TY - JOUR
A1 - Martin-Sanchez, Pedro Maria
A1 - Miller, A. Z.
A1 - Garcia-Sanchez, A. M.
A1 - Martin-Sanchez, Pedro Maria
A1 - F.C. Pereira, M.
A1 - Afonso, M. J.
A1 - Saiz-Jimenez, C.
A1 - Spangenberg, J. E.
A1 - Jurado, V.
A1 - Dionísio, A.
A1 - Chaminé, H. I.
A1 - Hermosin, B.
T1 - Origin of abundant moonmilk deposits in a subsurface granitic environment
N2 - Subsurface granitic environments are scarce and poorly investigated. A multi-disciplinary approach was used to characterize the abundant moonmilk deposits and associated microbial communities coating the granite walls of the 16th Century Paranhos spring water tunnel in Porto city (north-west Portugal). It is possible that this study is the first record of moonmilk in an urban subsurface granitic environment. The morphology and texture, mineralogical composition, stable isotope composition and microbial diversity of moonmilk deposits have been studied to infer the processes of moonmilk formation. These whitish secondary mineral deposits are composed of very fine needle fibre calcite crystals with different morphologies and density. Calcified filaments of fungal hyphae or bacteria were distinguished by field emission scanning electron microscopy. Stable isotope analysis revealed a meteoric origin of the needle fibre calcite, with an important contribution of atmospheric CO2, soil respiration and HCO3 − from weathering of Ca-bearing minerals. The DNA-based analyses revealed the presence of micro-organisms related to urban contamination, including Actinobacteria, mainly represented by Pseudonocardia hispaniensis, Thaumarchaeota and Ascomycota, dominated by Cladosporium. This microbial composition is consistent with groundwater pollution and contamination sources of the overlying urban area, including garages, petrol stations and wastewater pipeline leakage, showing that the Paranhos tunnel is greatly perturbed by anthropogenic activities. Whether the identified micro-organisms are involved in the formation of the needle fibre calcite or not is difficult to demonstrate, but this study evidenced both abiotic and biogenic genesis for the calcite moonmilk in this subsurface granitic environment.
KW - Biomineralization
KW - Carbonate precipitation
KW - Granite
KW - Moonmilk
KW - Needle fibre calcite
PY - 2017
UR - https://onlinelibrary.wiley.com/doi/full/10.1111/sed.12431
DO - https://doi.org/10.1111/sed.12431
SN - 1365-3091
VL - 65
IS - 2
SP - 1482
EP - 1503
PB - Wiley
AN - OPUS4-43622
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Dreßler, Martin
A1 - Röllig, Mathias
A1 - Schmidt, Martin
A1 - Maturilli, A.
A1 - Helbert, J.
T1 - Temperature distribution in powder beds during 3D printing
N2 - Purpose – This purpose of this paper is to report about the temperature distribution in metal and ceramic powder beds during 3D printing. The differing powders are thoroughly characterized in terms of thermal conductivity, thermal diffusivity, emissivity spectra and density.
Design/methodology/approach – The temperature distribution was measured in a 3D printing appliance (Prometal R1) with the help of thin thermocouples (0.25 mm diameter) and thermographic imaging. Temperatures at the powder bed surface as well as at differing powder bed depths were determined. The thermal conductivity, thermal diffusivity and emissivity spectra of the powders were measured as well. Numerical simulation was used to verify the measured temperatures.
Findings – The ceramic powder heated up and cooled down more quickly. This finding corresponds well with numerical simulations based on measured values for thermal conductivity and thermal diffusivity as well as emissivity spectra. An observed color change at the metal powder has only little effect on emissivity in the relevant wavelength region.
Research limitations/implications – It was found that thermocouple-based temperature measurements at the powder bed surface are difficult and these results should be considered with caution.
Practical implications – The results give practitioners valuable information about the transient temperature evolution for two widely used but differing powder systems (metal, ceramic). The paramount importance of powder bed porosity for thermal conductivity was verified. Already small differences in thermal conductivity, thermal diffusivity and hence volumetric heat capacity lead to marked differences in the transient temperature evolution.
Originality/value – The paper combines several techniques such as temperature measurements, spectral emissivity measurements, measurements of thermal conductivity and diffusivity and density measurements. The obtained results are put into a numerical model to check the obtained temperature data and the other measured values for consistency. This approach illustrates that determinations of surface temperatures of the powder beds are difficult.
KW - Rapid prototypes
KW - Printers
KW - Heat transfer
KW - Powders
KW - Ceramics
KW - Metals
PY - 2010
DO - https://doi.org/10.1108/13552541011065722
SN - 1355-2546
VL - 16
IS - 5
SP - 328
EP - 336
PB - MCB University Press
CY - Bradford
AN - OPUS4-22002
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Tuma, Dirk
A1 - Lozano-Martín, D.
A1 - Vega-Maza, D.
A1 - Moreau, A.
A1 - Martín, M. C.
A1 - Segovia, J. J.
T1 - Speed of sound data, derived perfect-gas heat capacities, and acoustic virial coefficients of a calibration standard natural gas mixture and a low-calorific H2-enriched mixture
N2 - This work aims to address the technical aspects related to the thermodynamic characterization of natural gas mixtures blended with hydrogen for the introduction of alternative energy sources within the Power-to-Gas framework. For that purpose, new experimental speed of sound data are presented in the pressure range between (0.1 up to 13) MPa and at temperatures of (260, 273.16, 300, 325, and 350) K for two mixtures qualified as primary calibration standards: a 11 component synthetic natural gas mixture (11 M), and another low-calorific H2-enriched natural gas mixture with a nominal molar percentage x(H2) = 3 %.
Measurements have been gathered using a spherical acoustic resonator with an experimental expanded (k = 2) uncertainty better than 200 parts in 106 (0.02 %) in the speed of sound. The heat capacity ratio as perfect-gas gammapg, the molar heat capacity as perfect-gas Cp,m pg, and the second betaa and third gammaa acoustic virial coefficients are derived from the speed of sound values. All the results are compared with the reference mixture models for natural gas-like mixtures, the AGA8-DC92 EoS and the GERG-2008 EoS, with Special attention to the impact of hydrogen on those properties. Data are found to be mostly consistent within the model uncertainty in the 11 M synthetic mixture as expected, but for the hydrogen-enriched mixture in the limit of the model uncertainty at the highest measuring pressures.
KW - Natural gas mixtures
KW - Speed-of-sound measurements
KW - Equations of state
KW - Acoustic virial coefficients
PY - 2021
DO - https://doi.org/10.1016/j.jct.2021.106434
SN - 0021-9614
VL - 158
SP - 106434
PB - Elsevier Ltd.
CY - Amsterdam
AN - OPUS4-52292
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Segovia, J. J.
A1 - Tuma, Dirk
A1 - Lozano-Martín, D.
A1 - Moreau, A.
A1 - Martín, M. C.
A1 - Vega-Maza, D.
T1 - Speed of sound data and acoustic virial coefficients of two binary (N2 + H2) mixtures at temperatures between (260 and 350) K and at pressures between (0.5 and 20) MPa
N2 - This work aims to address the technical concerns related to the thermodynamic characterization of gas mixtures blended with hydrogen for the implementation of hydrogen as a new energy vector. For this purpose, new experimental speed of sound measurements have been done in gaseous and supercritical phases of two binary mixtures of nitrogen and hydrogen using the most accurate technique available, i.e., the spherical acoustic resonator, yielding an experimental expanded (k = 2) uncertainty of only 220 parts in 106 (0.022%). The measurements cover the pressure range between (0.5 and 20) MPa, the temperature range between (260 and 350) K, and the composition range with a nominal mole percentage of hydrogen of (5 and 10) mol%, respectively.
From the speed of sound data sets, thermophysical properties that are relevant for the characterization of the mixture, namely the second βa and third γa acoustic virial coefficients, are derived. These results are thoroughly compared and discussed with the established reference mixture models valid for mixtures of nitrogen and hydrogen, such as the AGA8-DC92 EoS, the GERG-2008 EoS, and the recently developed adaptation of the GERG-2008 EoS, here denoted GERG-H2_improved EoS. Special attention has been given to the effect of hydrogen concentration on those properties, showing that only the GERG-H2_improved EoS is consistent with the data sets within the experimental uncertainty in most measuring conditions.
KW - Speed of sound
KW - Acoustic resonance
KW - Binary gas mixture
PY - 2022
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-551482
DO - https://doi.org/10.1016/j.jct.2022.106791
SN - 0021-9614
VL - 171
SP - 1
EP - 13
PB - Elsevier B. V.
CY - Amsterdam
AN - OPUS4-55148
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - López de Ipina, J.-M.
A1 - Arevalillo, A.
A1 - Martín, A.
A1 - Caillard, B.
A1 - Marcoulaki, E.
A1 - Aguerre- Charol, O.
A1 - van Duuren-Stuurman, B.
A1 - Hodoroaba, Vasile-Dan
A1 - Viitanen, A.-K.
A1 - Witters, H.
A1 - Vercauteren, S.
A1 - Persson, K.
A1 - Bard, D.
A1 - Evans, G.
A1 - Jensen, K.A.
A1 - Himly, M.
A1 - Scalbi, S.
A1 - Papin, A.
A1 - Le Bihan, O.
A1 - Kanerva, T.
A1 - Tirez, K.
A1 - Frijns, E.
A1 - Niga, P.
A1 - Eleftheriadis, K.
A1 - Travlos, A.
A1 - Geppert, M.
A1 - Himly, M.
A1 - Radnik, Jörg
A1 - Kuchenbecker, Petra
A1 - Resch-Genger, Ute
A1 - Fraboulet, I.
A1 - Bressot, C.
A1 - Rissler, J.
A1 - Gaucher, R.
A1 - Binotto, G.
A1 - Krietsch, Arne
A1 - Braun, A.
A1 - Abenet, S.
A1 - Catalan, J.
A1 - Verstraelen, S.
A1 - Manier, N.
A1 - Manzo, S.
A1 - Fransman, S.
A1 - Queron, J.
A1 - Charpentier, D.
A1 - Taxell, D.
A1 - Säämänen, A.
A1 - Brignon, J.-M.
A1 - Jovanovic, A.
A1 - Bisson, M
A1 - Neofytou, P.
T1 - EC4Safenano - Catalogue of Services
N2 - The publicly available document encapsulates the first version of the Catalogue of Services of the future EC4Safenano Centre (CoS 2019).
The CoS 2019 is structured in 12 Service Categories and 27 Service Topics, for each of the 12 categories considered. This architecture configures a 12 x 27 matrix that allows ordering the potential EC4Safenano offer in 324 types of services/groups of services.
Each type of service/group of services is described, in a simple and friendly way, by means of a specific service sheet: the EC4Safenano - Service Data Sheet (EC4-SDS). These EC4-SDSs allow structuring and summarizing the information of each service, providing the customer with a concise view of characteristics of the service and also the contact details with the service provider.
The CoS 2019 deploys a map of services consisting of a set of 100 EC4-SDSs, covering 7 of the 12 Service Categories and 17 of the 27 Service Topics.
The harmonization of services is visualized as a future necessary step in EC4Safenano, in order to strengthen the offer and provide added value to customers with a growing offer of harmonized services in future versions of the CoS.
The information contained in this document is structured in 3 main sections, as follows:
• Catalogue structure. This section describes in short the main characteristics of the CoS 2019.
• Catalogue content. This section represents the core part of the document and encapsulates the set of 100 SDSs displaying the offer proposed by the CoS 2019.
• Online Catalogue. This section describes the resources implemented by EC4Safenano to facilitate the on-line consultation of the CoS 2019 by customers and other interested parties.
KW - Nano-safety
KW - Analytical services
KW - Nanomaterials
KW - Catalogue of services
KW - EC4SafeNano
KW - European Centre
PY - 2021
UR - https://ec4safenano.eu-vri.eu/Public/Guidance
SP - 1
EP - 72
PB - EU-VRi – European Virtual Institute for Integrated Risk Management
CY - Stuttgart, Germany
AN - OPUS4-52943
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Coutinho, M.L.
A1 - Miller, A. Z.
A1 - Martin-Sanchez, Pedro Maria
A1 - Mirao, J.
A1 - Gomez-Bolea, A.
A1 - Machado-Moreira, B.
A1 - Cerqueira-Alves, L.
A1 - Jurado, V.
A1 - Saiz-Jimenez,, C.
A1 - Lima, A.
A1 - Phillips, A. J. L.
A1 - Pina, F.
A1 - Macedo, M. F.
T1 - A multiproxy approach to evaluate biocidal treatments on biodeteriorated majolica glazed tiles
N2 - The Fishing House located on the grounds of the Marquis of Pombal Palace, Oeiras, Portugal, was built in the 18th century. During this epoch, Portuguese gardens, such as the one surrounding the Fishing House, were commonly ornamented with glazed wall tile claddings. Currently, some of these outdoor tile panels are covered with dark colored biofilms, contributing to undesirable aesthetic changes and eventually inducing chemical and physical damage to the tile surfaces. Phylogenetic analyses revealed that the investigated biofilms are mainly composed of green algae, cyanobacteria and dematiaceous fungi. With the aim of mitigating biodeterioration, four different biocides (TiO2 nanoparticles, Biotin® T, Preventol® RI 80 and Albilex Biostat®) were applied in situ to the glazed wall tiles. Their efficacy was monitored by visual examination, epifluorescence microscopy and DNA-based analysis. Significant changes in the microbial community composition were observed 4 months after treatment with Preventol® RI 80 and Biotin® T. Although the original community was inactivated after these treatments, an early stage of re-colonization was detected 6 months after the biocide application. TiO2 nanoparticles showed promising results due to their self-cleaning effect, causing the detachment of the biofilm from the tile surface, which remained clean 6 and even 24 months after biocide application.
KW - Biofilm
KW - Glazed tiles
KW - Fungi
PY - 2016
DO - https://doi.org/10.1111/1462-2920.13380
SN - 1462-2912
SN - 1462-2920
VL - 18
IS - 12
SP - 4794
EP - 4816
PB - Society for Applied Microbiology and John Wiley & Sons Ltd
AN - OPUS4-37380
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Roters, F.
A1 - Aslam, A.
A1 - Bai, Y.
A1 - Büschelberger, M.
A1 - Bulert, K.
A1 - Butz, A.
A1 - Hickel, Tilmann
A1 - Jogi, T.
A1 - Klitschke, S.
A1 - Martin, M.
A1 - Meyer, L.-P.
A1 - Morand, L.
A1 - Nahshon, Y.
A1 - Radtke, N.
A1 - Saikia, Ujjal
A1 - Trondl, A.
A1 - Wessel, A.
A1 - Zierep, P.
A1 - Helm, D.
T1 - StahlDigital: Ontology-Based Workflows for the Steel Industry
N2 - The innovative strength of the steel industry is based on the mastery of microstructure–property relationships. Digital workflows can largely contribute to this aim by making the complexity of workflows reproducible and their execution user independent. In this work, the tools and workflows developed in the project StahlDigital as part of the German MaterialDigital initiative are presented and application examples are provided. A steel ontology builds the
foundation for data collection and storage as well as for the semantic description of experimental and simulation data processing workflows. A dataspace powered by the Dataspace Management System (DSMS) digitally represents such workflows and manages data along them in a Findable, Accessible, Interoperable, Reusable manner aiming to derive new knowledge. Experimental data processed via DSMS can be further evaluated and used as input for simulation workflows. The simulations included in such workflows are run by the workflow system pyiron, which has been semantically extended in StahlDigital for this purpose.
KW - Steel
KW - Rolling
KW - Multiscale simulation
KW - Ontology
KW - Workflow
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-627187
DO - https://doi.org/10.1002/adem.202402148
SN - 1527-2648
SP - 1
EP - 13
PB - Wiley VHC-Verlag
AN - OPUS4-62718
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Nilsson, R. H.
A1 - Taylor, A. F. S.
A1 - Adams, R. I.
A1 - Baschien, C.
A1 - Bengtsson-Palme, J.
A1 - Cangren, P.
A1 - Coleine, C.
A1 - Iršėnaitė, R.
A1 - Martin-Sanchez, Pedro Maria
A1 - Meyer, W.
A1 - Oh, S.-Y.
A1 - Sampaio, J. P.
A1 - Seifert, K. A.
A1 - Sklenář, F.
A1 - Stubbe, D.
A1 - Suh, S.-O.
A1 - Summerbell, R.
A1 - Svantesson, S.
A1 - Unterseher, M.
A1 - Visagie, C. M.
A1 - Weiss, M.
A1 - Woudenberg, J. HC.
A1 - Wurzbacher, C.
A1 - Van den Wyngaert, S.
A1 - Yilmaz, N.
A1 - Yurkov, A.
A1 - Kõljalg, U.
A1 - Abarenkov, K.
A1 - Daniel, H.-M.
A1 - Glassman, S. I.
A1 - Hirooka, H.
A1 - Irinyi, L.
T1 - Taxonomic annotation of public fungal ITS sequences from the built environment – a report from an April 10–11, 2017 workshop (Aberdeen, UK)
N2 - Recent DNA-based studies have shown that the built environment is surprisingly rich in fungi. These indoor fungi – whether transient visitors or more persistent residents – may hold clues to the rising levels of human allergies and other medical and building-related health problems observed globally. The taxo¬nomic identity of these fungi is crucial in such pursuits. Molecular identification of the built mycobiome is no trivial undertaking, however, given the large number of unidentified, misidentified, and technically compromised fungal sequences in public sequence databases. In addition, the sequence metadata required to make informed taxonomic decisions – such as country and host/substrate of collection – are often lacking even from reference and ex-type sequences. Here we report on a taxonomic annotation workshop (April 10–11, 2017) organized at the James Hutton Institute/University of Aberdeen (UK) to facilitate reproducible studies of the built mycobiome. The 32 participants went through public fungal ITS bar¬code sequences related to the built mycobiome for taxonomic and nomenclatural correctness, technical quality, and metadata availability. A total of 19,508 changes – including 4,783 name changes, 14,121 metadata annotations, and the removal of 99 technically compromised sequences – were implemented in the UNITE database for molecular identification of fungi (https://unite.ut.ee/) and shared with a range of other databases and downstream resources. Among the genera that saw the largest number of changes were Penicillium, Talaromyces, Cladosporium, Acremonium, and Alternaria, all of them of significant importance in both culture-based and culture-independent surveys of the built environment.
KW - Indoor mycobiome
KW - Built environment
KW - Molecular identification
KW - Fungi
KW - Taxonomy
KW - Systematics
KW - Sequence annotation
KW - Metadata
KW - Open data
PY - 2018
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-438949
DO - https://doi.org/10.3897/mycokeys.28.20887
SN - 1314-4049
SN - 1314-4057
VL - 28
SP - 65
EP - 82
PB - Pensoft Publishers
CY - Washington, DC
AN - OPUS4-43894
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Liu, Yanchen
A1 - Guilherme Buzanich, Ana
A1 - Alippi, Paola
A1 - Montoro, Luciano A.
A1 - Lee, Kug‐Seung
A1 - Jeon, Taeyeol
A1 - Weißer, Kilian
A1 - Karlsen, Martin A.
A1 - Russo, Patrícia A.
A1 - Pinna, Nicola
T1 - FeNb 2 O 6 as a High‐Performance Anode for Sodium‐Ion Batteries Enabled by Structural Amorphization Coupled with NbO 6 Local Ordering
N2 - Pseudocapacitance-type transition metal oxides have been extensively investigated as anodes for lithium-ion batteries (LIBs). Currently, they are also gaining attention for sodium-ion batteries (SIBs) due to their low volume change and safety. However, their performance in sodium storage remains limited, primarily due to the larger Na+ ion radius. Here, for the first time, an iron niobate is reported with a columbite structure as a high-performance sodium storage anode. The presence of iron triggers the loss of long-range order through disorder of the FeO6 octahedra local structure, subsequently allowing reversible sodium storage in an amorphous phase. Simultaneously, the formation of short-range ordered zigzag-chain structures within the NbO6 planes creates a “skeleton” that offers abundant active sites for pseudocapacitive ion storage and enhanced ion diffusion pathways. These characteristics of FeNb2O6 make it an effective intercalation host, offering high capacity along with fast Na+ kinetics, as demonstrated through operando and ex situ characterizations. It leads to an applicable reversible capacity (>300 mAh g−1) with a favorable average voltage of ≈0.6 V and excellent rate capability (180.4 mAh g−1 at a current density of 2 A g−1). This study provides insights into the development of intrinsically active transition metal oxides for Na+-ion intercalation.
KW - SIB
KW - XAS
KW - Sodium-ion Batteries
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-654931
DO - https://doi.org/10.1002/adma.202504100
SN - 0935-9648
VL - 37
IS - 46
SP - 1
EP - 13
PB - Wiley
AN - OPUS4-65493
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Ordavo, I.
A1 - Ihle, S.
A1 - Arkadiev, V.
A1 - Scharf, Oliver
A1 - Soltau, H.
A1 - Bjeoumikhov, A.
A1 - Bjeoumikhova, S.
A1 - Buzanich, Günter
A1 - Gubzhokov, R.
A1 - Günther, A.
A1 - Hartmann, R.
A1 - Holl, P.
A1 - Kimmel, N.
A1 - Kühbacher, M.
A1 - Lang, M.
A1 - Langhoff, N.
A1 - Liebel, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Schaller, G.
A1 - Schopper, F.
A1 - Strüder, L.
A1 - Thamm, C.
A1 - Wedell, R.
T1 - A new pnCCD-based color X-ray camera for fast spatial and energy-resolved measurements
N2 - We present a new high resolution X-ray imager based on a pnCCD detector and a polycapillary optics. The properties of the pnCCD like high quantum efficiency, high energy resolution and radiation hardness are maintained, while color corrected polycapillary lenses are used to direct the fluorescence photons from every spot on a sample to a corresponding pixel on the detector. The camera is sensitive to photons from 3 to 40 keV with still 30% quantum efficiency at 20 keV. The pnCCD is operated in split frame mode allowing a high frame rate of 400 Hz with an energy resolution of 152 eV for Mn Kα (5.9 keV) at 450 kcps. In single-photon counting mode (SPC), the time, energy and position of every fluorescence photon is recorded for every frame. A dedicated software enables the visualization of the elements distribution in real time without the need of post-processing the data. A description of the key components including detector, X-ray optics and camera is given. First experiments show the capability of the camera to perform fast full-field X-Ray Fluorescence (FF-XRF) for element analysis. The imaging performance with a magnifying optics (3×) has also been successfully tested.
KW - X-ray CCD camera
KW - pnCCD
KW - Fast X-ray imaging
KW - XRF
KW - Full-field X-ray fluorescence
KW - Elemental analysis
KW - High quantum efficiency
KW - High energy resolution
KW - Polycapillary optics
PY - 2011
DO - https://doi.org/10.1016/j.nima.2011.05.080
SN - 0168-9002
SN - 0167-5087
VL - 654
SP - 250
EP - 257
PB - North-Holland
CY - Amsterdam
AN - OPUS4-24370
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Scharf, Oliver
A1 - Ihle, S.
A1 - Ordavo, I.
A1 - Arkadiev, V.
A1 - Bjeoumikhov, A.
A1 - Bjeoumikhova, S.
A1 - Buzanich, Günter
A1 - Gubzhokov, R.
A1 - Günther, A.
A1 - Hartmann, R.
A1 - Kühbacher, M.
A1 - Lang, M.
A1 - Langhoff, N.
A1 - Liebel, A.
A1 - Radtke, Martin
A1 - Reinholz, Uwe
A1 - Riesemeier, Heinrich
A1 - Soltau, H.
A1 - Strüder, L.
A1 - Thünemann, Andreas
A1 - Wedell, R.
T1 - Compact pnCCD-based X-ray camera with high spatial and energy resolution: a color X-ray camera
N2 - For many applications there is a requirement for nondestructive analytical investigation of the elemental distribution in a sample. With the improvement of X-ray optics and spectroscopic X-ray imagers, full field X-ray fluorescence (FF-XRF) methods are feasible. A new device for high-resolution X-ray imaging, an energy and spatial resolving X-ray camera, is presented. The basic idea behind this so-called 'color X-ray camera' (CXC) is to combine an energy dispersive array detector for X-rays, in this case a pnCCD, with polycapillary optics. Imaging is achieved using multiframe recording of the energy and the point of impact of single photons. The camera was tested using a laboratory 30 µm microfocus X-ray tube and synchrotron radiation from BESSY II at the BAMline facility. These experiments demonstrate the suitability of the camera for X-ray fluorescence analytics. The camera simultaneously records 69696 spectra with an energy resolution of 152 eV for manganese Kα with a spatial resolution of 50 µm over an imaging area of 12.7 × 12.7 mm². It is sensitive to photons in the energy region between 3 and 40 keV, limited by a 50 µm beryllium window, and the sensitive thickness of 450 µm of the chip. Online preview of the sample is possible as the software updates the sums of the counts for certain energy channel ranges during the measurement and displays 2-D false-color maps as well as spectra of selected regions. The complete data cube of 264 × 264 spectra is saved for further qualitative and quantitative processing.
KW - Color X-ray camera
KW - X-ray fluorescence
KW - pnCCD
KW - Polycapillary optic
KW - Synchrotron radiation
PY - 2011
DO - https://doi.org/10.1021/ac102811p
SN - 0003-2700
SN - 1520-6882
VL - 83
IS - 7
SP - 2532
EP - 2538
PB - American Chemical Society
CY - Washington, DC
AN - OPUS4-23948
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Ahlawat, A.
A1 - Seeger, Stefan
A1 - Gottschalk, Martin
A1 - Tuch, T.
A1 - Wiedensohler, A.
T1 - Observation of systematic deviations between Faraday cup aerosol electrometers for varying particle sizes and flow rates - results of the AEROMET FCAE workshop
N2 - Condensation particle counters (CPCs) are widely used for the measurement of aerosol particle number concentrations in the size range from approximately 3 nm to 3 μm. For an SI-traceable calibration of the size-dependent counting efficiency, which is advisable on a regular basis and required in several applications, Faraday cup aerosol electrometers (FCAEs) are considered to be a suitable SI-traceable reference.While the volumetric aerosol inlet flowrate and the electrical current measurement in FCAEs can be related to respective SI references, inter-comparison exercises for FCAEs are still performed on a regular basis to establish reliable uncertainty budgets and to further investigate the influences of designs and operational parameters on comparability. This is strongly demanded in the international community of metrological institutes and aerosol calibration facilities around the world, which provide CPC calibrations. In the present study, the performance of FCAEs was investigated,using Ag test aerosol particles with a 30 nm particle diameter by varying the inlet flowrates from 0.5 l min−1 to 4 l min−1. From our experimental results, significant deviations were observed in FCAE currents at sample flowrates smaller than 1.5 l min−1. It is recommended that these discrepancies should be quantified before an FCAE is used for CPC calibration at low sample flowrates and small particle sizes in the sub-30 nm size range.
KW - Faraday cup aerosol electrometer
KW - CPC calibration
KW - Inter-comparison
KW - Aerosol measurement instruments
PY - 2021
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-531315
DO - https://doi.org/10.1088/1681-7575/ac0710
SN - 1681-7575
SN - 0026-1394
VL - 58
IS - 5
SP - 1
EP - 8
PB - Institute of Physics (IOP)
CY - Bristol, UK
AN - OPUS4-53131
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Gómez-Fernández, S.
A1 - Günther, Martin
A1 - Schartel, Bernhard
A1 - Corcuera, M. A.
A1 - Eceiza, A.
T1 - Impact of the combined use of layered double hydroxides, lignin and phosphorous polyol on the fire behavior of flexible polyurethane foams
N2 - Flexible polyurethane foams with densities of 40 ± 2 kg m−3 were prepared by combining different ecofriendly fillers such as layered double hydroxides (LDH) and kraft lignin (a byproduct of the pulp and paper industry) with a phosphorous polyol (E560) in order to study their effect on the mechanical performance and fire behavior of the foams. Two series of foams were prepared, some containing lignin or LDH separately, and some with a combination of both: one of the series was prepared without E560 (0E foam series) and the other with 5 parts per hundred of E560 polyol (5E series). The use of fillers resulted in increased viscosity of the reactive mixture, requiring higher blowing agent content in order to hold the density of the foams constant. It was observed that urea phase segregation was favored in the series of 0E foams due to their lower viscosity than the 5E series. This had consequent effects on the resilience, compression force deflection and compression set of these foams. In terms of fire behavior it was observed that while the limiting oxygen index decreased, cone calorimeter results showed that the combination of lignin, LDH and E560 decreased the heat release of the foams. In addition, the combination of fillers and E560 contributed to increase the viscosity of the pyrolysis products, preventing the dripping of the molten polymer, which is a key factor in flame propagation towards adjacent objects in fire scenarios.
KW - Ligning
KW - Foam
KW - Flexible polyurethane foam
KW - Flame retardant
PY - 2018
SN - 0926-6690
VL - 125
SP - 346
EP - 359
PB - Elsevier B.V.
AN - OPUS4-45971
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Schnell, A.
A1 - Rübner, Katrin
A1 - Seher, Julia
A1 - Müller, A.
A1 - Liebezeit, S.
A1 - Fenner, J.
A1 - Martin, F.
A1 - Pniok, N.
T1 - REALight ‐ Leichtgranulate und REA‐Gips aus feinkörnigen sulfatbelasteten Bau‐ und Abbruchabfällen
N2 - Ziel des Projekts REALight ist die Entwicklung einer Referenzanlage zur Herstellung von Leichtgranulaten (leichte Gesteinskörnungen) aus Bau‐ und Abbruchabfällen und zur Gipsrückgewinnung. Als Rohstoffe werden bisher ungenutzte oder auf niedrigem Niveau eingesetzte Bau‐ und Abbruchabfälle und industrielle Nebenprodukte verwendet. Als Produkte werden leichte Gesteinskörnungen hergestellt. Die Sulfatabtrennung durch eine thermische Zersetzung bildet die Grundlage für die zusätzliche Gewinnung von Rauchgasentschwefelungs‐Gips (REA‐Gips). Das Projekt wird im Rahmen der Fördermaßnahme „Ressourceneffiziente Kreislaufwirtschaft – Bauen und Mineralische Stoffkreisläufe (ReMin)” gefördert. ReMin ist eine Maßnahme zur Umsetzung des BMBF‐Forschungskonzepts „Ressourceneffiziente Kreislaufwirtschaft” als Teil der BMBF Strategie „Forschung für nachhaltige Entwicklung – FONA”. Ziel der Förderung ist es, den Ausbau der Kreislaufwirtschaft voranzutreiben. Im Mittelpunkt steht dabei die Bauwirtschaft mit ihrer hohen Nachfrage nach Rohstoffen und gleichzeitig großen Mengen an anfallenden mineralischen Abfällen. Am Projekt REALight sind 12 Partner aus verschiedenen Bereichen der Baustoffherstellung und ‐anwendung, Abfallaufbereitung, Verfahrenstechnik sowie Forschung und Entwicklung beteiligt.
T2 - 21. Internationale Baustofftagung (ibausil)
CY - Weimar, Germany
DA - 13.09.2023
KW - Baustoffrecycling
KW - Leichtgranulate
KW - Gips
KW - Leichte Gesteinskörnungen
KW - Drehrohrofen
KW - Recycling
KW - Mauerwerkbruch
KW - Infraleichtbeton
PY - 2023
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-591708
DO - https://doi.org/10.1002/cepa.2840
SN - 2509-7075
VL - 6
IS - 6
SP - 530
EP - 536
PB - Ernst & Sohn
CY - Berlin
AN - OPUS4-59170
LA - deu
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Martin, T.
A1 - Zimmermann, E.
A1 - Klitzsch, N.
A1 - Hördt, A.
A1 - Huisman, J. A.
A1 - Radic, T.
A1 - Kruschwitz, Sabine
T1 - Round-robin test of SIP laboratory measurements using electrical test networks
N2 - This study presents the results of an interlaboratory test designed to evaluate the accuracy of spectral induced polarization (SIP) measurements using controlled electrical test networks. The study, conducted in Germany since 2006, involved 12 research institutes, six different impedance measurement devices and four types of electrical test networks specifically designed to evaluate phase shift errors in SIP measurements. The test networks, with impedances ranging from 100 to 150 kΩ, represent high-impedance samples with different phase characteristics, and pose the measurement challenges typical of such samples, including high contact impedances and parasitic capacitances. Four key findings emerged from the study: (1) Impedance measurements across all devices showed deviations within 1 per cent over a wide frequency range (0.001–1000 Hz); (2) phase errors remained below 1 mrad up to 100 Hz for most devices, but increased at higher frequencies due to parasitic capacitances and electromagnetic coupling effects; (3) lab-specific instruments have lower phase errors than field instruments when used in a laboratory environment, primarily due to the effects of long cables and too low input impedances of the field instruments; and (4) short cables and driven shielding technology effectively minimized parasitic capacitance and improved measurement accuracy. The study highlights the usefulness of test networks in assessing the accuracy of SIP measurements and raises awareness of the various factors influencing the quality of SIP data.
KW - Induced polarization
KW - Electrical properties
KW - Electrical resistivity tomography (ERT)
PY - 2025
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-631522
DO - https://doi.org/10.1093/gji/ggaf153
SN - 0956-540X
VL - 242
IS - 1
SP - 1
EP - 13
PB - Oxford University Press (OUP)
AN - OPUS4-63152
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Martin, S.
A1 - Walnsch, A.
A1 - Nolze, Gert
A1 - Leineweber, A.
A1 - Léaux, F.
A1 - Scheuerlein, C.
T1 - The crystal structure of (Nb0.75Cu0.25)Sn-2 in the Cu-Nb-Sn system
N2 - During the processing of superconducting Nb3Sn wire, several intermediate intermetallic phases including a previously encountered Cu-Nb-Sn phase show up. The yet unknown crystal structure of this phase is now identified by a combination of different experimental techniques and database search to be of the hexagonal NiMg2 type with a proposed composition of about (Nb0.75Cu0.25)Sn2. The structure determination started from an evaluation of the lattice parameters from EBSD Kikuchi patterns from quenched material suggesting hexagonal or orthorhombic symmetry. A database search then led to the hexagonal NiMg2 type structure, the presence of which was confirmed by a Rietveld analysis on the basis of high energy synchrotron X-ray powder diffraction data. Assuming a partial substitution of Nb in orthorhombic NbSn2 by Cu, the change of the valence electron concentration provokes a structural transformation from the CuMg2 type for NbSn2 to the NiMg2 type for (Nb0.75Cu0.25)Sn2. In the previous literature the (Nb0.75Cu0.25)Sn2 phase described here has occasionally been referred to as Nausite.
KW - Electron backscatter diffraction
KW - X-ray diffraction
KW - Intermetallic compound
KW - Structure solution
KW - Superconductor
PY - 2017
DO - https://doi.org/10.1016/j.intermet.2016.09.008
SN - 0966-9795
SN - 1879-0216
VL - 80
SP - 16
EP - 21
PB - Elsevier Ltd.
AN - OPUS4-37874
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Bentrup, U.
A1 - Radnik, J.
A1 - Armbruster, U.
A1 - Martin, A.
A1 - Leiterer, Jork
A1 - Emmerling, Franziska
A1 - Brückner, A.
T1 - Linking simultaneous in situ WAXS/SAXS/Raman with Raman/ATR/UV-vis spectroscopy: comprehensive insight into the synthesis of molybdate catalyst precursors
N2 - A new setup is presented which enables simultaneous wide- and small-angle X-ray scattering (WAXS/SAXS) and Raman spectroscopic experiments during the synthesis of Mo-based mixed oxide catalyst precursors at the µ-spot beamline at the Berliner Elektronenspeicherring-Gesellschaft für Synchrotronstrahlung (BESSY). Furthermore, we report about the separate monitoring of the same reactions under comparable conditions by simultaneous combined ATR/UVvis/Raman spectroscopic measurements. For testing the performance of both experimental setups two syntheses were described comprising the precipitation of metal molybdates by mixing solutions of metal nitrates and ammonium heptamolybdate. Additionally, the effect of H3PO4 admixture on precipitation was investigated. The combined evaluation of spectroscopic and WAXS/SAXS data allows the discrimination between different molybdate species appearing in solution and precipitate. Furthermore, these molybdate species could be assigned to separate phases of different crystallinity.
KW - In situ
KW - WAXS/SAXS
KW - Raman
KW - ATR
KW - UV-vis
KW - Mixed oxide catalyst
KW - Synthesis
PY - 2009
DO - https://doi.org/10.1007/s11244-009-9309-y
SN - 1022-5528
VL - 52
IS - 10
SP - 1350
EP - 1359
PB - Springer Science + Business Media
CY - Dordrecht
AN - OPUS4-19794
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - GEN
A1 - Kautek, Wolfgang
A1 - Hertwig, Andreas
A1 - Martin, Sven
A1 - Krüger, Jörg
A1 - Lenzner, Matthias
A1 - Spielmann, C.
A1 - Lenner, M.
A1 - Bunte, J.
A1 - Puester, T.
A1 - Burmester, T.
A1 - Fiedler, A.
A1 - Heberer, E.
A1 - Brose, M.
A1 - Stingl, A.
A1 - Kiehl, P.
A1 - Hönigsmann, H.
A1 - Trautinger, F.
A1 - Grabner, G.
T1 - Safety in Femtosecond Laser Technology - Recent Results of a European Research Project (406)
T2 - International Laser Safety Conference 2003 ; ILSC 2003
CY - Jacksonville, FL, USA
DA - 2003-03-10
PY - 2003
SN - 0-912035-38-2
SP - 1(?)
EP - 10(?)
PB - Laser Institute of America
CY - Orlando, Fla.
AN - OPUS4-2259
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Szymoniak, Paulina
A1 - Kolmangadi, Mohamed A.
A1 - Böhning, Martin
A1 - Frick, B.
A1 - Apple, M.
A1 - Mole, R. A.
A1 - De Souza, N. R.
A1 - Zorn, R.
A1 - Schönhals, Andreas
T1 - Confined Segmental Diffusion in Nanophase Separated Janus Polynorbornenes as Investigated by Quasielastic Neutron Scattering
N2 - A combination of neutron time-of-flight and neutron backscattering spectroscopy was used to investigate the molecular dynamics of Janus polynorbornenes (Janus poly(tricyclononenes)) on a microscopic level.
These Janus polynorbornenes, denoted as PTCNSiOR, have a semirigid backbone with −Si(OR)3 side groups attached to it. R represents the length of the alkyl side chain. Here side chain lengths of R = 3 (propyl) and R = 8 (octyl) were considered. It is worth mentioning that these polymers have some potential as active layers in gas separation membranes, especially for the separation of higher hydrocarbons. The combination of time-of-flight and backscattering will ensure a reasonably broad time window for analysis where the incoherent intermediate scattering function SInc(q,t) is considered. Previously, it was shown by X-ray investigations that the system undergoes a nanophase separation into alkyl side chain-rich domains surrounded by a backbone-rich matrix. For PTCNSiOPr (R = 3), the alkyl side-chain-rich domains are truly isolated in the backbone-rich matrix, whereas for PTCNSiOOc (R = 8) these domains percolate through the matrix. Further, it was also previously shown that the alkyl side-chain-rich domains undergo a glass transition. The advantage of neutron scattering experiments discussed here is that besides temporal also spatial information is obtained which will allow conclusions to be drawn about the type of molecular fluctuations. At the lowest measured temperature, the decay in Sinc(q,t) is due to the methyl group rotation. The methyl group dynamics is analyzed in terms of a modified jump-diffusion in a 3-fold potential and yields to a reasonable fraction of hydrogens which contribute to the methyl group rotation. At higher temperatures, the decay in SInc(q,t) is due to both the methyl group rotation and the segmental dynamics in the alkyl side-chain-rich domains. The segmental diffusion is modeled by a sublinear diffusion. For the analysis of the scattering function SInc(q,t) of PTCNSiOPr an elastic scattering due to the immobilized backbone-rich matrix must be taken into account. The analysis reveals that the segmental dynamics is confined by the finite size of alkyl chain-rich domains and that it is intrinsically heterogeneous in nature. Both effects are more pronounced for PTCNSiOPr in comparison to those of PTCNSiOOc.
KW - Polynorbornene
KW - Quasielastic Neutron Scattering
PY - 2024
UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-608712
DO - https://doi.org/10.1021/acs.macromol.4c01045
SP - 1
EP - 14
PB - ACS Publications
AN - OPUS4-60871
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -
TY - JOUR
A1 - Resch-Genger, Ute
A1 - Pilch, A.
A1 - Würth, Christian
A1 - Kaiser, Martin
A1 - Wawrzynczyk, D.
A1 - Kurnatowska, M.
A1 - Arabasz, S.
A1 - Prorok, K.
A1 - Samoc, M.
A1 - Strek, W.
A1 - Bednarkiewicz, A.
T1 - Shaping luminescent properties of Yb3+ and Ho3+ co-doped upconverting core-shell ß-NaYF4 nanoparticles by dopant distribution and spacing
N2 - At the core of luminescence color and lifetime Tuning of rare earth doped upconverting nanoparticles (UCNPs), is the understanding of the Impact of the particle architecture for commonly used sensitizer (S) and activator (A) Ions. In this respect, a series of core@Shell NaYF4 UCNPs doped with Yb3+ and Ho3+ ions are presented here, where the same dopant concentrations are distributed in different particle architectures following the scheme: YbHo core and YbHo@..., ...@YbHo, Yb@Ho, Ho@Yb, YbHo@Yb, and Yb@YbHo core-Shell NPs. As refealed by quantitative steady-state and time-resolved luminescence studies, the relative spatial Distribution of the A and S ions in the UCNPs and their protection from surface quenching has a critical Impact on ther luminescence characteristics. Although the increased amount of Yb3+ Ions boosts UCNP Performance by amplifying the Absorption, the Yb3+ ions can also efficiently dissipate the energy stored in the material through energy Migration to the surface, thereby reducing the Overall energy Transfer Efficiency to the activator ions. The results provide yet another proof that UC Phosphor chemistry combined with materials Engineering through intentional core@shell structures may help to fine-tune the luminescence Features of UCNPs for their specific future applications in biosensing, bioimaging, photovoltaics, and Display technologies.
KW - Fluorescence
KW - Upconversion
KW - NIR
KW - Nonlinear
KW - Nanoparticle
KW - Surface chemistry
KW - Quantum yield
KW - Liftetime
KW - Nanocrystal
KW - Lanthanide
KW - Ho(III)
KW - Yb(III)
KW - Mechanism
KW - Absolute flourescence
KW - Excitation power density dependence
PY - 2017
DO - https://doi.org/10.1002/smll.201701635
SN - 1613-6810
VL - 13
IS - 47
SP - 1701635, 1
EP - 13
PB - WILEY-VCH Verlag GmbH & co. KGaA
CY - Weinheim
AN - OPUS4-43629
LA - eng
AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany
ER -