Weighted-density-functional theory of nonuniform fluid mixtures: Application to the structure of binary hard-sphere mixtures near a hard wall

A computationally practical density-functional theory of nonuniform fluid mixtures ``designed primarily for the study of interfacial phenomena'' is presented and applied to the structure of a binary hard-sphere mixture near a hard wall. The theory is based on a weighted-density approximation for the one-particle direct correlation functions of the nonuniform system, and requires as input only the one- and two-particle direct correlation functions of the corresponding uniform system. Numerical results for density and concentration profiles are presented and compared with available simulation data.