Local size segregation in polydisperse hard sphere fluids

Details Local size segregation in polydisperse hard sphere fluids Local size segregation in polydisperse hard sphere fluids

1999-09-23

arxiv.org/abs/cond-mat/9909339v1

Physics

Condensed Matter

Soft Condensed Matter

RevTeX, 4 pages, 3 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.84.911

The structure of polydisperse hard sphere fluids, in the presence of a wall, is studied by the Rosenfeld density functional theory. Within this approach, the local excess free energy depends on only four combinations of the full set of density fields. The case of continuous polydispersity thereby becomes tractable. We predict, generically, an oscillatory size segregation close to the wall, and connect this, by a perturbation theory for narrow distributions, with the reversible work for changing the size of one particle in a monodisperse reference fluid.

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