor in two distinct modes passive acoustic emission (AE) monitoring during fracture loading and impulse-excited vibration testing conducted before and after fracture test. Benchmarking experiments include comparison with commercial accelerometers and AE sensors, confirming that the embedded configuration enhances high-frequency sensitivity and coupling performance. The fracture process is interpreted by correlating AE activity with Digital Image Correlation (DIC)-based crack kinematics, enabling zone-wise understanding of crack development. The vibration response is interpreted using a stiffness-reduction framework consistent with hinge-type crack formation, explaining the observed modal-frequency reduction and in crease in damping. Electromechanical impedance measurements quantify sensor–matrix interaction, highlighting the role of epoxy-mediated impedance matching. Overall, the results demonstrate that the proposed embedded sensor provides a unified platform for validated AE-vibration sensing, offering a promising approach for integrated structural health monitoring of concrete infrastructure
KW - Vibroacoustic sensor
KW - Embedded PZT sensor
KW - Crack dynamics
KW - DIC
KW - Concrete
PY - 2026
DO - https://doi.org/10.1016/j.measurement.2026.120690
VL - 268
SP - 1
EP - 14
PB - Elsevier Ltd.
CY - Amsterdam, Netherlands
AN - OPUS4-65560
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Kaiser, Sebastian
T1 - Bestimmung des Temperaturfeldes beim Schweißen im Betrieb an Wasserstoff-Ferngasleitungen
N2 - Grüner Wasserstoff wird als zukünftiger Energieträger eine wichtige Rolle bei der Dekarbonisierung spielen. Sein großtechnischer Transport über große Entfernungen wird über ein Wasserstoff-Pipelinennetz erfolgen. Ein solches Netz erfordert regelmäßig Schweißarbeiten zu Reparatur-, Wartungs- oder Erweiterungszwecken. Im Erdgasnetz ist es gängige Praxis, Schweißarbeiten während des Betriebs auszuführen, da es technisch und wirtschaftlich äußerst schwierig ist, eine Pipeline außer Betrieb zu nehmen. Im Fall von Wasserstoffpipelines ist hierbei jedoch zu beachten, dass Wasserstoff in den Pipelinestahl absorbiert werden kann. Dies kann zu einer Beeinträchtigung der Materialeigenschaften oder sogar zum Versagen der Pipeline führen, da die bekannten Effekte der wasserstoffinduzierten Versprödung und der wasserstoffunterstützten Rissbildung auftreten können. Die Wasserstoffaufnahme ist dabei wesentlich von den beim Schweißen auftretenden erhöhten Temperaturen abhängig. Um genaue Kenntnisse der zu erwartenden Temperaturen zu erlangen, wurden Schweißversuche an Ersatzgeometrien durchgeführt und Temperaturverläufe an diesen gemessen.
Basierend auf den Temperaturmessungen sollen im weiteren Verlauf in Zusammenarbeit mit der TU Graz Temperaturfelder sowie die resultierende Wasserstoffaufnahme und -diffusion mittels FEM berechnet werden.
T2 - Forschungsseminar OvGU-Magdeburg
CY - Magdeburg, Germany
DA - 18.02.2026
KW - Pipeline
KW - Schweißen
KW - Wasserstoff
PY - 2026
AN - OPUS4-65565
LA - mul
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Palásti, Dávid Jenö
T1 - Utilizing modern fiber lasers for LIBS
N2 - The development of laser sources plays a very important role in the quick advancements in the field of LIBS. However, the development of fiber lasers went mostly unnoticed by the wider LIBS community. These laser sources, traditionally used in industrial cutting and welding processes, despite their high-power output (hundreds of watts) and are very robust nature, were neglected, because they used to work only in continuous mode. Modern fiber lasers however, offer pulsed output with a couple of mJ-s pulse energy, which can be adequate for certain tasks [1,2]. Furthermore, the pulse duration and the pulse repetition rate can be varied in a reasonably wide range, while their price is a fraction of the ones traditionally used in research.
In the recent years, our groups made experiences with modern fiber lasers to evaluate the feasibility of their usage in LIBS. The initial experiments proved that they are not just suitable for standard analytical tasks such as quantitative or qualitative analysis, but their unique set of features makes them capable for fundamental research, like no other laser sources currently on the market. The relatively low energy and elongated profile of the pulses are very efficient in ablation and in the generation of low temperature plasmas [3], which means the ionic lines are less numerous, while the emission is mostly free from the background emission typical for the early stages of the plasma lifetime. It can make spectrometer gating and signal integration much simpler and robust.
A thorough set of investigations of single pulse, double pulse and even continuous irradiation experiments was performed. The effects of various parameters, such as energy, duration and shape of the pulse as well as inter pulse delay were investigated on the generated signal focusing mainly the signal intensity, the self-absorption and the width of the peaks as well as the plasma properties.
T2 - EMSLIBS 2026
CY - Senlis, France
DA - 26.01.2026
KW - LIBS
KW - Fiber laser
PY - 2026
AN - OPUS4-65561
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Ebell, Gino
T1 - Neue Erkenntnisse zur Initiierung von Wasserstoffinduzierter Spannungsrisskorrosion an Brückenbauwerken und
N2 - Spannstahlbrücken die in der Vergangenheit mir vergüteten Spannstählen errichtet worden sind können unter ungünstigen Gegebenheiten bei deren Erstellung signifikante Probleme hinsichtlich der Tragfähigkeit bekommen. Im Speziellen kann die wasserstoffinduzierte Spannungsrisskorrosion hier bei der Errichtung der Brückenbauwerke Anrisse an den Spanndrähten erzeugt haben die Jahre später zum Versagen der Brücke führen können. Die Präsentation im Speziellen behandelt den Teileinsturz der Carolabrücke in Dresden.
T2 - LS Brandenburg Workshop
CY - Online meeting
DA - 20.02.2026
KW - Korrosion
KW - Spannungsrisskorrosion
KW - Spannstahl
KW - Wasserstoff
PY - 2026
AN - OPUS4-65552
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Denkler, Tilman
T1 - Der digitale Produktpass für Bauprodukte
N2 - Die Präsentation zeigt, dass der Digitale Produktpass (DPP) nach der neuen BauPVO (EU 2024/3110) eine maschinenlesbare, standardisierte Datensammlung zu Bauprodukten ist, verknüpft über eindeutige Kennungen/QR‑Codes, BIM‑kompatibel und eng mit dem DPP‑Rahmen der Ökodesign‑VO verzahnt; Ziele sind Digitalisierung, Transparenz, Re‑Use und effizientere Marktüberwachung/Zoll. Er adressiert Register/Webportal, Zugriffs‑ und Änderungsrechte für definierte Akteure und die Herstellerpflicht zur Bereitstellung inkl. Langzeitverfügbarkeit (≥ 10 Jahre); Ausnahmen gelten u. a. für Sonderanfertigungen und Erhaltung des kulturellen Erbes. Inhalte sind u. a. Leistungs‑ und Konformitätserklärung, Sicherheits‑ und Gebrauchsinformationen, technische Dokumentation, Nachhaltigkeitskennzeichnung und Verweise auf DPPs wesentlicher Bestandteile, basierend auf offenen, interoperablen Datenstandards und einem gemeinsamen Datenwörterbuch.
T2 - Online-Workshops zum DPP für Bauprodukte veranstaltet durch den Bundesverband Antriebs- und Steuerungstechnik. Tore e. V. (BAS.T)
CY - Online meeting
DA - 19.02.2026
KW - Digitaler Produktpass
KW - Bauproduktenverordnung
PY - 2026
AN - OPUS4-65547
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Hickel, Tilmann
A1 - Waske, Anja
A1 - Tehranchi, Ali
A1 - Bhattacharya, Biswajit
A1 - Stawski, Tomasz M.
A1 - Fellinger, Tim-Patrick
A1 - Mehmood, Asad
A1 - Witt, Julia
A1 - Ozcan, Ozlem
A1 - Guilherme Buzanich, Ana
A1 - Kumar, Sourabh
A1 - Mishra, Rajesh Kumar
A1 - Holzer, Marco
A1 - Stucchi de Camargo, Andrea Simone
A1 - Agudo Jácome, Leonardo
A1 - Manzoni, Anna
A1 - Fantin, Andrea
A1 - John, Elisabeth
A1 - Hodoroaba, Vasile-Dan
A1 - Bührig, Sophia
A1 - Murugan, Jegatheesan
A1 - Marschall, Niklas
A1 - George, Janine
A1 - Darvishi Kamachali, Reza
A1 - Maaß, Robert
A1 - Emmerling, Franziska
T1 - Chemically complex materials enable sustainable high-performance materials
N2 - Chemically complex materials (CCMats) including high-entropy alloys, oxides, and related multi-principal element systems offer a paradigm shift in materials design by leveraging chemical diversity to simultaneously optimize functional, structural, and sustainability criteria. The vastness of the compositional and structural space in CCMats propels the field into an expanding exploratory state. To reconcile functional and structural performance across this immense parameter space remains an open challenge. This Perspective evaluates the opportunities and challenges associated with harnessing chemical complexity across a broad spectrum of applications, such as hydrogen storage, ionic conductors, catalysis, magnetics, dielectrics, semiconductors, optical materials, and multifunctional structural systems. It is delineated how three central design strategies: targeted substitution (SUB), defect engineering (DEF), and diversity management (DIV) enable the reconciliation of high functional performance with long-term structural stability and environmental responsibility.
Advances in computational thermodynamics, microstructure simulations, machine learning, and multimodal characterization are accelerating the exploration and optimization of CCMats, while robust data infrastructures and automated synthesis workflows are emerging as essential tools for navigating their complex compositional space. By fostering cross-disciplinary knowledge transfer and embracing data-driven design, CCMats are poised to deliver next-generation materials solutions that address urgent technological, energy, and
environmental demands.
KW - Chemically complex materials
KW - Structural stability
KW - Functional performance
KW - Design strategies
KW - Sustainability
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655598
UR - https://www.sciencedirect.com/science/article/pii/S1359028626000033?via%3Dihub
DO - https://doi.org/10.1016/j.cossms.2026.101256
SN - 1359-0286
VL - 42
SP - 1
EP - 26
PB - Elsevier Ltd.
CY - Amsterdam
AN - OPUS4-65559
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Schwibbert, Karin
A1 - de Eulate Pérez, Elisa García
A1 - Wen, Keqing
A1 - Voss, Heike
A1 - Thiele, Dorothea
A1 - Richter, Anja M.
A1 - Bonse, Jörn
T1 - Escherichia coli repellence via laser-induced periodic surface structures (LIPSS) on titanium: Critical role of biofilm-associated gene expression
N2 - The inconsistency in the observed bacteria-repellent effects of laser-induced surface textures remains a subject of scientific debates. With E. coli TG1 as test strain, we performed biofilm formation assays on ultrashort pulse laser textured titanium. Samples covered with low spatial frequency LIPSS (LSFL) of periods around 750 nm or with high spatial frequency LIPSS (HSFL) featuring smaller periods around 100 nm were processed on polished samples. While LSFL significantly reduce the number of adhering bacteria compared to the polished reference, HSFL do not. Simultaneously, we concentrate our study on bacterial strategies employed for biofilm formation, that is the transcription of the biofilm-associated genes csgB, involved in primary adhesion to a surface, and wza, participating in biofilm maturation. Promoter regions of these genes were cloned into a promotor probe plasmid with the green fluorescent protein GFP+ as reporter and transferred into the test strain. As indicated by the fluorescence intensity of the reporter protein, among the bacteria colonizing LSFL-covered areas, a markedly higher proportion of cells transcribing csgB or wza were detected, compared to the bacterial populations colonizing the polished or HSFL-covered areas. To our knowledge, this is the first study indicating that the antifouling effect of LSFL topographies can be counteracted when bacteria activate biofilm-associated genes.
KW - Laser-induced periodic surface structures (LIPSS)
KW - Titanium
KW - Biofilm
KW - Antifouling
KW - Gene expression
KW - Fluorescence microscopy
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655572
DO - https://doi.org/10.1016/j.apsusc.2026.166363
SN - 0169-4332
VL - 730
SP - 1
EP - 9
PB - Elsevier B.V.
AN - OPUS4-65557
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Hernández-García, María Amparo
A1 - Rurack, Knut
A1 - Bell, Jérémy
T1 - Rapid fabrication of optical elements for sensing applications using a standard SLA printer
N2 - The demand for compact, high-performance optical components has driven the development of increasingly sophisticated and miniaturized optical elements, often requiring complex and costly fabrication methods. In this study, we propose a cost-effective and accessible methodology for the fabrication of lenses and free-form optics using a commercially available stereolithography (SLA) 3D printer. A systematic characterisation of six transparent photopolymer resins was conducted in terms of their spectroscopic, optical, and morphological properties, i.e., surface and dimensional properties. The evaluation encompassed parameters such as transmittance, autofluorescence, refractive index,
and surface roughness. A straightforward yet resilient printing and post-treatment protocol was formulated, facilitating the fabrication of optical components with over 80% transmittance, minimal intrinsic fluorescence, and surface quality that is compatible with exacting optical applications. The fabricated components demonstrated excellent dimensional fidelity to digital designs and high reproducibility. To demonstrate the versatility of this approach, aspherical, miniaturized, and freeform lenses were designed and integrated into three fluorogenic sensing systems, including oil (strip-based) and chlorine (microfluidic-based) detection platforms, as well as a smartphone-based SARS-CoV-2 biosensor. The integration of customized 3D-printed optics has been demonstrated to enhance signal collection and readout performance, thereby highlighting the potential of this approach to
democratize the rapid prototyping and deployment of miniaturized optical systems. This work
represents a significant advancement in the field of additive manufacturing, particularly in relation to the development of functional photonic devices. Furthermore, it opens new prospects for sensor applications in biosensing, microfluidics, imaging, and integrated optics.
KW - 3D-printing
KW - Free-form
KW - Prototyping
KW - Optical resin
KW - Surface finishing
KW - Fluorescence
KW - Sensor
PY - 2026
DO - https://doi.org/10.37188/lam.2026.024
VL - 7
SP - 1
EP - 19
PB - Light Publishing Group
CY - Changchun
AN - OPUS4-65555
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Prakash, Swayam
A1 - Bell, Jérémy
A1 - Rurack, Knut
T1 - Rapid Onsite Detection of Fecal Contamination in Water Using a Portable Fluorometric Assay
N2 - Fecal pollution in water poses significant health risks, especially when contaminated sources are used for drinking and food production. Traditional water quality testing methods are expensive, slow, and require skilled personnel, limiting their accessibility. This work addresses these issues by developing a portable fluorometric assay for the detection of the fecal indicator pigment urobilin (UB). The assay uses silane-functionalized glass fiber strips impregnated with zinc chloride, providing a ‘drop-&-detect’ approach with enhanced fluorescence response mediated by the unique complexation properties of ZnCl2 and UB. This approach allows for the detection of UB at sub-nanomolar concentrations in less than 1 min using a 3D-printed setup with miniaturized optical components powered by a smartphone with its camera as a detector. The results validated with a benchtop fluorometer show the effectiveness of this method. The successful application of this userfriendly, rapid, and sensitive assay to real water samples from three rivers and the influx and efflux of a wastewater treatment plant advances field-based water quality monitoring, meets the WHO’s ASSURED criteria, and supports progress toward the global clean water and sanitation goals.
KW - Fecal pigment
KW - Fluorescence
KW - Signal amplification
KW - Surface chemistry
KW - Water quality testing
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655543
DO - https://doi.org/10.1021/acssensors.5c03922
SN - 2379-3694
VL - 11
SP - 1
EP - 9
PB - American Chemical Society
CY - Washington, D.C.
AN - OPUS4-65554
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Shovo, Redoy Gazi
A1 - Thünemann, Andreas
A1 - Katcharava, Zviadi
A1 - Marinvo, Anja
A1 - Hoppe, Richard
A1 - Woltersdorf, Georg
A1 - Du, Mengxue
A1 - Androsch, Rene
A1 - de Souza e Silva, Juliana Martins
A1 - Busse, Karste
A1 - Binder, Wolfgang H.
T1 - Generating Tagged Micro- and Nanoparticles of Poly(ethylene furanoate) and Poly(ethylene terephthalate) as Reference Materials
N2 - Detecting nanoplastic particles in environmental samples and biological tissues remains a significant challenge, especially in view of newly emerging polymers, not yet commercially exploited. Fluorescent labeling provides a tagging strategy to overcome this limitation by reducing the detection limit of individual particles, especially for small-sized particles. We present a method for producing labeled nanoparticles (NP/MP) of poly(ethylene terephthalate) (PET) and poly(ethylene furanoate) (PEF), tagged with Alexa Fluor 633 or Alexa Fluor 647. Our preparations used mechanical grinding or solvent-based approaches (confined impinging jet mixing, ((CIJ, precipitation), generating particles with hydrodynamic diameters of 200–700 nm, displaying long-term stability in water of up to 57 days. Stable suspensions with concentrations of the particles ranging from 10 µg/mL (surfactant-free, by solvent mixing) to 5.88 mg/mL (precipitation, containing surfactant) were generated with zeta-potentials from −5 to −50 mV. Characterization of the nanoparticles by SEC, DSC, and XRD showed no significant changes in molecular weight, thermal behavior, or crystallinity via the solvent-based methods, compared to the pristine polymer, highlighting their suitability for producing standardized nanoparticle dispersions. Fluorescence spectroscopy of the Alexa-dye-labeled particles confirmed the successful incorporation of the Alexa dyes, so improving monitoring of their biological profiles of the PEF-MP/NPs. s-SNOM (near field imaging) could identify individual PEF-particles sized ∼200 nm by direct imaging.
KW - Reference Materials
KW - Nanoplastics
KW - Microplastics
KW - Polymer
KW - Fluorescence
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655531
DO - https://doi.org/10.1002/marc.202500839
SN - 1521-3927
VL - 47
IS - 4
SP - 1
EP - 11
PB - Wiley VHC-Verlag
CY - Weinheim
AN - OPUS4-65553
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Bär, J.
A1 - Kanna, N.K.
A1 - Duarte, Larissa
A1 - Madia, Mauro
T1 - Determination of the Kitagawa-Takahashi Diagram using DC Potential Drop Measurements
N2 - The Kitagawa-Takahashi Diagram is an important tool for describing the fatigue limit of components containing defects. The models used for its description differ, particularly in the transition region corresponding to the short crack regime. Therefore, for a reliable statement about the fatigue limit in this area, an experimental validation of the models is necessary. However, the standardized staircase method requires a large number of samples and has a long test duration. In this work, a method is presented that allows a simpler and faster validation of the Kitagawa-Takahashi Diagram in the region of short cracks. Rectangular notches with a defined width and depth were manufactured in flat samples of a low-alloyed steel with two different heat treatments using an engraving laser. This method allows a rapid production of very sharp notches without plastic deformation and with only a slight thermal influence on the surrounding material. The samples prepared in this way were fatigued with block wise increasing loads until failure. Cracks are detected by means of a Direct Current Potential Drop method. The length of the loading block (number of cycles) is determined by the measured potential drop. This procedure enables a reliable and precise determination of the limit stress for the respective notch size with low experimental effort and time consumption. The tests have
shown that in case of the normalized steel none of the models describes the determined values for the fatigue limit. For the hardened steel, the plot of the fatigue limit as a function of the Murakami parameter √area in combination with the El Haddad model allows a satisfactory description of the measured values.
T2 - 5th International Symposium on Fatigue Design and Material Defects
CY - Trento, Italy
DA - 14.05.2025
KW - Kitagawa-Takahashi diagram
KW - Damage tolerance
KW - Fatigue
KW - Potential drop
KW - Fracture mechanics
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655519
DO - https://doi.org/10.1016/j.prostr.2025.12.283
VL - 76
SP - 27
EP - 34
PB - Elsevier B.V.
AN - OPUS4-65551
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Engel, Philipp
A1 - Recknagel, Christoph
ED - Lienhart, Werner
T1 - SensoJointField - Umsetzung eines IoT-Netzwerkes für das Deformationsmonitoring hochbeanspruchter Betonfahrbahndecken
N2 - Fugen und deren dauerhafter abdichtender Verschluß sind sehr sensible Konstruktionselemente des Betonstraßenbaus. Um die Nutzungs- und Lebensdauer nachhaltig zu erhöhen, ist die Kenntnis der realen Beanspruchungen entscheidend. Um die Deformationsbeanspruchungen im Fugenbereich unter realen Nutzungsbedingungen aufzuklären, wurde durch die BAM ein innovatives Monitoringsystem "SensoJoint" entwickelt, welches Monitoringkampagnen autark im Feld realisieren kann. Konzeptionsansatz und die technische Realisierung dieses IoT-Sensornetzwerkes werden im Beitrag beschreiben.
T2 - Ingenieurvermessung 26
CY - Graz, Austria
DA - 10.02.2026
KW - Sensorik
KW - Infrastruktur
KW - Dauerhaftigkeit
KW - Performance
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655505
SN - 978-3-99161-070-0
DO - https://doi.org/10.3217/978-3-99161-070-0
VL - 1
SP - 184
EP - 193
PB - Verlag der Technischen Universität Graz
CY - Verlag der TU Graz, Technikerstraße 4, 8010 Graz
AN - OPUS4-65550
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Hajhariri, Aliasghar
A1 - Eberwein, Robert
T1 - Cryogenic storage system behaviour under fire
N2 - The transition from fossil fuels to low-emission alternatives is essential to mitigate carbon emissions in energy-intensive sectors. Liquid hydrogen (LH2) is a promising energy carrier due to its high gravimetric energy density, but its storage requires advanced insulation to minimize heat ingress and prevent excessive boil-off losses. Multilayer insulation (MLI), perlite, and microspheres are commonly used under vacuum conditions, yet their performance under fire exposure remains a critical concern.
This study investigates the thermal degradation of insulation materials and its impact on heat transfer in an event with extreme thermal load conditions using the Cryogenic High-Temperature Thermal Vacuum Chamber (CHTTVC). The heat flow dynamics are analyzed, and an equivalent heat transfer coefficient is proposed to quantify the impact of insulation deterioration as the outer wall temperature increases.
Additionally, a novel liquid-vapor interface monitoring method is introduced to improve real-time detection of phase changes within the tank. The results highlight that insulation failure substantially increases the heat flow, which, if not mitigated, can lead to boiling liquid expanding vapor explosions (BLEVE), jet fires, or catastrophic tank failure. The findings provide valuable insights into optimizing LH2 storage safety and improving emergency response strategies for cryogenic tanks exposed to extreme thermal conditions.
T2 - International Conference of Hydrogen Safety
CY - Seoul, Korea
DA - 23.09.2025
KW - Hydrogen Storages
KW - Liquid Hydrogen
KW - Fire safety
KW - Heat Transfer
PY - 2025
SN - 979-12-243-0274-2
SP - 1149
EP - 1160
AN - OPUS4-65546
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Falkenberg, Rainer
A1 - Kamachali, Reza Darvishi
T1 - Segregation-induced hydrogen embrittlement in titanium
N2 - Although titanium offers an optimal combination of strength, low weight, and toughness for various applications, it suffers from a drawback: loss of ductility upon exposure to hydrogen. In this work, we couple CALPHAD-integrated density-based thermodynamic modelling of hydrogen segregation with an experimentally calibrated fracture model to investigate its on crack propagation in titanium. Here we propose to model the crack propagation path as a quasi-interface with slightly opened structure and reduced atomic density, enabling interstitial hydrogen segregation. The atomic density is then directly linked with the damage parameter. We found that hydrogen segregation in titanium undergoes a significant transition such that above a threshold of only few atomic percent hydrogen in the solid solution, the interfacial hydrogen concentration exceeds 20 at.%. Integrating this information into our fracture model, the material damage evolution could be explained by a segregation-affected Griffith crack energy, resulting in material decohesion. We found that the segregation transition and subsequent embrittlement effects are critically sensitive to the temperature in the system. The present results suggest a mechanism underlying the sudden loss of fracture toughness during crack propagation, in relation to the ductile-to-brittle transition observed in titanium alloys exposed to hydrogen. The proposed CALPHAD-integrated chemo-mechanical framework can be further generalised for studying more complex failure mechanisms in various materials.
KW - Segregation transition
KW - Hydrogen embrittlement
KW - Titanium alloys
KW - Crack propagation
KW - Ductile-to-brittle transition
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655451
DO - https://doi.org/10.1016/j.mtla.2025.102411
SN - 2589-1529
VL - 41
SP - 1
EP - 12
PB - Elsevier Inc.
AN - OPUS4-65545
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Sauer, Hannah
A1 - Okpeke, Bright E.
A1 - Dzielendziak, Agnieszka S.
A1 - Eberwein, Robert
A1 - Baetcke, Lars
A1 - Ehlers, Sören
T1 - Comparative life cycle assessment of vacuum insulation panel core materials for liquid hydrogen storage tanks – glass bubbles compared to conventional core materials
N2 - The environmental performance of insulation materials for liquid hydrogen storage tank application is important to the development of sustainable supply chains. As new materials keep evolving, there is a need to assess their environmental impact. Therefore, this study investigates the environmental sustainability and circularity of cryogenic insulation concepts, namely vacuum insulation panels (VIPs), exclusively focussing on their core materials. Employing a cradle-to-grave life cycle assessment model, the VIP core materials are investigated with a special focus on glass bubbles. Based on the results, the global warming potential of the considered core materials, namely, glass bubbles, silica aerogel, fumed silica, expanded perlite, glass fibre, and polyurethane foam is 9.21∗10^−2, 7.00, 2.50∗10^−1, 3.63∗10^−2, 6.68∗10^−2, and 1.88 kg CO2 eq. per functional unit, respectively. In general, silica aerogel and polyurethane foam are the least environmentally friendly materials, while the most sustainable is expanded perlite, followed by glass fibre, glass bubbles, and fumed silica.
KW - LH2
KW - Insulation
KW - Cryogenic storage tank
KW - Life Cycle Assessment
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655445
DO - https://doi.org/10.1016/j.ijhydene.2026.153937
SN - 0360-3199
VL - 219
SP - 1
EP - 11
PB - Elsevier Ltd.
AN - OPUS4-65544
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Appel, Paul Alexander
A1 - Prinz, Carsten
A1 - Low, Jian Liang
A1 - Asres, Nahom Enkubahri
A1 - Wu, Shu-Han
A1 - Freytag, Annica
A1 - Krug von Nidda, Jonas
A1 - de Sousa Amadeu, Nader
A1 - Fellinger, Tim-Patrick
T1 - Core‐Shell: Resolving the Dilemma of Hard Carbon Anodes by Sealing Nanoporous Particles With Semi‐Permeable Coatings
N2 - A core-shell strategy is introduced to overcome the dilemma of common non-graphitic hard carbon anodes, linking high reversible storage capacity to practically unacceptable irreversible losses in the first cycle(s). Just as Graphite homogeneously combines effective lithium storage with an electrolyte solvent-sieving function, we show that both of these functions could be strategically integrated into non-graphitic carbons in a heterogeneous structure. Highly porous activated carbons are sealed by kinetically tuned gas-phase deposition of non-graphitic carbon to form a functional core-shell structure. Gas sorption porosimetry on core, shell, core–shell, and cracked core-shell particles confirms preserved core porosity and a semi-permeable shell. Diethyl carbonate sorption analysis is introduced as a more suitable probe than N2 or CO2 sorption, linking first-cycle losses to the liquid–solid interface of carbon anodes. The functional core-shell particles with much reduced diethyl carbonate uptake allow for high storage capacity and reduced first cycle losses. Delivering 400 ± 24 mAh g−1 with 82 ± 2% first-cycle reversibility, it is shown that three-stage Na storage in designed core-shell anodes can compensate for the larger size of sodium compared to lithium stored in graphite anodes (372 mAh g−1). The designed core-shell anodes show state-of-the-art performance with commercial promise.
KW - Sodium-ion battery
KW - Activated carbon
KW - Core-shell
KW - Hard carbon anode
KW - Diethyl carbonate vapor sorption
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655346
DO - https://doi.org/10.1002/anie.202519457
SN - 1433-7851
N1 - Es gibt eine parallele Sprachausgabe (deutsch), ein Link befindet sich im Feld zugehöriger Identifikator - There is a parallel language edition (German), a link is in the field related identifier
SP - 1
EP - 9
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-65534
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Appel, Paul Alexander
A1 - Prinz, Carsten
A1 - Low, Jian Liang
A1 - Asres, Nahom Enkubahri
A1 - Wu, Shu-Han
A1 - Freytag, Annica
A1 - Krug von Nidda, Jonas
A1 - de Sousa Amadeu, Nader
A1 - Fellinger, Tim-Patrick
T1 - Kern–Schale: Versiegelung nanoporöser Partikel mit semipermeablen Kohlenstoffschichten befreit Hartkohlenstoffanoden von ihrem Dilemma
N2 - In der vorliegenden Arbeit wird eine Kern-Schale-Strategie vorgestellt, die das grundlegende Problem gängiger nichtgraphitischer Hartkohlenstoff-Anoden adressiert: Hohe reversible Kapazitäten gehen bislang typischerweise mit erheblichen irreversiblen Verlusten in den ersten Zyklen einher. Analog zu Graphit, das sowohl Lithiumspeicherung als auch die Abtrennung von Elektrolytlösungsmitteln in einer homogenen Struktur vereint, zeigen wir, dass sich diese beiden Funktionen auch in nichtgraphitischen Kohlenstoffen gezielt in einer heterogenen Architektur kombinieren lassen. Hochporöse Aktivkohlen werden durch kinetisch kontrollierte Gasphasenabscheidung mit einer dünnen Schicht nichtgraphitischen Kohlenstoffs überzogen, sodass eine funktionale Kern-Schale-Struktur entsteht. Gasadsorptionsmessungen an Kern-, Schalen-, Kern-Schale- und mechanisch beschädigte Kern-Schale-Partikeln, bestätigen, dass die Porosität des Kerns erhalten bleibt und die Schale semipermeabel ist. Die Sorption von Diethylcarbonat wird als geeignetere Methode im Vergleich zu N2- oder CO2-Sorptionsmessungen eingeführt, um die irreversiblen Verluste des ersten Zyklus mit der tatsächlichen Flüssig-Fest-Grenzfläche von Kohlenstoffanoden zu verknüpfen. Die funktionalen Kern-Schale-Partikel zeigen eine stark reduzierte Aufnahme von Diethylcarbonat, was hohe reversible Kapazitäten bei deutlich geringeren Erstzyklusverlusten ermöglicht. Bei einer reversiblen Kapazität von 400 ± 24 mAh g−1 und einer initialen Coulombeffizienz von 82 ± 2% zeigt sich, dass die dreistufige Natriumspeicherung in der gezielt entwickelten Kern-Schale-Architektur den größeren Ionenradius von Natrium gegenüber Lithium (372 mAh g−1 in Graphit) kompensieren kann. Die entwickelten Kern-Schale-Anoden erreichen damit ein Leistungsniveau, das für eine kommerzielle Anwendung vielversprechend ist.
KW - Kern-Schale-Struktur
KW - Natriumionenbatterie
KW - Hartkohlenstoffanode
KW - Diethylcarbonatdampfsorption
KW - Aktivkohle
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655354
DO - https://doi.org/10.1002/ange.202519457
SN - 1521-3757
N1 - Es gibt eine parallele Sprachausgabe (englisch), ein Link befindet sich im Feld zugehöriger Identifikator - There is a parallel language edition (English), a link is in the field related identifier
SP - 1
EP - 10
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-65535
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Tiebe, Carlo
T1 - Advancing Traceability of Humidity Sensors for CO2-Based Applications Using Optical-Feedback Cavity-Enhanced Spectroscopy and Chilled Mirror Hygrometers
N2 - Advancing Traceability of Humidity Sensors for CO₂-Based Applications Using Optical Feedback Cavity Enhanced Spectroscopy and Chilled Dew Point Hygrometers
Content : The volume fraction of humidity in gaseous feedstocks, intermediates, products, and carrier gases plays a critical role in numerous industrial processes. Two emerging areas of application are particularly noteworthy. On the one hand, there is a strategic shift towards replacing fluorinated inert gases of gas-insulated switchgear systems, and on the other hand, cost-effective humidity measurements are gaining importance in the carbon capture and storage (CCUS) applications. The accuracy of applied sensor-based systems in these contexts must be assessed with respect to the specified threshold value of the application. However, the reliability and reproducibility of the reading have to be assessed to prevent errors. Generally, humidity measurement in gaseous carbon dioxide is feasible; however, the chemical reactivity of water with CO₂ can cause significant matrix effects. If the ITS-Sonntag equation is considered to be valid in carbon dioxide, chilled mirror hygrometers can be applied for reference measurements. Further, spectroscopic methods, like optical feedback cavity enhanced absorption spectroscopy (OFCEAS), can be applied, offering another robust reference method for determining humidity volume fractions. Here, we applied OFCEAS and a chilled mirror hygrometer for reference value determination. We verified the traceability of both instruments to our in-house gravimetric gas standards containing (100.69 ± 1.564) µmol/mol water in carbon dioxide. We further applied dynamic dilution with our in-house designed humidification unit to create sample gases that contained a volume fraction of (10 to 500) µmol/mol. In these gases, verified by OFCEAS and chilled mirror hygrometer, we conducted a measurement campaign to identify and characterize matrix effects on coulometric and capacitive sensors.
T2 - Gas Analysis 2026
CY - Paris, France
DA - 27.01.2026
KW - Hygrometry
KW - Humidity Sensor
KW - OF-CEAS
KW - Chilled Mirror
KW - Optical-Feedback Cavity-Enhanced Spectroscopy
PY - 2026
AN - OPUS4-65541
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Hajhariri, Aliasghar
A1 - Eberwein, Robert
A1 - Camplese, Davide
A1 - Scarponi, Giordano Emrys
A1 - Cozzani, Valerio
A1 - Seidlitz, Holger
T1 - Cryogenic storage safety: Experimental evaluation of insulation under extreme conditions
N2 - Hydrogen is recognized as a keystone of the global energy transition, offering a clean, high-energy-density energy carrier ideal for storage and transportation. Among various storage options, liquid hydrogen (LH2) is especially advantageous for both mobile and stationary applications. However, ensuring the safety and performance of LH2 storage systems under extreme thermal conditions, such as fire exposure, remains an engineering challenge.
This study introduces an experimental framework, called the Cryogenic High-Temperature Thermal Vacuum Chamber (CHTTVC), designed to investigate the thermal-hydraulic response of vacuum-insulated cryogenic tanks under fire-like conditions. The apparatus enables evaluation of insulation performance, such as perlite and multilayer insulation (MLI), with a focus on thermal degradation, heat ingress, and vacuum stability.
Results indicate that combustible MLIs undergo substantial thermal degradation, leading to heat ingress rates of up to 6.5 kW and the formation of hazardous combustion by-products. In contrast, non-combustible MLIs and bulk insulation materials restrict heat ingress to approximately 3 kW while more effectively preserving vacuum integrity. Combustible MLIs also exhibit pronounced pressure increases in the evacuated section, reaching ∼6 × 104 Pa, nearly six times higher than those observed for non-combustible counterparts. Analysis of effective emissivity further reveals an enhancement in radiative heat transfer, approximately five times, for combustible MLIs following degradation. Additionally, marked thermal stratification develops under both nominal and extreme heat loads, with temperature gradients approaching 10 °C per 100 mm during sustained thermal exposure.
KW - Multi-Layer Insulation
KW - Cryogenic Storage
KW - Safety
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655380
DO - https://doi.org/10.1016/j.jlp.2026.105961
SN - 0950-4230
VL - 101
SP - 1
EP - 20
PB - Elsevier Ltd.
AN - OPUS4-65538
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Wille, Frank
T1 - BAM-Testzentrum Wasserstoffsicherheit - Reallabore und Materialprüfung
N2 - Der Vortrag gibt einen kompakten Überblick über das BAM-Testzentrum Wasserstoffsicherheit und seine Rolle bei der Forschung, Prüfung und Entwicklung sicherheitsrelevanter Technologien entlang der gesamten Wasserstoff-Wertschöpfungskette. Das Kompetenzzentrum H2Safety@BAM vereint wissenschaftliche Expertise, einmalige Infrastruktur und praxisnahe Reallabore, um Vertrauen in Wasserstoff als zukünftigen Energieträger zu schaffen.
Im Mittelpunkt steht das Testgelände für Technische Sicherheit, das mit 12 km² zu den umfassendsten europäischen Einrichtungen für Sicherheitstests im Realmaßstab zählt. Dazu gehören eine Wasserstofftankstelle, Wasserstoffnetze im Reallabormaßstab, Prüfstände für Kryotechnik, Brand- und Explosionsversuche sowie eine im Bau befindliche Anlage zur Druckbehälterprüfung. Die Infrastruktur ermöglicht Freistrahlversuche, Jetflame-Tests sowie Untersuchungen für 1000-bar-Systeme.
Im Reallabor Wasserstoffnetze werden Materialien, Gasqualitäten, dynamische Strömungsszenarien und Komponenten unter realistischen und kritischen Bedingungen untersucht, um die sichere Integration von Wasserstoff in bestehende und neue Pipelineinfrastrukturen zu ermöglichen. Parallel dazu schafft das Reallabor Wasserstofftankstelle die Grundlage für neue digitale Methoden der Qualitätsinfrastruktur von Sensornetzwerken über Echtzeit-Datenerfassung bis zur Anlagenüberwachung. Ein Beispiel ist die Optimierung von Betankungsprozessen mittels Digital Twin, die eindrucksvoll demonstriert, wie die Sicherheit bei Schnellbetankungen aufgezeigt werden kann.
Mit Blick auf die Zukunft adressiert die BAM zudem die Sektorenkopplung. Datengetriebene Ansätze, KI und digitale Zwillinge sollen den sicheren und effizienten Betrieb von Elektrolyse, Energiespeichern und Wasserstoffanwendungen vernetzt unterstützen.
Insgesamt zeigt die Präsentation, dass die BAM eine zentrale Institution für die sichere Transformation hin zu einer Wasserstoffwirtschaft ist - mit exzellenter Infrastruktur, praxisnahen Reallaboren und tiefgreifender Forschungskompetenz.
T2 - Wasserstofftour durch die Regionen 2026
CY - Cottbus, Germany
DA - 11.02.2026
KW - Reallabor
KW - QI-Digital
KW - Materialprüfung
KW - Elektrolyse
KW - Wertschöpfungskette
KW - Testgelände
PY - 2026
AN - OPUS4-65537
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Erning, Johann Wilhelm
T1 - Werkstoffe im Kontakt mit Trinkwasser: Von den UBA-Bewertungsgrundlagen nach Europa
N2 - Die Grundlagen der hygienischen Bewertung von Werkstoffen im Kontakt mit Trinkwasser werden erläutert. Die regulatorischen Hintergründe und die Überführung der Regeln in den europäischen rahmen werden diskutiert und an Beispielen erläutert
T2 - Abschlusskonferenz ZEP-Fittings
CY - Lüdenscheid, Germany
DA - 05.02.2026
KW - Korrosion
KW - Trinkwasserhygiene
KW - Europa
KW - Werkstoffe
PY - 2026
AN - OPUS4-65536
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Nicolai, Marcel
T1 - Investigation of lamb wave mode repulsion with a spring-based model
N2 - Lamb waves are widely utilized in material characterization, non-destructive testing (NDT), and structural health monitoring (SHM). A unique feature of Lamb waves is mode repulsion, where dispersion curves approach each other but do not cross. This phenomenon is observed in both single and multilayer plates and is influenced by wave coupling. While mode repulsion in single plates has been linked to symmetry-breaking effects, its underlying mechanism in multilayer systems remains unclear. This study investigates mode repulsion in a coupled aluminum-polycarbonate plate system using a spring-based interface model. Dispersion curves are computed via the Scaled Boundary Finite Element Method, and time-domain simulations are used to analyze the interface dynamics. Results indicate that repulsion depends on interface stiffness, distinguishing between opening and closing repulsion regions. The study further reveals that mode repulsion corresponds to distinct oscillatory behaviors in the interface, where certain wave modes induce increased coupling spring elongation, leading to localized strain. A coupled harmonic oscillator model effectively explains opening repulsion regions but does not fully capture closing regions. Findings suggest that mode repulsion could be leveraged for non-destructive evaluation of adhesive interfaces, offering insights into bond strength characterization. This research contributes to a deeper understanding of wave interactions in multilayer structures and provides a theoretical foundation for advancing NDT and SHM techniques.
T2 - 2025 ICU PADERBORN - 9th International Congress on Ultrasonics
CY - Paderborn, Germany
DA - 21.09.2025
KW - Lamb waves
KW - Mode repulsion
KW - Coupled plates
KW - Elastic interface
KW - Dispersion curves
PY - 2025
AN - OPUS4-65531
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Chaudhuri, Somsubhro
A1 - Krankenhagen, Rainer
A1 - Lapšanská, Ivana
A1 - Stamm, Michael
T1 - Modeling Temperature Responses of a Wind Turbine Blade Section Under Climate Chamber Conditions – Part 1: Challenges for FEM Simulations
N2 - The rapid expansion of wind energy infrastructure over the past 20–30 years has led up to a situation where advanced non‐destructive testing (NDT) technologies are the need‐of‐the‐hour, not only for new wind turbine blades (WTBs) that are being installed, but also for older infrastructure which is reaching their designed lifetime. NDT technologies that improve both the quality as well as reduce the time required for the inspection are sought after, and one such example is passive infrared thermography (IRT). For passive IRT to provide significant information/insight into the integrity of the WTB, there needs to exist certain thermal contrast to both visualize and distinguish between features in WTB. These features could be surface features, subsurface structure or defects. The temperature variations due to air temperature fluctuations and the sun assist (passively) to obtain the necessary thermal contrast. To better understand the thermal response of composite structures such as WTBs, a validation study was conducted using a WTB section subjected to controlled temperature transients within a climate chamber, without external irradiation. Infrared measurements were recorded using a thermographic camera, and the same specimen was modeled using finite element methods (FEM) in COMSOL Multiphysics. While a direct validation of the simulation is limited due to transient and unmeasured variables in the experimental data, qualitative comparison provides valuable insight into the applicability of FEM for predicting thermal behavior in passive IRT scenarios. This article represents the first part of a two‐part study, focusing on the FEM modeling approach and associated challenges. The second part will address the experimental investigation in more detail, with an emphasis on thermal contrast behavior under varied transient conditions.
KW - Finite element modeling
KW - Non- destructive testing
KW - Passive infrared thermography
KW - Thermal contrast
KW - Wind turbine blades
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655330
DO - https://doi.org/10.1002/we.70102
SN - 1095-4244
VL - 29
IS - 3
SP - 1
EP - 14
PB - Wiley
AN - OPUS4-65533
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Redda, Zinnabu Tassew
A1 - Prinz, Carsten
A1 - Yimam, Abubeker
A1 - Barz, Mirko
A1 - Becker, Katharina
A1 - Gizaw, Desta Getachew
A1 - Laß-Seyoum, Asnakech
T1 - Structural and textural characterization of Brassica carinata biochar to investigate its potential industrial applications
N2 - Biochar, a low-cost, and carbon-rich product of the thermal decomposition of biomass under oxygen-limited conditions and at relatively low temperatures, has recently been identified as a promising porous material with a wide range of industrial applications. In the present study, a comprehensive analysis of proximate, ultimate, nutrient profile, structural, and textural properties of a biochar derived from two Ethiopian indigenous Brassica carinata cultivars was conducted. The characterization of the biochar was achieved by employing a variety of well-established methods, including proximate analysis (moisture, volatile matter, ash content, and fixed carbon), ultimate analysis (C, S, and O content), atomic oxygen to carbon ratio (O/C), morphological and elemental composition analysis through scanning electron microscopy coupled with energy-dispersive X-ray spectroscopy (SEM-EDS). Furthermore, a combination of mercury intrusion porosimetry (MIP), dynamic vapor sorption (DVS), and gas adsorption methods such as nitrogen and krypton gas adsorption, were used for an in-depth study of the porous structure. SEM morphological characterization showed that the biochar surfaces showed multiple pores of diverse sizes and shapes. EDS elemental composition analysis revealed that sodium, aluminium, and silicon were not detected, but potassium, calcium, magnesium, and iron were all present in noticeable amounts. Furthermore, ultimate analysis showed that the most prevalent elements were carbon (86 wt.%) and oxygen (10.41‒9.77 wt.%), while sulphur was present in negligible concentrations. MIP analysis demonstrated that the porosities of the biochars varied from 62.68 to 69.99 wt.%, with the Holetta-1 biochar showing the highest porosity. The superior porosity of Holetta-1, as confirmed via MIP analysis, yielded higher values for bulk volume (2.36 mL g− 1), skeletal volume (1.65 mL g− 1), and total intrusion volume (1.65 mL g− 1) compared to the Yellow Dodolla. The most frequent pore diameters were 172.46 μm for Yellow Dodolla and 111.42 μm for Holetta-1. The MIP log differential pore diameter distributions were observed to vary from 18 to 411 μm and 10 to 411 μm, respectively, for Yellow Dodolla and Holetta-1. Despite the biochars’ low specific surface areas (0.17–0.21 m² g⁻¹), krypton sorption was a suitable technique for its characterization compared to DVS and nitrogen sorption methods. In conclusion, the characterization studies confirmed that this carbon-rich porous material possesses unique and valuable properties, with these attributes position it as a promising alternative for diverse industrial applications, contributing to the development of a bio-based circular economy.
KW - Morphological characterization
KW - Mercury intrusion porosimetry
KW - Gas adsorption
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655325
DO - https://doi.org/10.1038/s41598-025-32063-1
SN - 2045-2322
VL - 16
IS - 1
SP - 1
EP - 19
PB - Springer Science and Business Media LLC
AN - OPUS4-65532
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Witte, Julien
A1 - Treutler, Kai
A1 - Schröpfer, Dirk
A1 - Kannengießer, Thomas
T1 - Influence of Microstructure on the Machinability and Surface Integrity of Additively Manufactured Iron Aluminides
N2 - The increasing global focus on energy and resource efficiency has stimulated a growing interest in additive manufacturing. AM offers economic advantages and enables an efficient use of materials. However, AM components often require subsequent mechanical post-processing, such as machining (e.g. milling), to achieve the final contours or surfaces. This is a particular challenge due to the heterogeneous and anisotropic nature of AM structures, which affect machining and the resulting component properties. High-performance materials such as iron aluminide represent a promising alternative to conventional high-temperature materials with a significant economic advantage. However, the strength and hardness properties, which are advantageous for applications in highly stressed lightweight components, pose a challenge for economical machining in addition to the AM microstructure properties. The difficult-to-cut material causes accelerated tool wear and insufficient surface quality. This study shows that crack-free additive manufacturing of the three-component system of iron-nickel-aluminum is possible, and advantages in terms of machinability compared to FeAl-AM components are achieved. The more homogeneous microstructure leads to a reduction in cutting forces, with positive effects on the machinability and optimized surface integrity. Ultrasonic assisted milling (USAM) offers great potential to address the major challenges posed by difficult-to-cut materials and additively manufactured weld structures. Therefore, this study focuses on assessing the transferability of previous positive results by USAM to the selected iron aluminide alloys. The machinability of the aluminides is analyzed by varying significant influencing variables in finish milling experiments and evaluated in terms of the loads on the tool and the resulting surface integrity.
T2 - AA Meeting of Commission IX ‘Behavior of Metals subject to Welding’
CY - Rhodes, Greece
DA - 08.07.2024
KW - Iron aluminide
KW - Additive manufacturing
KW - Machinability
KW - Surface integrity
KW - Ultrasonic-assisted milling
PY - 2026
SP - 1
EP - 16
AN - OPUS4-65530
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Rodricks, Carol Winnifred
A1 - Prockat, Annabell
A1 - Kalinka, Gerhard
A1 - Trappe, Volker
T1 - Novel Recyclable Hierarchical Carbon Fiber/Epoxy Composites: Preserving Fiber Length and Orientation Using Elium
N2 - Current recycling methods for polymer matrix composites produce short, unoriented carbon fibers, limiting their use to intermediate‐strength applications. A method is therefore needed to recycle fibers while preserving their original length and orientation, enabling a circular economy for carbon fiber composites. This study proposes a novel hierarchical composite designed to retain fiber length and orientation during recycling. Virgin carbon fibers are encased in an insoluble epoxy matrix to form tapes that act as the primary units of the structure. The primary tape matrix shields the fibers from chemical degradation while preserving their alignment throughout recycling. The tapes are then embedded in a secondary recyclable matrix, Elium, a thermoplastic polymer soluble in acetone with mechanical properties comparable to epoxy. The composite is recycled by dissolving the secondary Elium matrix in acetone and recovering the primary tape units with intact fiber length and orientation. The primary units can then be used to assemble new composites. In this study, hierarchical composite laminates underwent recycling up to three times. Their mechanical properties were assessed after each cycle. Laminates with an Elium secondary matrix retained 60%–90% of the mechanical performance of epoxy‐based laminates. Minimal degradation was observed between cycles, and fiber length, orientation, and volume fraction were fully preserved. Pushout tests confirmed that fibers in the primary tapes were sufficiently shielded during the recycling process. These results validate the feasibility of a hierarchical recyclable composite that combines recyclability with high mechanical performance, serving as a proof of concept and providing opportunities for future development.
KW - Review
KW - Interface
KW - Micromechanics
KW - Polymer matrix composites
KW - Glass fibre reinforced composites
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655276
DO - https://doi.org/10.1002/pc.70869
SN - 0272-8397
SP - 1
EP - 16
PB - Wiley Periodicals LLC.
AN - OPUS4-65527
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Pei, R.
A1 - Petrazoller, J.
A1 - Atila, Achraf
A1 - Arnoldi, S.
A1 - Xiao, L.
A1 - Liu, X.
A1 - Wang, H.
A1 - Korte-Kerzel, S.
A1 - Berbenni, S.
A1 - Richeton, T.
A1 - Guénolé, J.
A1 - Xie, Z.
A1 - Al-Samman, T.
T1 - Solute co-segregation mechanisms at low-angle grain boundaries in magnesium: A combined atomic-scale experimental and modeling study
N2 - Solute segregation at low-angle grain boundaries (LAGBs) critically affects the microstructure and mechanicalproperties of magnesium (Mg) alloys. In modern alloys containing multiple substitutional elements, understanding solute-solute interactions at microstructural defects becomes essential for alloy design. This study investigates the co-segregation mechanisms of calcium (Ca), zinc (Zn), and aluminum (Al) at a LAGB in a dilute Mg-0.23Al-1.00Zn-0.38Ca (AZX010) alloy by combining atomic-scale experimental and modeling techniques.Three-dimensional atom probe tomography (3D-APT) revealed significant segregation of Ca, Zn, and Al at the LAGB, with Ca forming linear segregation patterns along dislocation arrays characteristic of the LAGB. Clustering analysis showed increased Ca–Ca pairs at the boundary, indicating synergistic solute interactions.
Atomistic simulations and elastic dipole calculations demonstrated that larger Ca atoms prefer tensile regions around dislocations, while smaller Zn and Al atoms favor compressive areas. These simulations also found that Ca–Ca co-segregation near dislocation cores is energetically more favorable than other solute pairings, explaining the enhanced Ca clustering observed experimentally. Thermodynamic modeling incorporating calculated segregation energies and solute-solute interactions accurately predicted solute concentrations at the LAGB, aligning with experimental data. The findings emphasize the importance of solute interactionsat dislocation cores in Mg alloys, offering insights for improving mechanical performance through targeted alloying and grain boundary engineering.
KW - Atomic probe tomography
KW - Atomistic simulation
KW - Grain boundary
KW - Co-segregation
KW - Magnesium alloy
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655248
DO - https://doi.org/10.1016/j.actamat.2026.121947
SN - 1359-6454
VL - 306
SP - 1
EP - 13
PB - Elsevier Inc.
AN - OPUS4-65524
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dixneit, J.
A1 - Gibmeier, J.
A1 - Kromm, Arne
A1 - Schubnell, J.
A1 - Lang, F.
A1 - Loebich, F.
A1 - Carl, E.-R.
A1 - Ya, W.
T1 - Residual stress distribution of a large component manufactured by AM-DED-Arc from high-strength weld filler material X90
N2 - Currently, DED-Arc manufactured components are not covered by design guidelines, and design factors such as residual stress factors are not defined for such components. This hinders industrial use, especially for components with a remaining surface waviness required by industry. For the first time the stress state of a high-strength, low-alloy, large-scale DED-Arc component was characterised in the as-built state and after cutting off the component from the substrate plate. Complementary methods of residual stress analyses were applied to gain a holistic insight into the residual stress distributions of a thick-walled part. In the as-built state, direction-dependent and position-dependent tensile residual stresses were found for the component at the level of the yield strength of the part. The additive manufacturing strategy continuous spiral deposition has no significant influence on the residual stresses in bead threshold area compared to the residual stresses of the remaining component. For this case, bead threshold is no structural imperfection. By removing the part from the substrate plate, the residual stresses are significantly redistributed. Tensile residual stresses are then present at a moderate level. Compressive residual stresses were determined in the volume of the deposited material. The general consideration of ‘‘high’’ tensile residual stresses in such thick-walled components is rather conservative. Therefore, design guidelines should take the manufacturing condition into account.
KW - AM-DED-Arc
KW - Residual stress
KW - High strength steel
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655239
DO - https://doi.org/10.1177/03093247251406876
SN - 2041-3130
SP - 1
EP - 18
PB - SAGE
AN - OPUS4-65523
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Hertwig, Andreas
T1 - How can ellipsometry help us to understand ultrashort pulse laser material processing?
N2 - Laser processing of materials is a key technology in many fields of modern production. Still, more work is needed to understand the mechanisms behind laser material interaction. Recently, ellipsometry has become a valuable tool for investigating materials pre and post laser irradiation. Imaging ellipsometry and time-resolved methods boost this work and open up the path to a much better understanding of light interaction with solid state surfaces. We use spectroscopic single-spot and imaging ellipsometry to investigate treated and untreated surfaces. The goal is to determine changes in the material dielectric function, as well as geometric changes in surface layers (oxidation, modification, ablation, blistering). A good knowledge of bulk dielectric functions is often needed to model processes caused by laser irradiation. Imaging ellipsometry can play an important role in the post-analysis of laser treated sites on surfaces if combined with other methods such as IR-spectroscopy, SEM, topometric methods, Raman-spectroscopy, and XPS. In this work, we present the results of several studies to investigate laser-treated materials by means of ellipsometry. We cover the following topics:
• Ablation of amorphous carbon layers, role of intra-layer interference effects on the result
• Amorphisation behaviour of c-Si, depending on the crystal orientation,
• Understanding the role of bulk and surface properties on ablation behaviour of classical and
multicomponent high-entropy metals,
T2 - 13th Workshop on Spectroscopic Ellipsometry
CY - Genova, Italy
DA - 09.02.2026
KW - Ellipsometry
KW - Laser Ablation
KW - Femtosecond Technology
KW - Surface and Thin Layer Technology
KW - Laser Surface processing
PY - 2026
AN - OPUS4-65521
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - George, Janine
T1 - Robust Data Generation, Heuristics and Machine Learning for Materials Design
N2 - This talk first introduces students to the Materials Acceleration Platforms and Advanced Materials Characterization at BAM. Then, it motivates high-throuhgput screening for materials discovery and advanced materials simulations based on these core topics. Then four different research studies are presentend: evaluation of generative models, synthesizability prediction via PU learning, acceleration of materials property predictions with bonding analysis and advanced materials simulations supported by automatically trained machine learning potentials.
T2 - Guest Lecture in MSE 403/1003, a Seminar in the Curriculum of the University of Toronto
CY - Online meeting
DA - 13.02.2026
KW - Automation
KW - Materials Acceleration Platforms
KW - Machine Learning
KW - Workflows
KW - Phonons
KW - Bonding Analysis
KW - Thermal Conductivity
PY - 2026
AN - OPUS4-65514
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Holm, O.
T1 - Thermische Zerstörung von PFAS in der Sondermüllverbrennung: Einfluss von Temperatur und PFAS-Konzentration
N2 - Aufgrund ihrer einzigartigen molekularen Beschaffenheit werden per- und polyfluorierte Alkylsubstanzen (PFAS) in vielen unterschiedlichen Produkten und Anwendungsgebieten eingesetzt. Da sie generell eine hohe Persistenz aufweisen und je nach individueller Struktur unterschiedlich mobil sind, sind sie mittlerweile in allen Umweltkompartimenten und ubiquitär nachzuweisen. Ihre potenzielle (ökologische) Toxizität birgt dabei erhebliche Umweltrisiken, weshalb PFAS in den letzten Jahren mehr und mehr in den Fokus von Umweltverbänden und -behörden gelangten. Gleichzeitig beschäftigen sich Forschungseinrichtungen mit der möglichst weitreichenden Entfernung aus der Umwelt sowie mit deren (anschließender) Zerstörung.
Im Projekt ER24-4073 „Untersuchung des thermischen Abbaus von PFAS in einer kommerziellen Großanlage zur Verbrennung gefährlicher Abfälle“, welches vom U.S. Department of Defense (DoD ) über das Strategic Environmental Research and Development Program (SERDP) gefördert wird, untersuchen deutsche, australische und amerikanische Partner die Behandlung von PFAS-haltigen Abfallströmen in einer großtechnischen Verbrennungsanlage, um die Einsatzbereitschaft, Machbarkeit und Sicherheit dieser Zerstörungsmethode zu demonstrieren.
T2 - Berliner Konferenz Abfallwirtschaft und Energie (BKAWE)
CY - Berlin, Germany
DA - 28.01.2026
KW - Per- and polyfluoroalkyl substances (PFAS)
KW - Verbrennung
KW - Kontaminierter Boden
PY - 2026
AN - OPUS4-65512
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GOVDOC
A1 - Adam, Christian
A1 - Wöhlecke, Andreas
T1 - 9. Nachtrag zum Zulassungsschein 12/BAM IV.3/09/00 für eine Schutzschicht bestehend aus einer sandgefüllten Schutzbahn für Kunststoffdichtungsbahnen in Deponieabdichtungen
N2 - 9. Nachtrag zum Zulassungsschein 12/BAM IV.3/09/00 für eine Schutzschicht bestehend aus einer sandgefüllten Schutzbahn für Kunststoffdichtungsbahnen in Deponieabdichtungen der Firma G quadrat GmbH, Krefeld.
KW - Deponie
KW - Schutzschicht
KW - Abdichtungssystem
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654339
SP - 1
EP - 31
PB - Bundesanstalt für Materialforschung und -prüfung (BAM)
CY - Berlin
AN - OPUS4-65433
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Rastgou, Masoud
A1 - Hülagü, Deniz
A1 - Danilenko, Aleksandr
A1 - Manoocheri, Farshid
A1 - Hertwig, Andreas
A1 - Ikonen, Erkki
T1 - Comparison of thin-film thickness measurements using ellipsometry and reflectometry with uniform samples
N2 - This study evaluates spectroscopic ellipsometry and reflectometry using high-quality SiO2 and Al2O3 thin-films on Si substrates, thereby facilitating a detailed assessment of consistency of measurement results and uncertainty analyses. The results with detailed uncertainty budgets indicate good agreement between the two methods across a broad layer thickness range from 10 nm to 2000 nm, with deviations remaining well within the measurement uncertainties. Ellipsometry results have lower uncertainty than reflectometry results especially with the thinner layers, whereas reflectometry uncertainties are lower with the thickest layers studied. This work underscores the importance of rigorous thickness characterization and reliable uncertainty evaluation as critical factors in advancing both modeling and measurement practices in thin-film metrology.
KW - Ellipsometry
KW - Reflectometry
KW - Thin Film Metrology
KW - Measurement Accuracy
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655209
DO - https://doi.org/10.1088/1681-7575/ae3964
SN - 0026-1394
VL - 63
IS - 1
SP - 1
EP - 14
PB - IOP Publishing
CY - Bristol, UK
AN - OPUS4-65520
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bernardy, Christopher
A1 - Habib, Abdel Karim
A1 - zur Nedden, Philipp Maximilian
A1 - von Saldern, Jakob Georg Raimund
A1 - Beuth, Jan Paul
A1 - Orchini, Alessandro
T1 - Thermal Radiation Of Inclined Large Scale Hydrogen Jet Flames
N2 - In order to assess the thermal radiation emanating from hydrogen jet flames, experiments under real scale conditions were carried out at the Test Site Technical Safety of BAM. Herein, the behavior of inclined hydrogen jet flames was investigated. The aim of the work is to determine the Surface Emissive Power (SEP) and radiant heat fraction of these flames and to provide a reliable dataset for model evaluation purposes. Since the aforementioned values are not directly measurable, the incident heat radiation was measured at defined distances from the flame, as well as the flame’s shape and size. The required values were then derived from these measurements. The hydrogen releases ranged from 0.0125 kg/s to 0.175 kg/s with a 30 mm orifice. The mass flows were held constant during the releases, nevertheless a transient behavior of the flame could be observed since the experiments were carried out under open field conditions, with unsteady wind fields. In the literature, the flame lengths are often determined using visible light imaging, either by injecting coloring substances in the low light emitting hydrogen jet flame or by carrying out the measurements in darkness. In this work the jet flames were visualized using infrared (IR) and OH* imaging. The recorded flame shapes and resulting flame lengths are compared. Results from this showed that the flame lengths determined with OH* and IR recordings differ greatly. A flame length ratio lf OH*/lf IR in the range of 0.47–0.62 can be found. In addition, the SEP differ also in the range of 10 kW/m2–16 kW/m2 (IR) and 40 kW/m2–80 kW/m2 (OH*) for hydrogen jet flames due to differences in the determined flame surface. Conclusions regarding the determined xRAD values for IR and OH* result in approximately the same range of 0.031–0.043.
T2 - 11th Iinternational conference on hydrogen safety 2025
CY - Seoul, Republic of Korea
DA - 22.09.2025
KW - Hydrogen safety
KW - Jet flames
KW - Thermal radiation
KW - Large scale experiment
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655181
DO - https://doi.org/10.58895/hysafe.27
SN - 2943-5935
VL - 3
IS - 1
SP - 39
EP - 50
PB - Karlsruhe Institute of Technology Library
AN - OPUS4-65518
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Krause, Christina
A1 - Szymoniak, Paulina
A1 - Lohstroh, W.
A1 - Juranyi, F.
A1 - Zamponi, M.
A1 - Frick, B.
A1 - Al-Sabbagh, Dominik
A1 - Emmerling, Franziska
A1 - Zorn, R.
A1 - Schönhals, Andreas
T1 - Complex molecular dynamics of symmetric model discotic liquid crystals: Comparison of Hexakis(hepta-alkanoyloxy)triphenylene (HOT6) with Hexakis(hexa-alkyloxy)triphenylene (HAT6)
N2 - This study investigates the complex molecular dynamics of discotic liquid crystals (DLCs) by comparing two structurally similar compounds: Hexakis(hepta-alkanoyloxy)triphenylene (HOT6) and Hexakis(hexa-alkyloxy)triphenylene (HAT6) having the same triphenyl core and the same length of the alkyl side chain. The difference of both materials is that the alkyl chain is linked by an oxygen bridge to the triphenylene core for HAT6 and by a ester group for HOT6. Using a combination of broadband dielectric spectroscopy, differential scanning calorimetry, X-ray scattering, and neutron scattering techniques, the research explores the glass transition phenomena and relaxation processes in these materials. HOT6, featuring ester linkages, exhibits distinct dynamic behavior compared to HAT6, including two separate glass transitions indicated by the 1- and 2-relaxation found by dielectric spectroscopy which are assigned to the glassy dynamics of the alkyl side chain in the intercolumnar space and that of the columns, respectively. The study reveals that the ester group in HOT6 leads to increased molecular rigidity and altered packing in the intercolumnar space, as evidenced by X-ray scattering and the vibrational density of states. Neutron scattering confirms localized methyl group rotations and a further relaxation process which relates to the -relaxation revealed by dielectric spectroscopy. The findings contribute to a deeper understanding of glassy dynamics in partially ordered systems and highlight the influence of molecular architecture on relaxation behavior in DLCs.
KW - Discotic Liquid Crystals
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655171
DO - https://doi.org/10.1039/d5sm01247c
SN - 1744-6848
SP - 1
EP - 17
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-65517
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - INPR
A1 - Naik, Aakash A.
A1 - Dhamrait, Nidal
A1 - Ueltzen, Katharina
A1 - Ertural, Christina
A1 - Benner, Philipp
A1 - Rignanese, Gian-Marco
A1 - George, Janine
T1 - A critical assessment of bonding descriptors for predicting materials properties
N2 - Most machine learning models for materials science rely on descriptors based on materials compositions and structures, even though the chemical bond has been proven to be a valuable concept for predicting materials properties. Over the years, various theoretical frameworks have been developed to characterize bonding in solid-state materials. However, integrating bonding information from these frameworks into machine learning pipelines at scale has been limited by the lack of a systematically generated and validated database. Recent advances in high-throughput bonding analysis workflows have addressed this issue, and our previously computed Quantum-Chemical Bonding Database for Solid-State Materials was extended to include approximately 13,000 materials. This database is then used to derive a new set of quantum-chemical bonding descriptors. A systematic assessment is performed using statistical significance tests to evaluate how the inclusion of these descriptors influences the performance of machine-learning models that otherwise rely solely on structure- and composition-derived features. Models are built to predict elastic, vibrational, and thermodynamic properties typically associated with chemical bonding in materials. The results demonstrate that incorporating quantum-chemical bonding descriptors not only improves predictive performance but also helps identify intuitive expressions for
properties such as the projected force constant and lattice thermal conductivity via symbolic regression.
KW - Bonding Analysis
KW - Machine Learning
KW - Symbolic Regression
KW - Chemical Understanding
KW - Phonons
KW - Thermal Conductivity
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655150
DO - https://doi.org/10.48550/arXiv.2602.12109
SP - 1
EP - 28
PB - Cornell University
CY - Ithaca, NY
AN - OPUS4-65515
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Holm, O.
A1 - Leube, Peter
A1 - Vogel, Christian
A1 - Kennedy, E.
A1 - Stockenhuber, M.
A1 - Lucas, J.
A1 - Truong, T.
A1 - Rappé, A.
A1 - Lu, W.
A1 - Blotevogel, J.
T1 - Thermische Zerstörung von PFAS in der Sondermüllverbrennung: Einfluss von Temperatur und PFAS-Konzentration
N2 - Aufgrund ihrer einzigartigen molekularen Beschaffenheit werden per- und polyfluorierte Alkylsubstanzen (PFAS) in vielen unterschiedlichen Produkten und Anwendungsgebieten eingesetzt. Da sie generell eine hohe Persistenz aufweisen und je nach individueller Struktur unterschiedlich mobil sind, sind sie mittlerweile in allen Umweltkompartimenten und ubiquitär nachzuweisen. Ihre potenzielle (ökologische) Toxizität birgt dabei erhebliche Umweltrisiken, weshalb PFAS in den letzten Jahren mehr und mehr in den Fokus von Umweltverbänden und -behörden gelangten. Gleichzeitig beschäftigen sich Forschungseinrichtungen mit der möglichst weitreichenden Entfernung aus der Umwelt sowie mit deren (anschließender) Zerstörung.
Im Projekt ER24-4073 „Untersuchung des thermischen Abbaus von PFAS in einer kommerziellen Großanlage zur Verbrennung gefährlicher Abfälle“, welches vom U.S. Department of Defense (DoD ) über das Strategic Environmental Research and Development Program (SERDP) gefördert wird, untersuchen deutsche, australische und amerikanische Partner die Behandlung von PFAS-haltigen Abfallströmen in einer großtechnischen Verbrennungsanlage, um die Einsatzbereitschaft, Machbarkeit und Sicherheit dieser Zerstörungsmethode zu demonstrieren.
T2 - Berliner Konferenz Abfallwirtschaft und Energie
CY - Berlin, Germany
DA - 28.01.2026
KW - Per- and polyfluoroalkyl substances (PFAS)
KW - Verbrennung
KW - Kontaminierter Boden
PY - 2026
SN - 978-3-911006-65-1
SP - 66
EP - 77
PB - TK Verlag
AN - OPUS4-65513
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Rodriguez, Santiago
A1 - Kumanski, Sylvain
A1 - Ayed, Zeineb
A1 - Fournet, Aurélie
A1 - Bouanchaud, Charlène
A1 - Sagar, Amin
A1 - Allemand, Frédéric
A1 - Baulin, Vladimir A.
A1 - Resch‐Genger, Ute
A1 - Cortés, Juan
A1 - Sibille, Nathalie
A1 - Chirot, Fabien
A1 - Wegner, Karl David
A1 - Antoine, Rodolphe
A1 - Le Guével, Xavier
A1 - Bernadó, Pau
T1 - Programming the Optoelectronic Properties of Atomically Precise Gold Nanoclusters Using the Conformational Landscape of Intrinsically Disordered Proteins
N2 - The rational design of hybrid nanomaterials with precisely controlled properties remains a central challenge in materials science. While atomically precise gold nanoclusters (Au‐NCs) offer molecule‐like control over a metallic core, tuning their optoelectronic behavior via surface engineering is often empirically driven. Here, we establish a design principle by demonstrating that the conformational landscape of intrinsically disordered proteins (IDP) can be used as a programmable scaffold to rationally modulate the photophysical properties of a covalently bound Au‐NC. We synthesized a series of bioconjugates between Au 25 nanoclusters and bioengineered IDPs containing a variable number of cysteine anchoring points. A combination of mass spectrometry, small‐angle X‐ray scattering, and modeling on the conjugates indicates that increasing the number of covalent anchors systematically restricts the conformational ensemble, inducing a progressively more compact protein shell around nanoclusters. This structural rigidification at the interface directly translates into a 15‐fold enhancement of the Au‐NC near‐infrared photoluminescence and a six‐fold increase in its average lifetime. Our findings demonstrate that the conformational plasticity of IDPs and the capacity to engineer them can be harnessed as a molecular tuning knob, moving to a new regime of programmable soft‐matter control over the properties of quantum‐confined nanomaterials for tailored biotechnological applications.
KW - Fluorescence
KW - Custer
KW - Nano
KW - Advanced material
KW - Characterization
KW - Fluorescence quantum yield
KW - Integrating sphere spectroscopy
KW - Thiol ligands
KW - Gold
KW - Surface chemistry
KW - SWIR
KW - Mass spectrometry
KW - Protein
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655086
DO - https://doi.org/10.1002/chem.202502991
SN - 0947-6539
SP - 1
EP - 9
PB - Wiley VHC-Verlag
AN - OPUS4-65508
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Gaal, Mate
A1 - Álvarez-Arenas, Tomás Gómez
T1 - Guest Editorial: Special Section on Air-Coupled Ultrasound
N2 - Air-coupled ultrasound is a challenging field dominated by the drastic impedance mismatch between air and all condensed matter, the low ultrasound velocity in the air, and the rapidly increasing attenuation with frequency.
The seven articles included in this special section showcase the diversity of current research on air-coupled ultrasound. All contributions in this special section are application-oriented, demonstrating the readiness of air-coupled ultrasound technologies to address real-world challenges. Whether it’s ensuring food safety, supporting heritage conservation, optimizing industrial inspection, or enabling in-field biological measurements, the practical relevance of these studies makes this section
particularly valuable for both researchers and industry professionals.
KW - Air-coupled ultrasound
KW - Transducers
KW - Non-destructive testing
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655041
DO - https://doi.org/10.1109/OJUFFC.2026.3656857
SN - 2694-0884
VL - 6
SP - 1
EP - 2
PB - Institute of Electrical and Electronics Engineers (IEEE)
AN - OPUS4-65504
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Casali, Lucia
A1 - Carta, Maria
A1 - Michalchuk, Adam
A1 - Delogu, Francesco
A1 - Emmerling, Franziska
T1 - Correction: Kinetics of the mechanically induced ibuprofen–nicotinamide co-crystal formation by in situ X-ray diffraction
N2 - Correction for ‘Kinetics of the mechanically induced ibuprofen–nicotinamide co-crystal formation by in situ X-ray diffraction’ by Lucia Casali et al., Phys. Chem. Chem. Phys., 2024, 26, 22041–22048, https://doi.org/10.1039/D4CP01457J.
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-656362
DO - https://doi.org/10.1039/d6cp90028c
SN - 1463-9076
VL - 28
IS - 8
SP - 5587
PB - Royal Society of Chemistry (RSC)
CY - Cambridge
AN - OPUS4-65636
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Engel, Philipp
A1 - Recknagel, Christoph
T1 - SensoJointField - Umsetzung eines IoT-Netzwerkes für das Deformationsmonitoring
N2 - Eine wissenschaftliche Weiterentwicklung der Betonbauweise im Rahmen des „performance concepts“ erfordert die Kenntnis der maßgebenden Beanspruchungen/Einwirkungen und deren Auswirkungen in modernen Betonfahrbahnkonstruktionen. Zur direkten Erfassung verkehrsbedingter und witterungsbedingter Deformationen von hochbeanspruchten Betonfahrbahnbelägen im Fugenbereich wurde ein innovativer Sensor „SensoJoint“ durch die BAM entwickelt. Für praxisnahe Untersuchungen wurden die Sensoren zusammen mit weiterer innovativer Sensorik zur direkten Verkehrslasterfassung in das neuartige Monitoringsystem „SensoJointField“ integriert. Der Vortrag beschreibt die technische Umsetzung des Monitoringsystems innerhalb eines autarken IoT-Netzwerkes für die unmittelbare freie Anwendung im Feld des Bundesfernstraßenbereiches.
T2 - 321. Internationaler Ingenieurvermessungskurs (D-A-CH) an der TU Graz
CY - Graz, Austria
DA - 11.02.2026
KW - Hochbeanspruchte Infrastruktur
KW - Beton-Fahrbahnbeläge
KW - Qunatifizierung
KW - Qualifizierung
KW - Nutzungsbeanspruchung
PY - 2026
AN - OPUS4-65511
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Cerny, Alain
T1 - Engineering Activated Carbon via Chemical Vapor Deposition for High-Performance Core-Shell Carbon Anodes in Sodium-Ion Batteries
N2 - Rising demand for sustainable energy storage has renewed interest in sodium-ion batteries (SIBs) as alternative to lithium-ion batteries. Although hard carbon and related materials are common SIB-anodes, the correlation between its structure and ion storage mechanism remains unclear.[1] As shown recently, the pore design is essential to block the formation of excessive solid electrolyte interphase (SEI) and allows the formation of pseudo-metallic clusters inside the pores.[2,3] Adjusting the diameter of the pore entrance, enables a reversible low-potential plateau (< 0.1 V), which significantly enhances the capacity (potentially up to 450-500 mAh/g) compared to graphite (Qtheo = 372 mAh/g) in Li-ion batteries.[2]
Activated carbon (AC) is a low-cost material with abundant micropores and high surface area, making it a promising anode candidate for SIBs. However, its performance is often hindered by structural disorder and excessive SEI-formation. Hence, mitigating active-species loss is essential to achieve high specific capacities (> 300 mAh g-1).[3] The aim herein was to investigate the relationship between the properties of the AC and the CVD-conditions required to achieve an efficient SIB-anode.
This study introduces an optimized chemical vapor deposition (CVD) method to modify various, highly porous commercial ACs aiming towards core-shell carbons, consisting of a porous core and a non-graphitic CVD-shell.[3] The ACs were treated via CVD and characterized using a range of techniques including gas physisorption, small-angle x-ray scattering and X-ray diffraction. The electrochemical properties of the different materials, prior and after CVD-coating, were analysed in half cells vs. Na-metal.
After coating, gas physisorption confirmed a significantly lower surface area for the materials. Depending on the porosity of the material, a longer CVD-time was necessary to fully coat the particles. The successful formation of core-shell carbons enables separation of the storage mechanism from SEI-formation. The CVD-process enables precise control over the microstructure of the carbon material, allowing to enhance the reversible Na-storage capacity, e.g., from 107 mAh g-1 to 353 mAh g-1 while significantly reducing initial Coulombic losses by 73%.
The greatly increased low-potential capacity verifies the formation of an electrolyte-tight CVD shell enabling Na-storage in the porosity of the core. The established link between porosity, CVD-parameters, and performance guides optimization for future materials.
T2 - Batterieforum 2026
CY - Berlin, Germany
DA - 20.01.2026
KW - Sodium-Ion Battery
KW - Carbon
KW - Chemical Vapour Deposition
PY - 2026
AN - OPUS4-65510
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Plarre, Rudy
T1 - Wirksamkeitsbewertung von Holzschutzmitteln
N2 - Der Holzschutz in Deutschland ist durch DIN 68800 geregelt. Die Anwendung von Holzschutzmitteln zum Schutz verbauten Holzes ist dabei eine Möglichkeit. Voraussetzung für den Gebrauch von Holzschutzmitteln ist deren Zulassung nach Biozidgesetz. Der Vortrag beschreibt die Vorgehensweise bei der Wirksamkeitsbewertung von Holzschutzmitteln im Rahmen der europäischen Biozidzulassung. Die Wirksamkeitsbewertung erfolgt durch biologische Prüfungen anhand von europäischen Normen getrennt nach Zielorganismen. Je nach späterer Gebrauchssituation des mit Holzschutzmitteln behandelten Holzes sind definierte Alterungsverfahren nach Norm der eigentlichen biologischen Prüfung vorzuschalten. Das Prüfergebnis des widerstandsfähigsten Organismus legt die zum Schutz des Holzes notwenige Konzentration und Einbringmenge des Holzschutzmittel fest.
T2 - Fortbildung für Angehörige von Bundesbehörden organsiert durch die BAuA
CY - Online meeting
DA - 12.02.2026
KW - Holzschutzmittel
KW - Wirksamkei
KW - Biozidgesetz
PY - 2026
AN - OPUS4-65507
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Bayat, Mehmet E.
A1 - Huber, C.
A1 - Kipphardt, Heinrich
A1 - Tiebe, Carlo
A1 - Engelhard, Carsten
T1 - Towards a sensor-based methodology to determine online calorific values of H2-enriched natural gases in the grid
N2 - The German National Hydrogen Strategy (NWS) envisions a transition towards a hydrogen-based energy grid. However, due to the material incompatibility of existing pipeline infrastructure for amounts of hydrogen higher than 10 cmol/mol, many system components of the existing grid must be replaced with significant costs and considerable time investments. Given these constraints, the admixture of hydrogen into natural gas (NG) to create a hydrogen-enriched NG blend has been designated as a transitional technology. The NWS supports this approach on a regional and time-limited basis, but clearly states that it is not intended as a permanent solution.
Nevertheless, the conversion to a fully hydrogen-based grid is expected to take several decades. During this transitional phase, precise process analytical monitoring of hydrogen amounts in the NG blend is essential to ensure both energy efficiency via calorific value control and operational safety. These procedures require cost-effective, robust, and reliable sensor technologies capable of real-time, in situ/on-site quantification of hydrogen amounts in NG.
In response to this need, we have advanced a physical sensing approach utilizing an oscillating cantilever in collaboration with Truedyne Sensor AG. This sensor system enables quantification of hydrogen amounts, direct calorific value determination as well as display of beneficial gas properties, like density, viscosity, and thermal conductivity. Moreover, the enhanced cantilever system enables direct physical sensing and can also be operated in a quasi-binary mode.
We performed comparative evaluations against two benchmark sensor systems to validate the developed technology. One utilizes chemical sensing, and the other operates on thermal conductivity measurements for hydrogen quantification. Through standardized testing, we demonstrated that the cantilever-based sensor offers both high effectiveness and competitive performance compared to current state-of-the-art technologies for accurate hydrogen detection in natural gas and precise determination of its calorific value.
T2 - Gas Analysis 2026
CY - Paris, France
DA - 27.01.2026
KW - Hydrogen
KW - Natural Gas
KW - Sensor
KW - Calorific Value
KW - Grid
PY - 2026
AN - OPUS4-65505
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Stohl, Leonie
A1 - Tonon, Chiara
A1 - Cook, Jake
A1 - Gorbushina, Anna
A1 - Dehn, Frank
A1 - von Werder, Julia
A1 - Manninger, Tanja
T1 - Understanding bioreceptivity of concrete: material design and characterization
N2 - The climate crisis is driving an increasing demand for ecologically oriented concepts. In the building sector, this demand includes not only the use of environmentally friendly materials but also the greening of urban areas. One promising approach is the development of bioreceptive concrete façades, which support the growth of green biofilms directly on their surfaces. These innovative façades are anticipated to deliver benefits comparable to those of macroscopically greened façades, such as enhanced biodiversity and improved air quality, while offering the advantages of being more self-sustaining and stable systems once fully established.
However, the development of bioreceptive concrete presents substantial challenges. Due to the interdisciplinarity and novelty of this field, standardized methods for material characterization and bioreceptivity assessment are currently lacking. This study proposes an approach for evaluating surface properties crucial for bioreceptivity, developed on differently structured samples of ultra-high-performance concrete (UHPC). Existing methods and standards from concrete technology are critically reviewed and, where necessary, modified to meet the unique requirements of measuring bioreceptive material properties. Special attention is given to the surface pH value and water retention characteristics, as these are essential for promoting microbial growth and ensuring the long-term stability of green biofilms. The observed surface characteristics vary according to the imprinted surface structures, offering a spectrum of material properties and enabling the evaluation of their impact on bioreceptivity. The findings presented form the foundation for subsequent laboratory weathering experiments, which will be discussed in a complementary publication.
KW - Novel methods
KW - Bioreceptivity testing
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655023
DO - https://doi.org/10.1617/s11527-025-02863-y
SN - 1359-5997
VL - 58
SP - 1
EP - 18
PB - Springer Science and Business Media LLC
AN - OPUS4-65502
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Gerrits, Ruben
A1 - Stepec, Biwen An
A1 - Bäßler, Ralph
A1 - Becker, Roland
A1 - Dimper, Matthias
A1 - Feldmann, Ines
A1 - Goff, Kira L.
A1 - Günster, Jens
A1 - Hofmann, Andrea
A1 - Hesse, René
A1 - Kirstein, Sarah
A1 - Klein, Ulrich
A1 - Mauch, Tatjana
A1 - Neumann-Schaal, Meina
A1 - Özcan Sandikcioglu, Özlem
A1 - Taylor, Nicole M.
A1 - Schumacher, Julia
A1 - Shen, Yin
A1 - Strehlau, Heike
A1 - Weise, Matthias
A1 - Wolf, Jacqueline
A1 - Yurkov, Andrey
A1 - Gieg, Lisa M.
A1 - Gorbushina, Anna
T1 - A 30-year-old diesel tank: Fungal-dominated biofilms cause local corrosion of galvanised steel
N2 - The increased use of biodiesel is expected to lead to more microbial corrosion, fouling and fuel degradation issues. In this context, we have analysed the metal, fuel and microbiology of a fouled diesel tank which had been in service for over 30 years. The fuel itself, a B7 biodiesel blend, was not degraded, and—although no free water phase was visible—contained a water content of ~60 ppm. The microbial community was dominated by the fungus Amorphotheca resinae, which formed thick, patchy biofilms on the tank bottom and walls. The tank sheets, composed of galvanised carbon steel, were locally corroded underneath the biofilms, up to a depth of a third of the sheet thickness. On the biofilm-free surfaces, Zn coatings could still be observed. Taken together, A. resinae was shown to thrive in these water-poor conditions, likely enhancing corrosion through the removal of the protective Zn coatings.
KW - Fungal biofilms
KW - Biodiesel degradation mechanisms
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655014
DO - https://doi.org/10.1038/s41529-025-00731-2
SN - 2397-2106
VL - 10
IS - 1
SP - 1
EP - 14
PB - Springer Science and Business Media LLC
AN - OPUS4-65501
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Gaal, Mate
A1 - Wernicke, Pascal
T1 - Improved air-coupled ultrasonic transmission using pulse compression
N2 - Air-coupled ultrasonic testing avoids contamination and reduces maintenance costs, but suffers from poor signal-to-noise ratio (SNR) due to impedance mismatch. Rather than developing new transducers, this study improves SNR through signal processing by adapting pulse compression from radar.We propose a method using unipolar square pulses to make pulse compression compatible with non-linear transducers such as ferroelectrets and thermoacoustic emitters. Instead of relying on analytical models, a reference transmission measurement served as the matched filter, simplifying implementation and ensuring adaptability across transducer types. We evaluated unipolar coded excitation and pulse compression on ultrasonic transmission through a 25mm polyvinyl chloride plate, varying code length and pulse delay. Significant SNR gains were observed across transducers, particularly with longer delays. These results confirm that pulse compression enhances peak localization and supports testing under low-SNR conditions.
Further experiments showed that pulse compression remains effective despite side lobe overlap and noise, provided the pulse delay is chosen appropriately. Although SNR prediction is limited by electrical and acoustic interference, the method consistently improves detection. Overall, the results demonstrate the feasibility of unipolar excitation coding for pulse compression in air-coupled ultrasonic testing, with practical value for thick or attenuating materials.
KW - Air-coupled ultrasound
KW - Coded excitation
KW - Pulse compression
KW - Transducers
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-655005
DO - https://doi.org/10.1109/OJUFFC.2026.3659047
SN - 2694-0884
VL - 6
SP - 9
EP - 16
PB - Institute of Electrical and Electronics Engineers (IEEE)
AN - OPUS4-65500
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Rashidi, Reza
A1 - Vaerst, Olivia
A1 - Riechers, Birte
A1 - Rösner, Harald
A1 - Wilde, Gerhard
A1 - Maaß, Robert
T1 - Atomic-scale strain fluctuations as an origin for elastic microstructures in metallic glasses
N2 - Metallic glasses (MGs) exhibit an elastic microstructure that spans from a few to hundreds of nanometers, the origin of which continues to remain poorly understood. Here we employ four-dimensional scanning transmission electron microscopy (4D-STEM) on a Zr65Cu25Al10 (at. %) bulk MG. Mapping local diffraction patterns over representative areas also probed elastically with automated nanoindentation, two comparable correlation length scales have been identified. Specifically, local diffraction patterns are analyzed with respect to their ellipticity, revealing systematic fluctuations between positive and negative volumetric strains. A power spectrum analysis of the strain fluctuations returns a dominant length scale of the order of 100 nm, which is very much compatible with what elastic property mapping indicates. Annealing reduces the magnitude of the statistical strain fluctuations, without strongly affecting the associated fluctuation length scale. These findings demonstrate that atomic-scale strains are very likely the origin of the structurally unexpected large elastic fluctuations obtained in nanoscale contact mechanics experiments.
KW - Metallic glass
KW - 4D-STEM
KW - Strain anisotropy
KW - Nanoindentation
KW - Elastic microstructure
KW - Heterogeneities
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654991
DO - https://doi.org/10.1016/j.actamat.2026.121982
SN - 1359-6454
VL - 308
SP - 1
EP - 8
PB - Elsevier Inc.
AN - OPUS4-65499
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Popiela, Bartosz
T1 - Einfluss ausgewählter Fertigungsparameter auf die Sicherheit von Composite-Druckbehältern
N2 - In dem Vortrag wurde der Einfluss ausgewählter Fertigungsparameter auf die Sicherheit von Composite-Druckbehältern diskutiert. Die Inhalte stammen aus einem Projekt im Rahmen des BTU-BAM Graduiertenkollegs "Trustworthy Hydrogen". Darüber hinaus umfasst der Foliensatz eine Kurzvorstellung der Aktivitäten des Fachbereichs 3.5 im Bereich der Wasserstofftechnologien.
T2 - Workshop "Wasserstoff in der Luftfahrt: Wasserstoffspeicherung und -transport für Luftfahrt und darüber hinaus"
CY - Berlin, Germany
DA - 11.02.2026
KW - Composite
KW - Druckbehälter
KW - Fertigung
PY - 2026
AN - OPUS4-65498
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Vogel, Christian
A1 - Helfenstein, J.
A1 - Massey, M.
A1 - Kretzschmar, R.
A1 - Schade, U.
A1 - Verel, R.
A1 - Chadwick, O.
A1 - Frossard, E.
T1 - Spectroscopic analysis shows crandallite can be a major component of soil phosphorus
N2 - Phosphorus (P) bioavailability is crucial for the productivity of natural and agricultural ecosystems, and soil P speciation plays a major role therein. Better understanding of P forms present in soil is thus essential to predict bioavailability. However, P speciation studies are only as powerful as the reference spectra used to interpret them, and most studies rely on a limited set of reference spectra. Most studies on soil P forms differentiate between Ca-bound P (e.g. apatite), organic P, Fe-bound P, and Al-bound P. In our analysis of a Ca, Al, and P rich soil from the Kohala region of Hawaii, we identified the mineral crandallite, CaAl3(PO4)2(OH)5·H2O, a mineral previously not considered to play a significant role in soils. Crandallite was first identified with powder X-ray diffraction. Subsequently reference spectra were collected, and the presence of crandallite was confirmed using micro-focused P K-edge X-ray absorption near edge structure (XANES) spectroscopy, micro-infrared spectroscopy, and solid-state 31P nuclear magnetic resonance (NMR) spectroscopy. Crandallite XANES spectra were distinct from other common XANES spectra due to the presence of features in the post-edge region of the spectrum. Linear combination fitting of bulk P K-edge XANES spectra allowed the determination of the proportion of crandallite to the total P content, indicating that crandallite comprises up to half, possibly even more of the soil P in the samples. Crandallite is therefore an important and potentially overlooked component of soil P, which pedogenically forms in soils with high P, Al, and Ca contents, where it could play an important role in P bioavailability.
KW - Phosphorus
KW - XANES spectrosocpy
KW - Infrared spectroscopy
KW - NMR spectrocopy
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654968
DO - https://doi.org/10.1016/j.geoderma.2026.117712
SN - 0016-7061
VL - 467
SP - 1
EP - 10
PB - Elsevier B.V.
AN - OPUS4-65496
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Khella, Shady
T1 - Integration of Information Models Using Semantic Web Technologies Within the Mixed Reality Data Hub
N2 - Engineering information is distributed across heterogeneous data models, ontologies, and reference data libraries (RDLs), which complicates interoperability, hinders workflow automation, and limits the deployment of industrial Mixed Reality (MR) applications. This work uses DEXPI Process semantics and Semantic Web technologies to align and integrate these heterogeneous sources into a single knowledge graph. The resulting graph provides a queryable semantic layer that enables consistent cross-source access to engineering information and supports MR application development. Beyond integration, the semantic graph enables automation of process design workflows. We demonstrate this using a basic engineering use case in which alternative flowsheet design options are generated from a semantically modeled block flow diagram (BFD).
T2 - DEXPI Days 1.0
CY - Frankfurt am Main, Germany
DA - 20.01.2026
KW - Mixed Reality
KW - Data Integration
KW - Semantic Web Technologies
KW - DEXPI
PY - 2026
AN - OPUS4-65489
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wallis, Theophilus
A1 - Darvishi Kamachali, Reza
T1 - Linking atomistic and phase-field modeling of grain boundaries II: Incorporating atomistic potentials into free energy functional
N2 - The density-based phase-field model for grain boundary (GB) thermodynamics and kinetics has offered a broad range of applications in alloy and microstructure design. Originally, this model is based on a potential energy terms that is connected to the cohesive energy of a given substance. A more rigorous approach, however, is a full consideration of an interatomic potential over the possible range of distance and therefore density. In Manuscript I of this series, we developed and thoroughly analyzed the coarse-graining of atomistic GB structures. In this work (Manuscript II), we complete the coupling between atomic and mesoscale modeling of GBs by incorporating the full interatomic potentials into the density-based free energy functional. Using GB energies calculated from atomistic simulations, the coarse-graining approach and the atomistic-integrated density-based Gibbs free energy, we effectively evaluate the density gradient energy coefficient. We found that coupling the density-based model with atomistic potentials reveal physically-sound trends in the GB equilibrium properties. A universal equation was derived to describe the potential energy contribution to the GB energy and the gradient energy coefficient for BCC-Fe and -Mo GBs, similar to the universal equation for GB excess free volume presented in Manuscript I. The proposed approach provides a mesoscale density-based model rooted in atomic-scale characteristics for reliable predictions of GB properties.
KW - Density-based model
KW - Phase-field
KW - Grain boundary structure
KW - Grain boundary thermodynamics
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654904
DO - https://doi.org/10.1016/j.actamat.2025.121787
SN - 1359-6454
VL - 305
SP - 1
EP - 17
PB - Elsevier
AN - OPUS4-65490
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Wallis, Theophilus
A1 - Ratanaphan, Sutatch
A1 - Darvishi Kamachali, Reza
T1 - Linking atomistic and phase-field modeling of grain boundaries I: Coarse-graining atomistic structures
N2 - The longstanding gap between atomistic and mesoscale simulations partly lies in the absence of a direct, physically grounded connection between atomic structure and mesoscale fields. In this work, we present a robust coarse-graining approach to systematically investigate the connection between phase-field and atomistic simulations of grain boundaries (GBs). The atomistic structures of 408 GBs in BCC-Fe and -Mo were studies to compute and analyze a continuous atomic density field. We discover a fundamental relationship between the GB density---defined as the average atomic density at the GB plane---and the GB excess free volume, an integral property of the boundary. An almost perfect linear correlation between the GB atomic density and GB excess free volume is identified. We also show that the width of BCC GBs, when scaled by the lattice constant, approaches a universal constant value. The relationships among GB density, width, and energy are systematically examined for various GB planes, and the GB energy--density correlations are classified with respect to GB types. It turns out that the atomic planes forming the GB strongly influence both the GB density and excess volume. The current results establish a dependable framework to bridge across scales, enabling density-based phase-field modeling of GBs with atomistic fidelity and enhancing the predictive reliability of mesoscale simulations.
KW - Density-based model
KW - Grain boundary structure
KW - Grain boundary thermodynamic
KW - Atomistic simulations
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654872
DO - https://doi.org/10.1016/j.actamat.2025.121786
SN - 1359-6454
VL - 305
SP - 1
EP - 14
PB - Elsevier Inc.
AN - OPUS4-65487
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Pavlidis, Sotirios
A1 - Fischer, Eric W.
A1 - Opis-Basilio, Amanda
A1 - Bera, Ayan
A1 - Guilherme Buzanich, Ana
A1 - Álvarez-Sánchez, María
A1 - Wittek, Severin
A1 - Emmerling, Franziska
A1 - Ray, Kallol
A1 - Roemelt, Michael
A1 - Abbenseth, Josh
T1 - Ambiphilic Reactivity and Switchable Methyl Transfer at a T-Shaped Bi(NNN) Complex Enabled by a Redox-Active Pincer Ligand
N2 - We report the transition-metal-like reactivity of a geometrically constrained, ambiphilic bismuth(III) trisamide. Planarization of the Bi(III) center unlocks Bi−C bond formation when reacted with mild electrophiles (alkyl iodides and triflates) accompanied by two-electron oxidation of the utilized NNN pincer nligand. The preservation of the bismuth oxidation state is confirmed by single-crystal X-ray diffraction and X-ray absorption spectroscopy and corroborated by theoretical calculations. Sequential reduction of the oxidized ligand framework alters the reactivity of a generated Bi−Me unit, enabling controlled access to methyl cation, radical, and anion equivalents. The full [Bi(Me)(NNN)]+/•/− redox series was comprehensively characterized using NMR and EPR spectroscopy as well as spectro-electrochemistry. This work represents the first example of ligand-assisted, redox-neutral C−X bond splitting at bismuth, establishing a new paradigm for synthetic bismuth chemistry.
KW - Pincer ligand
KW - XAS
KW - Redox
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654948
DO - https://doi.org/10.1021/jacs.5c18955
SN - 0002-7863
VL - 148
IS - 2
SP - 2683
EP - 2692
PB - American Chemical Society (ACS)
AN - OPUS4-65494
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Yao, Xingyu
A1 - Antunes, Margarida M.
A1 - Guilherme Buzanich, Ana
A1 - Cabanelas, Pedro
A1 - Valente, Anabela A.
A1 - Pinna, Nicola
A1 - Russo, Patrícia A.
T1 - Formation, Phase Transition, Surface, and Catalytic Properties of Cubic ZrO 2 Nanocrystals
N2 - Pseudocapacitance-type transition metal oxides have been extensively investigated as anodes for lithium-ion batteries (LIBs). Currently, they are also gaining attention for sodium-ion batteries (SIBs) due to their low volume change and safety. However, their performance in sodium storage remains limited, primarily due to the larger Na+ ion radius. Here, for the first time, an iron niobate is reported with a columbite structure as a high-Performance sodium storage anode. The presence of iron triggers the loss of long-rangeorder through disorder of the FeO6 octahedra local structure, subsequentlyallowing reversible sodium storage in an amorphous phase. Simultaneously, the formation of short-range ordered zigzag-chain structures within the NbO6 planes creates a “skeleton” that offers abundant active sites forpseudocapacitive ion storage and enhanced ion diffusion pathways. These characteristics of FeNb2O6 make it an effective intercalation host, offering high capacity along with fast Na+ kinetics, as demonstrated through operando and ex situ characterizations. It leads to an applicable reversible capacity (>300 mAh g−1) with a favorable average voltage of ≈0.6 V and excellent rate capability (180.4 mAh g−1 at a current density of 2 A g−1). This study provides insights into the development of intrinsically active transition metal oxides for Na+-ion intercalation.
KW - XAS
KW - Sodium-ion Batteries
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654955
DO - https://doi.org/10.1021/acs.chemmater.5c01483
SN - 0897-4756
VL - 37
IS - 21
SP - 8568
EP - 8580
PB - American Chemical Society (ACS)
AN - OPUS4-65495
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Liu, Yanchen
A1 - Guilherme Buzanich, Ana
A1 - Alippi, Paola
A1 - Montoro, Luciano A.
A1 - Lee, Kug‐Seung
A1 - Jeon, Taeyeol
A1 - Weißer, Kilian
A1 - Karlsen, Martin A.
A1 - Russo, Patrícia A.
A1 - Pinna, Nicola
T1 - FeNb 2 O 6 as a High‐Performance Anode for Sodium‐Ion Batteries Enabled by Structural Amorphization Coupled with NbO 6 Local Ordering
N2 - Pseudocapacitance-type transition metal oxides have been extensively investigated as anodes for lithium-ion batteries (LIBs). Currently, they are also gaining attention for sodium-ion batteries (SIBs) due to their low volume change and safety. However, their performance in sodium storage remains limited, primarily due to the larger Na+ ion radius. Here, for the first time, an iron niobate is reported with a columbite structure as a high-performance sodium storage anode. The presence of iron triggers the loss of long-range order through disorder of the FeO6 octahedra local structure, subsequently allowing reversible sodium storage in an amorphous phase. Simultaneously, the formation of short-range ordered zigzag-chain structures within the NbO6 planes creates a “skeleton” that offers abundant active sites for pseudocapacitive ion storage and enhanced ion diffusion pathways. These characteristics of FeNb2O6 make it an effective intercalation host, offering high capacity along with fast Na+ kinetics, as demonstrated through operando and ex situ characterizations. It leads to an applicable reversible capacity (>300 mAh g−1) with a favorable average voltage of ≈0.6 V and excellent rate capability (180.4 mAh g−1 at a current density of 2 A g−1). This study provides insights into the development of intrinsically active transition metal oxides for Na+-ion intercalation.
KW - SIB
KW - XAS
KW - Sodium-ion Batteries
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654931
DO - https://doi.org/10.1002/adma.202504100
SN - 0935-9648
VL - 37
IS - 46
SP - 1
EP - 13
PB - Wiley
AN - OPUS4-65493
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Faustino, Leandro A.
A1 - de Angelis, Leonardo D.
A1 - de Melo, Eduardo C.
A1 - Farias, Giliandro
A1 - dos Santos, Egon C.
A1 - Miranda, Caetano R.
A1 - Buzanich, Ana G.
A1 - Torresi, Roberto M.
A1 - de Oliveira, Paulo F.M.
A1 - Córdoba de Torresi, Susana I.
T1 - Urea synthesis by Plasmon-Assisted N2 and CO2 co-electrolysis onto heterojunctions decorated with silver nanoparticles
N2 - The N2 + CO2 co-electrolysis to urea synthesis has become a promising alternative to the energy intensive traditional processes for urea production. However, there are still challenges in this approach, especially due to the competition with HER (Hydrogen Evolution Reaction) leading to low efficiency. Electrochemistry assisted by localized surface plasmon resonance (LSPR) using metal nanoparticles has been reported to enhance different electrochemical reactions. Here we report an electrochemical LSPR assisted urea synthesis using Ag nanoparticles (NPs) supported on BiVO4/BiFeO3 catalyst mechanochemically synthesized. The electrochemical experiments were performed under dark and upon plasmon excitation at the LSPR region of Ag NPs. Our results demonstrated that exciting in the LSPR range, urea yield rate and Faradic efficiency were considerably improved with reduced overpotential, 19.2 μmol h− 1 g− 1 and FE 24.4% at +0.1 V vs RHE compared to 9.6 μmol h− 1 g− 1 and FE 9.4% at − 0.2 V vs RHE under dark conditions. Further in situ FTIR-RAS experiments for mechanism investigation revealed the presence of N-H and C-N intermediates and the real effect of Ag plasmon excitation on HER and N2 + CO2 co-electrolysis. Theoretical calculations confirm the energy of the species involved in C-N coupling as well the role of the complex catalytic sites, which agrees with XAS measurements.
KW - Plasmon-assited
KW - XAS
KW - Urea
KW - Electrocatalysis
PY - 2025
DO - https://doi.org/10.1016/j.cej.2025.163072
SN - 1385-8947
VL - 513
SP - 1
EP - 13
PB - Elsevier B.V.
AN - OPUS4-65492
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Kästle, Emanuel D.
A1 - Duffner, Eric
A1 - Popiela, Bartosz
A1 - Ghaznavi, Ali
T1 - Monitoring Failure of Composite Pressure Vessels with Acoustic Emissions
N2 - Two carbon fiber reinforced type IV pressure vessels are subjected to step-wise pressurization until burst, while monitored using acoustic emissions (AE). Unlike most prior studies, AE data is collected throughout the entire damage progression. The vessels, manufactured with differing parameters, failed in distinct composite layers – A-type in the hoop layers and B-type in the helical layers. The AE signals are evaluated to study material degradation and identify fiber breaks as signs of critical damage accumulation. The signals are distributed randomly across the surface, with localized accumulation only minutes before rupture, close to the rupture plane. The difference in manufacturing parameters did not result in any clear difference in the AE activity. Felicity and Shelby ratios show consistent decline with increasing pressure, suggesting potential for damage assessment and burst prediction. It is discussed how these ratios are affected by coupling quality of the AE sensors, the shape of the pressurization profile and prior loadings. Different signal features based on the amplitude and the frequency content are extracted for a classification into failure mechanisms. Based on previous studies, AE signals corresponding to fiber breaks have a characteristic high-frequency spectrum and show a delay in occurrence, with an increase in the number of breaking fibers towards the end of the experiment. Indeed, high frequency signals tend to occur later and signals in specific peak-frequency ranges (350 – 400 kHz, 500 kHz) somewhat resemble the expected behavior. However, the dataset is too variable and too incongruent for any clear interpretations. Likely reasons are signal propagation effects, the complex composite structure, simultaneous occurrence of signals and measurement uncertainties. A review of relevant studies is provided to show that similar issues affect also previous works. Successfully identifying fiber breaks in large-scale, complex composite structures based on AE data, and turning this into an applicable health-monitoring technique, therefore remains a challenge.
KW - Acoustic emission testing
KW - Composite pressure vessels
KW - Damage classification in fiber reinforced polymers
KW - Felicity ratio
KW - Composite failure
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654852
DO - https://doi.org/10.1007/s10921-025-01319-1
SN - 0195-9298
VL - 45
IS - 1
SP - 1
EP - 19
PB - Springer Science and Business Media LLC
AN - OPUS4-65485
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Selch, M.
A1 - Heckel, Thomas
A1 - Casperson, Ralf
ED - Dernbach, S.
ED - Härdi, R.
ED - Knape, S.
ED - Nießen, N.
ED - Salander, C.
ED - Schmitz, M.
ED - Stark, S.
ED - Rüger, B.
ED - Sauter-Servaes, T.
T1 - Neue Lösungen für die Schienenprüfung
N2 - Zur Gewährleistung eines sicheren Betriebs werden die Schienen im deutschen Eisenbahnnetz regelmäßig auf Defekte geprüft. Die aufgenommenen Prüfdaten werden derzeit überwiegend manuell gesichtet und bewertet. Die Schienenprüfung steht dabei vor der Herausforderung einer angespannten Personalsituation. Für die Auswertung der großen Menge an Daten muss daher nach effizienteren Lösungen gesucht werden.
KW - Schienenprüfung
KW - ZfP
KW - Wirbelstromprüfung
KW - Ultraschallprüfung
PY - 2026
UR - www.eurailpress.de/etr
DO - https://doi.org/10.61067/260133
SN - 0013-2845
VL - 75
IS - Januar + Februar
SP - 43
EP - 48
PB - DVV Media Group GmbH
CY - Hamburg
AN - OPUS4-65483
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Eberwein, Robert
T1 - NICHOLHy - Novel insulation concepts for liquefied hydrogen storage tanks
N2 - Liquefied Hydrogen is a promising energy carrier for the flexible import of energy to Europe. But, tanks in the relevant scale of 40 000 to 200 000 m³ do not exist yet. The upscaling of liquid hydrogen (LH2) storage tanks from the current largest tank of 4700 m³ requires a new concept for thermal insulation. NICOLHy studies novel concepts based on multiple layers of vacuum insulation panels (VIPs). Current LH2 tanks rely on the intactness of a single vacuum layer that covers the whole tank. The multilayered VIP systems offer redundancy and improve manufacturability. The Article describes the progress within the project.
KW - LH2
KW - Insulation
KW - Tanks
PY - 2026
UR - https://www.europeanenergyinnovation.eu/content/files/2025/12/EEI-Magazine---Winter-2025-Digital-Version-Spreads-2.pdf
SN - 3049-5431
VL - 2026/1
SP - 33
EP - 33
PB - Pantograf Media Ltd.
CY - London
AN - OPUS4-65481
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Schröder, Nina
A1 - Uhlig, Marvin
A1 - Kromm, Arne
A1 - Schröpfer, Dirk
A1 - Höfer, Kevin
A1 - Hensel, Jonas
A1 - Kannengießer, Thomas
T1 - Challenges in the evaluation of the weldability of old mild steels for future use
N2 - For reasons of sustainability and cost efficiency, there is an increasing trend in the steel-processing industry to retrofit existing structures, avoiding costly shutdowns or dismantling. Although welding is a cost-effective joining method, it is rarely applied to old steels, whereas riveted or bolted connections are often uneconomical. Repair and refurbishment frequently require the replacement of damaged material or the creation of dissimilar old–new steel joints. Due to the varied manufacturing processes of historical steels, not all twentieth-century steels are inherently weldable, making an initial assessment of weldability
essential. In this study, a historical non-deoxidized mild steel (produced by Siemens–Martin processing) originating from the construction of the Berlin Radio Tower (erected in 1926) was investigated using dilatometry to analyze its welding behavior. A database of welding CCT diagrams and HAZ simulations was established to support practice-oriented welding experiments, providing key insights into their weld-metallurgical behavior and weldability. Furthermore, initial welding trials were conducted, and the local residual stress states in dissimilar old–new steel joints were determined. These foundational investigations are critical for the development of innovative, load-adapted welding concepts for the repair and refurbishment of existing old-steel infrastructure in Germany.
KW - Old mild steels
KW - Repair welding
KW - Weldability
KW - Thermo-physical simulation
KW - CCT diagrams
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654784
DO - https://doi.org/10.1007/s40194-026-02366-6
SN - 1878-6669
SP - 1
EP - 14
PB - Springer nature
AN - OPUS4-65478
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Nazari, Narges
T1 - Mikrohohlkathoden als Ultraschallquellen für zerstörungsfreie Prüfung
N2 - Das Ziel dieser Arbeit ist es, das akustische Potenzial von Mikrohohlkathoden als Ultraschallquelle in der zerstörungsfreie Prüfung zu beleuchten. Im Mittelpunkt stehen Schalldruck, Richtverlauf und spektrale Anteile im Ultraschallbereich sowie der Einfluss der elektrischen Anregung. Es geht um eine praxisnahe Einordnung: Welche Stärken bringen MHCs als Sender mit, wo liegen die Grenzen. Die Ergebnisse sollen eine Grundlage schaffen, um MHCDs als neue Klasse kompakter Luft-Ultraschallquellen weiterzuentwickeln und gezielt in Prüfaufgaben einzusetzen.
KW - Luftgekoppelter Ultraschall
KW - Mikrohohlkathoden
KW - Plasmaakustik
PY - 2025
SP - 1
EP - 57
PB - Technische Universität Berlin
CY - Berlin
AN - OPUS4-65479
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bustos, Jenna
A1 - Shohel, Mohammad
A1 - Guilherme Buzanich, Ana
A1 - Zakharov, Lev
A1 - Buils, Jordi
A1 - Segado‐Centellas, Mireia
A1 - Bo, Carles
A1 - Nyman, May
T1 - Technetium and Rhenium Auto‐reduction, Polymerization and Lability towards Group VII Polyoxometalate Chemistry
N2 - AbstractGroup VII Tc and Re have long been studied to develop both radiopharmaceuticals and technologies for nuclear materials management. Fundamental research has targeted understanding this periodic table crossroads where polyoxometalates meets metal‐metal bonded complexes. Here we have isolated green hygroscopic and metastable crystals of (ReVI,oct)2(ReVII,tet)2(OH)2(O)12⋅H2O (ReVI,VII‐green, tet=tetrahedral, oct=octahedral), determined by single‐crystal x‐ray diffraction. In addition to color, Re‐L1 X‐ray absorption near‐edge spectroscopy confirms the reduced oxidation state. ReVI,VII‐green provides the first demonstration of Re autoreduction, long‐observed for Mn and Tc. We also isolated and structurally characterized [Tc4O4(H2O)2(ReO4)14]2− (Tc4Re14) polyanion crystals that contain Tc(V) and Re(VII), consistent with greater stability of reduced Tc compared to reduced Re. Small angle X‐ray scattering of both compounds and prior‐reported polyanion [Tc4O4(H2O)2(TcO4)14]4− (Tc20) dissolved in acetonitrile indicated a qualitative lability order of oxo‐linkages of Re‐O−Re Re‐O−Tc Tc‐O−Tc, and lability of Tc20 was also probed by 99Tc nuclear magnetic resonance spectroscopy. Computation provided insight into 99Tc chemical shifts as well as lability. Based on both reducibility and solution phase dynamics of polynuclear compounds investigated here, Re is an imperfect surrogate for Tc, and further expansion of group VII polyoxometalate chemistry seems promising.
KW - XANES
KW - Polyoxometalate
KW - Technetium
PY - 2025
DO - https://doi.org/10.1002/chem.202404144
SN - 0947-6539
VL - 31
IS - 21
SP - 1
EP - 7
PB - Wiley-VCH Verl.
AN - OPUS4-65491
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -