The thickness of a liquid layer on the free surface of ice as obtained from computer simulation

Details The thickness of a liquid layer on the free surface of ice as obtained from computer simulation The thickness of a liquid layer on the free surface of ice as obtained from computer simulation

2009-01-13

arxiv.org/abs/0901.1844v1

J.Chem.Phys. 129 014702 (2008)

Physics

Condensed Matter

Other Condensed Matter

41 pages and 13 figures

Scientific paper

10.1063/1.2940195

Molecular dynamic simulations were performed for ice Ih with a free surface by using four water models, SPC/E, TIP4P, TIP4P/Ice and TIP4P/2005. The behavior of the basal plane, the primary prismatic plane and of the secondary prismatic plane when exposed to vacuum was analyzed. We observe the formation of a thin liquid layer at the ice surface at temperatures below the melting point for all models and the three planes considered. For a given plane it was found that the thickness of a liquid layer was similar for different water models, when the comparison is made at the same undercooling with respect to the melting point of the model. The liquid layer thickness is found to increase with temperature. For a fixed temperature it was found that the thickness of the liquid layer decreases in the following order: the basal plane, the primary prismatic plane, and the secondary prismatic plane. For the TIP4P/Ice model, a model reproducing the experimental value of the melting temperature of ice, the first clear indication of the formation of a liquid layer appears at about -100 Celsius for the basal plane, at about -80 Celsius for the primary prismatic plane and at about -70 Celsius for the secondary prismatic plane.

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