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An Introduction to Microscopic Theories for Inhomogeneous Liquids: Getting Started with Density Functional Theory

Author: Adam P. Hughes, Uwe Thiele, Andrew J. Archer
Url: http://arxiv.org/abs/1311.1964
Format: Ps, Pdf
Year: 2013
Category: Density Functional Theory
Pages: 64
Clicks: 1001

Classical density functional theory (DFT) is a statistical mechanical theory for calculating the density profiles of the molecules in a liquid. It is widely used, for example. to calculate the density distribution of the molecules in the vicinity of a confining wall, the interfacial tension, the wetting behaviour and many other properties of nonuniform liquids. DFT can however be somewhat daunting to students entering the field, because of the many connections to other areas of liquid-state science that are required and used to develop the theories. Here we give an introduction to some of the key ideas, based on a lattice-gas (Ising) model fluid. This builds on knowledge covered in most undergraduate statistical mechanics and thermodynamics courses and so students can quickly get to the stage of calculating density profiles, etc for themselves. We derive a simple DFT for the lattice-gas and present some typical results that can readily be calculated using the theory.

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