Wetting and drying transitions in mean-field theory: Describingthe surface parameters for the theory of Nakanishi and Fisherin terms of a microscopic model

摘要

The theory of Nakanishi and Fisher [Phys. Rev. Lett. 49, 1565 (1982)] describes the wettingbehavior of a liquid and vapor phase in contact with a substrate in terms of the surface chemicalpotential h1and the surface enhancement parameterg.Using density functional theory, we derivemolecular expressions for h1andgand compare with earlier expressions derived from Landaulattice mean-field theory. The molecular expressions are applied to compare with results fromdensity functional theory for a square-gradient fluid in a square-well fluid-substrate potential andwith molecular dynamics simulations.