Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 79: Wetting, Microfluidics and Confined Liquids II
CPP 79.1: Vortrag
Freitag, 16. März 2018, 09:30–09:45, PC 203
Water Mobility in the Interfacial Quasi-Liquid Layer of Ice/Clay Nanocomposites — •Markus Mezger1,2, Hailong Li2, Julian Mars1,2, Henning Weiss2, and Wiebke Lohstroh3 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz — 2Max-Planck-Institut für Polymerforschung, Mainz — 3Heinz Maier-Leibnitz Zentrum, Garching
At solid/ice interfaces, a quasi-liquid premelting layer is formed at temperatures below the melting point of bulk water. The water mobility within this premelting layer in ice/clay nanocomposites was determined by quasi elastic neutron scattering. Connections between the translational diffusion coefficient Dt and the surface properties were studied for three clays, serving as model systems for permafrost. Below the bulk melting point, a rapid decrease of Dt is found for all systems, reaching plateau values below −4 ∘C. At this temperature, Dt in the premelting layer is reduced up to a factor of two compared to super cooled bulk water. Adjacent to charged vermiculite the lowest water mobility was observed, followed by kaolin and the more hydrophobic talc.