Regensburg 2016 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 63: Interfaces and Thin Films II (joint session CPP/DY, organized by CPP)
CPP 63.9: Vortrag
Freitag, 11. März 2016, 11:45–12:00, H51
Interfacial Melting in Ice/Nanocomposite Materials — •Hailong Li1, Julian Mars1,2, Henning Weiss1, Thomas Buslaps3, Wiebke Lohstroh4, and Markus Mezger1,2 — 1Max-Planck-Institut für Polymerforschung, Mainz, Germany — 2Institut für Physik, Johannes Gutenberg-Universität Mainz, Germany — 3ESRF-The European Synchrotron, Grenoble, France — 4Heinz Maier-Leibnitz Zentrum, Technische Universität München, Germany
The material properties of permafrost strongly depend on the molecular scale structure of the ice/solid interface. Early in 1859, Faraday proposed the existence of a quasi-liquid layer (qll) at ice surfaces. However, the understanding of the interfacial melting of ice and the structure of the qll is still under debate. Layered sheet silicates are ideal model systems to study the interfacial melting of ice in geologically relevant materials. Using x-ray diffraction, we determined the crystalline ice fraction in ice composites with high interface to volume ratio. From the anisotropy of the ice Bragg reflections in textured composite samples we extract the preferred orientation of ice crystals confined between the sheet silicates. Approaching the bulk melting point of ice, we observe a logarithmic growth law of the thickness of the qll. Quasielastic neutron scattering was employed to elucidate the mobility of the qll at hydrophilic and hydrophobic solid-ice interfaces.