TY - CONF A1 - Altmann, Korinna A1 - Müller, A. A1 - Kittner, Maria A1 - Braun, U. T1 - Plastik in Böden: Mikroplastik-Ergebnisse N2 - In diesem Vortrag geht um die Vorstellung der Ergebnisse des UBA Projektes Plastik in Böden. Es werden Mikroplastik-Gehalte in verschiedenen Böden präsentiert. T2 - Fachgespräch "Plastik in Böden" CY - Online meeting DA - 28.03.2022 KW - Mikroplastik KW - Mikroplastik Böden KW - Mikroplastik-Analytik PY - 2022 AN - OPUS4-54648 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Current projects in risk assessment and harmonisation N2 - The talk gives an overview about EU projects currently running for risk assessment and harmonisation in microplastic analysis. T2 - Micro- and Nanoplastics CY - Halle (Saale), Germany DA - 01.11.2023 KW - Microplastics KW - Harmonisation in microplastics KW - Polymer 3R PY - 2023 AN - OPUS4-58766 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Fengler, Petra A1 - Dailey, L. A. A1 - Kuchenbecker, Petra A1 - Lindemann, Franziska A1 - Wimmer, L. A1 - Mehn, D. A1 - Parker, L. A1 - Weimann, Christiane A1 - Potthoff, A. T1 - ILC on Laser diffraction - preliminary results N2 - This presentation addresses an interlaboratory comparison on size of polymeric particles (microplastics) measured by laser diffraction. Two microplastic particles were measured separately and once as mixture. Evaluation was done with Fraunhofer and Mie. Here, the first results are presented. T2 - CUSP Annual Meeting CY - Utrecht, Netherlands DA - 12.09.2023 KW - Microplastics KW - Laser diffraction KW - Polymer 3R KW - Size distribution KW - Polymer size PY - 2023 AN - OPUS4-58318 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Portela, R. A1 - Geburtig, Anja A1 - Barbero, F. A1 - Fenoglio, I. A1 - Visileanu, E. A1 - Wiesner, Y. A1 - Braun, U. A1 - Miclea, P.-T. T1 - What can thermoanalytical methods do for you ? N2 - This presentation summarizes outcomes of the CUSP projects POLYRISK and PlasticsFatE according to thermoanalytical methods.It highlights the importants of analytical methods to measure physical and chemical properties of the test materials. These informations are neccessary for interpretation of the toxicological test results. T2 - CUSP conference CY - Utrecht, Netherlands DA - 14.09.2023 KW - Microplastics KW - TED-GC/MS KW - CUSP KW - Polymer 3R KW - Thermoanalytical methods PY - 2023 AN - OPUS4-58312 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Stakeholder Workshop – Plastictrace WP1 N2 - The talk is about WP1 in the PlasticTrace project funded by Euromat. The projects harmonizes microplastic analysis by developing SOPs and reference materials. WP1 is responsible for material selection and preparation. All particles are homogeneity and stability checked according to ISO guide 35. T2 - Stakeholder workshop of PlasticTrace project CY - Online meeting DA - 14.12.2022 KW - Microplastic KW - Microplastics standardisation KW - Reference materials PY - 2022 AN - OPUS4-56772 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Eisentraut, Paul A1 - Goedecke, Caroline A1 - Braun, Ulrike T1 - Detektion von Kunststoffen mittels TED-GC-MS N2 - Vortrag zur Funktionsweise der TED-GC-MS für die Analyse von Mikroplastik in Umweltproben T2 - Arbeitsgespräch der Ressortforschungseinrichtungen CY - Berlin, Germany DA - 26.11.2018 KW - Mikroplastik KW - TED-GC-MS PY - 2018 AN - OPUS4-47184 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Repräsentative Untersuchungsstrategien für ein integratives Systemverständnis von spezifischen Einträgen von Kunststoffen in die Umwelt (RUSEKU) N2 - Der Vortrag wurde im Rahmen der Abschlusskonferenz des Forschungsschwerpunktes "Plastik in der Umwelt" des BMBF gehalten. Er fasst die Ergebnisse des Verbundprojektes RUSEKU zusammen. Es wurde die Herstellung verschiedener Testmaterialien für die Mikroplastik (MP) Analytik beschrieben. Im weiteren geht es um verschiedene Ansätze MP kostengünstig und schnell zu detektieren, z.B. mit Nahinfrarotspektroskopie. Nanoplastik konnte mit der Transmissionselektronenmikroskopie sichtbar gemacht werden. Für die praxisnahe Beprobung von Gewässern wurde die Fraktionierte Filtration entwickelt. Integrale Beprobungen können mit dem Sedimentationskasten erfolgen. Als Beispiele für die Beprobung realer Gewässer wurde das urbane Abwassersystem Kaiserslautern, Getränkewasser und Waschmaschinenwasser gezeigt. T2 - Abschlusskonferenz des Forschungsschwerpunktes "Plastik in der Umwelt" des BMBF CY - Online meeting DA - 20.04.2021 KW - Mikroplastik KW - TED-GC/MS KW - Probennahme KW - RUSEKU PY - 2021 AN - OPUS4-52546 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 - Altmann, Korinna T1 - Systemverständnis und Untersuchungsstrategien von Kunststoffeinträgen in die Umwelt – Ergebnisse des RUSEKU-Forschungsprojektes N2 - Ziel des Vortrages ist die Vermittlung der Herausforderungen der Mikroplastik-Analytik sowie der Harmonisierung der Analytik und des Ergebnistransfers in die Normung. T2 - Jahresabschluss-Sitzung GA "Mensch und Umwelt" CY - Online meeting DA - 24.11.2021 KW - Mikroplastik KW - Mikroplastik-Analytik PY - 2021 AN - OPUS4-53830 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna T1 - Mikroplastik Referenzmaterial und erste Vergleichsuntersuchungen N2 - Hierbei geht es um die Vorstellung von ersten Möglichkeiten um Referenzmaterial für die Mikroplastik-Analytik herzustellen und die Ergebnisse erster Vergleichsversuche. T2 - EUROLAB-D Workshop: Mikroplastik in der Praxis CY - Online meeting DA - 30.11.2021 KW - Mikroplastik KW - Referenzmaterial KW - Vergleichsversuche PY - 2021 AN - OPUS4-53880 LA - deu 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 - Altmann, Korinna A1 - Eisentraut, Paul A1 - Goedecke, Caroline A1 - Ricking, Mathias A1 - Bannick, Claus-Gerhard A1 - Braun, Ulrike T1 - Freshwater compartments: Screening method for polymer identification and mass contents of microplastic particles using TED-GC-MS N2 - The pathways of plastics, especially of microplastic (MP), in environmental compartments, particularly in aquatic systems, are not well understood. The critical point is the lack of fast, harmonised methods for sampling, sample preparation and sample analysis. These three analytical steps are dependent on one another and must be optimised. In recent years, we developed a method for representative sampling and fast detection of MP in aqueous systems. The sampling in different freshwater bodies is performed in the field with a fractionated filtration system using mesh sizes of 500, 100 and 50 µm. For water with an intermediate or high content of suspended particular matter a minimum of 1000 L has to be filtered. In the lab, mesh sizes of 10 and 5 µm are used for further filtration. Subsequently, the water filtrates of the different particle size classes are sterilised, dried, weighed and homogenised, if necessary. Conventional methods for MP analysis are infrared and raman spectroscopy, giving information on the shapes and numbers of individually identified MP particles. Our focus is on the determination of mass contents of various polymers potentially contained in environmental samples. For qualitative and quantitative MP detection TED-GC-MS is used, a two-step method based on gas chromatography-mass spectrometry (GC-MS) with previous thermal extraction. This method not only enables us to screen the samples for characteristic marker-molecules, thus identifying single polymers, but furthermore allows the calculation of mass contents of individual polymers. In the present work, different freshwater compartments were exemplarily studied to identify containing polymers and calculate their mass content in MP particles. T2 - MICRO2018 CY - Lanzarote, Spain DA - 19.11.2018 KW - Microplastic KW - TED-GC-MS KW - Mass contents PY - 2018 AN - OPUS4-46739 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Goedecke, Caroline A1 - Braun, Ulrike A1 - Bannick, C.-G. A1 - Steinmetz, H. A1 - Abusafia, A. A1 - Scheid, C. T1 - Identification and Quantification of Microplastic in Sewage systems by TED-GC-MS N2 - The number of publications reporting the amount of microplastic (MP) all over the world increased rapidly. Methods used so far are very time consuming and not able to provide information on total contents. As harmonised sampling, sample preparation and analysis strategies are missing different studies can hardly be compared and quantitative data, including identification and mass contents of the polymers found, are missing. This leads to a lack of comprehensive understanding of MP occurrence, source and entry pathways into the environment. We developed a method, Thermal Extraction/Desorption-Gaschromatography-Massspectrometry, as a fast screening method for MP analysis. Solid residues of water samples are heated up to 600 C under a N2 atmosphere without any sample preparation. The collected decomposition gases are separated in a gas chromatography system and detected in a mass spectrometer. Mass contents of the identified polymers can be calculated. In this presentation we will show first results from the influent of the wastewater treatment plant Kaiserslautern (Germany) and its combined sewage system as possibly entry pathway. In order to determine the relevance of wastewater split streams analysis of grey water will be conducted. Samples are fractionally filtered by a sieve cascade with mesh sizes of 500, 100, 50 µm. T2 - CEST2019 CY - Rhodos, Greece DA - 04.09.2019 KW - Microplastic KW - TED-GC-MS KW - Microplastic analysis KW - Grey water KW - Waste water treatment plant PY - 2019 AN - OPUS4-48933 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Braun, Ulrike T1 - Repräsentative Untersuchungsstrategien für ein integratives Systemverständnis von spezifischen Einträgen von Kunststoffen in die Umwelt N2 - Es wird über die Fortschritte des Verbundprojektes RUSEKU des BMBF-Forschungsschwerpunktes "Plastik in der Umwelt" berichtet. T2 - Statuskonferenz Plastik in der Umwelt CY - Berlin, Germany DA - 09.04.2019 KW - RUSEKU KW - Mikroplastik KW - Referenzmaterial KW - Neue Filtermaterialien PY - 2019 AN - OPUS4-47889 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Bannick, C. G. A1 - Kerndorff, A. A1 - Heller, C. A1 - Fuchs, M. A1 - Braun, U. T1 - Release of synthetic fibres during washing of typical household textiles: Findings from washing machine tests and resulting policy recommendations N2 - This talk summarizes the experimental setup and the results of one washing experiment under realistic conditions according to microplastic fiber release. T2 - Tackling microplastics in the environment CY - Brussels, Belgium DA - 09.03.2023 KW - Microplastics KW - Fibers of textile origin KW - Washing machine KW - Microplastic fibre release PY - 2023 AN - OPUS4-57204 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Portela, R A1 - Fernández-Lozano, J. F. A1 - Barbero, F. A1 - Bussy, C. A1 - Potthoff, A. A1 - Costa, A. A1 - Komlavi Afanou, A. J. T1 - Material Selection Strategy N2 - This poster is a summary of the material used in the PlasticsFatE project. It indicates the strategies for testing of various polymer properties next to each other according to risk and hazard assessment. T2 - CUSP annual meeting and conference CY - Utrecht, Netherlands DA - 12.09.2023 KW - Microplastics KW - CUSP KW - Material selection PY - 2023 AN - OPUS4-58311 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Bannick, C. G. A1 - Kerndorff, A. A1 - Heller, C. A1 - Fuchs, M. A1 - Braun, U. T1 - Welche Rolle spielen Textilien als Mikroplastik-Quelle im Abwasser? Was kann man dagegen tun? N2 - Diskutiert wird die Frage, ob Textilien gewaschen in der Waschmaschine ein Eintragspfad von Mikroplastik in die Umwelt sind. Nachgewiesen wird dies experimentell über Messungen zur Massenbestimmung mit der TED-GC/MS. T2 - DWA-Seminar: Mikroplastik in der (Siedlungs-)Wasserwirtschaft – Einordnung und Handlungsempfehlungen für die Praxis CY - Online meeting DA - 29.11.2023 KW - Mikroplastik KW - TED-GC/MS KW - Waschmaschine KW - Polymer 3R PY - 2023 AN - OPUS4-59279 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Scheid, C. A1 - Steinmetz, H. A1 - Bannick, C.-G. A1 - Abusafia, A. A1 - Dittmer, U. A1 - Braun, Ulrike T1 - Microplastic occurrence in urban sewage systems: Identification of sources for pathways into the environment N2 - All over the world, microplastic (MP) particles (particle size: 1 - 1.000 µm) are found in water, soil, air, biota and even food products. But plenty of these discussed findings are based on a very low number of real datasets, which are extrapolated to general projections. Furthermore, most data are not comparable because the strategies for sampling, sample preparation and detection methods are not harmonised/ or standardised. This would require extensive proficiancy tests. Because of the ubiquity presence and the unclear risks, which might arise from those particles, various political and environmental organisations (i.e. OECD, UNEP, WHO) identify the reduction of plastic entry in the environment as a key challenge for now and the future. This challenge includes the identification of relevant entry pathways but also the demand of harmonised, meaningful and reliable analytical procedures. Regarding this task within the last few years, a fast practical solution for MP analysis has been developed, which includes the steps of representative sampling, adequate sample preparation and fast detection. Sampling is done by fractional filtration over sieves with mesh sizes of 500, 100, 50 and 5 µm [1]. The received samples are measured by ThermoExtraction/Desorption-Gas Chromatography-Mass Spectrometry (TED-GC-MS) [1,2]. for the most abundant polymers used in practice, which are polyethylene (PE), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), polyamide (PA) and acrylate as well as styrene-butadiene-rubber (SBR), a main component of tires. The present presentation will give first-time insight in a comprehensive dataset of microplastic analysis for an exemplary urban sewage system. MP mass contents of different waters at several days, such as greywater, stormwater retention tank, influent and effluent of a wastewater treatment plant (WWTP) within an urban sewage system in Germany are determined. Furthermore, the mass of the polymers found in dry weather and rain weather flow are compared. The use of these large datasets allows first expressive conclusions regarding the contribution of urban sewage system to the MP entry sources in the environments. We found PP and PS in all different waters. Furthermore, there is SBR in influent and also in effluent of the WWTP. Surprisingly, we could also detect hugh amounts of PE in the effluent of the WWTP. T2 - SETAC Europe 2020 CY - Online meeting DA - 03.05.2020 KW - Microplastic analysis KW - TED-GC/MS KW - Microplastic particles KW - Microplastic mass contents PY - 2020 AN - OPUS4-50795 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Müller, A. A1 - Kittner, Maria A1 - Braun, U. T1 - Plastik in Böden: Mikroplastik-Analytik N2 - Im Vortrag wir eine Methode zur Analyse von Mikroplastik in Böden dargestellt. Es geht dabei um die Probenvorbereitung und Detektion. T2 - Fachgespräch "Plastik in Böden" CY - Online meeting DA - 28.03.2022 KW - Mikroplastik KW - TED-GC/MS KW - Mikroplastik-Analytik KW - Methodenentwicklung Böden PY - 2022 AN - OPUS4-54646 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Visileanu, E. A1 - Wiesner, Yosri A1 - Miclea, P.-T. T1 - Detektion von Mikroplastik N2 - In dem Vortrag geht es um die Möglichkeiten der Detektion von Mikroplastik im Allgemeinen. Es werden Beispiele für die Luft gezeigt. T2 - VDI-Workshop „Mikroplastik in der Außenluft – Was wir wissen und was wir (noch) nicht wissen CY - Online meeting DA - 15.11.2022 KW - Mikroplastik KW - Mikroplastik in Luft KW - Detektion von Mikroplastik PY - 2022 AN - OPUS4-56289 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Braun, Ulrike T1 - Herausforderungen bei der Mikroplastik-Analyse: Probennahme, Probenvorbereitung und Analyse N2 - Seit einigen Jahren wird in den Medien viel über das Thema Mikroplastik (MP) diskutiert. Dabei wird häufig von einer großen Anzahl an MP-Partikeln in allen Bereichen der Umwelt, wie dem Wasser, dem Boden, der Luft und in Biota sowie über mögliche Gefahren ausgehend von MP, berichtet. Jedoch sind diese Studien häufig nicht untereinander vergleichbar, da verschiedene Konzepte der Probennahme, der Aufbereitung und unterschiedliche Detektionsverfahren verwendet werden. Um diesen Mangel an vergleichbaren und aussagekräftigen Daten zu beheben, wird aktuell versucht, eine Harmonisierung der Mikroplastikanalytik voranzutreiben. Neue, schnellere Methoden zur MP Quantifizierung wurden entwickelt. Gleichzeitig werden neue Strategien zur Probenahme und Probenvorbereitung konzipiert, da hier die Fehlerquellen besonders große Auswirkungen auf das Ergebnis haben. In diesem Vortrag werden verschiedene Verfahren bezogen auf Probennahme, -vorbereitung und Analytik gezeigt und bezüglich ihres möglichen Ergebnisses diskutiert. T2 - 7. Workshop Technologieplattform Mikroverkapselung - Bioabbaubare Mikropartikel und Mikrokapseln CY - Bremen, Germany DA - 24.10.2019 KW - Mikroplastik KW - Analytik PY - 2019 AN - OPUS4-49395 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Braun, U. T1 - BAM activities on microplastics N2 - The presentation is about BAM's activities on the topic of microplastics. It describes what BAM has done in this field in recent years. On the one hand, TED-GC/MS is presented as an analytical method, on the other hand, currently available microplastic reference materials are presented. T2 - JRC/BAM Workshop on ILC CY - Online meeting DA - 11.02.2021 KW - Microplastic KW - TED-GC/MS KW - Microplastic particles KW - Reference materials PY - 2021 AN - OPUS4-52120 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Bannick, C. G. A1 - Kerndorff, A. A1 - Heller, C. A1 - Fuchs, M. A1 - Braun, U. T1 - Welche Rolle spielen Textilien als Mikroplastik-Quelle im Abwasser? N2 - In diesem Vortrag wird die Rolle der Waschmaschine als Eintragspfad von Mikroplastik in das Abwasser diskutiert und eine experimentelle Annäherung an das Problem beschrieben. T2 - Wasserwirtschaftliches Kolloquium der TU Berlin CY - Berlin, Germany DA - 14.12.2023 KW - Mikroplastik KW - TED-GC/MS KW - Waschmaschine PY - 2023 AN - OPUS4-59278 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Waniek, Tassilo T1 - Needs, concepts and state of the art: Top-down production of reference materials for micro- and nanoplastics and their use in harmonisation processes N2 - The talk explains the top-down production of materials suitable for mircoplastics and nanoplastics and the use in ILCs. T2 - EUROLAB webinar: MICROPLASTICS: regulations, standards and the role of laboratories CY - Online meeting DA - 15.02.2023 KW - Microplastics KW - Nanoplastics KW - ILC KW - Milling PY - 2023 AN - OPUS4-57008 LA - eng 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 - Altmann, Korinna T1 - Harmonisation efforts of the CUSP projects N2 - The talk is about harmonisation approaches within CUSP. First the five H2020 projects for research on risk assessment regarding microplastics topic were presented. Secondly, harmonisation process were discussed. T2 - VAMAS SC 47 Meeting CY - Turin, Italy DA - 19.10.2022 KW - Microplastics KW - Harmonisation KW - Nanoplastics KW - H2020 KW - Risk assessment PY - 2022 AN - OPUS4-56077 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Uzunlu, Büsra A1 - Ciornii, Dmitri A1 - Hodoroaba, Vasile-Dan A1 - Waniek, Tassilo T1 - Update – Milling and weathering of granules N2 - The talk aims to describe the production of microplastic particles as test material and the additional weathering for aged particles. T2 - PlasticsFate meeting CY - Online meeting DA - 12.11.2021 KW - Microplastic KW - Cryo milling KW - Aged particles PY - 2021 AN - OPUS4-53737 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Altmann, Korinna T1 - Reference material BAM-P206 polyethylene terephthalate (powder) N2 - This report contains detailed information on the preparation of the reference material as well as on homogeneity and stability investigations of the property of interest, the equivalent particle diameter, and on the analytical methods to determine the additional properties. The values for particle size distribution are based on the results from laser diffraction measurements of 3 different devices with at least 3 replicate measurements of 4 randomly chosen units of the reference material P206. KW - Microplastic KW - Reference material KW - PET PY - 2023 DO - https://doi.org/10.26272/opus4-59778 SP - 1 EP - 23 PB - Bundesanstalt für Materialforschung und -prüfung (BAM) CY - Berlin AN - OPUS4-59778 LA - eng 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 - Altmann, Korinna A1 - Sturm, Heinz T1 - Realitätsnahe Referenzmaterialien für die Mikroplastik-Analytik und Vergleichsuntersuchungen N2 - Zur Validierung und Harmonisierung von verschiedenen Methoden in der Mikroplastik-Analytik werden polymere Referenzmaterialien benötigt. In diesem Vortrag wird dargestellt, was bisher an der BAM zu Referenzmaterialien für die Mikroplastik-Analytik entwickelt wurde, wo es hingehen soll und ein Überblick über bisher gelaufene Vergleichsuntersuchungen gebracht. T2 - Kick-off Meeting "Mikroplastik in Lebensmitteln" CY - Online meeting DA - 03.12.2020 KW - Mikroplastik KW - Referenzmaterial KW - Vergleichsuntersuchungen KW - Ringversuche PY - 2020 AN - OPUS4-51743 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Altmann, Korinna A1 - Sturm, Heinz A1 - Fischer, D. A1 - Fischer, F. A1 - Ivleva, N. A1 - Witzig, C. A1 - Zumbülte, N. A1 - Braun, U. T1 - Results of the Plastic in the environment comparative test N2 - The talk describes the sturcture and the results of the "plastics in the environment" comparative test of 2019. T2 - Symposium "Challenges of microplastic analysis – Bridging state of the art and policy needs” CY - Online meeting DA - 09.09.2021 KW - Microplastic KW - Comparative test KW - ILC PY - 2021 AN - OPUS4-53236 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Almalla, A. A1 - Özcan Sandikcioglu, Özlem A1 - Witt, Julia T1 - In Situ Atomic Force Microscopy Analysis of the Corrosion Processes at the Buried Interface of an Epoxy-like Model Organic Film and AA2024-T3 Aluminum Alloy N2 - The application of characterization methods with high spatial resolution to the analysis of buried coating/metal interfaces requires the design and use of model systems. Herein, an epoxy-like thin film is used as a model coating resembling the epoxy-based coatings and adhesives widely used in technical applications. Spin coating is used for the deposition of a 30 nm-thin bilayer (BL) composed of poly-(ethylenimine) (PEI) and poly[(o-cresyl glycidyl ether)-co-formaldehyde] (CNER). Fourier-transform infrared spectroscopy (FTIR) results confirm that the exposure of coated AA2024-T3 (AA) samples to the corrosive electrolyte solution does not cause the degradation of the polymer layer. In situ atomic force microscopy (AFM) studies are performed to monitor local corrosion processes at the buried interface of the epoxy-like film and the AA2024-T3 aluminum alloy surface in an aqueous electrolyte solution. Hydrogen evolution due to the reduction of water as the cathodic corrosion reaction leads to local blister formation. Based on the results of the complementary energy-dispersive X-ray spectroscopy (EDX) analysis performed at the same region of interest, most of the hydrogen evolved originates at the vicinity of Mg-containing intermetallic particles. KW - Scanning Kelvin probe force microscopy KW - Aluminum alloys KW - Buried interfaces KW - In situ atomic force microscopy KW - Local corrosion PY - 2022 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-546932 DO - https://doi.org/10.1002/adem.202101342 SN - 1438-1656 SP - 1 EP - 9 PB - Wiley VHC-Verlag AN - OPUS4-54693 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Almalla, A. A1 - Hertwig, Andreas A1 - Fischer, Daniel A1 - Özcan Sandikcioglu, Özlem A1 - Witt, Julia T1 - Development of layer-by-layer assembled thin coatings on aluminium alloy AA2024-T3 for high resolution studies of local corrosion processes N2 - The aim of this study is to develop nanometer-thin epoxy-based films on aluminium alloy AA2024-T3 as a model coating system for high resolution corrosion studies. Spin coating was used for the layer-by-layer (LbL) deposition of poly-(ethylenimine) (PEI) and poly([o-cresyl glycidyl ether]-co-formaldehyde) (CNER) bilayers. The film chemistry and the cross-linking process were characterized by means of Fourier-transform infrared spectroscopy (FTIR). Ellipsometric data confirmed the linear increase of film thickness. The potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) results indicate the improvement of the film barrier properties with increasing film thickness. Mapping of the topography and the volta potential was performed by means of scanning Kelvin probe force microscopy (SKPFM). The results indicate the presence of a homogeneous film structure, while the intermetallic phases can still be identified below the coating. The SKPFM Analysis confirmed that the model films are suitable for investigation of corrosion processes at the coating/metal interface. KW - Spectroscopy KW - Coatings KW - Electrochemistry KW - Microscopy KW - Resins PY - 2020 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-514627 DO - https://doi.org/10.1002/app.49826 SN - 0021-8995 VL - 137 IS - 48 SP - e49826-1 EP - e49826-9 PB - Wiley CY - New York, NY AN - OPUS4-51462 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Aliyah, K. A1 - Prehal, C. A1 - Diercks, J. S. A1 - Diklić, N. A1 - Xu, L. A1 - Ünsal, S. A1 - Appel, C. A1 - Pauw, Brian Richard A1 - Smales, Glen Jacob A1 - Guizar-Sicairos, M. A1 - Herranz, J. A1 - Gubler, L. A1 - Büchi, F. N. A1 - Eller, J. T1 - Quantification of PEFC Catalyst Layer Saturation via In Silico, Ex Situ, and In Situ Small-Angle X-ray Scattering N2 - The complex nature of liquid water saturation of polymer electrolyte fuel cell (PEFC) catalyst layers (CLs) greatly affects the device performance. To investigate this problem, we present a method to quantify the presence of liquid water in a PEFC CL using small-angle X-ray scattering (SAXS). This method leverages the differences in electron densities between the solid catalyst matrix and the liquid water filled pores of the CL under both dry and wet conditions. This approach is validated using ex situ wetting experiments, which aid the study of the transient saturation of a CL in a flow cell configuration in situ. The azimuthally integrated scattering data are fitted using 3D morphology models of the CL under dry conditions. Different wetting scenarios are realized in silico, and the corresponding SAXS data are numerically simulated by a direct 3D Fourier transformation. The simulated SAXS profiles of the different wetting scenarios are used to interpret the measured SAXS data which allows the derivation of the most probable wetting mechanism within a flow cell electrode. KW - Polymer electrolyte fuel cell KW - Water management KW - Catalyst layer KW - Representative morphology modeling KW - Small-angle X-ray scattering KW - MOUSE KW - SAXS PY - 2023 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-575973 DO - https://doi.org/10.1021/acsami.3c00420 SN - 1944-8244 VL - 15 IS - 22 SP - 26538 EP - 26553 PB - ACS Publications AN - OPUS4-57597 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ali, Naveed Zafar A1 - Campbell, B. J. A1 - Jansen, M. T1 - Topotactic, pressure-driven, diffusion-less phasetransition of layered CsCoO2to a stuffedcristobalite-type configuration N2 - CsCoO2, featuring a two-dimensional layered architecture of edge- and vertex-linked CoO4tetrahedra, is subjected to a temperature-driven reversible second-order phase transformation at 100 K, which corresponds to a structuralrelaxation with concurrent tilting and breathing modes of edge-sharing CoO4tetrahedra. In the present investigation, it was found that pressure induces a phase transition, which encompasses a dramatic change in the connectivity ofthe tetrahedra. At 923 K and 2 GPa, beta-CsCoO2 undergoes a first-order phasetransition to a new quenchable high-pressure polymorph,alpha-CsCoO2. It is built up of a three-dimensional cristobalite-type network of vertex-sharing CoO4 tetrahedra. According to a Rietveld refinement of high-resolution powderdiffraction data, the new high-pressure polymorph gamma-CsCoO2 crystallizes in the tetragonal space groupI41/amd:2 (Z= 4) with the lattice constants a= 5.8711 (1) and c= 8.3214 (2) A, corresponding to a shrinkage in volume by 5.7% compared with the ambient-temperature and atmospheric pressure-CsCoO2polymorph.The pressure-induced transition (beta>gamma) is reversible;-CsCoO2 stays metastable under ambient conditions, but transforms back to the-CsCoO2structure upon heating to 573 K. The transformation pathway revealed isremarkable in that it is topotactic, as is demonstrated through a clean displacive transformation track between the two phases that employs the symmetry oftheir common subgroupPb21a(alternative setting of space group No. 29 that matches the conventional-phase cell). KW - Structures under extreme conditions KW - Topotactic phase transitions KW - Transformation pathways KW - Oxocobaltates KW - Cristobalite frameworks PY - 2019 DO - https://doi.org/10.1107/S2052520619008436 SN - 2052-5206 VL - 75 IS - 4 SP - 704 EP - 710 PB - International Union of Crystallography AN - OPUS4-48782 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ali, Naveed A1 - Komal, N. A1 - Malik, Z. A1 - Chaudhary, A.J. T1 - Synthesis, characterization and properties of hierarchically assembled antimony oxyhalides nanonetworks N2 - The novel synthesis route has been developed for hierarchically structured; nanorods and nanosheets of Sb4O5Cl2 from a single precursor, with dimension range between 57–90 nm. X-ray powder diffraction analysis confirmed the monoclinic crystal symmetry in P21/c(14)with structure type Sb4O5Cl2 for both forms; the nanorods and nanosheets. Rietveld refinements and crystallite size investigations of the powder patterns revealed significant enhancement in intensity with subtle variation in the lattice parameters and crystallite size decrease in case of nanosheets in comparison to the nanorods assembly. Through scanning electron microscopy, a composition commensurate to Sb4O5Cl2 at% with averaged dimensions; dia.∼90 nm, l ∼ 2 μm for nanorods and dia.∼50–150 nm for nanosheets got corroborated. Owing to the quantum confinement a band gap widening was observed while moving from bulk to nano regime, i.e. 3.25, 3.31 and 3.34 eV, for bulk, nanosheets, and nanorods, respectively. In the case of nanosheets, the highest value of dielectric constant was observed, i.e. 87, as compared to nanorods and the bulk, i.e. 40 and 35.5, respectively. The nanosheets also showed the highest value of dielectric and tangent loss with an increase in frequency due to the least crystallite size of these nanonetworks. Nanosheets depicted the higher AC conductivity at low frequency due to the alignment of the charges but its value decreases at the higher frequency due to lack of time for charge reorientation. The hopping phenomenon was observed in all three cases with the most prominent one in bulk case at higher frequencies. KW - Nanorods KW - Nanosheets KW - Antimony oxychloride ( Sb4O5Cl2) KW - Optical properties KW - Dielectric properties PY - 2019 DO - https://doi.org/10.1088/2053-1591/ab0da9 SN - 2053-1591 VL - 6 IS - 6 SP - 065035 PB - IOP AN - OPUS4-47734 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Al-Terkawi, Abdal-Azim A1 - Scholz, Gudrun A1 - Emmerling, Franziska A1 - Kemnitz, Erhard T1 - Ca-Tetrafluorophthalate and Sr-isophthalate: mechanochemical synthesis and characterization in comparison with other Ca-and Sr-coordination polymers N2 - New Ca- and Sr-based coordination polymers (CPs) were mechanochemically synthesized by milling metal hydroxide samples (M = Ca, Sr) with tetrafluorophthalic acid (H2oBDC-F4) and isophthalic acid (H2mBDC). [Ca(oBDC-F4)(H2O)2] (1) exhibits a small surface area which is slightly increased after removing the crystal water. On the other hand, the hydrated sample of the nonfluorinated [Sr(mBDC)(H2O)3.4] (2) reveals a small BET surface area which remains unchanged even after the release of crystal water via thermal treatment. The new compounds 1 and 2 are similar to their Sr- and Ca-analogs, respectively. These findings are confirmed by thermal analysis, MAS NMR, and ATR-IR measurements, in addition to the Le Bail refinements for the measured powder X-ray data of 1 and 2. Ca- and Sr-CPs based on perfluorinated dicarboxylic systems and their nonfluorinated analogs diverse in structural and chemical properties depending on the geometries of the organic linkers and the presence of fluorine atoms. The fluorinations of organic ligands lead to the formation of fluorinated CPs with higher dimensionalities compared to their nonfluorinated counterparts. Conversely, the thermal stabilities of the latter are higher than those of the fluorinated CPs. KW - Mechanochemistry PY - 2018 DO - https://doi.org/10.1039/c8dt00695d SN - 1477-9226 SN - 1477-9234 VL - 47 IS - 16 SP - 5743 EP - 5754 PB - Royal Society of Chemistry CY - Cambridge AN - OPUS4-44696 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Al-Terkawi, Abdal-Azim A1 - Scholz, Gudrun A1 - Emmerling, Franziska A1 - Kemnitz, Erhard T1 - Barium coordination polymers based on fluorinated and fluorine-free benzene-dicarboxylates: Mechanochemical synthesis and spectroscopic characterization N2 - A series of new Ba-based coordination polymers (CPs) were mechanochemically synthesized by milling Ba-hydroxide samples with perfluorinated and fluorine-free benzene-dicarboxylic acids, including tetrafluoroisophthalic acid (H2mBDC-F4), tetrafluorophthalic acid (H2oBDC-F4), isophthalic acid (H2mBDC) and phthalic acid (H2oBDC). The new fluorinated CPs: [Ba(mBDC-F4)$0.5H2O] (1) and [Ba(oBDC-F4)·1.5H2O] (2) are compared to their nonfluorinated counterparts: [Ba(mBDC)·2.5H2O] (3), and [Ba(oBDC)·1H2O] (4). These materials are thoroughly characterized using powder X-ray diffraction. The products obtained by milling are all hydrated but vary in their water contents. Compositions and local structures are investigated by elemental analysis, thermal analysis, MAS NMR and attenuated total reflectioninfrared spectroscopy. These materials exhibit high thermal stabilities but small surface areas that remain unchanged even after thermal treatments. KW - Mechanochemical synthesis KW - Barium KW - Fluorine KW - Coordination polymers KW - PXRD KW - MAS NMR spectroscopy PY - 2018 UR - https://www.sciencedirect.com/science/article/pii/S1293255817310798 DO - https://doi.org/10.1016/j.solidstatesciences.2018.03.013 SN - 1293-2558 SN - 1873-3085 VL - 79 SP - 99 EP - 108 PB - Elsevier AN - OPUS4-44880 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Al-Terkawi, Abdal-Azim A1 - Scholz, G. A1 - Prinz, Carsten A1 - Zimathies, Annett A1 - Emmerling, Franziska A1 - Kemnitz, E. T1 - Hydrated and dehydrated Ca-coordination polymers based on benzene-dicarboxylates: mechanochemical synthesis, structure refinement, and spectroscopic characterization N2 - A series of Ca-based coordination polymers were prepared mechanochemically by milling Ca(OH)2 with phthalic acid (H2oBDC), isophthalic acid (H2mBDC), and terephthalic acid (H2pBDC). The hydrated compounds [Ca(oBDC)(H2O)], [Ca(mBDC)(H2O)3.4], and [Ca(pBDC)(H2O)3] were prepared for the first time via mechanochemical routes. The refined structures were validated by extended X-ray absorption data. The new dehydrated compound [Ca(oBDC)] (1-H2O), obtained after the thermal post-treatment of 1 in a reversible phase transition process, was determined ab initio based on the powder X-ray diffraction (PXRD) data. The materials were thoroughly characterized using elemental analysis, thermal analysis, and spectroscopic methods: magic-angle spinning NMR and attenuated total reflection-infrared spectroscopy. The specific surface areas and sorption properties of the hydrated and dehydrated samples were determined using the isotherms of gas sorption and dynamic vapor sorption measurements. KW - Mechanochemistry KW - XRD PY - 2018 UR - http://pubs.rsc.org/en/content/articlehtml/2017/ce/c7ce01906h DO - https://doi.org/10.1039/C7CE01906H VL - 20 SP - 946 EP - 961 PB - Royal Society of Chemistry AN - OPUS4-44440 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Al-Terkawi, Abdal-Azim A1 - Prinz, Carsten A1 - Scholz, Gudrun A1 - Kemnitz, Erhard A1 - Emmerling, Franziska T1 - Ca-, Sr-, and Ba-Coordination polymers based on anthranilic acid via mechanochemistry N2 - Ca-, Sr-, and Ba-Based coordination polymers (CPs) were prepared mechanochemically by milling metal-hydroxide samples with anthranilic acid (oABAH). {[Ca(oABA)2(H2O)3]}n consists of one-dimensional polymeric chains that are further connected by a hydrogen-bonding network. {[Sr(oABA)2(H2O)2]·H2O}n is a one-dimensional CP in which water molecules bridge Sr2+ ions and increase the dimensionality by building an extended network. {[Ba(oABA)2(H2O)]}n crystallizes as a two-dimensional CP comprising one bridging water molecule. The cation radii influence the inorganic connectivity and dimensionality of the resulting crystal structures. The crystal structures were refined from powder X-ray diffraction data using the Rietveld method. The local coordination environments were studied via extended X-ray absorption fine structure (EXAFS) measurements. The compounds were further characterized using comprehensive analytical methods such as elemental analysis, thermal analysis, MAS NMR, imaging, and dynamic vapor sorption (DVS) measurements. Compounds 1, 2, and 3 exhibit small surface areas which decrease further after thermal annealing experiments. All compounds exhibit a phase transformation upon heating, which is only reversible in 3. KW - Mechanochemistry KW - XRD PY - 2019 DO - https://doi.org/10.1039/c9dt00991d SN - 1477-9226 SN - 1477-9234 VL - 48 IS - 19 SP - 6513 EP - 6521 PB - Royal Society of Chemistry AN - OPUS4-48014 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Akhmetova, Irina A1 - Schuzjajew, K. A1 - Wilke, M. A1 - de Oliveira Guilherme Buzanich, Ana A1 - Rademann, K. A1 - Roth, C. A1 - Emmerling, Franziska T1 - Synthesis, characterization and in situ monitoring of the mechanochemical reaction process of two manganese(II)-phosphonates with N-containing ligands N2 - Two divalent manganese aminophosphonates, manganese mono (nitrilotrimethylphosphonate) (MnNP3) and manganese bis N-(carboxymethyl)iminodi(methylphosphonate)) (Mn(NP2AH)2), have been prepared by mechanochemical synthesis and characterized by powder X-ray diffraction (PXRD). The structure of the novel compound Mn(NP2AH)2 was determined from PXRD data. MnNP3 as well as Mn(NP2AH)2 exhibits a chain-like structure. In both cases, the manganese atom is coordinated by six oxygen atoms in a distorted octahedron. The local coordination around Mn was further characterized by extended X-ray absorption fine structure. The synthesis process was followed in situ by synchrotron X-ray diffraction revealing a three-step reaction mechanism. The asprepared manganese(II) phosphonates were calcined on air. All samples were successfully tested for their suitability as catalyst material in the oxygen evolution reaction. KW - Mechanochemistry KW - In situ KW - XRD PY - 2018 DO - https://doi.org/10.1007/s10853-018-2608-6 SN - 0022-2461 SN - 1573-4803 VL - 53 IS - 19 SP - 13390 EP - 13399 PB - Springer Science + Business Media B.V. AN - OPUS4-45673 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Akhmetova, Irina A1 - Beyer, Sebastian A1 - Schutjajew, K. A1 - Tichter, T. A1 - Wilke, Manuel A1 - Prinz, Carsten A1 - B. Martins, Inês C. A1 - Al-Sabbagh, Dominik A1 - Roth, C. A1 - Emmerling, Franziska T1 - Cadmium benzylphosphonates - the close relationship between structure and properties N2 - Cadmium benzylphosphonate Cd(O3PBn)·H2O and its fluorinated derivates Cd(O3PBn-3F)·H2O, Cd(O3PBn-4F)·H2O, and Cd(O3PBn-F5)·H2O were synthesized mechanochemically. The Crystal structures of the compounds were determined based on powder X-ray diffraction (PXRD) data. The influence of the ligand substitution on the crystal structure of the metal phosphonate was determined. The hydrophobicity as a function of degree of fluorination was investigated using dynamic vapor sorption. KW - Mechanochemistry KW - Metal phosphonates KW - PXRD KW - DVS PY - 2019 DO - https://doi.org/10.1039/c9ce00776h VL - 21 SP - 5958 EP - 5964 PB - RSC Royal Society of Chemistry AN - OPUS4-49930 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Akhmetova, Irina A1 - Roth, C. A1 - Emmerling, Franziska T1 - Structure-properties relationships in cadmium benzylphosphonates N2 - The exploration of metal phosphonates has gained great interest during the last decades, because of their structural diversity. They are promising candidates for a variety of applications ranging from adsorbance to electrocatalysis. The knowledge of the Crystal structure is significant for assigning a coordination polymer for a specific function. We investigated the influence of the fluorination degree of the organic linker on the Crystal packing, the interlayer distance, and the hydrophobicity of the resulting compounds. With fluorinated and nonfluorinated benzylphosphonic acids as starting materials in mechanochemical synthesis, four novel cadmium benzylphosphonates were obtained. Their structures were solved from powder X-ray diffraction. T2 - 2nd European Workshop on Metal Phosphonates CY - Berlin, Germany DA - 24.09.2019 KW - Mechanochemistry KW - Metal phosphonates KW - PXRD KW - DVS PY - 2019 AN - OPUS4-49933 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Akhmetova, Irina A1 - Schutjajew, Konstantin A1 - Roth, Christina A1 - Emmerling, Franziska T1 - Mechanochemical synthesis of metal phosphonates N2 - The exploration of metal phosphonates chemistry has gained great interest during the last decades, because of their structural diversity. Transition metal phosphonates are promising candidates for an application as electrocatalysts in oxygen evolution reactions (OER). Here, we present the in situ investigation of mechanochemical syntheses of different manganese phosphonates by synchrotron X-ray diffraction. Nitrilotri(methylenephosphonic acid) and N,N-Bis(phosphonomethyl)glycine were chosen as ligands. The liquid-assisted milling process can be divided into three steps, including an amorphous stage. One of the products has not been obtained by classical solution chemistry before. These metal phosphonates and/or their derivatives are considered to be active in electrochemical energy conversion. The verification of their applicability is one of the topics of our resent research. T2 - Fundamental Bases of Mechanochemical Technologies CY - Novosibirsk, Russia DA - 25.06.2018 KW - Metal phosphonates KW - Mechanochemistry KW - PXRD KW - Thermography PY - 2018 AN - OPUS4-46996 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Akhmetova, Irina A1 - Emmerling, Franziska A1 - Schutjajew, Konstantin A1 - Roth, Christina T1 - In situ investigation of milling reactions and structure determination of the products using X-ray diffraction N2 - Mechanochemistry is a versatile approach for green and fast synthesis of pure substances. By milling the reactants, various organic, inorganic, and metal-organic compounds can be obtained in high yields. Although mechanochemistry is widely used, the underlying mechanisms are not fully understood making mechanochemical reactions difficult to predict. Metal phosphonates are metal-organic compounds accessible by grinding. Because of their structural diversity, the exploration of the chemistry of metal phosphonates has gained considerable interest during the last decades. Transition metal phosphonates are promising candidates for an application as electrocatalysts in oxygen evolution reaction (OER). Here, we present the in situ investigation of the mechanochemical synthesis of a manganese(II)-phosphonate by synchrotron X-ray diffraction and thermography. The product has not been obtained by classical solution chemistry before and its crystal structure was determined from PXRD data. The milling process can be divided into different steps, with the product crystallization corresponding with the highest temperature rise. The activity of this metal phosphonate towards OER was measured and is presented here. T2 - International School of Crystallography - 52nd Course: Quantum Crystallography CY - Erice, Italy DA - 1.06.2018 KW - Metal phosphonates KW - Mechanochemistry KW - PXRD KW - OER KW - Thermography PY - 2018 AN - OPUS4-46998 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Akhmetova, Irina A1 - Haferkamp, Sebastian A1 - Schutjajew, Konstantin A1 - Roth, Christina A1 - Emmerling, Franziska T1 - In situ investigation of mechanochemical syntheses of manganese phosphonates with N-containing ligands N2 - Mechanochemistry is a versatile approach for green and fast synthesis of pure substances. The exploration of the chemistry of metal phosphonates has gained considerable interest during the last decades due to their structural diversity. We synthesized manganese phosphonates in milling reactions. The mechanochemical reactions were investigated in situ to reveal the underlying mechanisms. T2 - Joint BER II and BESSY II User Meeting CY - Berlin, Germany DA - 05.12.2018 KW - Metal phosphonates KW - Mechanochemistry KW - PXRD KW - In situ KW - Thermography PY - 2018 AN - OPUS4-46999 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Akhmetova, Irina A1 - Haferkamp, Sebastian A1 - Emmerling, Franziska T1 - New transition metal phosphonates obtained by mechanochemistry N2 - Metal phosphonates are metal-organic compounds consisting of a metal core and a phosphonate ligand. Depending on the nature of the ligand, metal phosphonates appear in different structures covering the range from molecular compounds to three-dimensional networks. Due to their structural diversity, the chemistry of metal phosphonates has gained great interest during the last decades. Metal phosphonates can be used for various applications as gas storage and separation, magnetism, and energy conversion. Especially transition metal phosphonates are promising candidates as electrocatalysts. Mechanochemistry is a versatile approach for green and fast synthesis of pure substances. By milling the reactants, various organic, inorganic, and metal-organic compounds can be obtained in high yields. Here, we present the synthesis of different new metal phosphonates obtained by grinding of metal acetates with respective phosphonic acids. By varying the ratio of the reactants, we are able to determine the composition of the final products. The addition of small amounts of liquid to the grinding process tends to increase the product’s crystallinity. The crystal structures of the new compounds were determined from powder X-ray data. T2 - 27th Annual Meeting of the German Crystallographic Society CY - Leipzig, Germany DA - 25.03.2019 KW - Metal phosphonates KW - Mechanochemistry KW - PXRD KW - Structure solution PY - 2019 AN - OPUS4-47837 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Akbar, S. A1 - Hasanain, S.K. A1 - Ivashenko, O. A1 - Dutka, M.V. A1 - Akhtar, N. A1 - De Hosson, J.Th.M. A1 - Ali, Naveed A1 - Rudolf, P. T1 - Defect ferromagnetism in SnO2:Zn2+ hierarchical nanostructures: correlation between structural, electronic and magnetic properties N2 - We report on the ferromagnetism of Sn1-xZnxO2 (x < 0.1) hierarchical nanostructures with various morphologies synthesized by a solvothermal route. A room temperature ferromagnetic and paramagnetic response was observed for all compositions, with a maximum in ferromagnetism for x = 0.04. The ferromagnetic behaviour was found to correlate with the presence of zinc on substitutional Sn sites and with a low oxygen vacancy concentration in the samples. The morphology of the nanostructures varied with zinc concentration. The strongest ferromagnetic response was observed in nanostructures with well-formed shapes, having nanoneedles on their surfaces. These nanoneedles consist of (110) and (101) planes, which are understood to be important in stabilizing the ferromagnetic defects. At higher zinc concentration the nanostructures become eroded and agglomerated, a phenomenon accompanied with a strong decrease in their ferromagnetic response. The observed trends are explained in the light of recent computational studies that discuss the relative stability of ferromagnetic defects on various surfaces and the role of oxygen vacancies in degrading ferromagnetism via an increase in free electron concentration. KW - Ferromagnetism KW - Nanostructures KW - Magnetic properties PY - 2019 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-473014 DO - https://doi.org/10.1039/c9ra00455f SN - 2046-2069 VL - 9 IS - 7 SP - 4082 EP - 4091 PB - Royal Society of Chemistry AN - OPUS4-47301 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Ahmed, R. A1 - Vaishampayan, A. A1 - Cuellar-Camacho, J. L. A1 - Wight, D. J. A1 - Donskyi, Ievgen A1 - Unger, Wolfgang A1 - Grohmann, E. A1 - Haag, R. A1 - Wagner, O. T1 - Multivalent Bacteria Binding by Flexible Polycationic Microsheets Matching Their Surface Charge Density N2 - Aiming at the overall negative surface charge of bacteria, a new strategy of antibacterial agents based on large polymer-modified graphene oxide (GO) sheets is assessed. The presented flexible, polycationic Sheets match the size and charge density of the Escherichia coli surface charge density (2 × 1014 cm−2). These matching parameters create an unspecific but very strong bacteria adsorber by multivalent, electrostatic attraction. Their interaction with bacteria is visualized via atomic force and confocal microscopy and shows that they effectively bind and wrap around E. coli cells, and thereby immobilize them. The incubation of Gram-negative and -positive bacteria (E. coli and methicillin-resistant Staphylococcus aureus, MRSA) with these polycationic sheets leads to the inhibition of proliferation and a reduction of the colony forming bacteria over time. This new type of antibacterial agent acts in a different mode of Action than classical biocides and could potentially be employed in medicinal, technical, or agriculture applications. The presented microsheets and their unspecific binding of cell interfaces could further be employed as adsorber material for bacterial filtration or immobilization for imaging, analysis, or sensor technologies. KW - Surface charge KW - Bacteria KW - Graphene oxide KW - Escherichia coli KW - XPS PY - 2020 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-509651 DO - https://doi.org/10.1002/admi.201902066 VL - 7 IS - 15 SP - 1902066 PB - WILEY-VCH Verlag GmbH & Co. KGaA CY - Weinheim AN - OPUS4-50965 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Agostini, G. A1 - Radnik, Jörg T1 - Spectroscopy in Catalysis N2 - Knowledge-based catalyst development is always an interaction between preparation, analysis and catalytic testing. Only if these three factors fit together can success be expected. For the analytic side of this triangle, spectroscopic methods play a crucial role. Whereas with diffraction, scattering and microscopy, decisive insights into the structure and morphology of the catalysts can be obtained, spectroscopy produces new knowledge about the chemical nature of the catalyst, e.g., its bonding and valence states. KW - Spectroscopy KW - Catalysis KW - Operando KW - In situ PY - 2020 UR - https://nbn-resolving.org/urn:nbn:de:kobv:b43-506507 DO - https://doi.org/10.3390/catal10040408 VL - 10 IS - 4 SP - 408 PB - MDPI CY - Basel AN - OPUS4-50650 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -