TY - JOUR A1 - Grunert, B. A1 - Saatz, Jessica A1 - Hoffmann, Katrin A1 - Appler, F. A1 - Lubjuhn, Dominik A1 - Jakubowski, Norbert A1 - Resch-Genger, Ute A1 - Emmerling, Franziska A1 - Briel, A. T1 - Multifunctional rare-earth element nanocrystals for cell labeling and multimodal imaging N2 - In this work, we describe a simple solvothermal route for the synthesis of Eu3+-doped gadolinium orthovanadate nanocrystals (Eu:GdVO4−PAA) functionalized with poly(acrylic)acid (PAA), that are applicable as cell labeling probes for multimodal cellular imaging. The Eu3+ doping of the vanadate matrix provides optical functionality, due to red photoluminescence after illumination with UV light. The Gd3+ ions of the nanocrystals reduce the T1 relaxation time of surrounding water protons, allowing these nanocrystals to act as a positive MRI contrast agent with a r1 relaxivity of 1.97 mM−1 s−1. Low background levels of Eu3+, Gd3+, and V5+ in biological systems make them an excellent label for elemental microscopy by Laser Ablation (LA)-ICP-MS. Synthesis resulted in polycrystalline nanocrystals with a hydrodynamic diameter of 55 nm and a crystal size of 36.7 nm, which were further characterized by X-ray diffraction (XRD), photoluminescence spectroscopy (PL) and transmission electron microscopy (TEM). The multifunctional nanocrystals were subsequently used for intracellular labeling of both human adipose-derived stem cells (MSCs) and A549 (adenocarcinomic human alveolar basal epithelial) cells. KW - Bioimaging KW - Nanoparticle KW - Multimodal KW - Lanthanide PY - 2018 DO - https://doi.org/10.1021/acsbiomaterials.8b00495 SN - 2373-9878 VL - 4 IS - 10 SP - 3578 EP - 3587 PB - ACS Publications CY - Washington, USA AN - OPUS4-46244 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Braun, U. T1 - Monitoring von Mikroplastik N2 - Der Vortrag gibt einen Überblick was bei der Analyse von Mikroplastik zu beachten ist und beschreibt die Vor- und Nachteile der TED-GC/MS. T2 - Abschlusstreffen MikroPlaTas CY - Online meeting DA - 23.06.2021 KW - Mikroplastik KW - TED-GC/MS KW - Mikroplastik-Analytik PY - 2021 AN - OPUS4-52916 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Unger, R. A1 - Braun, Ulrike A1 - Fankhänel, J. A1 - Daum, B. A1 - Arash, B. A1 - Rolfes, R. T1 - Molecular modelling of epoxy resin crosslinking experimentally validated by near-infrared spectroscopy N2 - Reliable simulation of polymers on an atomistic length scale requires a realistic representation of the cured material. A molecular modelling method for the curing of epoxy systems is presented, which is developed with respect to efficiency while maintaining a well equilibrated system. The main criterion for bond formation is the distance between reactive groups and no specific reaction probability is prescribed. The molecular modelling is studied for three different mixing ratios with respect to the curing evolution of reactive Groups and the final curing stage. For the first time, the evolution of reactive groups during the curing process predicted by the molecular modelling is validated with near-infrared spectroscopy data, showing a good agreement between simulation results and experimental measurements. With the proposed method, deeper insights into the curing mechanism of epoxy systems can be gained and it allows us to provide reliable input data for molecular Dynamics simulations of material properties. KW - Epoxy KW - NIR spectroscopy KW - Modelling PY - 2019 DO - https://doi.org/10.1016/j.commatsci.2019.01.054 SN - 0927-0256 VL - 161 SP - 223 EP - 235 PB - Elsevier AN - OPUS4-47431 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Snow, T. A1 - Pauw, Brian Richard A1 - Smith, A. A1 - Terrill, N. A1 - Thuenemann, Andreas T1 - Modular SAXS data corrections N2 - A standardized methodology for the correction of scattering patterns, the calculation of uncertainties, the subtraction of backgrounds and solvents, optionally followed by the azimuthal averaging/reduction step, is presented. T2 - XVII International Small Angle Scattering Conference - SAS2018 CY - Traverse City, Michigan, USA DA - 07.10.2018 KW - Small-angle scattering KW - Software KW - Sata corrections KW - Quality PY - 2018 AN - OPUS4-46520 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Radtke, Martin T1 - ML@BAMLINE N2 - An overview of the machine learning methods used at BAMline. Examples of automatic alignment and optimisation based on Gaussian processes are discussed. Quantification of XRF measurements and reconstruction for coded aperture imaging based on neural networks are also presented. T2 - Machine Learning Workshop BAM CY - Online meeting DA - 18.03.2021 KW - Artificial Intelligence KW - Machine learning KW - Bayesian Optimization KW - Gaussian process KW - Neural Network PY - 2021 AN - OPUS4-54142 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eisentraut, Paul A1 - Dümichen, E. A1 - Goedecke-Röber, C. A1 - Wiesner, Yosri A1 - Jekel, M. A1 - Braun, U. 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 A1 - Dümichen, E. A1 - Goedecke, Caroline A1 - Braun, Ulrike T1 - Mikroplastik-Bestimmung mit TED-GC-MS N2 - Der Vortrag beschreibt den Entwicklungsprozess des Analysenverfahrens TED-GC-MS zur Bestimmung von Mikroplastikgehalten in Umweltproben im Rahmen des BMBF-Projektes MiWa. Die Funktionsweise, die Automatisierung und die Optimierung einzelner Geräteparameter und Leistungsdaten werden gezeigt. Untersuchungen des Einflusses von Probenmatrices werden dargestellt und die Ergebnisse einiger Messkampagnen und Ringversuche vorgestellt, die die Routinefähigkeit des Verfahrens dokumentieren. T2 - MiWa-Abschlusskonferenz CY - Karlsruhe, Germany DA - 10.09.2019 KW - Mikroplastik KW - Thermoanalyse KW - TED-GC-MS PY - 2019 AN - OPUS4-49115 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Mikroplastik – Ein Problem für die Menschheit? N2 - Mikroplastik findet sich in Ozeanen, Seen, Flüssen und Bächen. Es kann in unserem Boden, in der Luft und sogar in Organismen nachgewiesen werden. Jedes Jahr werden weltweit Millionen Tonnen freigesetzt. Doch wo und wie landet Mikroplastik in der Umwelt? Und wie können wir diese winzigen Partikel nachweisen? T2 - Berlin Science Week CY - Berlin, Germany DA - 01.11.2021 KW - Mikroplastik KW - TED-GC/MS PY - 2021 AN - OPUS4-53734 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Braun, Ulrike T1 - Mikroplastik in der Umwelt und im Trinkwasser: Einordnung der Relevanz und der Methodik N2 - Überblick zur Thematik Mikroplastik mit speziellem Fokus auf Trinkwasser T2 - 20. Jahrestagung Trinkwasserringversuche Nordrhein-Westfalen – Niedersachsen CY - Osnabrück, Germany DA - 06.03.2019 KW - Trinkwasser KW - Umwelt KW - Mikroplastik PY - 2019 AN - OPUS4-47578 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Mikroplastik Detektion mit Thermoanalytischen Methoden: Analytik, Referenzmaterial, Ringversuche N2 - Ich dem Vortrag geht es um die Vorstellung von thermoanalytischen Methoden für die Mikroplastik-Detektion. Verschiedene Kopplungsmöglichkeiten werden gezeigt und die Funktionsweise der TED-GC/MS wird erklärt. Im zweiten Teil werden Referenzmaterialien für die Mikroplastik-Analytik diskutiert. PET -Tabletten des PlasticTrace Projektes werden vorgestellt. Am Ende wird der VAMAS Ringversuch zur Mikroplastik-Detektion gezeigt. T2 - Plastik, Mikroplastik, Nanopartikel, PFAS und Verunreinigungen (Agilent Workshop) CY - Hamburg, Germany DA - 28.05.2024 KW - Mikroplastik KW - TED-GC/MS KW - Polymer 3R KW - Ringversuche KW - Referenzmaterial PY - 2024 AN - OPUS4-60155 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Braun, Ulrike T1 - Mikroplastik Analytik: Probennahme, Probenaufbereitung, Detektionsverfahren N2 - Das Diskussionspapier zur Mikroplastik Analytik wurde vorgestellt. Es entstand im Rahmen des Querschnitthemas 1 des BMBF Forschungsschwerpunktes Plastik in der Umwelt. T2 - Statuskonferenz der BMBF Fördermassnahme "Plastik in der Umwelt" CY - Berlin, Germany DA - 09.04.2019 KW - Harmonisierung KW - Mikroplastik KW - Probenahme KW - Detektion KW - Aufbereitung PY - 2019 AN - OPUS4-47797 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Eisentraut, Paul T1 - Mikroplastik an der BAM: TED-GC/MS und Referenzmaterialien N2 - Thema ist die Funktionsweise der TED-GC/MS als Methode für die Mikroplastik-Detektion sowie die Herstellung dazugehöriger Referenzmaterialien an der BAM T2 - 25. Kolloquium Massenspektrometrie von Polymeren CY - Online meeting DA - 17.06.2021 KW - Mikroplastik KW - TED-GC/MS KW - Referenzmaterial PY - 2021 AN - OPUS4-52835 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Braun, Ulrike T1 - Microplastics: Degradation properties of polymers in the environment N2 - The accumulation of plastics leaked into the environment achieve a high perception in the last years. It is uncontroversial that often an uncontrolled, high consumption of plastic products and a poor waste management resulted in plastic findings all over in the environment. However, less is known about the relevant pathways and fate of plastic in the environment. Especially plastic fragments smaller 5 mmm, so called microplastics, achieve a high attention, because their amount and risks arising from these fragments are still unknown. The basic mechanisms of plastic or more precise, of different polymer degradation processes are often not considered, resulting in unrealistic statements. For generation of fundamental understanding of this problem we developed in the last years a fast thermoanalytical method for identification and mass quantification of microplastics in complex samples. The presentation will also give a short introduction about polymer degradation. T2 - Environmental Geosciences Seminar CY - Vienna, Austria DA - 19.11.2018 KW - Microplastic KW - Analysis KW - Standardisation PY - 2018 AN - OPUS4-47182 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kittner, Maria A1 - Kerndorff, A. A1 - Ricking, M. A1 - Bednarz, M. A1 - Obermaier, N. A1 - Lukas, M. A1 - Asenova, M. A1 - Bordós, G. A1 - Eisentraut, Paul A1 - Hohenblum, P. A1 - Hudcova, H. A1 - Humer, F. A1 - István, T. G. A1 - Kirchner, M. A1 - Marushevska, O. A1 - Nemejcová, D. A1 - Oswald, P. A1 - Paunovic, M. A1 - Sengl, M. A1 - Slobodnik, J. A1 - Spanowsky, K. A1 - Tudorache, M. A1 - Wagensonner, H. A1 - Liska, I. A1 - Braun, U. A1 - Bannick, C. G. T1 - Microplastics in the Danube River Basin: A First Comprehensive Screening with a Harmonized Analytical Approach N2 - In this study, carried out within the Joint Danube Survey 4, a comprehensive microplastic screening in the water column within a large European river basin from its source to estuary, including major tributaries, was realized. The objective was to develop principles of a systematic and practicable microplastic monitoring strategy using sedimentation boxes for collection of suspended particulate matter followed by its subsequent analysis using thermal extraction desorption-gas chromatography/mass spectrometry. In total, 18 sampling sites in the Danube River Basin were investigated. The obtained suspended particulate matter samples were subdivided into the fractions of >100 μm and <100 μm and subsequently analyzed for microplastic mass contents. The results showed that microplastics were detected in all samples, with polyethylene being the predominant polymer with maximum contents of 22.24 μg/mg, 3.23 μg/mg for polystyrene, 1.03 μg/mg for styrene-butadiene-rubber, and 0.45 μg/mg for polypropylene. Further, polymers such as different sorts of polyester, polyacrylates, polylactide, and natural rubber were not detected or below the detection limit. Additional investigations on possible interference of polyethylene signals by algae-derived fatty acids were assessed. In the context of targeted monitoring, repeated measurements provide more certainty in the interpretation of the results for the individual sites. Nevertheless, it can be stated that the chosen approach using an integrative sampling and determination of total plastic content proved to be successful. KW - Thermal extraction desorption-gas chromatography/mass spectrometry (TED-GC/MS), monitoring KW - Microplastics KW - River KW - Suspended particulate matter (SPM) KW - Sedimentation box (SB) PY - 2022 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-551444 DO - https://doi.org/10.1021/acsestwater.1c00439 VL - 2 IS - 7 SP - 1174 EP - 1181 PB - ACS Publications AN - OPUS4-55144 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Microplastics at BAM: TED-GC/MS and reference materials N2 - Thsi talk aims to present the activities of microplastic analysis at BAM according to TED-GC/MS and reference materials developement. T2 - Webinar BAM / University of Birmingham CY - Online meeting DA - 15.06.2021 KW - Microplastic KW - TED-GC/MS KW - Reference materials PY - 2021 AN - OPUS4-53738 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Bauer, J. A1 - Miclea, P.-T. A1 - Braun, U. A1 - Altmann, Korinna A1 - Turek, M. A1 - Hagendorf, C. T1 - Microplastic detection and analysis in water samples N2 - Microplastic detection in water samples becomes important for tracing microplastic sources. Microplastic may harm desalination facilities by blocking filters and disturbing the marine food chain. Thermo analytical methods such as pyrolysis gas chromatography mass spectroscopy, and spectroscopic methods like (micro) Raman spectroscopy or (micro) Fouriertransform infrared spectroscopy in combination with appropriate filters and sample preparation are suitable for analyzing microplastics on a scale from 1 µm to 1000 µm fast and unambiguous. While the thermo analytical methods are suitable for larger sample volumes, Raman spectroscopy and Fouriertransform infrared spectroscopy are able to detect and analyze single microplastic particles for instance in bottled water. Machine learning algorithms ensure a reliable classification of different plastic materials. T2 - International Conference on Sustainable Energy-Water-Environment Nexus in Desert Climate 2019 CY - Ar-Rayyan, Qatar DA - 02.12.2019 KW - Microplastics KW - Water samples PY - 2022 SP - 111 EP - 113 PB - Springer AN - OPUS4-56240 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eisentraut, Paul A1 - Dümichen, E. A1 - Goedecke-Röber, C. A1 - Wiesner, Y. A1 - Jekel, M. A1 - Braun, U. 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 - Miclea, P.-T. A1 - Altmann, Korinna A1 - Wiesner, Yosri A1 - Hagendorf, C. T1 - Micro- and nanoplastic particle number and mass-based analysis on a plastic-free size-selective two stage Si membrane filtration cascade N2 - The poster presents a Si wafer filter development as two stage cascade and the adapter for microplastics filtration. T2 - SETAC Europe 2023 CY - Dublin, Ireland DA - 30.04.2023 KW - Microplastics KW - Filtration KW - TED-GC/MS KW - Polymer 3R KW - Cascade filtration PY - 2023 AN - OPUS4-57461 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Braun, Ulrike T1 - Messen ist nicht alles, aber ohne Messmethoden ist alles nichts!  N2 - Der Vortrag fasst den aktuellen Methodenstand bei der Analytik für Mikroplastik zusammen. T2 - FACHFORM „Mikroplastik“ anlässlich VUP-Jahrestagung 2019 CY - Gießen, Germany DA - 05.09.2019 KW - Mikroplastik KW - TED-GC-MS KW - Hamonisierung PY - 2019 AN - OPUS4-49066 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Wilke, Manuel A1 - Akhemtova, Irina A1 - Rademann, K. A1 - Emmerling, Franziska T1 - Mechanochemical synthesis of cerium(IV)-phosphonates N2 - The syntheses and crystal structures of two cerium(IV) phosphonates are presented. Cerium(IV) bis(phenylphosphonate) Ce(O3PC6H5)2 1 can be formed from precipitation and mechanochemical reaction, whereas cerium(IV) bis(carboxymethylphosphonate) monohydrate Ce(O3PCH2COOH)2 H2O 2 is only accessible via ball milling. All reactions proceed very fast and are completed within a short time span. In situ measurements for the syntheses of 1 show that the product occurs within seconds or a few minutes, respectively. The structures were solved from powder X-ray diffraction data. KW - In situ studies KW - Mechanochemistry KW - XRD PY - 2018 DO - https://doi.org/10.1007/s10853-018-2507-x SN - 0022-2461 SN - 1573-4803 VL - 53 IS - 19 SP - 13733 EP - 13741 PB - Springer Science + Business Media B.V. AN - OPUS4-45672 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -