Energy of interaction between solid surfaces and liquids

Details Energy of interaction between solid surfaces and liquids Energy of interaction between solid surfaces and liquids

2008-01-29

arxiv.org/abs/0801.4481v1

The Journal of Physical Chemistry B 102, 7 (1998) 1212-1218

Physics

Chemical Physics

16 pages

Scientific paper

10.1021/jp9723426

We consider the wetting transition on a planar surface in contact with a semi-infinite fluid. In the classical approach, the surface is assumed to be solid, and when interaction between solid and fluid is sufficiently short-range, the contribution of the fluid can be represented by a surface free energy with a density of the form Phi(rho_s), where rho_s is the limiting density of the fluid at the surface. In the present paper we propose a more precise representation of the surface energy that takes into account not only the value of rho_s but also the contribution from the whole density profile rho(z) of the fluid, where z is the coordinate normal to the surface. The specific value of the functional of rho_s at the surface is expressed in mean-field approximation through the potentials of intermolecular interaction and some other parameters of the fluid and the solid wall. An extension to the case of fluid mixtures in contact with a solid surface is proposed.

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