Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2008-03-13
Phys. Rev. E 77, 051205 (2008).
Physics
Condensed Matter
Soft Condensed Matter
19 pages, 4 figures
Scientific paper
10.1103/PhysRevE.77.051205
We obtain a fundamental measure density functional for mixtures of parallel hard cylinders. To this purpose we first generalize to multicomponent mixtures the fundamental measure functional proposed by Tarazona and Rosenfeld for a one-component hard disk fluid, through a method alternative to the cavity formalism of these authors. We show the equivalence of both methods when applied to two-dimensional fluids. The density functional so obtained reduces to the exact density functional for one-dimensional mixtures of hard rods when applied to one-dimensional profiles. In a second step we apply an idea put forward some time ago by two of us, based again on a dimensional reduction of the system, and derive a density functional for mixtures of parallel hard cylinders. We explore some features of this functional by determining the fluid-fluid demixing spinodals for a binary mixture of cylinders with the same volume, and by calculating the direct correlation functions.
Capitan Jose A.
Cuesta Jos'e A.
Martinez-Raton Yuri
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