Calculating the surface tension of binary solutions of simple fluids of comparable size

Abstract

A molecular theory based on the lattice gas model (LGM) is used to calculate the surface tension of one- and two-component planar vapor–liquid interfaces of simple fluids. Interaction between nearest neighbors is considered in the calculations. LGM is applied as a tool of interpolation: the parameters of the model are corrected using experimental surface tension data. It is found that the average accuracy of describing the surface tension of pure substances (Ar, N₂, O₂, CH₄) and their mixtures (Ar–O₂, Ar–N₂, Ar–CH₄, N₂–CH₄) does not exceed 2%.