Weighted-density approximation for general nonuniform fluid mixtures

Details Weighted-density approximation for general nonuniform fluid mixtures Weighted-density approximation for general nonuniform fluid mixtures

1999-03-10

arxiv.org/abs/cond-mat/9903158v1

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, to appear in Phys. Rev. E as Brief Report

Scientific paper

10.1103/PhysRevE.60.3417

In order to construct a general density-functional theory for nonuniform fluid mixtures, we propose an extension to multicomponent systems of the weighted-density approximation (WDA) of Curtin and Ashcroft [Phys. Rev. A 32, 2909 (1985)]. This extension corrects a deficiency in a similar extension proposed earlier by Denton and Ashcroft [Phys. Rev. A 42, 7312 (1990)], in that that functional cannot be applied to the multi-component nonuniform fluid systems with spatially varying composition, such as solid-fluid interfaces. As a test of the accuracy of our new functional, we apply it to the calculation of the freezing phase diagram of a binary hard-sphere fluid, and compare the results to simulation and the Denton-Ashcroft extension.

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