Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Poster Session I
CPP 20.62: Poster
Montag, 12. März 2018, 17:30–19:30, Poster A
Structure of ice/clay nanocomposites — •Hailong Li1, Rika Unkelbach1,2, Julian Mars1,2, Ann-Christin Dippel3, Olof Gutowski3, Veijo Honkimäki4, and Markus Mezger1,2 — 1Institut für Physik, Johannes Gutenberg-Universität Mainz — 2Max-Planck-Institut für Polymerforschung, Mainz — 3Deutsches Elektronen-Synchrotron DESY, Hamburg — 4ESRF-The European Synchrotron, Grenoble
Material properties of permafrost strongly depend on the texture of the confined crystalline ice and the properties the quasi-liquid premelting layer (qll) formed at ice/solid interfaces. The layered sheet silicates vermiculite and kaolin with high interface to volume ratios are ideal model systems to study interfacial melting in geologically relevant ice/clay composites. The crystalline ice fraction and its preferred orientation was determined by temperature dependent x-ray diffraction experiments. Well below the melting point of bulk water, the formation of a qll is observed. The temperature dependent thickness of this qll follows a logarithmic growth law. However, different coefficients are observed for the charged vermiculite and uncharged kaolin clays.