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DTSTART;TZID=Europe/Paris:20250912T100000
DTEND;TZID=Europe/Paris:20250912T110000
DTSTAMP:20260413T233020
CREATED:20250514T091332Z
LAST-MODIFIED:20250923T201944Z
UID:10000065-1757671200-1757674800@remade-project.eu
SUMMARY:Structure and dynamics in cellulose-based\, electrically conductive polymer films
DESCRIPTION:Zoom webinar | Replay on Youtube\nLucas Kreuzer\,  \nHeinz Maier-Leibnitz Zentrum (MLZ\, FRM II) Technical University of Munich\, Germany \nPEDOT:PSS is a water-dispersable and electrically conductive polymer blend that is increasingly applied in numerous fields such as batteries and super-capacitors. While\nmany studies focus on performance optimization\, degradation issues because of humid environments are rarely discussed: PEDOT:PSS absorbs significant amounts of water\n(~50 wt%)\, which leads to a pronounced swelling factor of up to 1.6. \nThe integration of PEDOT:PSS into a cellulose nanofibril (CNF) matrix enhances significantly the mechanical integrity and prevents film swelling\, whereas a certain water\namount is still absorbed into the PEDOT:PSS/CNF films (~24 wt%). By studying the water dynamics under varying ambient relative humidity (RH) conditions\, we identified\ntwo water species inside the films: fast-moving bulk water and slow-moving hydration water. Under dry conditions\, bulk water is completely released from the films\, while\nsome of the hydration water remains within them. In humid environments\, both water species are present. \nThe altered water content inside the PEDOT:PSS/CNF films in dependence of RH\, leads to changing water-cellulose interactions\, structural re-arrangements\, and tunable\nelectrical conductivity. Under dry conditions\, only some hydration water is present in the films and PEDOT:PSS – CNF interactions become more dominant. As a consequence\,\nPEDOT:PSS wets on the CNF\, thereby leading to an increased conductivity. Under high RH conditions this is reversed: the high water content inside the films promotes de-\nwetting of PEDOT:PSS and the electrical conductivity decreases. \nWater – polymer interactions have been studied using quasi-elastic neutron scattering (QENS)\, while the film nano-morphology of the PEDOT:PSS/CNF films was investigated\nwith grazing-incidence small angle neutron scattering (GISANS) and time-of-flight neutron reflectivity (ToF-NR).
URL:https://remade-project.eu/index.php/event/structure-and-dynamics-in-cellulose-based-electrically-conductive-polymer-films/
CATEGORIES:Seminar
ATTACH;FMTTYPE=image/jpeg:https://remade-project.eu/wp-content/uploads/2025/05/250912_ReMade@ARI-seminar_Kreuzer.jpg
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