TY - CONF
A1 - Emamverdi, Farnaz
T1 - Molecular Mobility and Physical Aging of Polymers with Intrinsic Microporosity (PIM-1) Revisited: A Big Glassy World
N2 - Polymeric membranes represent a cost- and energy-efficient solution for gas separation. Recently Polymers of Intrinsic Microporosity (PIMs) have been in a great interest because of their outstanding BET surface area larger than 700m2/g and pore size smaller than 1 nm. PIMs are a promising candidate in gas separation with high permeability and appealing selectivity due to their inefficient packing derived from a combination of ladder-like rigid segments with sites of contortion. However, it is recognized this class of polymers suffer from decrease in performance with time due to physical aging. The initial microporous structures approach a denser state via local chain rearrangements, leading to a dramatic reduction in permeability. As chain packing during film casting and physical aging are the key factors determine the performance in separation applications, characterization of the molecular mobility in these materials has been proved to provide valuable information. In recent research on PIM-1 the archetypal PIM, a molecular relaxation process with high activation energy together with a significant conductivity in the glassy state has been found and explained with the formation of local intermolecular agglomerates due to interaction of π-electrons in aromatic moieties of the polymer backbone. In this work, the dielectric behavior of the polymeric films and their response upon heating (aging) were measured by isothermal frequency scans during different heating/cooling cycles in a broad temperature range down to 133K for the first time. Multiple dielectric processes following Arrhenius behavior were observed. Local fluctuations, Maxwell-Wagner-Sillars (MWS) polarization and structural relaxations were discussed correlating to structural-properties of PIM-1. Up to now, no other work has studied the role of porosity and thermal history of PIM-1 film in dielectric processes. The goal is by eliminating thermal history and considering storing conditions provide better understanding on aging and plasticizing in high free volume glassy polymer PIM-1.
T2 - Euromembrane conference
CY - Copenhagen, Denmark
DA - 29.11.2021
KW - Physical aging
KW - Membrane
KW - Microporous structure
KW - Glassy polymer
PY - 2021
AN - OPUS4-55758
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Emamverdi, Farnaz
T1 - Molecular Mobility and Physical Aging of Polymers with Intrinsic Microporosity (PIM-1) Revisited: A Big Glassy World
N2 - Polymeric membranes represent a cost- and energy-efficient solution for gas separation. Recently Polymers of Intrinsic Microporosity (PIMs) have been in a great interest because of their outstanding BET surface area larger than 700m2/g and pore size smaller than 1 nm. PIMs are a promising candidate in gas separation with high permeability and appealing selectivity due to their inefficient packing derived from a combination of ladder-like rigid segments with sites of contortion. However, it is recognized this class of polymers suffer from decrease in performance with time due to physical aging. The initial microporous structures approach a denser state via local chain rearrangements, leading to a dramatic reduction in permeability. As chain packing during film casting and physical aging are the key factors determine the performance in separation applications, characterization of the molecular mobility in these materials has been proved to provide valuable information. In recent research on PIM-1 the archetypal PIM, a molecular relaxation process with high activation energy together with a significant conductivity in the glassy state has been found and explained with the formation of local intermolecular agglomerates due to interaction of π-electrons in aromatic moieties of the polymer backbone. In this work, the dielectric behavior of the polymeric films and their response upon heating (aging) were measured by isothermal frequency scans during different heating/cooling cycles in a broad temperature range down to 133K for the first time. Multiple dielectric processes following Arrhenius behavior were observed. Local fluctuations, Maxwell-Wagner-Sillars (MWS) polarization and structural relaxations were discussed correlating to structural-properties of PIM-1. Up to now, no other work has studied the role of porosity and thermal history of PIM-1 film in dielectric processes. The goal is by eliminating thermal history and considering storing conditions provide better understanding on aging and plasticizing in high free volume glassy polymer PIM-1.
T2 - IDS Online Meeting
CY - Berlin, Germany
DA - 06.09.2021
KW - Physical Aging
KW - BDS
KW - Microporous structure
KW - Permeation
PY - 2021
AN - OPUS4-55766
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Emamverdi, Farnaz
T1 - Molecular mobility and gas transport properties of mixed matrix membranes based on PIM-1 and POF fillers
N2 - Especially now in times of the energy revolution, the demand for energy-efficient separation processes promotes the advancement of new high-performance materials for use as highly selective separation membranes. Polymers with intrinsic microporosity (PIMs) are of high interest in the field of gas separation membranes. Currently the application of PIMs for membrane technology is still restrained by their strong tendency to physical aging involving a significant loss of their good gas separation properties. Physical aging phenomenon is related to the molecular mobility of PIMs which was investigated by broadband dielectric spectroscopy (BDS) previously [1]. In this work, covalent phosphinine-based framework (Eto-CPSF) was used as a nanofiller (0-10 wt %) in a PIM-1 matrix to potentially enhance the gas transport properties and prevent physical aging. Since molecular mobility is a fundamental parameter determining gas transport as well as physical aging in such a material, our study includes dielectric investigations by BDS of pure PIM-1 and PIM-1/Eto-CPSF mixed matrix membranes to establish a correlation between molecular mobility and gas transport properties. In addition, gas permeability was determined by the time-lag method (0-10 bar pressure) at 35 °C for N2, O2, CH4 and CO2 for all MMMs.
The dielectric behavior of the polymeric films and their response upon heating were measured by isothermal frequency scans during different heating/cooling cycles in a broad temperature range up to 250 °C. Multiple dielectric processes following Arrhenius behavior were observed. Local fluctuations, Maxwell-Wagner-Sillars (MWS) polarization and structural relaxations were discussed correlating to structural-properties of PIM-1. As main result for MMMs, the permeability of PIM-1 for CH4 and CO2 gases were increased significantly with only 5 wt% of nanofiller within the polymer matrix. However, this is not observed for Eto-CPSF concentrations higher than ca. 7 wt% probably due to a microphase separated morphology of the nanocomposite system. Furthermore, the permselectivity of membranes for pair gases O2/N2 and CO2/N2 show enhancement up to a concentration of about 7 wt% Eto-CPSF filler.
T2 - 11th BDS conference
CY - San Sebastian, Spain
DA - 04.09.2022
KW - Gas transport
KW - BDS
KW - Mixed Matrix Membrane
KW - Nanocomposite
PY - 2022
AN - OPUS4-55752
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Elert, Anna Maria
A1 - Chen, Yong-Cin
A1 - Smales, Glen Jacob
A1 - Topolniak, Ievgeniia
A1 - Sturm, Heinz
A1 - Schönhals, Andreas
A1 - Szymoniak, Paulina
T1 - Effects of the charge density of nanopapers based on carboxymethylated cellulose nanofibrils investigated by complementary techniques
N2 - Cellulose nanofibrils (CNFs) with different charge densities were prepared and investigated by a combination of different complementary techniques sensitive to the structure and molecular dynamics of the system. The morphology of the materials was investigated by scanning electron microscopy (SEM) and X-ray scattering (SAXS/WAXS). The latter measurements were quantitatively analyzed yielding to molecular parameters in dependence of the charge density like the diameter of the fibrils, the distance between the fibrils, and the dimension of bundles of nanofibrils, including pores. The influence of water on the properties and the charge density is studied by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and broadband dielectric spectroscopy. The TGA measurements reveal two mass loss processes. The one at lower temperatures was related to the loss of water, and the second process at higher temperatures was related to the chemical decomposition. The resulting char yield could be correlated to the distance between the microfibrils. The DSC investigation for hydrated CNFs revealed three glass transitions due to the cellulose segments surrounded by water molecules in different states. In the second heating scan, only one broad glass transition is observed. The dielectric spectra reveal two relaxation processes. At low temperatures or higher frequencies, the β-relaxation is observed, which is assigned to localized fluctuation of the glycosidic linkage. At higher temperatures and lower frequencies, the α-relaxation takes places. This relaxation is due to cooperative fluctuations in the cellulose segments. Both processes were quantitatively analyzed. The obtained parameters such as the relaxation rates were related to both the morphological data, the charge density, and the content of water for the first time.
KW - Cellulose nanofibrils
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-600528
DO - https://doi.org/https://doi.org/10.1021/acsomega.4c00255
SN - 2470-1343
VL - 9
SP - 20152
EP - 20166
PB - ACS
AN - OPUS4-60052
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Eisentraut, Paul
A1 - Altmann, Korinna
T1 - Repräsentative Mikroplastik-Detektion in Umweltproben - Weiterentwicklung der TED-GC/MS
N2 - Die große Herausforderung in der Detektion von Mikroplastik (MP)‑Partikeln (1-1000 µm) besteht darin, sie neben Millionen von natürlichen Partikeln in Umweltproben nachzuweisen. Zum Aufspüren von Senken, Eintragspfaden und für Monitoring-Kampagnen ist ein schnelles, automatisiertes Verfahren unerlässlich. Ein solches Verfahren wurde an der Bundesanstalt für Materialforschung und -prüfung (BAM) mit der ThermoExtraktion/Desorption-Gaschromatographie-Massenspektrometrie (TED-GC/MS) in den letzten Jahren entwickelt.
KW - Mikroplastik
KW - TED-GC/MS
PY - 2021
UR - https://analyticalscience.wiley.com/do/10.1002/was.0004000195
SN - 0016-3538
SP - 2
EP - 5
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-54266
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eisentraut, Paul
T1 - Microplastic analysis using TED-GC/MS: H/D-Exchange of decomposition products of D-marked polystyrene as an internal standard
N2 - Deuterated polystyrene (D-PS) improves microplastic detection with TED-GC / MS, among other things through higher reproducibility. It is inexpensive (0.1 ct / analysis) and can be dosed quickly and reproducibly thanks to its good solubility (e.g. in toluene). However, certain matrices lead to an exchange of the deuterium with hydrogen. The poster shows the measuring principle, in which matrices H/D-exchange takes place, the results of kinetic studies and ways of preventing or circumventing the H/D-exchange.
T2 - SALSA MAKE AND MEASURE 2021
CY - Online meeting
DA - 16.09.2021
KW - Microplastic
KW - H/D-Exchange
KW - Internal Standard
KW - TED-GC/MS
KW - Thermoanalytic
PY - 2021
AN - OPUS4-53681
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eisentraut, Paul
T1 - Mikroplastikanalytik mittels TED-GC/MS: H/D-Austausch an Zersetzungsprodukten von D-markiertem Polystyrol als interner Standard
N2 - Deuteriertes Polystyrol (D-PS) verbessert die Mikroplastikdetektion mit der TED-GC/MS, u.a. durch höhere Reproduzierbarkeit. Es ist kostengünstig (0,1 ct/Analyse) und durch die gute Löslichkeit (z.B. in Toluol) schnell und reproduzierbar zu dosieren. Bestimmte Matrices führen jedoch zu einem Austausch des Deuteriums durchWasserstoff. Das Poster zeigt das Messprinzip, bei welchen Matrices H/D-Austausch erfolgt, Ergebnisse von Kinetikuntersuchungen sowie Möglichkeiten, den Austausch zu verhindern oder zu umgehen.
T2 - Tagung der Wasserchemischen Gesellschaft
CY - Online Meeting
DA - 10.05.2021
KW - Mikroplastik
KW - Analyse
KW - Interner Standard
KW - H/D-Austausch
PY - 2021
AN - OPUS4-52727
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eisentraut, Paul
T1 - Qualitätssicherung bei der Analyse von Mikroplastik per TED GC/MS
N2 - Die Thermo Extraktion Desorption Gas Chromatograpie Massen Spektrometrie (TED-GC/MS) ist ein schnelles thermoanalytisches Verfahren zur Bestimmung von Gehalten an Mikroplastik (MP). Die Kombination aus teils schwerflüchtigen Analyten und Kältebrücken führt zu Memory-Effekten, denen u.a. durch häufige Blindwertmessungen begegnet werden muss. Reduzierte Probedurchsätze sind die Folge. Um Messergebnisse abzusichern und den Gerätestatus bei gleichzeitig hoher Messleistung überwachen zu können, wurde die sequentielle Standardmethode überarbeitet.
T2 - Tagung der Wasserchemischen Gesellschaft 2022
CY - Online meeting
DA - 23.05.2022
KW - Mikroplastik
KW - Thermoanalytik
KW - TED-GC/MS
KW - Qualitätssicherung
PY - 2022
AN - OPUS4-55087
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eisentraut, Paul
T1 - Improvements in micro- & nanoplastic mass detection by TED-GC/MS
N2 - Introduction to microplastics, definition, relevance, analytical approaches & challenges. TED-GC/MS working principle, features & performance. Optimisation in TED-GC/MS methodology, new validation data. Replacement of Internal Standard, outlook towards upcoming publication and application within EU´s revised drinking water directive.
T2 - SETAC 2023
CY - Dublin, Ireland
DA - 01.05.2023
KW - Microplastics
KW - Thermoanalytics
KW - Validation
KW - Internal Standard
PY - 2023
AN - OPUS4-57421
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eisentraut, Paul
T1 - Fast quantitative detection of microplastics using TED-GC/MS, an innovative thermoanalytical method
N2 - Im Vortrag wird die BAM vorgestellt und die Motivation für Engagement im Feld der Mikroplastikanalysen dargelegt. Die Herausforderungen bei der Analyse werden aufgezeigt und der Umgang mit ihnen. Das Arbeitsprinzip der TED-GC/MS sowie Leistungsparameter werden erläutert sowie das Vorgehen zur Identifikation und Quantifizierung von Polymeren in er Umwelt. An ausgewählten Beispielen werden interessante Ergebnisse präsentiert und die Mikroplastikreferenzmaterialien der BAM vorgestellt.
N2 - In the talk, the BAM is introduced and the motivation for our engagement in the field of microplastic analysis is explained. The challenges in the analysis of microplastics are shown and how we deal with them. The working principle of TED-GC/MS and its performance parameters are presented, as well as the procedure for identifying and quantifying polymers in environmental samples. Interesting results are shown using selected examples. Finally, BAM's microplastic reference materials are highlighted.
T2 - National Environmental Monitoring Conference
CY - Online meeting
DA - 02.08.2021
KW - Microplastic
KW - TED-GC/MS
KW - Environmental analysis
PY - 2021
AN - OPUS4-53081
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Eiby, Simon H. J.
A1 - Tobler, Dominique J.
A1 - Voigt, Laura
A1 - van Genuchten, Case M.
A1 - Bruns, Stefan
A1 - Jensen, Kirsten M. Ø.
A1 - Stawski, Tomasz M.
A1 - Wirth, Richard
A1 - Benning, Liane G.
A1 - Stipp, S. L. S.
A1 - Dideriksen, Knud
T1 - Topotactic Redox-Catalyzed Transformation of Iron Oxides
N2 - Fe oxides frequently exist in systems containing both Fe(II) and Fe(III), where their reactivity is enhanced and where interfacial electron transfer from Fe(II) adsorbed to the solids causes the transformation of metastable Fe oxides. Here, we contribute to the understanding of such a transformation using green rust sulfate (GR) synthesized in the presence or absence of Si or Al as the starting material. X-ray diffraction (XRD) and pair distribution function (PDF) analyses showed that (i) rapid oxidation by Cr(VI) caused transformation to Fe oxyhydroxide with short-range ordering, with a pattern identical to that reported for the oxidation of isolated GR hydroxide sheets (i.e., a trilayer of Fe with both edge- and corner-sharing polyhedra) and (ii) goethite formed at the expense of the short-range-ordered Fe oxyhydroxide when residual Fe(II) was present, particularly when Si was absent. This is consistent with the Fe(II)-catalyzed transformation of the short-range-ordered Fe oxyhydroxide. High-resolution transmission electron microscopy (TEM) showed that the two oxidation products coexisted within individual particles and that particle shape and the crystallographic orientation of both products were inherited from the original GR crystals, i.e., they had formed through topotactic transformation. We interpret that the structural reorganization to goethite occurred either in response to distortions caused by polaron movement or as a result of electron transfer reactions occurring at internal surfaces. Once nucleated, goethite growth can be sustained by dissolution–reprecipitation.
KW - Iron oxide
KW - Electron microscopy
KW - Pair distribution funvtion
KW - Total scattering
PY - 2025
DO - https://doi.org/10.1021/acsearthspacechem.5c00220
SN - 2472-3452
SP - 1
EP - 12
PB - American Chemical Society (ACS)
AN - OPUS4-64924
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Eggert, Claudia
A1 - Hodoroaba, Vasile-Dan
T1 - Welcome and Introduction
N2 - Nanotechnology has emerged over the past decade as a key field involving the design, characterization, production, and application of materials, structures, devices, and systems at the nanometer scale. Due to their large specific surface area and significant surface chemistry, nanomaterials offer enhanced material properties and product functionalities.
However, alongside these advancements comes the potential risk to humans and the environment. The development of nanomaterials has provided new opportunities to understand matter at the nanoscale, accelerating the creation of innovative advanced materials and devices. The expertise gained in the standardization and regulation of nanomaterials, particularly in characterizing nanoparticulate matter, should be applied to other innovative advanced materials, such as (nano)composites, 2D structures, additive manufactured materials, gels, and foams. Initial guidance for the safe-and-sustainable-by-design (SSbD) development of advanced materials during the early innovation phase has been introduced by various groups and projects. Additionally, digital material passports (DMP) and digital product passports (DPP) need to be defined and implemented uniformly across Europe.
In 2024, the Innovative Advanced Materials Initiative (IAM-I) was launched by European stakeholders to contribute to a "Research and Innovation ecosystem that will significantly accelerate the time-to-market of sustainable innovative advanced materials (IAMs) and associated technologies designed for a digital circular economy." Knowledge transfer is a crucial pillar of this ecosystem, and a future IAM-I Academy could be a valuable tool. Initially, it is essential to define "education & training needs to boost Europe’s competitiveness and sovereignty within the area of IAM."
T2 - Nano and Beyond - What can we learn from Nano for other Innovative Advanced Materials?
CY - Online meeting
DA - 04.07.2025
KW - Advance Materials
KW - Nanomaterials
KW - IAM-I
KW - SSbD
KW - DMP
KW - DPP
PY - 2025
UR - https://www.bam-akademie.de/kursangebot/kurs/webinar-nano-and-beyond-55.html?lang=en
AN - OPUS4-63690
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Edzards, Joshua
A1 - Saßnick, Holger-Dietrich
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Valencia, Ana M.
A1 - Emmerling, Franziska
A1 - Beyer, Sebastian
A1 - Cocchi, Caterina
T1 - Effects of Ligand Substituents on the Character of Zn-Coordination in Zeolitic Imidazolate Frameworks
N2 - Due to their favorable properties and high porosity, zeolitic imidazolate frameworks (ZIFs) have recently received much limelight for key technologies such as energy storage, optoelectronics, sensorics, and catalysis. Despite widespread interest in these materials, fundamental questions regarding the zinc coordination environment remain poorly understood. By focusing on zinc(II)2-methylimidazolate (ZIF-8) and its tetrahedrally coordinated analogues with Br-, Cl-, and H-substitution in the 2-ring position, we aim to clarify how variations in the local environment of Zn impact the charge distribution and the electronic properties of these materials. Our results from densityfunctional theory confirm the presence of a Zn coordinative bond with a large polarization that is quantitatively affected by different substituents on the organic ligand. Moreover, our findings suggest that the variations in the Zn coordination induced by the functionalization have a negligible effect on the electronic structure of the considered compounds. On the other hand, halogen terminations of the ligands lead to distinct electronic contributions in the vicinity of the frontier region which ultimately reduce the band gap size by a few hundred millielectron volts. Experimental results obtained from X-ray absorption spectroscopy (Zn K-edge) confirm the trends predicted by theory and, together with them, contribute to a better understanding of the structure−property relationships that are needed to tailor ZIFs for target applications.
KW - Surfaces
KW - Physical and Theoretical Chemistry
KW - General Energy
KW - Electronic
KW - Coatings and Films
KW - Optical and Magnetic Materials
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-589117
DO - https://doi.org/10.1021/acs.jpcc.3c06054
SN - 1932-7447
VL - 127
IS - 43
SP - 21456
EP - 21464
PB - American Chemical Society (ACS)
AN - OPUS4-58911
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Duwe, M.
T1 - Thickness Profiling of the Superficial Amorphization and Re-Crystallization of Silicon Induced by Femtosecond Laser Pulses
N2 - Crystalline Silicon undergoes a complex phase-change dynamic of melting, amorphization, ablation and re-crystallization upon irradiation with high intensity ultra-short laser pulses [1]. The final state of such a modified surface spot depends on many factors, most notably the local fluence and the surface’s crystal orientation. In this study, we induced superficial structure and phase changes in Silicon <111> and <100> wafers using single femtosecond laser pulses (790 nm, 30 fs) for a range of different peak fluences. The resulting surface modifications were studied in great detail using a number of different techniques, including spectroscopic imaging ellipsometry (SIE), atomic force microscopy, high-resolution transmission electron microscopy (HRTEM), and energy dispersive X-ray spectroscopy within scanning transmission electron microscopy (STEM-EDX).
Playing a pivotal role in this work, SIE provided non-destructive measurements for the calculation of the radial amorphous layer-thickness profiles of the irradiated spots using a two-layer thin-film model (Silicon dioxide and amorphous Silicon on a crystalline Silicon substrate). The measurements further allowed for the analysis of the oxide-layer modifications induced by the laser treatment. The results of the SIE-calculations were cross-checked by an in-depth material lamella via HRTEM and STEM-EDX.
T2 - 11th Workshop Ellipsometry (WSE 11)
CY - Steyr, Austria
DA - 06.09.2021
KW - Femtosecond Laser
KW - Spectroscopic imaging ellipsometry
KW - Amorphization
KW - Ablation
KW - Re-crystallization
PY - 2021
AN - OPUS4-53363
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Durlo Tambara, Luís Urbano
A1 - Nikoonasab, Ali
A1 - Radtke, Martin
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Gluth, Gregor
T1 - Determination of the oxidation depths of ground granulated blast furnace slag-containing cement pastes using Mn K-edge X-ray absorption near-edge structure spectroscopy
N2 - The redox potential of the pore solution of hardened cements containing ground granulated blast furnace slag (GGBFS) affects reinforcement corrosion and immobilization of radioactive waste. Here, Mn K-edge X-ray absorption near-edge structure (XANES) spectroscopy was applied to determine the depth profile of the oxidation state of manganese in hardened GGBFS-containing cement pastes. Manganese was oxidized in the outer regions of some of the pastes, but the depth to which this occurred was not identical with the ‘blue-green/white color change front’, usually interpreted as indicating oxidation of sulfur species. For CEM III/B, the color change of the material was gradual and thus unsuitable for a precise determination of the oxidation depth, while for the alkali-activated slag, a distinct color change front was found, but full oxidation of manganese and sulfur had not occurred in the brighter region. Mn K-edge XANES spectroscopy is thus a more reliable method than the determination of the visual color change front to follow the ingress of the oxidation front.
KW - Manganese
KW - Oxidation
KW - Sulfide
KW - Alkali-activated materials
KW - Redox conditions
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-651469
DO - https://doi.org/10.1111/jace.70445
SN - 0002-7820
SN - 1551-2916
VL - 109
IS - 1
SP - 1
EP - 11
PB - Wiley
CY - Oxford
AN - OPUS4-65146
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dumit, Verónica I.
A1 - Furxhi, Irini
A1 - Nymark, Penny
A1 - Afantitis, Antreas
A1 - Ammar, Ammar
A1 - Amorim, Monica J. B.
A1 - Antunes, Dalila
A1 - Avramova, Svetlana
A1 - Battistelli, Chiara L.
A1 - Basei, Gianpietro
A1 - Bossa, Cecilia
A1 - Cimpan, Emil
A1 - Cimpan, Mihaela Roxana
A1 - Ciornii, Dmitri
A1 - Costa, Anna
A1 - Delpivo, Camilla
A1 - Dusinska, Maria
A1 - Fonseca, Ana Sofia
A1 - Friedrichs, Steffi
A1 - Hodoroaba, Vasile-Dan
A1 - Hristozov, Danail
A1 - Isigonis, Panagiotis
A1 - Jeliazkova, Nina
A1 - Kochev, Nikolay
A1 - Kranjc, Eva
A1 - Maier, Dieter
A1 - Melagraki, Georgia
A1 - Papadiamantis, Anastasios G.
A1 - Puzyn, Tomasz
A1 - Rauscher, Hubert
A1 - Reilly, Katie
A1 - Jiménez, Araceli Sánchez
A1 - Scott‐Fordsmand, Janeck J.
A1 - Shandilya, Neeraj
A1 - Shin, Hyun Kil
A1 - Tancheva, Gergana
A1 - van Rijn, Jeaphianne P. M.
A1 - Willighagen, Egon L.
A1 - Wyrzykowska, Ewelina
A1 - Bakker, Martine I.
A1 - Drobne, Damjana
A1 - Exner, Thomas E.
A1 - Himly, Martin
A1 - Lynch, Iseult
T1 - Challenges and Future Directions in Assessing the Quality and Completeness of Advanced Materials Safety Data for Re‐Usability: A Position Paper From the Nanosafety Community
N2 - Ensuring data quality, completeness, and interoperability is crucial for progressing safety research, Safe‐and‐Sustainable‐by‐Design approaches, and regulatory approval of nanoscale and advanced materials. While the FAIR (Findable, Accessible, Interoperable, and Re‐usable) principles aim to promote data re‐use, they do not address data quality, essential for data re‐use for advancing sustainable and safe innovation. Effective quality assurance procedures require (meta)data to conform to community‐agreed standards. Nanosafety data offer a key reference point for developing best practices in data management for advanced materials, as their large‐scale generation coincided with the emergence of dedicated data quality criteria and concepts such as FAIR data. This work highlights frameworks, methodologies, and tools that address the challenges associated with the multidisciplinary nature of nanomaterial safety data. Existing approaches to evaluating the reliability, relevance, and completeness of data are considered in light of their potential for integration into harmonized standards and adaptation to advance material requirements. The goal here is to emphasize the importance of automated tools to reduce manual labor in making (meta)data FAIR, enabling trusted data re‐use and fostering safer, more sustainable innovation of advanced materials. Awareness and prioritization of these challenges are critical for building robust data infrastructures.
KW - Advanced materials
KW - Safety data
KW - Re-usability
KW - Nanosafety
KW - SSbD
KW - FAIR
KW - Standardisation
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-652918
DO - https://doi.org/10.1002/adsu.202500567
SN - 2366-7486
SP - 1
EP - 18
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-65291
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dudziak, Mateusz
A1 - Topolniak, Ievgeniia
A1 - Silbernagl, Dorothee
A1 - Altmann, Korinna
A1 - Sturm, Heinz
T1 - Long-time behavior of surface properties of microstructures fabricated by multiphoton lithography
N2 - The multiphoton lithography (MPL) technique represents the future of 3D microprinting, enabling the production of complex microscale objects with high precision. Although the MPL fabrication parameters are widely evaluated and discussed, not much attention has been given to the microscopic properties of 3D objects with respect to their surface properties and time-dependent stability. These properties are of crucial importance when it comes to the safe and durable use of these structures in biomedical applications. In this work, we investigate the surface properties of the MPL-produced SZ2080 polymeric microstructures with regard to the physical aging processes during the post-production stage. The influence of aging on the polymeric microstructures was investigated by means of Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS). As a result, a time-dependent change in Young’s Modulus, plastic deformation, and adhesion and their correlation to the development in chemical composition of the surface of MPL-microstructures are evaluated. The results presented here are valuable for the application of MPL-fabricated 3D objects in general, but especially in medical technology as they give detailed information of the physical and chemical time-dependent dynamic behavior of MPL-printed surfaces and thus their suitability and performance in biological systems.
KW - Multiphoton lithography
KW - Additive manufacturing
KW - Microfabrication
KW - SZ2080 negative photo-resist
KW - Young´s modulus
KW - Aging
KW - Surface properties
KW - X-ray photoelectron spectroscopy
KW - Atomic force microscopy
KW - Force-distance-curve
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-542166
DO - https://doi.org/10.3390/nano11123285
SN - 2079-4991
VL - 11
IS - 12
SP - 1
EP - 12
PB - MDPI
CY - Basel
AN - OPUS4-54216
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dudziak, Mateusz
A1 - Riechers, Birte
A1 - Maaß, Robert
A1 - Michalchuk, Adam
A1 - Schönhals, Andreas
A1 - Szymoniak, Paulina
T1 - Beyond conventional calorimetry: Unlocking thermal characterization with fast scanning techniques
N2 - Fast scanning calorimetry (FSC) has emerged as a transformative technique in thermal analysis, enabling the investigation of rapid and kinetically driven thermal transitions that are inaccessible to conventional differential scanning calorimetry. This review highlights the capabilities enabled by FSC for studying a wide range of materials under extreme thermal conditions, including polymers, pharmaceuticals, metallic glasses, nanocomposites, and hydrogels. By employing ultrafast heating and cooling rates, FSC allows for the suppression of crystallization, resolution of weak transitions, and analysis of thermally labile or size-limited samples. The technique is particularly valuable for probing glass transitions, relaxation phenomena, and phase behavior in systems with complex morphologies or confined geometries. Case studies demonstrate the use of FSC in characterizing vitrification, physical aging, and interfacial dynamics, as well as its application in emerging fields such as additive manufacturing, supramolecular systems, and neuromorphic materials. Together, these examples underscore the role that FSC plays in advancing the understanding of structure-property relationships across diverse material classes.
KW - Flash DSC
KW - Calorimetry
KW - Glass transition
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-647405
DO - https://doi.org/10.1016/j.tca.2025.180177
VL - 754
SP - 1
EP - 14
PB - Elsevier B.V.
AN - OPUS4-64740
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dudziak, Mateusz
A1 - Bhatia, Riya
A1 - Dey, R.
A1 - Falkenhagen, Jana
A1 - Ullrich, M. S.
A1 - Thomsen, C.
A1 - Schartel, Bernhard
T1 - Wastewater phosphorus enriched algae as a sustainable flame retardant in polylactide
N2 - Revolutionizing our polymer industry for adaption to a sustainable carbon circular economy has become one of today’s most demanding challenges. Exploiting renewable resources to replace fossil-fuel—based plastics with biopolymers such as poly(lactic acid) (PLA) is inevitable while using waste streams as a raw material resource at least is promising. When it comes to using PLA as technical polymer, its high flammability must be addressed by flame retardants compatible with the thermoplastic processing of PLA and its compostability. This study proposes microalgae enriched with phosphorus from wastewater (P-Algae) as an elegant way towards a kind of sustainable organophosphorus flame retardant. The concept is demonstrated by investigating the processing, pyrolysis, flammability, and fire behavior of PLA/P-Algae, while varying the P-Algae content and comparing P-Algae with four alternative bio-fillers (phosphorylated lignin, biochar, thermally treated sewage sludge, and metal phytate) with different P-contents as meaningful benchmarks.
KW - PLA
KW - Flame Retardancy
KW - Phosphorylated Algae
KW - Wastewater flame retardants
KW - Zink phytate
KW - Phosphorylated lignin
KW - Thermally treated sludge
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-604150
DO - https://doi.org/10.1016/j.polymdegradstab.2024.110885
SN - 1873-2321
SN - 0141-3910
VL - 227
SP - 1
EP - 11
PB - Elsevier Ltd.
AN - OPUS4-60415
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dubey, A.
A1 - Hon Keat, C.
A1 - Shvartsman, V.
A1 - Yusenko, Kirill
A1 - Escobar, M.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Hagemann, U.
A1 - Kovalenko, S.
A1 - Stächler, J.
A1 - Lupascu, D.
T1 - Mono-, Di-, and Tri-valent Cation Doped BiFe0.95Mn0.05O3 Nanoparticles: Ferroelectric Photocatalysts
N2 - The ferroelectricity of multivalent co-doped Bismuth ferrite (BiFeO3; BFO) nanoparticles (NPs) is revealed and utilized for light photocatalysis exploiting their narrow electronic band gap. The photocatalytic activity of ferroelectric photocatalysts BiFe0.95Mn0.05O3 (BFM) NPs and mono-, di-, or tri-valent cations (Ag+, Ca2+, Dy3+; MDT) co-incorporated BFM NPs are studied under ultrasonication and in acidic conditions. We find that such doping enhances the photocatalytic activity of the ferroelectric NPs approximately three times. The correlation of the photocatalytic activity with structural, optical, and electrical properties of the doped NPs is established. The increase of spontaneous polarization by the mono- and tri-valent doping is one of the major factors in enhancing the photocatalytic performance along with other factors such as stronger light absorption in the visible range, low recombination rate of charge carriers and larger surface area of NPs. A-site doping of BFO NPs by divalent elements suppresses the polarization, whereas trivalent (Dy3+) and monovalent (Ag+) cations provide an increase of polarization. The depolarization field in these single domain NPs acts as a driving force to mitigate recombination of the photoinduced charge carriers.
KW - Piezoresponse
KW - Bismuth Ferrite
KW - Nanoparticles
KW - Photocatalysis
KW - Ferroelectric
KW - Polarization
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-557230
DO - https://doi.org/10.1002/adfm.202207105
SN - 1616-301X
SP - 1
EP - 16
PB - Wiley
AN - OPUS4-55723
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Drobne, D.
A1 - Ciornii, Dmitri
A1 - Hodoroaba, Vasile-Dan
A1 - Bohmer, N.
A1 - Novak, S.
A1 - Kranjc, E.
A1 - Kononenko, V.
A1 - Reuther, R.
T1 - Knowledge, Information, and Data Readiness Levels (KaRLs) for Risk Assessment, Communication, and Governance of Nano-, New, and Other Advanced Materials
N2 - The obvious benefits derived from the increasing use of engineered nano-, new, and advanced materials and associated products have to be weighed out by a governance process against their possible risks. Differences in risk perception (beliefs about potential harm) among stakeholders, in particular nonscientists, and low transparency of the underlying decision processes can lead to a lack of support and acceptance of nano-, new, and other advanced material enabled products. To integrate scientific outcomes with stakeholders needs, this work develops a new approach comprising a nine-level, stepwise categorization and guidance system entitled “Knowledge, Information, and Data Readiness Levels” (KaRLs), analogous to the NASA Technology Readiness Levels. The KaRL system assesses the type, extent, and usability of the available data, information, and knowledge and integrates the participation of relevant and interested stakeholders in a cocreation/codesign process to improve current risk assessment, communication, and governance. The novelty of the new system is to communicate and share all available and relevant elements on material related risks in a user/stakeholder-friendly, transparent, flexible, and holistic way and so stimulate reflection, awareness, communication, and a deeper understanding that ultimately enables the discursive process that is needed for the sustainable risk governance of new materials.
KW - Risk asessment
KW - Advanced materials
KW - TRL
KW - Governance
KW - Data readiness level
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-575344
DO - https://doi.org/10.1002/gch2.202200211
SP - 1
EP - 9
PB - Wiley-VCH
AN - OPUS4-57534
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Driscoll, Laura L.
A1 - Driscoll, Elizabeth H.
A1 - Dong, Bo
A1 - Sayed, Farheen N.
A1 - Wilson, Jacob N.
A1 - O’Keefe, Christopher A.
A1 - Gardner, Dominic J.
A1 - Grey, Clare P.
A1 - Allan, Phoebe K.
A1 - Michalchuk, Adam
A1 - Slater, Peter R.
T1 - Under pressure: offering fundamental insight into structural changes on ball milling battery materials
N2 - Synthesis of Li ion battery materials via ball milling has been a huge area of growth, leading to new high-capacity electrode materials, such as a number of promising disordered rocksalt (DRS) phases. In prior work, it was generally assumed that the synthesis was facilitated simply by local heating effects during the milling process. In this work, we show that ball milling Li2MoO4 leads to a phase transformation to the high pressure spinel polymorph and we report electrochemical data for this phase. This observation of the formation of a high pressure polymorph shows that local heating effects alone cannot explain the phase transformation observed (phenakite to spinel) and so indicates the importance of other effects. In particular, we propose that when the milling balls collide with the material, the resulting shockwaves exert a localised pressure effect, in addition to local heating. To provide further support for this, we additionally report ball milling results for a number of case studies (Li2MnO3, Li2SnO3, Nb2O5) which reinforces the conclusion that local heating alone cannot explain the phase transformations observed. The work presented thus provides greater fundamental understanding of milling as a synthetic pathway and suggests potential strategies to prepare such samples without milling (e.g., doping to create internal chemical pressure). In addition, we suggest that further research is needed into the effect of the use of milling as a route to smaller particles, since we believe that such milling may also be affecting the surface structure of the particles through the influence of the shockwaves generated.
KW - Pollution
KW - Nuclear Energy and Engineering
KW - Sustainability and the Environment
KW - Environmental Chemistry
KW - Renewable Energy
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-590086
DO - https://doi.org/10.1039/d3ee00249g
VL - 16
IS - 11
SP - 5196
EP - 5209
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-59008
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Drexel, R.
T1 - Nano-sized Polypropylene as a Promising Candidate Reference Material: Preparation, Characterization and Stability in Complex Matrices
N2 - The lack of nanoplastic (NPs) reference materials capable of mimicking real-world scenarios is currently hampering the development of validated extraction techniques from complex matrices (e.g. soils, sediments, biota), the development of analytical approaches for robust identification and quantification, and the ability to use environmentally relevant test materials in (eco)toxicity testing and hazard assessment [1]. The large body of available data suggests that larger microplastics (MPs) in the natural environment are irregular shaped, partially degraded (chemically and physically), a continuum of sizes, shapes and densities, represent a wide range of polymer types, and acts as a reservoir for thousands of plastic chemicals. Although NPs have been described as being neither MPs nor engineered nanoparticles [2], and while direct measurement data of true NP in the environment remain elusive, they are expected to be as equally diverse as MPs [3].
Here, we present a strategy towards the development of a potential NP reference material based on nano-sized polyproplyene particles (nanoPP) developed within the EURAMET-funded PlasticTrace project (https://plastictrace.eu/). The strategy includes the preparation, the physicochemical characterization and the stability assessment of nanoPP in suspension both in its pristine state, but also when spiked into food (mineral water and milk) and environmental matrices (suspended particulate matter collected from the river Elbe ). Collected experimental data suggests nanoPP to be a promising candidate for a NP reference material.
T2 - SETAC Europe 2025
CY - Vienna, Austria
DA - 11.05.2025
KW - Nanoplastics
KW - Reference materials
PY - 2025
AN - OPUS4-63382
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Drago, Claudia
T1 - Sweetening the (microplastics) pill: PET tablets (1-100µm) as candidate reference material for the validation of microplastics measurement
N2 - The lack of validation and standard procedures in microplastics studies has led to the inability to compare and harmonise data from different analytical methods, laboratories and time scales. To monitor and regulate exposure to microplastics in the environment and in food for human health, it is crucial to ensure their comparability and to validate the analytical methods used in microplastics studies.
Monitoring microplastics requires complex approaches for accurate determination otherwise it can lead to an over- or underestimation in environmental and food-relevant matrices. Moreover, to support the need of reliable measurement required by the European legislation directive on drinking water (EU 2020/2184) or the revision of the urban waste water directive, which will be finalised in 2024 the production and validation of polymeric reference materials with environmentally relevant concentrations, irregular shapes, defined aging status and different sizes is essential. The production of reference material with acceptable uncertainties in homogeneity need to be balanced, considering the low microplastics concentrations detected in the environment and in food.
The aim of the project PLASTICTRACE and of this study, is to propose a “easy-to-use PET tablet ” (PET particle size mainly 1-100 µm) for routine applications as a candidate general reference material for detection methods. Batches of water-soluble matrix containing different concentrations of PET powder were produced.
Results of imaging and counting methods (SEM, Laser diffraction), including production´s challenges; together with thermo-analytical methods (TED-GC/MS and Py-GC/MS) and vibrational spectroscopy (µ-Raman and µ-FTIR), will be presented. These data are useful to assess homogeneity and stability of the particles over time according to ISO 33405:2024.
In addition, we will show some insights on the application of the PET-tablets in complex matrices, as milk powder and suspended solid from surface water, that could be easily used for routine microplastics analysis.
T2 - MICRO 2024
CY - Arrecife, Spain
DA - 23.09.2024
KW - Microplastics
KW - Reference materials
KW - Polymer 3R
KW - TED-GC/MS
PY - 2024
AN - OPUS4-61274
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Drago, Claudia
T1 - Rapid sample preparation to detect microplastics in baby milk powder
N2 - Microplastics, ubiquitous as it is, could be released into food during production chain, through packaging and by consumer´s use. To determinate human exposure to microplastics is crucial to monitor microplastics in food matrices. The current absence of standard sample preparation procedures to identify and quantify different microplastics according to number and mass have generate time-consuming protocols and lack of comparability among different analytical methods, laboratories and time scales.
Monitoring microplastics in complex matrices as food, and in particular in baby milk powder, requires an accurate approach that need to be validate, to ensure the comparability of results. Bottled drinking water or surface waters, for example, can be measured with mass-based methods (TED-GC/MS or Py-GC/MS) directly after filtration. Baby milk powder, instead is more challenging, due to the proteins and fatty acid that clog the filters and contaminate the measuring devices with heavy carry over.
In this study, we characterize the baby milk powder by thermogravimetric analysis (TGA) and we tested different treatments for matrix reduction: water, H2O2, citric acids. In particular, the use of citric acid was tested for protein reduction before filtration. Our hypothesis was that citric acid will induce the precipitation of proteins and amino acids, leading to a strong matrix reduction. In fact, this sample pre treatment, allowed us to use a higher intake, necessary for representative quantification. Finally, the milk powder was spiked with reference material tablets containing polyethylene terephthalate (PET). The PET was not degraded by the citric acid and high recovery rate was achieved by TED-GC/MS and Py-GC/MS methods.
Considering the simplicity and accessibility of this sample preparation and its robust results, this procedure could be easily proposed as a simple sample preparation approach to monitor microplastics by mass-based methods.
T2 - MICRO 2024
CY - Arrecife, Spain
DA - 23.09.2024
KW - Microplastics
KW - Milk
KW - Polymer 3R
KW - TED-GC/MS
PY - 2024
AN - OPUS4-61273
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Drago, C.
T1 - Standardization Methods for the Analysis of Microplastics (10 100µm) in Food Matrix: Sample Preparation and Digestion of Milk Powder.
N2 - Monitoring of microplastics in food matrices is crucial to determinate the human exposure. By direct ingestion microplastics could be released in the food during the production, through packaging and by consumer’s use. The absence of standard methods to quantify and detect different size range and type of microplastics has led to difficult and time consuming procedural steps, poor accuracy and lack of comparability. In this work, matrix characterization and laboratory experiments were used to investigate the efficiency of sample preparation in milk powder. This information is crucial to compile a standard procedure for sample preparation and digestion of common milk powder to detect different particle sizes and types of polymers. Charaterisation is done by TGA and TOC measurements.
T2 - SETAC Europe 2024
CY - Sevilla, Spain
DA - 05.05.2024
KW - Microplastics
KW - Harmonisation in microplastics
KW - Polymer 3R
KW - Microplastics in milk
PY - 2024
AN - OPUS4-60034
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Drago, C
A1 - Wiesner, Yosri
A1 - Braun, U
A1 - Giovannozi, A
A1 - Fadda, M
A1 - Putzu, Mara
A1 - Lorenzo, S
A1 - Moscoso-Pérez, C
A1 - Benismail, N
A1 - Palma, C
A1 - Almeida, J
A1 - Mattarozzi, M
A1 - Barbaresi, M
A1 - Piergiovanni, M
A1 - Masino, M
A1 - Bianchi, F
A1 - Careri, M
A1 - v Bavel, B
A1 - Maltseva, A
A1 - Sillanpää, M
A1 - Pröfrock, D
A1 - Wippermann, D
A1 - Altmann, Korinna
T1 - Harmonisation of sample preparation for microplastic analysis: Recovery rates of tablets containing microplastics as reference material for food and environmental matrix
N2 - Microplastic are found ubiquitarians in the environment and food products. Up to now, their impact of risks on health and environment is still controversially discussed, but based on the precautionary principle alone, their presence should be monitored and emission should be reduced (see here also the status of existing EU regulations ). The crucial point is not only the reduction of microplastics pollution but also the introduction of legally binding, standardized procedures for their analysis.
The limited availability of certified reference material as well as absence of standard operating procedures to identify, characterize and quantify microplastics according to number and mass have generated lack of comparability between different analytical methods and laboratories; but also, the need of time-consuming development of own protocols for each laboratory. Further on, harmonisation and standardisation of microplastics analysis requires specific reference materials that are used to validate the measurement and to ensure the comparability of results.
In the first step, we developed tablets of a water-soluble matrix, containing defined numbers of microplastic particles or mass contents. These can be solved in water and can be handled as reference materials in bottled drinking water without additional sample preparation. These samples can be measured, using mass-based methods as thermo-analytical methods like thermal desorption-gas chromatography-mass spectrometry (TED-GC/MS) or pyrolysis–gas chromatography–mass spectrometry (Py-GC/MS) and using umber-based methods as vibrational spectroscopy like Infrared and Raman directly after filtration.
The aim of this work was to delevop standard operating procedure to measure microplastics in more complex matrices and to harmonise and compare different detection and characterization methods. In fact, these matrices require different additional treatments to allow a reliable quantification and identification of microplastics.
T2 - SETAC Europe 2025
CY - Vienna, Austria
DA - 11.05.2025
KW - Microplastics
KW - Nanoplastics
PY - 2025
AN - OPUS4-63366
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dorau, Kristof
A1 - Rückamp, Daniel
A1 - Weber, Christian
A1 - Scheeder, Georg
A1 - Reßing, Ronja
A1 - Peth, Stephan
A1 - Otto, Philipp
A1 - Altmann, Korinna
A1 - Fries, Elke
A1 - Hoppe, Martin
T1 - Characterization and spatial distribution of mesoplastics in an arable soil
N2 - AbstractExtraction of plastic particles from soil is challenging and, thus, exceptionally little spatial information on plastic distribution at the field scale has been gathered. However, for environmental risk assessment, adequate sampling should complement coherent plastic profiling. In this study, we investigated the spatial distribution of mesoplastics (MePs; from 5 mm up to 130 mm) in arable soil (Haplic Cambisol) managed intensively by 12 years of compost application. Geo‐referenced samples (n = 128) and five different sampling designs (n = 45) of variable sampling volume (from 2 to 300 L) were collected at a three hectare study site in Northern Germany (0–30 cm soil depth). Soil properties such as pH and soil organic carbon (SOC) were measured to evaluate dispersion measures of these data. In total, we found 259 MePs with a predominance of transparent packaging foils made of polyethylene and coloured fibres of polypropylene. Average particle metrics were a projection area of 47 (3–400) mm2, a Feret diameter of 18.5 (5.4–130) mm and a mass of 1.89 (0.11–221) mg. Caution is advised when measuring the particle mass due to still strongly adhering soil material, especially for fibre bundles with 0.544 mg soil mg−1 particle. We recommend using a 0.1 mol L−1 tetrasodium pyrophosphate solution to purify MePs by removing attached soil before weighing for further environmental risk assessment. The MePs count with a median value of 0.50 (0–3.2) particles kg−1 and median mass of 2.26 (0–221) mg kg−1 featured the highest coefficient of variation (CV) with 103% and 187%, respectively. This is 10–20 times larger in comparison to the CV of SOC (9.2%) and even 50–93 times larger than CV of soil pH (2.2%). This leads to the need of larger sample numbers to delineate plastic metrics in comparison with soil properties to identify a reliable mean value of the field within a predefined allowable error. Mesoplastics in the soil were characterized by a pure nugget effect variogram (no spatial correlation), revealed no intrafield variability and the sample volume yielded inconclusive results. Sampling for plastics in soil should either (i) drastically increase the sample number for a single field or (ii) communicate transparently that the allowable error is by far enhanced in comparison with classical soil properties like pH and SOC. More systematic studies featuring geo‐spatial analysis of MePs and smaller‐sized plastics in soils are required to propose adequate sampling designs across multiple land uses and plastics fingerprints. A larger database would, thereupon, pave the way for best‐practice guides on how to treat ‘outliers’ and search for robust estimators for spatial mapping of plastics in soils.
KW - Large microplastics
KW - Microplastics
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-617772
DO - https://doi.org/10.1111/ejss.70016
VL - 75
IS - 6
SP - 1
EP - 16
PB - Wiley
AN - OPUS4-61777
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Donskyi, Ievgen
A1 - Nie, C.
A1 - Ludwig, K.
A1 - Trimpert, J.
A1 - Ahmed, R.
A1 - Quaas, E.
A1 - Achazi, K.
A1 - Radnik, Jörg
A1 - Adeli, M.
A1 - Haag, R.
A1 - Osterrieder, K.
T1 - Graphene Sheets with Defined Dual Functionalities for the Strong SARS-CoV-2 Interactions
N2 - Search of new strategies for the inhibition of respiratory viruses is one of the urgent health challenges worldwide, as most of the current therapeutic agents and treatments are inefficient. Severe acute respiratory syndrome coronavirus 2 (SARSCoV-2) has caused a pandemic and has taken lives of approximately two Million people to date. Even though various vaccines are currently under development, virus, and especially its spike glycoprotein can mutate, which highlights a Need for a broad-spectrum inhibitor. In this work, inhibition of SARS-CoV-2 by graphene platforms with precise dual sulfate/alkyl functionalities is investigated. A series of graphene derivatives with different lengths of aliphatic chains is synthesized and is investigated for their ability to inhibit SARS-CoV-2 and feline coronavirus.
Graphene derivatives with long alkyl chains (>C9) inhibit coronavirus replication by virtue of disrupting viral envelope. The ability of these graphene platforms to rupture viruses is visualized by atomic force microscopy and cryogenic electron microscopy. A large concentration window (10 to 100-fold) where graphene platforms display strongly antiviral activity against native SARS-CoV-2 without significant toxicity against human cells is found. In this concentration range, the synthesized graphene platforms inhibit the infection of enveloped viruses efficiently, opening new therapeutic and metaphylactic avenues against SARS-CoV-2.
KW - Graphene
KW - Graphene-based polyglycerol sulfates
KW - SARS-CoV2 inhibitor
KW - Virucidality
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-520858
DO - https://doi.org/10.1002/smll.202007091
VL - 17
IS - 11
SP - 7091
PB - Wiley VCH
AN - OPUS4-52085
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Donskyi, Ievgen
A1 - Chen, Y.
A1 - Nickl, Philip
A1 - Guday, G.
A1 - Qiao, H.
A1 - Achasi, K.
A1 - Lippitz, Andreas
A1 - Unger, Wolfgang
A1 - Böttcher, C.
A1 - Chen, W.
A1 - Adeli, M.
A1 - Haag, R.
T1 - Self-degrading graphene sheets for tumor therapy
N2 - Low biodegradability of graphene derivatives and related health risks are the main limiting factors for their in vivo biomedical applications. Here, we present the synthesis of enzyme-functionalized graphene sheets with self-degrading properties under physiological conditions and their applications in Tumor therapy. The synergistic enzyme cascade glucose oxidase and myeloperoxidase are covalently conjugated to the surface of graphene sheets and two-dimensional (2D) platforms are obtained that can produce sodium hypochlorite from glucose. The enzyme-functionalized graphene sheets with up to 289 nm average size are degraded into small pieces (≤40 nm) by incubation under physiological conditions for 24 h. Biodegradable graphene sheets are further loaded with doxorubicin and their ability for Tumor therapy is evaluated in vitro and in vivo. The laser-triggered release of doxorubicin in combination with the enzymatic activity of the functionalized graphene sheets results in a synergistic antitumor activity.
Taking advantage of their neutrophil-like activity, fast biodegradability, high photo- and chemotherapeutic effects, the novel two-dimensional nanoplatforms can be used for tumor therapeutic applications.
KW - Graphene
KW - Self-degrading
KW - Thumor therapy
KW - XPS
KW - NEXAFS
PY - 2020
DO - https://doi.org/10.1039/d0nr02159h
SP - 1
EP - 12
PB - The Royal Society of Chemistry
AN - OPUS4-50978
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dolai, Malay
A1 - Saha, Urmila
A1 - Goswami, Juli Nanda
A1 - Bhattacharya, Biswajit
A1 - Emmerling, Franziska
A1 - Ifseisi, Ahmad A.
A1 - Biswas, Surajit
ED - Bhattacharya, Biswajit
T1 - Nickel(II)-mediated in situ complex formation with unexpected ligand transformations: crystal structures, DFT calculations, and catalytic activity in CO2 fixation reactions
N2 - Two transformed ligands, namely 1,3,5-triazapentadienato(imidoylamidinato) and N-(methoxy(pyrimidin-2-yl)(pyrimidine-2-carboxamido)methyl)pyrimidine-2-carboxamide, are reported here as the first products derived from 2-cyano pyridine/pyrimidine, respectively, under nickel metal mediation in the presence of hydroxylamine hydrochloride in situ. Two different nickel-coordinated complexes (1 and 2) were formed. Single crystal X-ray diffraction revealed that complex 1 is a mononuclear complex with tetra-coordinated square planar geometry, whereas complex 2 is a dinuclear complex with hexa-coordinated distorted octahedral geometry. The synthetic pathways of both transformed ligands are explained with the support of energy calculations of different states via density functional theory (DFT) calculations. The catalytic addition reactions of epoxides and carbon dioxide efficiently produce organic cyclic carbonates in the presence of complexes 1–2, attributed to the presence of Lewis acidic nickel and Lewis basic centers, such as free amine, imine, methoxy, or nitrogen in complexes 1 and 2. Under mild reaction conditions (1 atm CO2 pressure and 60 °C temperature), different types of epoxides (exocyclic, endocyclic, and aromatic epoxides) yield high levels of respective cyclic carbonates in the presence of both complexes 1–2 as catalysts, with tert-butylammonium bromide (TBAB) acting as a co-catalyst. The high turnover number (TON) and turnover frequency (TOF) of these catalytic reactions clearly indicate the efficacy of the two catalysts.
KW - Catalytic activity in CO2 fixation reactions DFT calculations
KW - Nickel(II)-complex
KW - In situ complex formation
KW - Crystal Structure
PY - 2025
DO - https://doi.org/10.1039/d4nj01801j
SN - 1369-9261
VL - 49
IS - 11
SP - 4451
EP - 4463
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-62782
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dobosy, Péter
A1 - Nguyen, Hoang Thi Phuong
A1 - Záray, Gyula
A1 - Streli, Christina
A1 - Ingerle, Dieter
A1 - Ziegler, Philipp
A1 - Radtke, Martin
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Endrédi, Anett
A1 - Fodor, Ferenc
T1 - Effect of iodine species on biofortification of iodine in cabbage plants cultivated in hydroponic cultures
N2 - Iodine is an essential trace element in the human diet because it is involved in the synthesis of thyroid hormones. Iodine deficiency affects over 2.2 billion people worldwide, making it a significant challenge to find plant-based sources of iodine that meet the recommended daily intake of this trace element. In this study, cabbage plants were cultivated in a hydroponic system containing iodine at concentrations ranging from 0.01 to 1.0 mg/L in the form of potassium iodide or potassium iodate. During the experiments, plant physiological parameters, biomass production, and concentration changes of iodine and selected microelements in different plant parts were investigated. In addition, the oxidation state of the accumulated iodine in root samples was determined. Results showed that iodine addition had no effect on photosynthetic efficiency and chlorophyll content. Iodide treatment did not considerably stimulate biomass production but iodate treatment increased it at concentrations less than 0.5 mg/L. Increasing iodine concentrations in the nutrient solutions increased iodine content in all plant parts; however, the iodide treatment was 2–7 times more efficient than the iodate treatment. It was concluded, that iodide addition was more favourable on the target element accumulation, however, it should be highlighted that application of this chemical form in nutrient solution decreased the concetrations of selected micoelement concentration comparing with the control plants. It was established that iodate was reduced to iodide during its uptake in cabbage roots, which means that independently from the oxidation number of iodine (+ 5, − 1) applied in the nutrient solutions, the reduced form of target element was transported to the aerial and edible tissues.
KW - BAMline
KW - XANES
KW - Synchrotron
KW - Lodine
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-608330
DO - https://doi.org/10.1038/s41598-024-66575-z
VL - 14
IS - 1
SP - 1
EP - 12
PB - Springer Science and Business Media LLC
AN - OPUS4-60833
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dittrich, Maria
A1 - Paulo, Carlos
A1 - Knabe, Nicole
A1 - Sturm, Heinz
A1 - Zaitsev, Vladimir
A1 - Gorbushina, Anna
T1 - Microscopic Raman study of fungal pigment using the genetically amenable rock inhabitant Knufia petricola as a model organism
N2 - Fungal pigments such as melanin and carotenoids are distinctive markers of animal and plant pathogenic fungi as well as their environmental relatives. These complex pigments play important roles in pathogenicity and stress tolerance while also being useful as biomarkers. Accordingly, it is important to be able to identify in situ the pigments in black fungi, a group of clinical and environmental importance. In this study, wild-type and genetically modified strains of Knufia petricola A95 and wild fungal cells attached to ancient rock were investigated for their spectroscopic and microscopic Raman features and morphological appearance. Knockout mutants of melanin synthesis genes pks1 (polyketide synthase), sdh1 (scytalone dehydratase), and both pks1 and the carotenoid synthesis gene phd1 (phytoene desaturase) were studied We applied two different Raman microscopes using two lasers, with 633 nm and 488 nm wavelengths. We analyzed and compared Raman spectra between the measured reference substances and the mutant and wild-type strains. In the wild strain WT:A95, the peaks close to melanin peals were found at 1353 cm−1 and 1611 cm−1. There are no characteristic melanin peaks at 1580–1600 cm−1 and around 1350 cm−1 at the spectrum of the Δpks1/Δphd1 mutant and the Δsdh1 mutant. The Δpks1 mutant spectrum has the peaks at the beta-carotene v2 C-C in-plane stretch at 1155 cm−1 and v3 C-CH3 deformation at 1005 cm−1. The peaks of carotenoids and melanin were found in all mutants and the wild strain, except the Δpks1/Δphd1 mutant. Raman spectra allow for discrimination between the various pigments. Hence, interactions between natural fungal melanin, as well as other protective pigments, and complex environmental matrices can be characterized on a range of spatial and temporal scales.
KW - Raman Spectroscopy
KW - Instrumentation
KW - Analytical Chemistry
KW - Knufia petricola
KW - Confocal microscopy
KW - Atomic and Molecular Physics and Optics
PY - 2023
DO - https://doi.org/10.1016/j.saa.2023.123250
SN - 1386-1425
VL - 303
SP - 1
EP - 11
PB - Elsevier BV
AN - OPUS4-58792
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dittmar, Stefan
A1 - Weyrauch, Steffen
A1 - Reemtsma, Thorsten
A1 - Eisentraut, Paul
A1 - Altmann, Korinna
A1 - Ruhl, Aki S.
A1 - Jekel, Martin
T1 - Settling Velocities of Tire and Road Wear Particles: Analyzing Finely Graded Density Fractions of Samples from a Road Simulator and a Highway Tunnel
N2 - The terminal settling velocity is considered the most critical parameter determining the transport of tire and road wear particles (TRWP) in aquatic environments. Nonetheless, no respective empirical data has been reported so far. In this study, particle samples from a road simulator and a highway tunnel were investigated with a validated imaging method. Different density and size fractions of both samples were measured separately, acquiring sizes and settling velocities of more than 30,000 individual particles. In addition, tire marker polymers were analyzed for each fraction via thermal extraction desorption-gas chromatography/mass spectrometry. Finally, the acquired particle data was combined according to the fractions’ estimated tire contents in order to deduce detailed probability distributions of particle size and settling velocity for the actual TRWP from both samples. Weighted by TRWP-incorporated tire mass, median diameters of 54 and 44 μm as well as median settling velocities of 0.65 and 0.22 mm/s were found for TRWP from the road simulator and highway tunnel, respectively. This study thus provides the first ever empirical data on TRWP settling velocities in water, which can be highly valuable input for modeling the environmental transport of TRWP and for dimensioning TRWP retention systems.
KW - Microplastics
KW - TED-GC/MS
KW - Sinking velocities
KW - Transport
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-635449
DO - https://doi.org/10.1021/acs.est.5c04165
SN - 0013-936X
VL - 59
IS - 26
SP - 13434
EP - 13446
PB - American Chemical Society (ACS)
AN - OPUS4-63544
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dittmar, Stefan
A1 - Ruhl, Aki S.
A1 - Altmann, Korinna
A1 - Jekel, Martin
T1 - Settling Velocities of Small Microplastic Fragments and Fibers
N2 - There is only sparse empirical data on the settling velocity of small, non-buoyant microplastics thus far, although it is an important parameter governing their vertical transport within aquatic environments. This study reports the settling velocities of 4031 exemplary microplastic particles. Focusing on the environmentally most prevalent particle shapes, irregular microplastic fragments of four different polymer types (9–289 µm) as well as five discrete length fractions (50–600 µm) of common nylon and polyester fibers were investigated, respectively. All settling experiments were carried out in quiescent water using a specialized optical imaging setup. The method has been previously validated in order to minimize disruptive factors, e.g. thermal convection or particle interactions, and thus enable the precise measurements of the velocities of individual microplastic particles (0.003–9.094 mm/s). Based on the obtained data, ten existing models for predicting a particle’s terminal settling velocity were assessed. It is concluded that models, which were specifically deduced from empirical data on larger microplastics, fail to provide accurate predictions for small microplastics. Instead, a different approach is highlighted as a viable option for computing settling velocities across the microplastics continuum in terms of size, density and shape.
KW - Microplastics
KW - Microplastic fibers
KW - Settling velocity
KW - Sinking velocity
KW - Sedimentation
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-597455
DO - https://doi.org/10.1021/acs.est.3c09602
SN - 0013-936X
VL - 58
IS - 14
SP - 6359
EP - 6369
PB - American Chemical Society (ACS)
AN - OPUS4-59745
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dittmann, Daniel
A1 - Saal, L.
A1 - Zietzschmann, F.
A1 - Mai, M.
A1 - Altmann, Korinna
A1 - Al-Sabbagh, Dominik
A1 - Ruhl, A. S.
A1 - Jekel, M.
A1 - Braun, U.
T1 - Aktivkohlecharakterisierung als weiterer Schlüssel für Adsorptionsprognosen organischer Spurenstoffe in der vierten Reinigungsstufe
N2 - In diesem Beitrag wird der Einfluss des Aktivkohleprodukts auf die Adsorption von Spurenstoffen aus Kläranlagenablauf gezeigt und diskutiert. Im zweiten Teil wird das Material Aktivkohle analytisch charakterisiert und die Eigenschaften systematisiert. Die gewonnenen Erkenntnisse werden mit Bezug zu Praxislösungen zusammengefasst.
T2 - Wasser 2021
CY - Online meeting
DA - 10.05.2021
KW - Aktivkohle
KW - Thermogravimetrie
KW - Zersetzungsgasanalyse
KW - Proximatanalyse
PY - 2021
SP - 373
EP - 378
AN - OPUS4-52740
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dittmann, Daniel
A1 - Lucke, T.
A1 - Ruhl, A. S.
A1 - Winzenbacher, R.
A1 - Jekel, M.
A1 - Braun, Ulrike
T1 - Untersuchungen zu biologischen, organischen und anorganischen Veränderungen granulierter Aktivkohlen während der Trinkwasseraufbereitung
N2 - Untersuchungen zu biologischen, organischen und anorganischen Veränderungen granulierter Aktivkohlen während der Trinkwasseraufbereitung des Landeswasserversorgers Langenau.
KW - Thermogravimetrie
KW - Trinkwasser
KW - Wasseraufbereitung
KW - Aktivkohle
PY - 2020
SN - 0083-6915
VL - 118
IS - 2
SP - 47
EP - 50
PB - Wiley-VCH Verlag GmbH & Co. KGaA
AN - OPUS4-51434
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dittmann, Daniel
A1 - Eisentraut, Paul
A1 - Goedecke, Caroline
A1 - Wiesner, Yosri
A1 - Jekel, M
A1 - Ruhl, A S
A1 - Braun, Ulrike
T1 - Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine
N2 - The adsorption of organic micropollutants onto activated carbon is a favourable solution for the treatment of drinking water and wastewater. However, these adsorption processes are not sufficiently understood to allow for the appropriate prediction of removal processes. In this study, thermogravimetric analysis, alongside evolved gas analysis, is proposed for the characterisation of micropollutants adsorbed on activated carbon. Varying amounts of carbamazepine were adsorbed onto three different activated carbons, which were subsequently dried, and their thermal decomposition mechanisms examined. The discovery of 55 different pyrolysis products allowed differentiations to be made between specific adsorption sites and conditions. However, the same adsorption mechanisms were found for all samples, which were enhanced by inorganic constituents and oxygen containing surface groups. Furthermore, increasing the loadings led to the evolution of more hydrated decomposition products, whilst parts of the carbamazepine molecules were also integrated into the carbon structure. It was also found that the chemical composition, especially the degree of dehydration of the activated carbon, plays an important role in the adsorption of carbamazepine. Hence, it is thought that the adsorption sites may have a higher adsorption energy for specific adsorbates, when the activated carbon can then potentially increase its degree of graphitisation.
KW - Aktivkohle
KW - TED-GC/MS
KW - Adsorption
KW - Thermoanalytik
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-506946
DO - https://doi.org/10.1038/s41598-020-63481-y
VL - 10
IS - 1
SP - 6695
PB - Nature Publishing Group
AN - OPUS4-50694
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dittmann, Daniel
T1 - Aktivkohlecharakterisierung von GAK-Filtern bei unterschiedlichen Laufzeiten
N2 - Eine umfangreich ausgestaltete Trinkwasseraufbereitung als Multibarrieren-System ist notwendig, wenn das Rohwasser direkt aus Fließgewässern entnommen wird (z. B. für das Mülheimer Verfahren). Eine der Barrieren wird, als gezielte Behandlungs- oder Sicherheitsstufe, oft als Filter mit granulierter Aktivkohle (GAK-Filter) realisiert. Ihre Standzeit kann bei geringer Wasserbelastung (DOC < 2 mg/L), z. B. bei der Landeswasserversorgung Langenau, bis zu 5 Jahre betragen. Bei Rohwasser mit höherem Organikgehalt (DOC > 7 mg/L), wie bei der Nordwasser in Rostock, wird hingegen mindestens alle drei Jahre die GAK in den Filterkolonnen ausgetauscht.
Die Rest-Adsorptionskapazität der GAK kann durch verschiedene Verfahren abgeschätzt werden, ist aber nach wie vor Gegenstand aktueller Forschung. Die weitergehende Charakterisierung der beladenen GAK kann hierbei helfen.
Auf dem Poster sollen erste Ergebnisse zu den in Langenau und Rostock eingesetzten Aktivkohlen präsentiert werden. Hierzu wurden die frischen und nach unterschiedlichen Laufzeiten beladenen GAK untersucht. Die Zusammensetzung der Anorganik und der adsorbierten Organik, welche mittels Zersetzungs¬gasanalyse charakterisiert wurde, zeigt deutliche Unterschiede. Bspw. nimmt der Calcium-Gehalt der GAK in Langenau kontinuierlich zu, wohingegen dieser in den Proben aus Rostock mit zunehmender Laufzeit zurückgeht. Umgekehrt verhält es sich mit der Organik: Die GAK aus Rostock zeigen Hinweise auf biologische Besiedelung, während diese in Langenau trotz längerer Filterlaufzeit auszubleiben scheint.
T2 - 4. Mülheimer Wasseranalytisches Seminar (MWAS2020)
CY - Mülheim an der Ruhr, Germany
DA - 16.09.2020
KW - Thermogravimetrie
KW - Trinkwasser
KW - Wasseraufbereitung
KW - Aktivkohle
PY - 2020
AN - OPUS4-51433
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Dittmann, Daniel
T1 - Experimental raw data for "Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine"
N2 - This is the repository of all experimental raw data used in the Scientific Reports publication "Specific adsorption sites and conditions derived by thermal decomposition of activated carbons and adsorbed carbamazepine" by Daniel Dittmann, Paul Eisentraut, Caroline Goedecke, Yosri Wiesner, Martin Jekel, Aki Sebastian Ruhl, and Ulrike Braun.
It includes
- overview_measurements.xlsx and overview_measurements.ods containing a list of all TGA experiments (TGA, TGA-FTIR, TED-GC-MS, and ramp-kinetics)
- TED-GC-MS.zip containing gas chromatography-mass spectrometry experimtent files for the Chemstation and OpenChrom
- TGA.zip containing thermogravimetric analyses raw data on evolved gas analyses experiments (TGA-FTIR and TED-GC-MS)
- TGA_kinetics.zip containing thermogravimetric analyses raw data on decomposition kinetic experiments (ramp-kinetics)
- TGA-FTIR.zip containing Fourier-transform infrared spectroscopy series files for OMNIC
- XRF.zip containing x-ray flourescence data on elemental composition
KW - Adsorption
KW - Aktivkohle
KW - TED-GC/MS
KW - Thermoanalytik
PY - 2020
DO - https://doi.org/10.5281/zenodo.3716316
PB - Zenodo
CY - Geneva
AN - OPUS4-51902
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dittmann, Daniel
T1 - Aktivkohle-Charakterisierung als weiterer Schlüssel für das Verständnis der Spurenstoffadsorption in der 4. Reinigungsstufe
N2 - Aktivkohle ≠ Aktivkohle, Adäquate Materialcharakterisierung - Voraussetzung für Adsorptionsprognosen und Wasserspezifische Auswahl von Aktivkohleprodukten.
Ausblick: Publikationen zu Aktivkohlecharakterisierung und Adsorptionsprognose in Vorbereitung
T2 - Wasser 2021 - Jahrestagung der Wasserchemischen Gesellschaft
CY - Online meeting
DA - 10.05.2021
KW - Aktivkohle
KW - Thermogravimetrie
KW - Zersetzungsgasanalyse
KW - Proximatanalyse
PY - 2021
AN - OPUS4-52742
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dittmann, D.
A1 - Saal, L.
A1 - Zietschmann, F.
A1 - Mai, M.
A1 - Altmann, Korinna
A1 - Al-Sabbagh, Dominik
A1 - Schuhmann, P.
A1 - Ruhl, A.
A1 - Jekel, M.
A1 - Braun, U.
T1 - Characterization of activated carbons for water treatment using TGA‑FTIR for analysis of oxygen‑containing functional groups
N2 - Water treatment with activated carbon (AC) is an established method for the removal of organic micropollutants and natu ral organic matter. However, it is not yet possible to predict the removal of individual pollutants. An appropriate material characterization, matching adsorption processes in water, might be the missing piece in the puzzle. To this end, this study examined 25 diferent commercially available ACs to evaluate their material properties. Frequently reported analyses, including N2 adsorption/desorption, CHNS(O), point of zero charge (PZC) analysis, and X-ray photoelectron spectroscopy, were conducted on a selected subset of powdered ACs. Inorganic elements examined using X-ray fuorescence and X-ray difraction spectroscopy revealed that relative elemental contents were distinctive to the individual AC’s raw material and activation procedure. This study also is the frst to use thermogravimetric analysis (TGA) coupled to Fourier-transform infrared spectroscopy (FTIR) to conduct quantitative analyses of functional surface oxygen groups (SOGs: carboxylic acid, anhydride, lactone, phenol, carbonyl, and pyrone groups) on such a large number of ACs. The comparably economical TGA method was found to provide good surrogates for the PZC by pyrolytic mass loss up to 600 ◦C (ML600), for the oxygen content by ML1000 and for the carbon content by oxidation. Mass loss profles depict the AC’s chemistry like fngerprints. Furthermore, we found that SOG contents determined by TGA-FTIR covered a wide individual range and depended on the raw material and production process of the AC. TGA and TGA-FTIR might therefore be used to identify the suitability of a particular AC for a variety of target substances in diferent target waters. This can help practitioners to control AC use in waterworks or wastewater treatment plants.
KW - Adsorbtion
KW - Organic contaminants
KW - Temperature-programmed desorption
KW - Proximate analysis
KW - Principal component analysis
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-555506
DO - https://doi.org/10.1007/s13201-022-01723-2
SN - 2190-5495
VL - 12
SP - 1
EP - 13
PB - Springer
CY - Berlin
AN - OPUS4-55550
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dinter, Adelina-Elisa
T1 - Development of a single cell-ICP-ToF-MS-method for multielement analysis of MIC organisms grown on solid steel samples
N2 - The latest ICP-MS technology - ICP-ToF (time of flight)-MS – enables the analysis of the multi-element fingerprint of individual cells. The interface between material and environmental analysis thus receives special attention, e.g., when considering corrosion processes. Microbiologically influenced corrosion (MIC) is a highly unpredictable phenomenon due to the influence of the environment, microbial communities involved and the respective electron source. However, the interaction pathway between cells and the metal surface remains unclear. The development of the MIC-specific ICP-ToF-MS analytical method presented here at the single cell level, in combination with the investigation of steel-MIC interactions, contributes significantly to progress in instrumental MIC analysis and will enable clarification of the processes taking place. For this, a MIC-specific staining procedure was developed. It allows the analysis of archaea at a single cell level and provides information about the interaction of the cells with the staining agent which is extremely scarce compared to other well characterized organisms. Additionally, the single cell ICP-ToF-MS is used for the analysis of archaea involved in MIC of steel. Hence, the possible uptake of individual elements from different steel samples is investigated - the information obtained will be used in the future to elucidate underlying mechanisms and develop possible material protection concepts, thus combining modern methods of analytical sciences with materials.
T2 - DAAS Doktorandenseminar 2021
CY - Online meeting
DA - 20.09.2021
KW - Sc-ICP-ToF-MS
KW - Single cell analysis
KW - Microbiologically influenced corrosion
KW - Archaea
PY - 2021
AN - OPUS4-53340
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dinter, Adelina-Elisa
T1 - Development of a MIC single archaea-ICP-ToF-MS-method for analysis of various elements in solid steel samples
N2 - ICP-ToF (Flugzeitanalysator, engl. time of flight)-MS ermöglicht den Multielement Fingerabdruck einzelner Zellen (single cell) zu analysieren. Die single cell-ICP-ToF-MS kommt bei dem vorgestellten Poster bei der Analyse von Archaeen, die an mikrobiell beeinflusster Korrosion (engl. microbiologically influenced corrosion, MIC) von Stahl eine Rolle spielen, zum Einsatz. Mittels sc-ICP-ToF-MS wird die mögliche Aufnahme von einzelnen Elementen aus dem jeweiligen Stahl untersucht – die erhaltenen Informationen fließen zukünftig in die Aufklärung zugrunde liegender Mechanismen sowie Entwicklung möglicher Materialschutzkonzepte ein. Die Arbeiten Verknüpfen moderne Methoden der Analytical Sciences mit Materialien.
T2 - Tag der Chemie 2021
CY - Online meeting
DA - 06.07.2021
KW - SC-ICP-ToF-MS
KW - Single cell analysis
KW - Microbiologically influenced corrosion
KW - Archaea
PY - 2021
AN - OPUS4-52941
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dinter, Adelina-Elisa
T1 - Examination of biological samples by means of single-cell ICP-ToF-MS
N2 - Up to now, different analytical methods for single cell analysis exist focusing on key features such as size, shape, morphology and elemental composition. The combination of the latest ICP-MS techniques - ICP-ToF-MS - together with the latest developments in the field of sample delivery - micro droplet generator (MDG) – will allow a Deep insight into the composition and size of cells.
Microbiologically influenced corrosion (MIC) is an oxidation of metals affected by the presence or activity (or both) of microorganisms e.g. Shewanella Putrefaciens in biofilms on the surface of the corroding material. As this can happen for example in the soil on iron pipes of water pipes, in oil tanks or on steel sheet piling, there is great interest in MIC research, not only from various industrial sectors, but also from the environmental aspect.
T2 - SALSA - Make & Measure
CY - Online Meeting
DA - 15.10.2020
KW - SC-ICP-ToF-MS
KW - Single cell analysis
KW - MDG ICP-ToF-MS
KW - Microdroplet generator
PY - 2020
AN - OPUS4-52441
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dinter, Adelina-Elisa
T1 - Deciphering corrosion processes of MIC organisms - single cell-ICP-ToF-MS analysis of archaea on solid steels
N2 - ICP-ToF (time of flight) MS enables the analysis of the multi-element fingerprint of single cells. The single cell ICP-ToF-MS is used in the presented poster for the analysis of archaea involved in microbiologically influenced corrosion (MIC) of steel. By means of sc-ICP-ToF-MS, the possible uptake of individual elements from the respective steel is investigated - the information obtained will be used in the future to elucidate underlying mechanisms and develop possible material protection concepts. The work combines modern methods of analytical sciences with materials.
T2 - SALSA - Make & Measure 2021
CY - Online meeting
DA - 16.09.2021
KW - Sc-ICP-ToF-MS
KW - Single cell analysis
KW - Microbiologically influenced corrosion
KW - Archaea
KW - Poster presentation
PY - 2021
AN - OPUS4-53337
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dietrich, P. M.
A1 - Kjærvik, Marit
A1 - Willneff, E. A.
A1 - Unger, Wolfgang
T1 - In-depth analysis of iodine in artificial biofilm model layers by variable excitation energy XPS and argon gas cluster ion sputtering XPS
N2 - Here, we present a study on agarose thin-film samples that represent a model system for the exopolysaccharide matrix of biofilms. Povidone-iodide (PVP-I) was selected as an antibacterial agent to evaluate our x-ray photoelectron spectroscopy (XPS)-based methodology to trace specific marker elements, here iodine, commonly found in organic matrices of antibiotics. The in-depth distribution of iodine was determined by XPS analyses with variable excitation energies and in combination with argon gas cluster ion beam sputter cycles. On mixed agarose/PVP-I nanometer-thin films, both methods were found to solve the analytical task and deliver independently comparable results. In the mixed agarose/PVP-I thin film, we found the outermost surface layer depleted in iodine, whereas the iodine is homogeneously distributed in the depth region between this outermost surface layer and the interface between the thin film and the substrate. Depletion of iodine from the uppermost surface in the thin-film samples is assumed to be caused by ultrahigh vacuum exposure resulting in a loss of molecular iodine (I2) as reported earlier for other iodine-doped polymers.
KW - Biofilm
KW - XPS
KW - Argon gas cluster ion sputtering
KW - Variable excitation
KW - Iodine
PY - 2022
DO - https://doi.org/10.1116/6.0001812
SN - 1934-8630
VL - 17
IS - 3
SP - 1
EP - 8
PB - AVS
AN - OPUS4-54973
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Diehn, S.
A1 - Zimmermann, B.
A1 - Tafintseva, V.
A1 - Seifert, S.
A1 - Bagcioglu, M.
A1 - Ohlson, M.
A1 - Weidner, Steffen
A1 - Fjellheim, S.
A1 - Kohler, A.
A1 - Kneipp, Janina
T1 - Combining Chemical Information From Grass Pollen in Multimodal Characterization
N2 - The analysis of pollen chemical composition is important to many fields, including agriculture, plant physiology, ecology, allergology, and climate studies. Here, the potential of a combination of different spectroscopic and spectrometric methods regarding the characterization of small biochemical differences between pollen samples was evaluated using multivariate statistical approaches. Pollen samples, collected from three populations of the grass Poa alpina, were analyzed using Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, surface enhanced Raman scattering (SERS), and matrix assisted laser desorption/ionization mass spectrometry (MALDI-TOF MS). The variation in the sample set can be described in a hierarchical framework comprising three populations of the same grass species and four different growth conditions of the parent plants for each of the populations. Therefore, the data set can work here as a model system to evaluate the classification and characterization ability of the different spectroscopic and spectrometric methods. ANOVA Simultaneous Component Analysis (ASCA) was applied to achieve a separation of different sources of variance in the complex sample set. Since the chosen methods and sample preparations probe different parts and/or molecular constituents of the pollen grains, complementary information about the chemical composition of the pollen can be obtained. By using consensus principal component analysis (CPCA), data from the different methods are linked together. This enables an investigation of the underlying global information, since complementary chemical data are combined. The molecular information from four spectroscopies was combined with phenotypical information gathered from the parent plants, thereby helping to potentially link pollen chemistry to other biotic and abiotic parameters.
KW - Pollen
KW - MALDI-TOF MS
KW - FTIR
KW - Raman
KW - Multivariate analyses
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-504822
DO - https://doi.org/10.3389/fpls.2019.01788
VL - 10
SP - 1788
AN - OPUS4-50482
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dhamo, Lorena
A1 - Wegner, Karl David
A1 - Würth, Christian
A1 - Häusler, I.
A1 - Hodoroaba, Vasile-Dan
A1 - Resch-Genger, Ute
T1 - Assessing the influence of microwave-assisted synthesis parameters and stabilizing ligands on the optical properties of AIS/ZnS quantum dots
N2 - Luminescent semiconductor quantum dots (QDs) are frequently used in the life and material sciences as reporter for bioimaging studies and as active components in devices such as displays, light-emitting diodes, solar cells, and sensors. Increasing concerns regarding the use of toxic elements like cadmium and lead, and hazardous organic solvents during QD synthesis have meanwhile triggered the search for heavy-metal free QDs using green chemistry syntheses methods. Interesting candidates are ternary AgInS2 (AIS) QDs that exhibit broad photoluminescence (PL) bands, large effective Stokes shifts, high PL quantum yields (PL QYs), and long PL lifetimes, which are particularly beneficial for applications such as bioimaging, white light-emitting diodes, and solar concentrators. In addition, these nanomaterials can be prepared in high quality with a microwave-assisted (MW) synthesis in aqueous solution. The homogeneous heat diffusion and instant temperature rise of the MW synthesis enables a better control of QD nucleation and growth and thus increases the batch-to-batch reproducibility. In this study, we systematically explored the MW synthesis of AIS/ZnS QDs by varying parameters such as the order of reagent addition, precursor concentration, and type of stabilizing thiol ligand, and assessed their influence on the optical properties of the resulting AIS/ZnS QDs. Under optimized synthesis conditions, water-soluble AIS/ZnS QDs with a PL QY of 65% and excellent colloidal and long-term stability could be reproducible prepared.
KW - Quantum dots
KW - Microwave-assisted synthesis
KW - AgInS
KW - Aqueous synthesis
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-567091
DO - https://doi.org/10.1038/s41598-022-25498-3
SN - 2045-2322
VL - 12
IS - 1
SP - 1
EP - 11
PB - Nature Publishing Group
CY - London
AN - OPUS4-56709
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dhamo, Lorena
A1 - Carulli, F.
A1 - Nickl, Philip
A1 - Wegner, Karl David
A1 - Hodoroaba, Vasile-Dan
A1 - Würth, Christian
A1 - Brovelli, S.
A1 - Resch-Genger, Ute
T1 - Efficient luminescent solar concentrators based on environmentally friendly Cd-free ternary AIS/ZnS quantum dots
N2 - Luminescent solar concentrators (LSC) allow to obtain renewable energy from building integrated photovoltaic systems. As promising efficient and long-term stable LSC fluorophores semiconductor nanocrystals like Quantum dots (QDs) with size and composition tunable optoelectronic properties have recently emerged. The most popular II/VI or IV/VI semiconductor QDs contain, however, potentially hazardous cadmium or lead ions, which is a bottleneck for commercial applications. A simple aqueous based, microwaveassisted synthesis for environmentally friendly and highly emissive AgInS2/ ZnS QDs is developed using 3-mercaptopropionic acid (MPA) and glutathione (GSH) and their incorporation into polylaurylmethacrylate (PLMA) polymer slabs integrable in LSC devices (10.4 × 10.4 × 0.2 cm3, G = 12.98).
With this simple approach, optical power efficiencies (OPE) of 3.8% and 3.6% and optical quantum efficiencies (OQE) of 24.1% and 27.4% are obtained, which are among the highest values yet reported.
KW - Solar energy
KW - Solar concentrator
KW - Quantum dots
KW - Advanced material
KW - Quantum yield
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-529735
DO - https://doi.org/10.1002/adom.202100587
SN - 2195-1071
SN - 0935-9648
VL - 9
IS - 17
SP - 1
EP - 8
PB - Wiley-VCH
CY - Weinheim
AN - OPUS4-52973
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Devi, Sarita
A1 - Riedel, Soraya
A1 - Döring, Sarah
A1 - Hiller, Lukas
A1 - Kaliyaraj Selva Kumar, Archana
A1 - Flemig, Sabine
A1 - Singh, Chandan
A1 - Konthur, Zoltán
A1 - Hodoroaba, Vasile-Dan
A1 - Schneider, Rudolf
T1 - Antibodies Functionalized Magnetic Fe-Metal-Organic Framework Based Biosensor for Electrochemical Detection of Tetanus Neurotoxin
N2 - This work presents a metal-organic framework (MOF)-integrated microfluidic flow-cell (MFC) based immunodetection of the tetanus toxoid (TT) using electrochemical technique for the first time. The magnetic property of Fe-MOF helped to hold them on the working electrode at detection zone of MFC surpassing the requirement of additional conjugation chemistry, whereas the conductive property was utilized to observe the change in signal efficiency in the presence of TT. The one-pot hydrothermal synthesis of a magnetic and conductive iron-based MOF (Fe-MOF) was performed using the Fe3 +/Fe2+ precursors as 1.2/1 mmol and dual ligands, i.e., tetrahydroxy-1,4-benzoquinone and 2-aminobenzene-1,4-dicarboxylic acid. The Fe-MOF was conjugated with L-phenylalanine (Fe-MOF/Phe) to increase its electric conductivity owing to the enhanced electron flow rate. The human monoclonal antibody SA13 against TT (anti-TT mAb) was conjugated on the Fe-MOF/Phe surface with the help of ethylenediamine (Fe-MOF/Phe/EDA/anti-TT mAb). The binding affinity of Fe-MOF/Phe/EDA/anti-TT mAb for the TT antigen was evaluated using cyclic voltammetry technique. The limit of detection of the Fe-MOF/Phe/EDA/anti-TT mAb-based biosensor for TT was 9.4 ng/ml in spiked buffer. This study shows the applicability of these Fe-MOFs in the detection of various other microbial toxins or other biomolecules.
KW - Antikörper
KW - Elektrochemischer Immunoassay
KW - Molecular Organic Framework (MOF)
KW - Microfluidics
KW - Rekombinant
PY - 2025
DO - https://doi.org/10.1016/j.snb.2025.137381
SN - 0925-4005
VL - 431
SP - 1
EP - 12
PB - Elsevier B.V.
CY - Amsterdam
AN - OPUS4-62673
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - INPR
A1 - Devi, Sarita
A1 - Riedel, Soraya
A1 - Döring, Sarah
A1 - Hiller, Lukas
A1 - Flemig, Sabine
A1 - Singh, Chandan
A1 - Konthur, Zoltán
A1 - Hodoroaba, Vasile-Dan
A1 - Schneider, Rudolf
T1 - Antibodies Functionalized Magnetic Fe-Metal-Organic Framework Based Biosensor for Electrochemical Detection of Tetanus NeuroToxin
N2 - This work presents a MOF-integrated microfluidic flow-cell based immunodetection of the tetanus toxoid (TT) using electrochemical technique for the first time. Metal-organic frameworks (MOFs) are coordination polymers, and composed of a metal center and organic linkers. Several synthesis methods have been reported to achieve the desired properties in MOFs. In this work, we report the hydrothermal synthesis of a magnetic and conductive iron-based MOF (Fe-MOF) which was utilized to develop a biosensor in conjugation with the human monoclonal antibody SA13 against TT (anti-TT mAb) for the detection of the tetanus neurotoxin (TeNT). The one-pot synthesis of this magnetic and conductive Fe-MOF was performed in a hydrothermal reactor (108℃) using the Fe3+/Fe2+ precursors as 1.2/1 mmol and dual ligands, i.e., tetrahydroxy-1,4-benzoquinone and 2-aminobenzene-1,4-dicarboxylic acid. The Fe-MOF was characterized using XRD, DLS, FTIR, and electron microscopy. The Fe-MOF was further conjugated with L-phenylalanine (pH 8.6) to increase the electric conductivity of the Fe-MOF (Fe-MOF/Phe) on the screen-printed gold electrode as studied by cyclic voltammetry (CV). The anti-TT mAb was conjugated on the Fe-MOF/Phe surface with the help of ethylenediamine (Fe-MOF/Phe/EDA/anti-TT mAb) delivered good binding affinity for the TT antigen revealing the applicability of this biosensor for TT detection by CV. The limit of detection of the Fe-MOF/Phe/EDA/anti-TT mAb-based biosensor for TT was 9.4 ng/ml in spiked buffer. There is negligible cross-reactivity in the presence of bovine serum albumin. This study shows the applicability of magnetic MOFs in the detection of various other microbial toxins or other biomolecules.
KW - Magnetic Metal-Organic Framework
KW - Tetanus toxoid
KW - L-phenylalanine
KW - Antibody
KW - Label-free detection
KW - Electrochemical immunosensor
PY - 2024
DO - https://doi.org/10.2139/ssrn.4935745
SP - 1
EP - 48
PB - Elsevier Inc.
AN - OPUS4-62196
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Deumer, J.
A1 - Pauw, Brian Richard
A1 - Marguet, S.
A1 - Skroblin, D.
A1 - Taché, O.
A1 - Krumrey, M.
A1 - Gollwitzer, C.
T1 - Small-angle X-ray scattering: characterization of cubic Au nanoparticles using Debye’s scattering formula
N2 - A versatile software package in the form of a Python extension, named CDEF (computing Debye’s scattering formula for extraordinary form factors), is proposed to calculate approximate scattering profiles of arbitrarily shaped nanoparticles for small-angle X-ray scattering (SAXS). CDEF generates a quasi-randomly distributed point cloud in the desired particle shape and then applies the open-source software DEBYER for efficient evaluation of Debye’s scattering formula to calculate the SAXS pattern (https://github.com/j-from-b/CDEF). If self-correlation of the scattering signal is not omitted, the quasi-random distribution provides faster convergence compared with a true-random distribution of the scatterers, especially at higher momentum transfer. The usage of the software is demonstrated for the evaluation of scattering data of Au nanocubes with rounded edges, which were measured at the four-crystal monochromator beamline of PTB at the synchrotron radiation facility BESSY II in Berlin. The implementation is fast enough to run on a single desktop computer and perform model fits within minutes. The accuracy of the method was analyzed by comparison with analytically known form factors and verified with another implementation, the SPONGE, based on a similar principle with fewer approximations. Additionally, the SPONGE coupled to McSAS3 allows one to retrieve information on the uncertainty of the size distribution using a Monte Carlo uncertainty estimation algorithm.
KW - X-ray scattering
KW - SAXS
KW - Non-spherical nanoparticles
KW - Nanoparticles
KW - Nanomaterials
KW - Debye scattering equation
KW - Simulation
KW - Data fitting
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-557652
DO - https://doi.org/10.1107/S160057672200499X
VL - 55
IS - Pt 4
SP - 993
EP - 1001
PB - International Union of Crystallography
CY - Chester, England
AN - OPUS4-55765
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - del Rocío Silva-Calpa, Leydi
A1 - de Souza Bernardes, Andrelaine
A1 - de Avillez, Roberto Ribeiro
A1 - Smales, Glen J.
A1 - Camarena, Mariella Alzamora
A1 - Ramos Moreira, Carla
A1 - Zaitsev, Volodymyr
A1 - Archanjo, Braulio Soares
A1 - Letichevsky, Sonia
T1 - From support to shell: An innovative design of air-stable nano zero-valent iron–nickel catalysts via structural self-assembly
N2 - This work presents the design of air-stable core–shell zero-valent iron–nickel nanofilaments supported on silica and zeolite, developed to overcome the oxidation limitations of nano zero-valent iron in environmental catalysis. The nanofilaments feature ∼ 100 nm iron–nickel cores surrounded by ultrafine iron-rich threads embedded with aluminates and silicates, originating from partial support dissolution during synthesis. By varying the iron reduction time, three catalysts were prepared: one on silica reduced for 30 min, and two on zeolite reduced for 30 and 15 min. They were thoroughly characterized using nitrogen physisorption, X-ray diffraction, electron microscopy with elemental analysis, Mössbauer spectroscopy, and small-angle X-ray scattering. The zeolite-supported catalyst reduced for 15 min showed the highest activity for hexavalent chromium reduction (rate constant 8.054 min−1), attributed to a higher fraction of reactive iron–nickel phases formed under shorter reduction. Its tailored core–shell structure improves air stability and surface reactivity, highlighting its potential as a next-generation zero-valent iron nanocatalyst for aqueous remediation
KW - nanofilaments
KW - Core–shell nanostructures
KW - Air-stable nanomaterials
KW - Structure-controlled FeNi nanoparticles
KW - Hexavalent chromium reduction
KW - X-ray scattering
KW - MOUSE
PY - 2025
DO - https://doi.org/10.1016/j.mtcomm.2025.114142
SN - 2352-4928
VL - 49
SP - 1
EP - 15677
PB - Elsevier Ltd.
AN - OPUS4-65087
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - del Giorgio, Elena
T1 - Visible and NIR emissive lanthanide(III) surfaces for new luminescent materials
N2 - Luminescent lanthanides(III) offer exceptional optical properties that can overcome issues often encountered with other fluorophores (e.g. organic dyes). Their long lifetimes up to milliseconds, low photobleaching and sharp and characteristic emission peaks make the lanthanides extremely valuable for the development of advanced luminescent materials. Previous work on Ru(II) and Ir(III) gold surfaces further highlights the potential of employing the luminescence of metal complexes for the fabrication of sensing platforms and devices.
Here, we incorporate visible and NIR-emitting lanthanide(III) complexes Ln2L3 (Ln = Eu(III), Nd(III), Yb(III)) to gold and plasmonic surfaces, translating the unique optical properties of the lanthanides(III) to practical devices. The Ln2L3 complexes are deposited on the surfaces with different methods, ranging from polymer aided physisorption to the covalent attachment on the gold surface. Furthermore, we exploit the high sensitivity to the coordination environment of lanthanides(III) to design and prepare a sensing platform.
T2 - 17th Conference on Methods and Applications in Fluorescence (MAF 2022)
CY - Göteborg, Sweden
DA - 11.09.2022
KW - Luminescent materials
KW - Lanthanide(III)
KW - Surface morphology
KW - AFM
KW - SEM/EDS
PY - 2022
UR - https://maf2022.com/
AN - OPUS4-56126
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Olivera, Paulo
A1 - Michalchuk, Adam
A1 - Marquardt, Julien
A1 - Feiler, Torvid
A1 - Prinz, Carsten
A1 - Torresi, R.
A1 - Camargo, P.
A1 - Emmerling, Franziska
T1 - Investigating the role of reducing agents on mechanosynthesis of Au nanoparticles
N2 - Control over the bottom up synthesis of metal nanoparticles (NP) depends on many experimental factors, including the choice of stabilising and reducing agents. By selectively manipulating these species, it is possible to control NP characteristics through solution-phase synthesis strategies. It is not known, however, whether NPs produced from mechanochemical syntheses are governed by the same rules. Using the Au NPs mechanosynthesis as a model system, we investigate how a series of common reducing agents affect both the reduction kinetics and size of Au NPs. It is shown that the relative effects of reducing agents on mechanochemical NP synthesis differ significantly from their role in analogous solution-phase reactions. Hence, strategies developed for control over NP growth in solution are not directly transferrable to environmentally benign mechanochemical approaches. This work demonstrates a clear need for dedicated, systematic studies on NP mechanosynthesis.
KW - Mechanochemistry
KW - Metal nanoparicels
PY - 2020
DO - https://doi.org/10.1039/d0ce00826e
VL - 22
IS - 38
SP - 6261
EP - 6267
PB - Royal Society of Chemistry
AN - OPUS4-51757
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Olivera, Paulo
A1 - Michalchuk, Adam
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Bienert, Ralf
A1 - Torresi, R.
A1 - Camargo, P.
A1 - Emmerling, Franziska
T1 - Tandem X-ray absorption spectroscopy and scattering for in situ time-resolved monitoring of gold nanoparticle mechanosynthesis
N2 - Current time-resolved in situ approaches limit the scope of mechanochemical investigations possible. Here we develop a new, general approach to simultaneously follow the evolution of bulk atomic and electronic structure during a mechanochemical synthesis. This is achieved by coupling two complementary synchrotron-based X-ray methods: X-ray absorption spectroscopy (XAS) and X-ray diffraction. We apply this method to investigate the bottom-up mechanosynthesis of technologically important Au micro and nanoparticles in the presence of three different reducing agents, hydroquinone, sodium citrate, and NaBH4. Moreover, we show how XAS offers new insight into the early stage generation of growth species (e.g. monomers and clusters), which lead to the subsequent formation of nanoparticles. These processes are beyond the detection capabilities of diffraction methods. This combined X-ray approach paves the way to new directions in mechanochemical research of advanced electronic materials.
KW - Mechanochemistry
KW - XANES
KW - X-ray diffraction
KW - Nano particles
PY - 2020
DO - https://doi.org/10.1039/d0cc03862h
SN - 1364-548X
VL - 56
SP - 10329
EP - 10332
PB - Royal Society of Chemistry
AN - OPUS4-51760
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Oliveira, P. F. M.
A1 - Torresi, R.
A1 - Emmerling, Franziska
A1 - Carmago, P.
T1 - Challenges and opportunities in the bottom-up mechanochemical synthesis of noble metal nanoparticles
N2 - Mechanochemistry is a promising alternative to solution-based protocols across the chemical sciences, enabling different types of chemistries in solvent-free and environmentally benign conditions. The use of mechanical energy to promote physical and chemical transformations has reached a high level of refinement, allowing for the design of sophisticated molecules and nanostructured materials. Among them, the synthesis of noble metal nanoparticles deserves special attention due to their catalytic applications. In this review, we discuss the recent progress on the development of mechanochemical strategies for the controlled synthesis of noble metal nanostructures. We start by covering the fundamentals of different preparation routes, namely top-down and bottom-up approaches. Next, we focus on the key examples of the mechanochemical synthesis of non-supported and supported metal nanoparticles as well as hybrid nanomaterials containing noble metals. In these examples, in addition to the principles and synthesis mechanisms, their performances in catalysis are discussed. Finally, a perspective of the field is given, where we discuss the opportunities for future work and the challenges of mechanochemical synthesis to produce well-defined noble metal nanoparticles.
KW - Mechanochemistry
KW - Nanoparticles
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-512080
DO - https://doi.org/10.1039/D0TA05183G
VL - 8
IS - 32
SP - 16114
AN - OPUS4-51208
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Yusenko, Kirill
A1 - Stawski, Tomasz
A1 - Kulow, Anicó
A1 - Cakir, Cafer Tufan
A1 - Röder, Bettina
A1 - Naese, Christoph
A1 - Britzke, Ralf
A1 - Sintschuk, Michael
A1 - Emmerling, Franziska
T1 - BAMline - A real-life sample materials research beamline
N2 - With increasing demand and environmental concerns, researchers are exploring new materials that can perform as well or better than traditional materials while reducing environmental impact. The BAMline, a real-life sample materials research beamline, provides unique insights into materials’ electronic and chemical structure at different time and length scales. The beamline specializes in x-ray absorption spectroscopy, x-ray fluorescence spectroscopy, and tomography experiments. This enables real-time optimization of material properties and performance for various applications, such as energy transfer, energy storage, catalysis, and corrosion resistance. This paper gives an overview of the analytical methods and sample environments of the BAMline, which cover non-destructive testing experiments in materials science, chemistry, biology, medicine, and cultural heritage. We also present our own synthesis methods, processes, and equipment developed specifically for the BAMline, and we give examples of synthesized materials and their potential applications. Finally, this article discusses the future perspectives of the BAMline and its potential for further advances in sustainable materials research.
KW - Extended X-ray absorption fine structure
KW - Energy storage
KW - Environmental impacts
KW - Nondestructive testing techniques
KW - X-ray fluorescence spectroscopy
KW - Corrosion
KW - Near edge X-ray absorption fine structure spectroscopy
KW - X-ray absorption spectroscopy
PY - 2023
DO - https://doi.org/10.1063/5.0157194
VL - 158
IS - 24
SP - 1
EP - 22
PB - AIP Publishing
AN - OPUS4-57824
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Emmerling, Franziska
ED - Rogge, Andreas
ED - Meng, Birgit
T1 - Exploring new materials for Green Intelligent Building - How can our BAMline help?
N2 - In the scope of exploring and characterizing new materials related to Green Intelligent Building (GIB), we will provide an overview of the X-ray spectroscopy and diffraction analytical methods available at the BAMline /1/. and Myspot beamlines. These are two universal beamlines at the Berlin Synchrotron BESSY-II, where BAM has access and supervision role. Overarching electronic and structural properties at different time and length scales, such measurements enable a real-time characterization of materials properties. We will show-case in situ and ex situ deterioration and hydration studies on cement-based constructure materials.
T2 - 11. Jahrestagung des DAfStb mit 63. Forschungskolloquium der BAM Green Intelligent Building
CY - Berlin, Germany
DA - 16.10.2024
KW - BAMline
KW - Scope of exploring
KW - Green intelligent building
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-612882
SN - 978-3-9818564-7-7
SP - 30
EP - 36
PB - Bundesanstalt für Materialforschung und -prüfung (BAM)
CY - Berlin
AN - OPUS4-61288
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Kulow, Anicó
A1 - Kabelitz, Anke
A1 - Grunewald, C.
A1 - Seidel, R.
A1 - Chapartegui-Arias, Ander
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Emmerling, Franziska
A1 - Beyer, S.
T1 - Observation of early ZIF-8 crystallization stages with X-ray absorption spectroscopy
N2 - The present study investigates early stages of ZIF-8 crystallization up to 5 minutes post mixing of precursor solutions. Dispersive X-ray Absorption Spectroscopy (DXAS) provides a refined understanding of the evolution of the coordination environment during ZIF-8 crystallization. Linear Combination Fiting (LCF) suggests tetrakis(1-methylimidazole)zinc2+ to be a suitable and stable mononuclear structure analogue for some early stage ZIF-8 intermediates. Our results pave the way for more detailed studies on physico-chemical aspects of ZIF-8 crystallization to better control tailoring ZIF-8 materials for specific applications.
KW - In-situ
KW - XANES
KW - ZIF-8
KW - Crystallization
PY - 2020
DO - https://doi.org/10.1039/D0SM01356K
SN - 1744-6848
VL - 17
IS - 2
SP - 331
EP - 334
PB - Royal Scociety of Chemistry
AN - OPUS4-51723
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Cakir, Cafer Tufan
A1 - Radtke, Martin
A1 - Haider, M. Bilal
A1 - Emmerling, Franziska
A1 - F. M. Oliveira, P.
A1 - Michalchuk, Adam
T1 - Dispersive x-ray absorption spectroscopy for time-resolved in situ monitoring of mechanochemical reactions
N2 - X-ray absorption spectroscopy (XAS) provides a unique, atom-specific tool to probe the electronic structure of solids. By surmounting long-held limitations of powder-based XAS using a dynamically averaged powder in a Resonant Acoustic Mixer (RAM), we demonstrate how time-resolved in situ (TRIS) XAS provides unprecedented detail of mechanochemical synthesis. The use of a custom-designed dispersive XAS (DXAS) setup allows us to increase the time resolution over existing fluorescence measurements from ∼15 min to 2 s for a complete absorption spectrum. Hence, we here establish TRIS-XAS as a viable method for studying mechanochemical reactions and sampling reaction kinetics. The generality of our approach is demonstrated through RAM-induced (i) bottom-up Au nanoparticle mechanosynthesis and (ii) the synthesis of a prototypical metal organic framework, ZIF-8. Moreover, we demonstrate that our approach also works with the addition of a stainless steel milling ball, opening the door to using TRIS-DXAS for following conventional ball milling reactions. We expect that our TRIS-DXAS approach will become an essential part of the mechanochemical tool box.
KW - In situ studies
KW - Dipsersive XAS
KW - Mechanochemistry
KW - Time-resolved
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-567659
DO - https://doi.org/10.1063/5.0130673
SN - 1089-7690
VL - 157
IS - 21
SP - 1
EP - 12
PB - American Institute of Physics
CY - Melville, NY
AN - OPUS4-56765
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - The versatility of X-ray absorption spectroscopy (XAS) for exploring new materials in collaborative research
N2 - With increasing demand and environmental concerns, researchers are exploring new materials that can perform as well or better than traditional materials while reducing environmental impact. X-ray absorption spectroscopy (XAS) enables unique atom-specific tool to probe the electronic structure of materials. The BAM plays a central role in this highly collaborative research. The BAMline, a real-life sample materials research beamline, at the Berlin Synchrotron BESSY-II, provides unique insights into materials’ electronic and chemical structure at different time and length scales. This enables real-time optimization of material properties and performance for various applications, such as energy storage and conversion, catalysis, and corrosion resistance. This talk provides an overview of the analytical methods and sample environments of the BAMline and addresses its potential for further advances in sustainable materials research.
T2 - International symposium of radiation physics (ISRP-16)
CY - Lisbon, Portugal
DA - 01.09.2024
KW - XAS
KW - Time-resolved studies
KW - Operando
KW - Corrosion
KW - Electrochemistry
PY - 2024
AN - OPUS4-60996
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Bridging Structure and Electronic State: Real-time XES–XRD Fusion for Functional Alloys
N2 - We present a unified X-ray Emission Spectroscopy (XES) and X-ray Diffraction (XRD) approach for real-time, in situ characterization of materials, demonstrated on Co₂FeSi Heusler alloys under varied heat treatments. The combination of XES and XRD is particularly well-suited to Heusler alloys, where subtle changes in atomic ordering and electronic structure (e.g. site occupancy, hybridization, and spin state) are tightly interdependent and critical for their magnetic and transport properties. In addition, this method enables more efficient materials design by reducing experimental iterations through comprehensive structural and electronic analysis. Developed at the mySpot beamline at BESSY-II, the platform integrates (a) digital twin-based experiment planning, (b) open-source XES spectral simulations, (c) an optimized single-shot, two-element XES setup with sub-pixel resolution for enhanced energy precision, and (d) result-driven beamtime utilization. With an unprecedented synchronized XES-XRD platform, we aim to shed light on how diffusion-controlled processes in Heusler alloys and double perovskites at elevated temperatures establish the formation of specific phases with distinct structure types in real time. This, in turn, strongly impacts the functional properties of the materials under scrutiny.
T2 - XLIV Colloquium Spectroscopicum Internationale
CY - Ulm, Germany
DA - 27.07.2025
KW - Multimodal
KW - X-ray spectroscopy
KW - X-ray diffraction
KW - Functional alloys
PY - 2025
AN - OPUS4-63991
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - The versatility of XAS@BAM for real-time in situ electrocatalysis in collaborative materials research
N2 - With the global push toward sustainable energy technologies, the development of efficient and durable electrocatalysts has become a research priority. Real-time in situ studies are essential to understand the dynamic behavior of catalysts under operational conditions. X-ray absorption spectroscopy (XAS) offers a unique, element-specific probe of electronic and structural changes at the active sites of electrocatalysts during electrochemical reactions.
At BAM, collaborative research efforts leverage the advanced capabilities of the BAMline at the Berlin Synchrotron BESSY-II to study electrocatalytic materials under realistic working conditions. As a dedicated materials research beamline, the BAMline enables in situ and operando XAS across different time and length scales, making it ideally suited for monitoring catalytic transformations in real time.
This presentation highlights the analytical strengths and sample environments developed for electrochemical cells at BAM, showcasing their application to electrocatalysis for energy conversion (e.g., water splitting, CO₂ reduction). Emphasis will be placed on how these insights contribute to the rational design and real-time optimization of functional materials for a sustainable energy future.
T2 - MATSUS Konferenz
CY - Valencia, Spanien
DA - 20.10.2025
KW - Operando
KW - XAS
KW - In situ
KW - Electrocatalysis
PY - 2025
AN - OPUS4-64493
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - The versatility of X-ray absorption spectroscopy (XAS) for exploring new materials in collaborative research
N2 - From Physics Engineer at FCUL in Lisbon to senior scientist at the Federal Institute for Materials Research and Testing (BAM) in Berlin, Germany. In this seminar, a personal journey using X-rays as a tool to probe different types of materials will be given. Examples of applications relevant to our society demonstrate how versatile and useful X-rays are
T2 - Forschungsseminar an der FCUL (Univesity of Lisbon)
CY - Online meeting
DA - 25.10.2024
KW - XAS
KW - Time-resolved studies
KW - Operando
KW - Corrosion
KW - Electrochemistry
PY - 2024
AN - OPUS4-61597
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Time resolved in situ monitoring of mechanochemical transformations by X-ray spectroscopy (XAS)
N2 - Mechanochemical reactions promise a new direction for environmentally benign preparation of materials, and has been dubbed by IUPAC as one of the 10 chemical innovations that will change our world. Despite this significant promise, very little is known about the mechanisms that drive mechanochemical transformations, posing significant barriers to realizing their full potential. To this end, there is growing need to follow mechanochemical reactions in situ and in real time. We here describe advances in the development and application of XAS methods to monitor material synthesis in real time under mechanochemical conditions. We demonstrate the generality of our approaches by describing mechanochemical syntheses of materials by both vibratory ball milling and by Resonant Acoustic Mixing (RAM), where a time resolution of 1 second is for a whole XAS spectrum was achieved. Moreover, we describe how spectroscopic methods can be coupled to diffraction-based approaches, thereby providing new dimensions in understanding mechanochemical synthesis.
T2 - Denver X-ray Conference: DXC 2021
CY - Online meeting
DA - 02.08.2021
KW - Dispersive XAS
KW - Mechanochemistry
KW - Time resolved
KW - In situ
PY - 2021
AN - OPUS4-56257
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Time resolved in situ monitoring of mechanochemical transformations by X-ray absorption spectroscopy (XAS)
N2 - Mechanochemical reactions promise a new direction for environmentally benign preparation of materials, and has been dubbed by IUPAC as one of the 10 chemical innovations that will change our world. Despite this significant promise, very little is known about the mechanisms that drive mechanochemical transformations, posing significant barriers to realizing their full potential. To this end, there is growing need to follow mechanochemical reactions in situ and in real time. We here describe advances in the development and application of XAS methods to monitor material synthesis in real time under mechanochemical conditions. We demonstrate the generality of our approaches by describing mechanochemical syntheses of materials by both vibratory ball milling and by Resonant Acoustic Mixing (RAM), where a time resolution of 1 second is for a whole XAS spectrum was achieved. Moreover, we describe how spectroscopic methods can be coupled to diffraction-based approaches, thereby providing new dimensions in understanding mechanochemical synthesis.
T2 - Advances X ray Analytics Seminar at TU Berlin
CY - Berlin, Germany
DA - 14.06.2022
KW - XAS
KW - Mechanochemistry
KW - Time resolved
KW - In situ
PY - 2022
AN - OPUS4-56259
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Time resolved in situ monitoring of mechanochemical transformations by X-ray spectroscopy (XAS)
N2 - Mechanochemical reactions promise a new direction for environmentally benign preparation of materials, and has been dubbed by IUPAC as one of the 10 chemical innovations that will change our world. Despite this significant promise, very little is known about the mechanisms that drive mechanochemical transformations, posing significant barriers to realizing their full potential. To this end, there is growing need to follow mechanochemical reactions in situ and in real time. We here describe advances in the development and application of XAS methods to monitor material synthesis in real time under mechanochemical conditions. We demonstrate the generality of our approaches by describing mechanochemical syntheses of materials by both vibratory ball milling and by Resonant Acoustic Mixing (RAM), where a time resolution of 1 second is for a whole XAS spectrum was achieved. Moreover, we describe how spectroscopic methods can be coupled to diffraction-based approaches, thereby providing new dimensions in understanding mechanochemical synthesis.
T2 - AfLS3
CY - Online meeting
DA - 14.11.2021
KW - Dipsersive XAS
KW - Mechanochemistry
KW - Time-resolved
KW - In situ
PY - 2021
AN - OPUS4-56256
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Exploring new materials for Green Intelligent Building how can our BAMline help
N2 - With increasing demand and environmental concerns, researchers are exploring new materials that can perform as well or better than traditional materials while reducing environmental impact. Synchrotron X-ray based methods enable unique tools to probe materials properties via e.g. X-ray spectroscopy and diffraction methods. The BAM plays a central role in this highly collaborative research. The BAMline, a real-life sample materials research beamline, at the Berlin Synchrotron BESSY-II, provides unique insights into materials’ electronic and chemical structure at different time and length scales1. This enables real-time optimization of material properties and performance for various applications, such as energy storage and conversion, catalysis, and deterioration resistance.
T2 - DAfStb-Kolloquium
CY - Berlin, Germany
DA - 16.10.2024
KW - XAS
KW - Time-resolved studies
KW - Binding materials
KW - Cements
PY - 2024
AN - OPUS4-61616
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Time resolved in situ monitoring of mechanochemical transformations by X-ray absorption spectroscopy (XAS)
N2 - Mechanochemical reactions promise a new direction for environmentally benign preparation of materials, and has been dubbed by IUPAC as one of the 10 chemical innovations that will change our world. Despite this significant promise, very little is known about the mechanisms that drive mechanochemical transformations, posing significant barriers to realizing their full potential. To this end, there is growing need to follow mechanochemical reactions in situ and in real time. We here describe advances in the development and application of XAS methods to monitor material synthesis in real time under mechanochemical conditions. We demonstrate the generality of our approaches by describing mechanochemical syntheses of materials by both vibratory ball milling and by Resonant Acoustic Mixing (RAM), where a time resolution of 1 second is for a whole XAS spectrum was achieved. Moreover, we describe how spectroscopic methods can be coupled to diffraction-based approaches, thereby providing new dimensions in understanding mechanochemical synthesis.
T2 - European Conference on X-ray Spectrometry 2022
CY - Bruges, Belgium
DA - 27.06.2022
KW - XAS
KW - Mechanochemictry
KW - Time resolved
KW - In situ
PY - 2022
AN - OPUS4-56258
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de Oliveira Guilherme Buzanich, Ana
T1 - Recent developments of X-ray absorption spectroscopy as analytical tool for biological and biomedical applications
N2 - X-ray absorption spectroscopy (XAS), in its various modalities, has gained exponential attention and applicability in the field of biological and biomedical systems. Particularly in this field, challenges like low concentration of analyte or proneness to radiation damage have certainly settle the basis for further analytical developments, when using X-ray based methods. Low concentration calls for higher sensitivity—by increasing the detection limits (DL); while susceptibility for radiation damage requires shorter measurement times and/or cryogenic sample environment possibilities. This manuscript reviews the latest analytical possibilities that make XAS more and more adequate to investigate biological or biomedical systems in the last 5 years.
KW - Biological & biomedical applications
KW - TXRF-XAS
KW - HERFD-XAS
KW - RXES
KW - Quick-XAS
KW - Dispersive-XAS
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-531206
DO - https://doi.org/10.1002/xrs.3254
SN - 0049-8246
VL - 51
IS - 3
SP - 1
EP - 10
PB - John Wiley & Sons Ltd
AN - OPUS4-53120
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - de O. Primo, J.
A1 - Horsth, D.F.
A1 - de S. Correa, J.
A1 - Das, A.
A1 - Bittencourt, C.
A1 - Umek, P.
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Radtke, Martin
A1 - Yusenko, Kirill
A1 - Zanetta, C.
A1 - Anaissi, F.J.
T1 - Synthesis and Characterization of Ag/ZnO Nanoparticles for Bacteria Disinfection in Water
N2 - n this study, two green synthesis routes were used for the synthesis of Ag/ZnO nanoparticles, using cassava starch as a simple and low-cost effective fuel and Aloe vera as a reducing and stabilizing agent. The Ag/ZnO nanoparticles were characterized and used for bacterial dis-
infection of lake water contaminated with Escherichia coli (E. coli). Characterization indicated the formation of a face-centered cubic structure of metallic silver nanoparticles with no insertion of Ag into the ZnO hexagonal wurtzite structure. Physicochemical and bacteriological analyses described in “Standard Methods for the Examination of Water and Wastewater” were used to evaluate the efficiency of the treatment. In comparison to pure ZnO, the synthesized Ag/ZnO nanoparticles showed high efficiencies against Escherichia coli (E. coli) and general coliforms present in the lake
water. These pathogens were absent after treatment using Ag/ZnO nanoparticles. The results indicate that Ag/ZnO nanoparticles synthesized via green chemistry are a promising candidate for the treatment of wastewaters contaminated by bacteria, due to their facile preparation, low-cost synthesis,and disinfection efficiency.
KW - Synchrotron
KW - BAMline
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-562440
DO - https://doi.org/10.3390/nano12101764
SN - 2079-4991
VL - 12
IS - 10
SP - 1
EP - 18
PB - MDPI
CY - Basel
AN - OPUS4-56244
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Davison, Nathan
A1 - Hemingway, Jack M.
A1 - Wills, Corinne
A1 - Stolar, Tomislav
A1 - Waddell, Paul G.
A1 - Dixon, Casey M.
A1 - Barron, Luke
A1 - Dawson, James A.
A1 - Lu, Erli
T1 - Mechanochemical Synthesis of a Sodium Anion Complex [Na+(2,2,2-cryptand)Na–] and Studies of Its Reactivity: Two-Electron and One-Electron Reductions
N2 - Group 1 metal molecular chemistry is dominated by a +1 oxidation state, while a 0 oxidation state is widespread in the metals. A more exotic, yet still available, oxidation state of group 1 metal is −1, i.e., alkalide. Reported as early as the 1970s, the alkalides appear in every modern inorganic chemistry textbook as an iconic chemical curiosity, yet their reactivity remains unexplored. This is due to their synthetic hurdles. In this work, we report the first facile synthesis of the archetypical alkalide complex, [Na+(2,2,2-cryptand)Na–], which allows us to unveil a versatile reactivity profile of this once exotic species.
KW - Mechanochemistry
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-608632
DO - https://doi.org/10.1021/acs.inorgchem.4c02914
VL - 63
IS - 32
SP - 15247
EP - 15258
PB - American Chemical Society (ACS)
AN - OPUS4-60863
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Das, Prasenjit
A1 - Chakraborty, Gouri
A1 - Yang, Jin
A1 - Roeser, Jérôme
A1 - Küçükkeçeci, Hüseyin
A1 - Nguyen, Anh Dung
A1 - Schwarze, Michael
A1 - Gabriel, Jose
A1 - Penschke, Christopher
A1 - Du, Shengjun
A1 - Weigelt, Vincent
A1 - Khalil, Islam E.
A1 - Schmidt, Johannes
A1 - Saalfrank, Peter
A1 - Oschatz, Martin
A1 - Rabeah, Jabor
A1 - Schomäcker, Reinhard
A1 - Emmerling, Franziska
A1 - Thomas, Arne
T1 - The Effect of Pore Functionality in Multicomponent Covalent Organic Frameworks on Stable Long‐Term Photocatalytic H2 Production
N2 - AbstractIn nature, organic molecules play a vital role in light harvesting and photosynthesis. However, regarding artificial water splitting, the research focus is primarily on inorganic semiconductors. Although organic photocatalysts have high structural variability, they tend to exhibit lower quantum efficiencies for water splitting than their inorganic counterparts. Multicomponent reactions (MCRs) offer an attractive route to introduce different functional units into covalent organic frameworks (COFs) and enable semiconducting properties and high chemical stability, creating promising materials for long‐term photocatalytic applications, such as H2 production. Herein, five highly crystalline donor‐acceptor based, 4‐substituted quinoline‐linked MCR‐COFs are presented that are prepared via the three‐component Povarov reaction. The pore functionality is varied by applying different vinyl derivatives (e.g., styrene, 2‐vinyl pyridine, 4‐vinylpyridine, 4‐vinyl imidazole, 2,3,4,5,6‐pentafluorostyrene), which has a strong influence on the obtained photocatalytic activity. Especially an imidazole‐functionalized COF displays promising photocatalytic performance due to its high surface area, crystallinity, and wettability. These properties enable it to maintain its photocatalytic activity even in a membrane support. Furthermore, such MCR‐COFs display dramatically enhanced (photo)chemical stability even after long‐term solar light irradiation and exhibit a high and steady H2 evolution for at least 15 days.
KW - Sstability
KW - Covalent organic frameworks
KW - Pore functionality
KW - Long-term H2 production
KW - Multicomponent reactions
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-639787
DO - https://doi.org/10.1002/aenm.202501193
SN - 1614-6832
SP - 1
EP - 10
PB - Wiley VHC-Verlag
AN - OPUS4-63978
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Das, Prasenjit
A1 - Chakraborty, Gouri
A1 - Friese, Nico
A1 - Roeser, Jérôme
A1 - Prinz, Carsten
A1 - Emmerling, Franziska
A1 - Schmidt, Johannes
A1 - Thomas, Arne
T1 - Heteropolyaromatic Covalent Organic Frameworks via One-Pot Multicomponent Reactions
N2 - Multicomponent reactions (MCRs) offer a platform to create different chemical structures and linkages for highly stable covalent organic frameworks (COFs). As an illustrative example, the multicomponent Povarov reaction generates 2,4-phenylquinoline from aldehydes and amines in the presence of electron-rich alkenes. In this study, we introduce a new domino reaction to generate unprecedented 2,3-phenylquinoline COFs in the presence of epoxystyrene. This work thus presents, for the first time, structural isomeric COFs produced by multicomponent domino and Povarov reactions. Furthermore, 2,3-phenylquinolines can undergo a Scholl reaction to form extended aromatic linkages. With this approach, we synthesize two thermally and chemically stable MCR-COFs and two heteropolyaromatic COFs using both domino and in situ domino and Scholl reactions. The structure and properties of these COFs are compared with the corresponding 2,4-phenylquinoline-linked COF and imine-COF, and their activity toward benzene and cyclohexane sorption and separation is investigated. The position of the pendant phenyl groups within the COF pore plays a crucial role in facilitating the industrially important sorption and separation of benzene over cyclohexane. This study opens a new avenue to construct heteropolyaromatic COFs via MCR reactions.
KW - COF
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-604038
DO - https://doi.org/10.1021/jacs.4c02551
SP - 1
EP - 9
PB - American Chemical Society (ACS)
AN - OPUS4-60403
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Das, P.
A1 - Chakraborty, Gouri
A1 - Roeser, J.
A1 - Vogl, S.
A1 - Rabeah, J.
A1 - Thomas, A.
T1 - Integrating Bifunctionality and Chemical Stability in Covalent Organic Frameworks via One-Pot Multicomponent Reactions for Solar-Driven H2O2 Production
N2 - Multicomponent reactions (MCRs) can be used to introduce different functionalities into highly stable covalent organic frameworks (COFs). In this work, the irreversible three-component Doebner reaction is utilized to synthesize four chemically stable quinoline-4-carboxylic acid DMCR-COFs (DMCR-1−3 and DMCR-1NH) equipped with an acid−base bifunctionality. These DMCR-COFs show superior photocatalytic H2O2 evolution (one of the most important industrial oxidants) compared to the imine COF analogue (Imine-1). This is achieved with sacrificial oxidants but also in pure water and under an oxygen or air atmosphere. Furthermore, the DMCR-COFs show high photostability, durability, and recyclability. MCR-COFs thus provide a viable materials’ platform for solar to chemical energy conversion.
KW - Reactions
KW - Bifunctionality
KW - Postsynthetic modification
KW - Multicomponent
PY - 2022
DO - https://doi.org/10.1021/jacs.2c11454
SN - 0002-7863
VL - 145
IS - 5
SP - 2975
EP - 2984
PB - ACS Publications
AN - OPUS4-56922
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Das, Chayanika
A1 - Kastania, Eleni
A1 - Witt, Julia
A1 - Özcan Sandikcioglu, Özlem
T1 - Corrosion protection properties of poly(4-vinyl pyridine) containing multilayer polymeric coatings on magnesium alloy AZ31
N2 - The aim of this study is to develop polymeric thin films for corrosion protection of magnesium alloy AZ31. As polymer matrix, poly(4-vinyl pyridine) (P4VP) is selected due to its semiconducting properties and protonic conductivity. Polyacrylic acid is tested as crosslinking layers to improve interfacial adhesion. The macroscopic corrosion properties of the multilayer coatings are investigated by means of electrochemical methods, such as linear sweep voltammetry and electrochemical impedance spectroscopy (EIS), in corrosive media simulating technical and biomedical applications. It is demonstrated that thin multilayer coatings can suppress the corrosion rates of magnesium alloys. To our best knowledge, this is the first demonstration of the use of P4VP as a conducting polymer film with protonic conductivity for corrosion protection of magnesium alloys.
KW - Multilayercoatings
KW - AZ31
KW - Corrosion protection
KW - Intrinsically conducting polymers
KW - Magnesium alloys
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-551799
DO - https://doi.org/10.1002/maco.202112708
SN - 0947-5117
VL - 73
IS - 3
SP - 427
EP - 435
PB - Wiley VHC-Verlag
AN - OPUS4-55179
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Darvishi Kamachali, Reza
A1 - Wallis, Theophilus
A1 - Ikeda, Yuki
A1 - Saikia, U.
A1 - Ahmadian, A.
A1 - Liebscher, C.
A1 - Hickel, Tilmann
A1 - Maaß, Robert
T1 - Giant segregation transition as origin of liquid metal embrittlement in the Fe-Zn system
N2 - A giant Zn segregation transition is revealed using CALPHAD-integrated density-based modeling of segregation into Fe grain boundaries (GBs). The results show that above a threshold of only a few atomic percent Zn in the alloy, a substantial amount of up to 60 at.% Zn can segregate to the GB. We found that the amount of segregation abruptly increases with decreasing temperature, while the Zn content in the alloy required for triggering the segregation transition decreases. Direct evidence of the Zn segregation transition is obtained using high-resolution scanning transmission electron microscopy. Base on the model, we trace the origin of the segregation transition back to the low cohesive energy of Zn and a miscibility gap in Fe-Zn GB, arising from the magnetic ordering effect, which is confirmed by ab-initio calculations. We also show that the massive Zn segregation resulting from the segregation transition greatly assists with liquid wetting and reduces the work of separation along the GB. The current predictions suggest that control over Zn segregation, by both alloy design and optimizing the galvanization and welding processes, may offer preventive strategies against liquid metal embrittlement.
KW - CALPHAD
KW - Microstructure Design
KW - Grain boundary engineering
KW - Steels
KW - Density-based Model
KW - Segregation Engineering
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-584292
DO - https://doi.org/10.1016/j.scriptamat.2023.115758
SN - 1359-6462
SN - 1872-8456
VL - 238
SP - 1
EP - 5
PB - Elsevier
CY - Amsterdam
AN - OPUS4-58429
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dalgic, Mete‐Sungur
A1 - Kumar, Sourabh
A1 - Weidner, Steffen
T1 - Quantitative Analysis of Polymers by MALDI‐TOF Mass Spectrometry: Correlation Between Signal Intensity and Arm Number
N2 - The signal intensities of linear and star‐shaped poly(L‐lactides) (PLA) and poly (ethylene oxides) (PEO) were compared to determine the influence of the number of arms on the ionization in matrix‐assisted laser desorption/ionization time‐of‐flight (MALDI‐TOF) mass spectrometry. In this study, a variety of blends were prepared and investigated, including binary and ternary combinations of linear and star‐shaped polymers with similar molecular masses. The focus was on examining their intensity ratios. In equimolar binary PLA blends, polymer stars were observed to exhibit higher intensities than their linear counterparts. This result was supported by experiments with equimolar ternary PLA blends, which clearly demonstrated an intensity dependence on the number of polymer arms. It was observed that four‐arm PLA exhibited higher intensities than three‐arm PLA. A similar trend was observed in investigations involving acetylated polymer end groups, suggesting that differences in ionization are primarily influenced by polymer architecture rather than end groups. In order to validate this assumption, the binding energies for [polymer‐K] + adduct ions utilizing the most stable geometry obtained from GOAT (Global Optimizer Algorithm) were calculated, revealing that star‐shaped lower mass oligomers have slightly higher binding energies.
KW - MALDI-TOF MS
KW - Starlike polymers
KW - Quantification
KW - Topology
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-653401
DO - https://doi.org/10.1002/jms.70023
SN - 1076-5174
VL - 61
IS - 1
SP - 1
EP - 12
PB - John Wiley & Sons Ltd.
AN - OPUS4-65340
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dalgic, Mete-Sungur
A1 - Weidner, Steffen
T1 - Solvent-free sample preparation for matrix-assisted laserdesorption/ionization time-of-flight mass spectrometry ofpolymer blends
N2 - Solvent-free sample preparation offers some advantages over solvent-based techniques, such as improved accuracy, reproducibility and sensitivity, for matrix-assisted laser desorption/ionization (MALDI) analysis. However, little or no information is available on the application of solvent-free techniques for the MALDI analysis of polymer blends. Solvent-free sample preparation by ball milling was applied with varying sample-to-matrix ratios for MALDI time-of-flight mass spectrometry analysis of various polymers, including polystyrenes, poly(methyl methacrylate)s and poly(ethylene glycol)s. The peak intensity ratios were compared with those obtained after using the conventional dried droplet sample preparation method. In addition, solvent-assisted milling was also applied to improve sample homogeneities.
Depending on the sample preparation method used, different peak intensity ratios were found, showing varying degrees of suppression of the signal intensities of higher mass polymers. Ball milling for up to 30 min was required to achieve constant intensity ratios indicating homogeneous mixtures. The use of wet-assisted grinding to improve the homogeneity of the blends was found to be disadvantageous as it caused partial degradation and mass-dependent segregation of the polymers in the vials.The results clearly show that solvent-free sample preparation must be carefully considered when applied to synthetic polymer blends, as it may cause additional problems with regard to homogeneity and stability of the blends.
KW - MALDI TOF MS
KW - Sample preparation
KW - Polymer blends
KW - Solvent-free
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-598570
DO - https://doi.org/10.1002/rcm.9756
SN - 0951-4198
VL - 38
IS - 12
SP - 1
EP - 9
PB - Wiley online library
AN - OPUS4-59857
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dalgic, Mete-Sungur
T1 - Lösemittelfreie Probenpräparation zur Untersuchung von Polymerblends mittels MALDI-TOF MS
N2 - Die Probenpräparation ist ein wichtiger Schritt für die Qualität der Massenspektren in MALDI-TOF MS. Es werden Polymerproben, die lösungsmittelbasiert und lösungsmittelfrei präpariert worden sind, verglichen. Dabei werden die Intensitätsverhältnisse von ternären Mischungen von PEG-, PS- und PMMA-Polymeren beachtet.
T2 - 28. Kolloquium - Massenspektrometrische Techniken zur Untersuchung synthetischer Polymere
CY - Berlin, Germany
DA - 14.05.2024
KW - Polymere
KW - Massenspektrometrie
KW - Probenpräparation
PY - 2024
AN - OPUS4-60032
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dalgic, Mete-Sungur
T1 - Discrimination effects in MALDI-MS of Ternary Polymer Mixtures
N2 - MALDI-TOF MS is a viable method to determine molecular weights of polymers. However, quantification using MALDI-TOF MS presents specific challenges due to intensity biases caused by instrumental and sample-specific parameters. In this presentation, the influence of molar masses on MALDI-TOF mass spectra is explored. The intensities of a ternary PMMA blend with different mixture ratios are depicted in contour plots.
T2 - SALSA Make and Measure 2022
CY - Berlin, Germany
DA - 15.09.2022
KW - MALDI-TOF MS
KW - Ternary polymer blends
KW - PMMA
PY - 2022
AN - OPUS4-62212
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dalgic, Mete-Sungur
T1 - Einfluss der Konformation auf das Ionisationsverhalten in MALDI-TOF MS
N2 - MALDI-TOF Massenspektrometrie ist eine wichtige Methode zur Bestimmung von Molekulargewichten von Polymeren. Jedoch wird die quantitative Analyse von Polymeren durch verschiedene Faktoren erschwert. In dieser Präsentation wird unter anderem der Einfluss der molaren Massen auf die Massenspektren näher betrachtet. Dabei werden Konturplots von ternären PMMA- und PS-Mischungen gezeigt.
T2 - 27. Kolloquium - Massenspetrometrische von Polymeren
CY - Berlin, Germany
DA - 09.05.2023
KW - MALDI-TOF MS
KW - Ternäre Polymermischungen
KW - PMMA und PS
PY - 2023
AN - OPUS4-62214
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dal Molin, E. S.
A1 - Henning, L. M.
A1 - Müller, J. T.
A1 - Smales, Glen Jacob
A1 - Pauw, Brian Richard
A1 - Bekheet, M. F.
A1 - Gurlo, A.
A1 - Simon, U.
T1 - Robocasting of ordered mesoporous silica‐based monoliths: Rheological, textural, and mechanical characterization
N2 - Hierarchically porous, high‐surface‐area silica materials are excellent candidates for multiple applications like catalysis and environmental remediation. Shaping these materials with additive manufacturing (AM) techniques, like robocasting, could enable their use with the benefit of on‐demand, customized shaping and maximizing performance. Herein, ordered mesoporous silica COK‐12 slurries were robocasted into monoliths, containing different ratios of uncalcined COK‐12 and sodium bentonite (0–25 wt.%). The rheology of the mixed slurries is characterized by lower flow indexes (0.69 vs. 0.32) and higher yield stresses (96 vs. 259 Pa) compared to pure COK‐12 ones. Monoliths were printed in woodpile structures and calcined at 600°C. Micro‐CT measurements showed a linear shrinkage of 25% after calcination. Mechanical characterization showed increased uniaxial strength (0.20 ± 0.07 to 1.0 ± 0.3 MPa) with increasing binder/solids ratio from 13 to 25%. The amorphous, mesoporous structure of COK‐12 was retained. The structures exhibited open porosities of 52 ± 4% and showed higher specific mesopore volumes, and increased average mesopore size (6 vs. 8 nm) compared to COK‐12. Small‐angle x‐ray scattering analysis revealed an increased lattice parameter (10.3 vs. 11.0 nm) and reduced wall thickness (3.1 nm vs. 4.1 nm) of the COK‐12 in the monoliths. These properties indicate suitability for their application as porous supports and adsorbents.
KW - Industrial and Manufacturing Engineering
KW - Additive manufacturing
KW - OMS
KW - Porous materials
KW - Robocasting
KW - X-ray scattering
KW - MOUSE
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-582503
DO - https://doi.org/10.1002/nano.202300109
VL - 4
IS - 11-12
SP - 615
EP - 631
PB - Wiley-VCH GmbH
AN - OPUS4-58250
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Dailey, L. A.
A1 - Altmann, Korinna
A1 - Ćirković Veličković, Tanja
T1 - Exposition und Detektionstechniken: Der Weg zur Harmonisierung
N2 - Der Vortrag gibt einen Überblick über Erkenntnisse der WG 1 und WG 3 des CUSP Clusters der Horizon Europe Projekte von Mikroplastik (2020-2025). Die Frage ist wie hoch ist die Exposition und ist das dann eine gesundheitliche Gefahr. Diskutiert werden Mechanismen, die helfen richtig und genau zu messen, z.B. Prozesskontrollen oder Referenzmaterialien. Es wird ein Weg zu mehr Harmonisierung im Bereich der Mikroplastik-Analytik aufgezeigt.
T2 - Mikroplastik – Was wissen wir heute? BfR-Forum Verbraucherschutz
CY - Berlin, Germany
DA - 02.12.2025
KW - Microplastics
KW - Reference materials
KW - Harmonisation
PY - 2025
AN - OPUS4-65330
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - da Silva, D.A.
A1 - Greiser, Sebastian
A1 - Contro, J.
A1 - Medeiros, V.L.
A1 - Nery, J.G.
A1 - Jäger, Christian
T1 - 1H, 29Si and 119Sn double and triple resonance NMR spectroscopy of the
small-pore framework sodium stannosilicate Na2SnSi3O9⋅2H2O
N2 - The small-pore framework sodium stannosilicate AV-10, chemical composition Na2SnSi3O9⋅2H2O and known crystallographic structure, was synthesized by hydrothermal crystallization. This stannosilicate is built up of a three-dimensional network of corner-shared SiO4 tetrahedra and SnO6 octahedra. The SnO6 sites are linked to six SiO4 tetrahedra (Sn(6Si)) while each of the two crystallographically different SiO4 units are connected to two SnO6 and SiO4 units (Si(2Si,2Sn)). This material was used as model compound for developing a solid-state MAS NMR strategy aimed on the challenges and possibilities for structural studies, particularly considering the short and medium range order to verify the connectivity of SiO4 and SnO6 of such compounds despite the low natural abundances of 4.68% for 29Si and 8.59% for 119Sn nuclei as a real challenge. 29Si{119Sn} and 119Sn{29Si} REDOR (Rotational-Echo Double-Resonance) NMR measurements after 1H cross-polarization (CP) were carried out. The REDOR curves show a significant change after the “normal” quadratic short time evolution from which both (i) the shortest internuclear 29Si – 119Sn distances (and vice versa) and (ii) the number of corner-sharing SiO4 tetrahedra around the SnO6 octahedra (and vice versa) can be obtained. Based on these data, optimized 29Si {119Sn} and 119Sn{29Si} REPT-HMQC (Recoupled Polarization Transfer-Heteronuclear Multiple-Quantum Correlation, again after 1H CP) experiments were implemented, which directly show those heterogroup connectivity as correlation peaks in a 2D spectrum. This information was also obtained using 2D29Si{119Sn}-J-Coupling NMR experiments. Furthermore, 2D29Si INADEQUATE NMR experiments are also feasible, showing the connectivity of SiO4 tetrahedra. The combination of REDOR, REPT-HMQC, J-Coupling and INADEQUATE experiments yielded a complete analysis of the short and medium range structure of this microporous stannosilicate, in agreement with the previously published structure obtained Ab Initio from powder X-Ray diffraction data (XRD).
KW - Stannosilicates
KW - REDOR
KW - REPT-HMQC
KW - INADEQUATE
PY - 2020
DO - https://doi.org/10.1016/j.ssnmr.2020.101661
SN - 0926-2040
VL - 107
SP - 101661
PB - Elsevier Inc.
AN - OPUS4-50710
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Czuban, M.
A1 - Kulka, M. W.
A1 - Wang, L.
A1 - Koliszak, A.
A1 - Achazi, K.
A1 - Schlaich, C.
A1 - Donskyi, Ievgen
A1 - Di Luca, M.
A1 - Mejia Oneto, J. M.
A1 - Royzen, M.
A1 - Haag, R.
A1 - Trampuz, A.
T1 - Titanium coating with mussel inspired polymer and bio-orthogonal chemistry enhances antimicrobial activity against Staphylococcus aureus
N2 - Implant-associated infections present severe and difficult-to-treat complications after surgery, related to implant biofilm colonization. Systemic administration of antibiotics cannot reach sufficient concentrations at the infected site and may be toxic. Here we describe how mussel-inspired dendritic material coated on a titanium surface can locally activate a prodrug of daptomycin (pro-dapto) to treat methicillin-resistant Staphylococcus aureus. The mechanism of the prodrug activation is based on bio-orthogonal click chemistry between a tetrazine (Tz) and trans-cyclooctene (TCO). The former is attached to the dendritic polymer, while the later converts daptomycin into a prodrug. Characterization of the material's properties revealed that it is hydrophobic, non-toxic, and stable for a prolonged period of time. We envision that the titanium coated dendritic material will be able to improve the treatment of implant-associated infections by concentrating systemically administered antibiotic prodrugs, thus converting them into active localized medicines.
KW - Bio-orthogonal chemistry
KW - Antimicrobial titanium coating
KW - Prodrug antibiotic
KW - Antibiotic delivery
KW - Antibiotic release
KW - XPS
PY - 2020
DO - https://doi.org/10.1016/j.msec.2020.111109
VL - 116
SP - 111109
PB - Elsevier B.V.
AN - OPUS4-51204
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Czerski, Jakub
A1 - Mitoraj-Krolikowska, Marzena
A1 - Godlewska, Elzbieta
A1 - Wetzel, Annica
A1 - Witt, Julia
A1 - Özcan Sandikcioglu, Özlem
A1 - Marzec, Mateusz
A1 - Goly, Marcin
T1 - Corrosion and passivation of AlCrFe2Ni2Mox high-entropy alloys in sulphuric acid
N2 - Corrosion behaviour of AlCrFe2Ni2Mox (x = 0.0, 0.1, 0.15, 0.3 and 0.6) high-entropy alloys was investigated in a 0.1 M H2SO4 solution. Passive films formed upon anodic polarisation, built of Al-based inner layer and (Cr, Fe, Mo)-based outer layer, had good protective properties. In particular, they prevented corrosion of the (Al, Ni)-rich BCC-B2 phase, which was observed under open-circuit conditions. Moderate amounts of Mo, up to x = 0.3, positively affected the passivation ability of AlCrFe2Ni2. Significant changes in microstructure and phase composition of the alloy at higher Mo concentrations (x = 0.6) resulted in deterioration of its corrosion resistance.
KW - EIS
KW - Alloy
KW - Sulphuric acid
KW - AFM
KW - Acid corrosion
KW - Passive films
PY - 2024
DO - https://doi.org/10.1016/j.corsci.2024.111855
SN - 0010-938X
VL - 229
SP - 1
EP - 17
PB - Elsevier Ltd.
AN - OPUS4-59703
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cubero, A.
A1 - Martínez, E.
A1 - Angurel, L.A.
A1 - de la Fuente, G.F.
A1 - Navarro, R.
A1 - Legall, Herbert
A1 - Krüger, Jörg
A1 - Bonse, Jörn
T1 - Effects of laser-induced periodic surface structures on the superconducting properties of Niobium
N2 - It is well known that the use of ultrashort (fs) pulsed lasers can induce the generation of (quasi-) periodic nanostructures (LIPSS, ripples) on the surface of many materials. Such nanostructures have also been observed in sample’s surfaces irradiated with UV lasers with a pulse duration of 300 ps. In this work, we compare the characteristics of these nanostructures on 1-mm and on 25-μm thick niobium sheets induced by 30 fs n-IR and 300 ps UV pulsed lasers. In addition to conventional continuous or burst mode processing configurations, two-dimensional laser beam and line scanning modes have been investigated in this work. The latter allows the processing of large areas with a more uniform distribution of nanostructures at the surface. The influence of the generated nanostructures on the superconducting properties of niobium has also been explored. For this aim, magnetic hysteresis loops have been measured at different cryogenic temperatures to analyse how these laser treatments affect the flux pinning behaviour and, in consequence, the superconductor’s critical current values. It was observed that laser treatments are able to modify the superconducting properties of niobium samples.
T2 - E-MRS Spring Meeting 2019
CY - Nice, France
DA - 27.05.2019
KW - Superconductivity
KW - Laser-induced periodic surface structures (LIPSS)
KW - Niobium
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-502541
DO - https://doi.org/10.1016/j.apsusc.2019.145140
SN - 0169-4332
SN - 1873-5584
VL - 508
IS - 1
SP - 145140-1
EP - 145140-7
PB - Elsevier
CY - Amsterdam
AN - OPUS4-50254
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cubero, A.
A1 - Martínez, E.
A1 - Angurel, L.A.
A1 - de la Fuente, G.F.
A1 - Navarro, R.
A1 - Legall, Herbert
A1 - Krüger, Jörg
A1 - Bonse, Jörn
T1 - Surface superconductivity changes of niobium sheets by femtosecond laser-induced periodic nanostructures
N2 - Irradiation with ultra-short (femtosecond) laser beams enables the generation of sub-wavelength laser-induced periodic surface structures (LIPSS) over large areas with controlled spatial periodicity, orientation, and depths affecting only a material layer on the sub-micrometer scale. This study reports on how fs-laser irradiation of commercially available Nb foil samples affects their superconducting behavior. DC magnetization and AC susceptibility measurements at cryogenic temperatures and with magnetic fields of different amplitude and orientation are thus analyzed and reported. This study pays special attention to the surface superconducting layer that persists above the upper critical magnetic field strength Hc2, and disappears at a higher nucleation field strength Hc3. Characteristic changes were distinguished between the surface properties of the laser-irradiated samples, as compared to the corresponding reference samples (non-irradiated). Clear correlations have been observed between the surface nanostructures and the nucleation field Hc3, which depends on the relative orientation of the magnetic field and the surface patterns developed by the laser irradiation.
KW - Niobium
KW - Surface superconductivity
KW - Laser-induced periodic surface structures (LIPSS)
KW - Nanostructures
PY - 2020
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-518462
DO - https://doi.org/10.3390/nano10122525
SN - 2079-4991
VL - 10(12)
IS - Special issue "Laser-generated periodic nanostructures"
SP - 1
EP - 16
PB - MDPI
CY - Basel
AN - OPUS4-51846
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Crouzier, L.
A1 - Feltin, N.
A1 - Delvallée, A.
A1 - Pellegrino, Francesco
A1 - Maurino, V.
A1 - Cios, Grzegorz
A1 - Tokarski, T.
A1 - Salzmann, Christoph
A1 - Deumer, J.
A1 - Gollwitzer, C.
A1 - Hodoroaba, Vasile-Dan
T1 - Correlative analysis of the dimensional properties of bipyramidal titania nanoparticles by complementing electron microscopy with other methods
N2 - In this paper, the accurate determination of the size and size distribution of bipyramidal anatase nanoparticles (NPs) after deposition as single particles on a silicon substrate by correlative Scanning Electron Microscopy (SEM) with Atomic Force Microscopy (AFM) analysis is described as a new measurement procedure for metrological purposes. The knowledge of the exact orientation of the NPs is a crucial step in extracting the real 3D dimensions of the particles. Two approaches are proposed to determine the geometrical orientation of individual nano‐bipyramides: (i) AFM profiling along the long bipyramid axis and (ii) stage tilting followed by SEM imaging. Furthermore, a recently developed method, Transmission Kikuchi Diffraction (TKD), which needs preparation of the crystalline NPs on electron‐transparent substrates such as TEM grids, has been tested with respect to its capability of identifying the geometrical orientation of the individual NPs. With the NPs prepared homogeneously on a TEM grid, the transmission mode in a SEM, i.e., STEM‐in‐SEM (or T‐SEM), can be also applied to extract accurate projection dimensions of the nanoparticles from the same sample area as that analysed by SEM, TKD and possibly AFM. Finally, Small Angle X‐ray Scattering (SAXS) can be used as an ensemble technique able to measure the NPs in liquid suspension and, with ab‐initio knowledge of the NP shape from the descriptive imaging techniques, to provide traceable NP size distribution and particle concentration.
KW - Nanoparticles
KW - Complex-shape
KW - Bipyramid
KW - Electron microscopy
KW - AFM
KW - Size measurements
KW - TKD
KW - STEM-in-SEM
KW - SAXS
KW - Nanoparticle concentration
KW - Correlative analysis
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-539888
DO - https://doi.org/10.3390/nano11123359
SN - 2079-4991
VL - 11
IS - 12
SP - 1
EP - 19
PB - MDPI
CY - Basel
AN - OPUS4-53988
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Costache, F.
A1 - Valette, S.
A1 - Bonse, Jörn
T1 - Editorial: Special Issue “Dynamics and Processes at Laser-Irradiated Surfaces—A Themed Issue in Honor of the 70th Birthday of Professor Jürgen Reif”
N2 - The Special Issue “Dynamics and Processes at Laser-irradiated Surfaces” is dedicated to the 70th birthday of Jürgen Reif, retired full professor, former Chair of Experimental Physics II of the Faculty of Physics of the Brandenburg University of Technology Cottbus—Senftenberg in Germany.
KW - Laser ablation
KW - Laser-induced periodic surface structures (LIPSS)
KW - Surface functionalization
KW - Femtosecond laser
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-569482
DO - https://doi.org/10.3390/nano13030611
SN - 2079-4991
VL - 13
IS - 3
SP - 1
EP - 3
PB - MDPI
CY - Basel
AN - OPUS4-56948
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cosimi, Andrea
A1 - Stöbener, Daniel D.
A1 - Nickl, Philip
A1 - Schusterbauer, Robert
A1 - Donskyi, Ievgen
A1 - Weinhart, Marie
T1 - Interfacial nanoengineering of hydrogel surfaces via block copolymer self-assembly
N2 - Synthetic polymer hydrogels are valuable matrices for biotransformations, drug delivery, and soft implants. While the bulk properties of hydrogels depend on chemical composition and network structure, the critical role of interfacial features is often underestimated. This work presents a nanoscale modification of the gel−water interface using polymer brushes via a straightforward “grafting-to” strategy, offering an alternative to more cumbersome “grafting-from” approaches. Functional block copolymers with photoreactive anchor blocks are successfully self-assembled and UV-immobilized on hydrogel substrates despite their low solid content (<30 wt %). This versatile technique works on both bulk- and surface-immobilized hydrogels, demonstrated on poly(hydroxypropyl acrylate), poly(N-isopropylacrylamide), and alginate gels, allowing precise control over grafting density. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry revealed a homogeneous bilayered architecture. By “brushing-up”, the hydrogels’ interface can be tailored to enhance protein adsorption, improve cell adhesion, or impair the diffusive uptake of small molecules into the bulk gels. This effective interfacial nanoengineering method is broadly applicable for enhancing hydrogel performance across a wide range of applications.
KW - Brushing-up
KW - Benzophenone
KW - LCTS-type polymer
KW - Poly(glycidyl ether) (PGE)
KW - Fibroblast adhesion
KW - XPS
KW - ToF-SIMS
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-652966
DO - https://doi.org/10.1021/acsami.4c18632
SN - 1944-8244
VL - 17
IS - 6
SP - 10073
EP - 10086
PB - American Chemical Society (ACS)
CY - Washington, DC
AN - OPUS4-65296
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - INPR
A1 - Corrao, Elena
A1 - Gouasmi, Meriem
A1 - Sordello, Fabrizio
A1 - Hodoroaba, Vasile-Dan
A1 - Radnik, Joerg
A1 - Maurino, Valter
A1 - Pellegrino, Francesco
T1 - Tailoring TiO2 Morphology and Surface Chemistry for Optimized Photocatalytic Activity in rGO Hybrids
N2 - TiO2–reduced graphene oxide (rGO) hybrids were investigated in this study to elucidate how TiO2 morphology and surface chemistry govern charge-transfer pathways and, ultimately, reaction selectivity. Three anatase TiO2 nanostructures were compared: bipyramids predominantly exposing {101} facets (bipy) and two nanosheet-like samples enriched in {001} facets, either fluorinated (n-sh) or thermally defluorinated and {101}-enriched (n-sh_873K). A constant rGO loading (2 wt.%) was introduced via in situ hydrazine reduction of graphene oxide in the presence of TiO2. Photocatalytic activity was evaluated under Xe-lamp irradiation in two model reactions probing oxidative and reductive pathways: phenol degradation and H2 evolution using formic acid as a scavenger. rGO systematically enhanced phenol degradation for all morphologies, with bipy+rGO showing the highest activity. In contrast, H2 evolution was consistently suppressed upon rGO incorporation across all TiO2 samples, although the bipyramidal morphology remained the most active within each series. These results highlight that facet exposure and surface functionalization dictate the beneficial or detrimental role of rGO depending on the targeted photocatalytic pathway.
KW - Photocatalytic activity
KW - Reduced graphene oxide
KW - TiO2
KW - Surface chemistry
KW - 2D materials
PY - 2026
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-653476
DO - https://doi.org/10.26434/chemrxiv-2026-65917
SP - 1
EP - 12
PB - American Chemical Society (ACS)
AN - OPUS4-65347
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - CONF
A1 - Cornelsen Sampaio Kling, I.
A1 - Pauw, Brian Richard
A1 - Agudo Jácome, Leonardo
A1 - Archanjo, B. S.
A1 - Simão, R. A.
T1 - Development and characterization of starch film and the incorporation of silver nanoparticles
N2 - Starch is one of the biopolymers being used for bioplastic synthesis. For production, starch can be combined with different plasticizers, starches from different plant sources and even with nanomaterials to improve or to add film properties. The challenge of adding these, e.g. in the form of silver nanoparticles (AgNp) is to determine the concentration so as to avoid impairing the properties of the film, agglomeration or altering the visual characteristics of the film. In this study, a starch film synthesis route and the incorporation of silver nanoparticles has been proposed in order not to alter the properties of the film while maintaining the transparency and a clear colour of the starch film. The results showed that the proposed synthesis route is promising, efficient, reproducible, fast and the film has good mechanical properties.
T2 - Semana MetalMat & Painal PEMM 2020
CY - Online meeting
DA - 23.11.2020
KW - Biofilm
KW - Silver nanoparticle
KW - Starch
KW - Starch nanoparticle
PY - 2020
SP - 1
EP - 2
AN - OPUS4-51940
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cordsmeier, Leo
A1 - Hahn, Marc Benjamin
T1 - DNA Stability in Biodosimetry, Pharmacy and DNA Based Data-Storage: Optimal Storage and Handling Conditions
N2 - DNA long-term stability and integrity is of importance for applications in DNA based bio-dosimetry, data-storage, pharmaceutical quality-control, donor insemination and DNA based functional nanomaterials. Standard protocols for these applications involve repeated freeze-thaw cycles of the DNA, which can cause detrimental damage to the nucleobases, as well as the sugar-phosphate backbone and therefore the whole molecule. Throughout the literature three hypotheses can be found about the underlying mechanisms occurring during freeze-thaw cycles. It is hypothesized that DNA single-strand breaks during freezing can be induced by mechanical stress leading to shearing of the DNA molecule, by acidic pH causing damage through depurination and beta elimination or by the presence of metal ions catalyzing oxidative damage via reactive oxygen species (ROS). Here we test these hypotheses under well defined conditions with plasmid DNA pUC19 in high-purity buffer (1xPBS) at physiological salt and pH 7.4 conditions, under pH 6 and in the presence of metal ions in combination with the radical scavengers DMSO and Ectoine. The results show for the 2686 bp long plasmid DNA, that neither mechanical stress, nor pH 6 lead to degradation during repeated freeze-thaw cycles. In contrast, the presence of metal ions (Fe2+) leads to degradation of DNA via the production of radical species.
KW - DNA
KW - DNA stability
KW - Pharmacy
KW - Reference material
KW - pUC19
KW - Strand break
KW - SSB
KW - Dosimetry
KW - Biodosimetry
KW - Biologisches Dosimeter
KW - DNA Dosimeter
KW - Quality control
KW - Plasmid DNA
KW - DNA data storage
KW - Nucleobase
KW - Base damage
KW - Base loss
KW - DNA degradation
KW - Metal ions
KW - ROS
KW - OH radical
KW - Fenton Reaction
KW - H2O2
KW - DNA based data storage
KW - Freezing
KW - Thawing
KW - Mechanical stress
KW - pH
KW - Beta elimination
KW - Ectoine
KW - Ectoin
KW - THP(B)
KW - Radical scavenger
KW - DMSO
KW - Buffer
KW - lN2
KW - DNA vortexing
KW - AGE
KW - SYBR Gold
KW - Gel electrophoresis
KW - DNA long term storage
KW - DNA reference material
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-557148
DO - https://doi.org/10.1002/cbic.202200391
SP - 1
EP - 9
PB - Wiley-VCH GmbH
AN - OPUS4-55714
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Cope, Elana J.
A1 - Bustamante, Joana
A1 - Johnson, Zöe M.
A1 - Lancaster, Alicia
A1 - Gurunathan, Ramya
A1 - George, Janine
A1 - Agne, Matthias T.
T1 - Heat capacity estimation of complex materials for energy technologies
N2 - The control of heat in energy materials is one of the greatest current engineering challenges. Accurate estimations of heat capacity are key in creating and using materials safely and efficiently. Current models for heat capacity are often limited due to crude estimations of the phonon density of states, which is a key component of the thermodynamic definition of heat capacity. Utilization of a more detailed phonon density of states, which can easily be obtained from machine-learned algorithms, combined with dilation and electronic contributions, yields heat capacity estimations that are 29% better than the widely utilized Debye model and are comparable to state-of-the-art quantum mechanical calculations. The framework and necessary tools for heat capacity estimations demonstrated herein can be built into more detailed models and analyses, such as high-throughput characterization, transport models, or other thermodynamic assessments. Consequently, the so-called vibrational + dilation + electronic (VDE) model of heat capacity developed in this work better enables the informed design of next-generation devices.
KW - Materials Design
KW - Heat Capacity
KW - Machine learning potentials
KW - Thermal Management
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-645711
DO - https://doi.org/10.1016/j.joule.2025.102054
SN - 2542-4351
VL - 9
IS - 8
SP - 1
EP - 12
PB - Elsevier Inc.
AN - OPUS4-64571
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Coburger, Peter
A1 - de Oliveira Guilherme Buzanich, Ana
A1 - Emmerling, Franziska
A1 - Abbenseth, Josh
T1 - Combining geometric constraint and redox non-innocence within an ambiphilic PBiP pincer ligand
N2 - The first pincer ligand featuring a strictly T-shaped pnictogen donor moiety was synthesised. The PBiP ligand's redox activity facilitates unprecedented ambiphilic bonding of the Bi centre with transition metals through the Bi(6p) orbital.
KW - EXAFS
KW - Pincer Ligand
KW - Group 15 metals
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-611113
DO - https://doi.org/10.1039/D4SC00197D
SN - 2041-6520
SP - 1
EP - 8
PB - Royal Society of Chemistry (RSC)
AN - OPUS4-61111
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Clifford, C.
A1 - Stintz, M.
A1 - Hodoroaba, Vasile-Dan
A1 - Unger, Wolfgang
A1 - Fujimoto, T.
ED - Hodoroaba, Vasile-Dan
ED - Unger, Wolfgang
ED - Shard, A. G.
T1 - International standards in nanotechnologies
N2 - This chapter provides an overview of what standards are, why they are important, and how they are developed. There is a focus on the work of standards committees relevant to nanotechnology measurement and characterization with tables detailing the standards that are currently available for a large number of different techniques, materials, and applications at the nanoscale.
KW - Standards
KW - Nanotechnology
KW - Reproducibility
KW - ISO
KW - CEN
KW - VAMAS
PY - 2020
SN - 978-0-12-814182-3
DO - https://doi.org/10.1016/B978-0-12-814182-3.00026-2
SP - 511
EP - 525
PB - Elsevier
CY - Amsterdam
AN - OPUS4-50165
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -