Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-02-02
Physics
Condensed Matter
Statistical Mechanics
30 pages, 19 figures, submitted to J.Phys. Cond.Matt
Scientific paper
10.1088/0953-8984/16/45/004
The liquid-vapour phase transition near a weakly attractive surface is studied by simulations of the coexistence curves of water in hydrophobic pores. There is a pronounced gradual density depletion of the liquid phase near the surface without any trend to the formation of a vapour layer below the bulk critical temperature Tc. The temperature dependence of the order parameter in the surface layer follows the power law (rol - rov) ~ (1 - T/Tc)^beta1 with a value of the exponent beta1 close to the critical exponent beta1 = 0.82 of the ordinary transition in the Ising model. The order parameter profiles in the subcritical region are consistent with the behaviour of an ordinary transition and their temperature evolution is governed by the bulk correlation length. Density profiles of water at supercritical temperatures are consistent with the behaviour of the normal transition caused by the preferential adsorption of voids. The relation between normal and ordinary transitions in the Ising model and in fluids is discussed.
Brovchenko Ivan
Geiger Alfons
Oleinikova Alla
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