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DTSTART;TZID=Europe/Paris:20230901T140000
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DTSTAMP:20260424T222335
CREATED:20230314T191657Z
LAST-MODIFIED:20230824T085011Z
UID:10000019-1693576800-1693580400@remade-project.eu
SUMMARY:Non-destructive material analysis using positron annihilation spectroscopy (PALS) - an overview
DESCRIPTION:Zoom webinar | Live stream on Youtube\nEric HIRSCHMANN\nInstitute of Radiation Physics\nHelmholtz-Zentrum Dresden – Rossendorf (HZDR) \nThe positron research infrastructure (pELBE) at the ELBE linear accelerator at the HZDR is a collection of methods and instruments that characterize defects\, determine open volumes and investigate open or closed microporous systems using positron annihilation spectroscopy. It is used for studying a variety of phenomena and material properties on an atomic scale. \nFor example\, performance parameters in solar cells by characterization of the defect concentration\, optimization of process parameters for thin polymer membranes regarding free volume effects or determination of pore size distribution in nano filters for high-performance applications.\nBeing the anti-particle of electrons\, positrons are used to probe material defects at low concentrations and with high sensitivity. With the advantage of being a non-destructive materials research method\, positron annihilation has been developed as a well-established tool for investigations of metals\, semiconductors\, polymers and porous materials. \n  \n 
URL:https://remade-project.eu/index.php/event/webinar6/
LOCATION:Zoom (permanent link)
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://remade-project.eu/wp-content/uploads/2023/08/230901_ReMade@ARI-Seminar_Hirschmann5.jpg
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DTSTART;TZID=Europe/Paris:20230929T140000
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CREATED:20230919T125130Z
LAST-MODIFIED:20230919T125131Z
UID:10000020-1695996000-1695999600@remade-project.eu
SUMMARY:Neutron techniques for in-situ/operando studies of batteries and gas turbine components
DESCRIPTION:Zoom webinar\nBy Ralph Gilles\, \nTechnical Univeristy of Munich\, Germany \nRechargeable batteries play an important role in the Green Deal activities. Using sophisticated methods\, a deeper understanding of the processes in electrochemistry is gained in order to further improve battery components and complete cells. In particular\, non-destructive studies examining Li-ion batteries in situ/operando represent a challenge that allows obtaining much more details about the charging/discharging and aging processes. \nDue to the high penetration depth and high sensitivity of neutrons to light elements such as lithium\, such a probe has become increasingly attractive in the last decade. With neutron diffraction\, the changes in a commercial 18650-type NMC (LiNi1/3Mn1/3Co1/3O2)/graphite round cell can be easily followed. For a better understanding of the charging/discharging process of the cell\, the different phases of graphite intercalation can be determined\, starting from pure graphite to LiCx phases [1]. Neutron radiography or neutron tomography were used to directly visualize electrodes\, complete cells or the electrolyte filling process in order to be able to observe spatial inhomogeneities (<100 mm) in battery cells [2]. Furthermore\, near-surface Li distributions are measured with a depth resolution of around 10 nm using the neutron depth profiling technique [3]. Contamination of elements on electrodes is detected with prompt gamma activation analysis using neutrons [4]. \nIn the field of energy conversion\, neutron scattering is a powerful tool for studying high-temperature alloys such as the well-known Ni-based superalloys or new types of alloys that go beyond this. Such alloys are used for stationary gas turbines and engines. The main goal is to increase the operating temperature\, resulting in higher efficiency and lower CO2 pollution. These alloys are measured using in-situ experiments at high temperatures [5-7] and/or under tension [8] or compression [9]\, analyzing the behavior of the hardening phases under such condition in order to further optimize the alloys. Typical parameters such as size distribution\, morphology\, volume fraction\, precipitation resolution and phase formation are determined in real bulk samples using neutron diffraction and small-angle neutron scattering. \n  \nReferences: \n[1] V. Zinth\, von Lüders\, M. Hofmann\, J. Hattendorff\, I. Buchberger\, S. Erhard\, J. Rebelo Kornmeier\, A. Jossen\, R. Gilles\, J. Power Sources (2014)\, 271\, 152. \n[2] T. Knoche\, \, V. Zinth\, M. Schulz\, J. Schnell\, R. Gilles\, G. Reinhart\, Journal of Power Sources 2016\, 331\, 267. \n[3] M. Wetjen\, M. Trunk\, L. Werner\, R. Gernhäuser\, B. Märkisch\, R. Gilles\, H.A. Gasteiger\, J. Electrochem. Soc (2018)\, 165(10)\, A2340. \n[4] I. Buchberger\, S. Seidlmayer\, A. Pokharel\, M. Piana\, J. Hattendorff\, P. Kudejova\, R. Gilles\, H. A. Gasteiger\, Journal of Electrochemical Society (2015)\, 162 (14) A2737. \n[5] C.Solís\, J. Munke\, M. Hofmann\, S. Mühlbauer\, M. Bergner\, B. Gehrmann\, J. Rösler\, R. Gilles\, Metall.&Mater. Trans. A\, (2018)\, 49\, 4373. \n[6] R. Gilles\, D. Mukherji\, L. Karge\, P. Strunz\, P. Beran\, B. Barbier\, A. Kriele\, M. Hofmann\, H. Eckerlebe\, J. Rösler\, J. Appl. Cryst. (2016)\, 49\, 1253. \n[7] C. Solis\, A. Kirchmayer\, I. da Silva\, F. Kümmel\, S. Mühlbauer\, P. Beran\, B. Gehrmann\, M. Hafez\, S. Neumeier\, R. Gilles\, J. Alloys Compd (2022)\, 928\, 167203. \n[8] R. Gilles\, Journal of surface investigation X-ray synchrotron and neutron techniques (2020) \n14\, S69. \n[9] F. Kümmel\, F. Kümmel\, A. Kirchmayer\, C. Solis\, M. Hofmann\, S. Neumeier\, R. Gilles\, Metals (2021)\, 11\, 719.
URL:https://remade-project.eu/index.php/event/webinar7-2/
LOCATION:Zoom (permanent link)
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://remade-project.eu/wp-content/uploads/2023/03/230929_ReMade@ARI-Seminar_Gilles-6.jpg
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