Regensburg 2019 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 20: Wetting, Fluidics and Liquids at Interfaces and Surfaces (joint session CPP/DY)
CPP 20.3: Vortrag
Dienstag, 2. April 2019, 10:00–10:15, H13
Interfacial premelting of ice in nano composite materials — •Markus Mezger1,2, Hailong Li1, Julian Mars1,2, and Markus Bier3,4 — 1Max Planck Institute for Polymer Research, Mainz — 2Institute of Physics, Johannes Gutenberg University Mainz — 3Max Planck Institute for Intelligent Systems, Stuttgart — 4University of Applied Sciences Würzburg-Schweinfurt
The interfacial premelting in ice/clay nano composites was studied by high energy X-ray diffraction.
Below the melting point of bulk water, the formation of liquid water was observed for the ice/vermiculite and ice/kaolin system.
For the quantitative description of the molten water fraction in wet clay minerals we developed a continuum model for short range interactions and arbitrary pore size distributions.
This model quantitatively describes the experimental data over the entire temperature range.
Model parameters were obtained by fitting using a maximum entropy approach.
Pronounced differences in the deviation from Antonow’s rule relating interfacial free energy between ice, water, and clay are observed for the charged vermiculite and uncharged kaolin minerals.
The resultant parameters are discussed in terms of their ice nucleation efficiency.
Using well defined and characterized ice/clay nano composite samples, this work bridges the gap between studies on single crystalline ice/solid model interfaces and naturally occurring soils and permafrost.
H. Li et al., Phys. Chem. Chem. Phys. DOI: 10.1039/c8cp05604h (2018)