Improved Flory Formula for the Excess Free Energy of a Binary Liquid Mixture

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Abstract
A simple model for the free energy of mixing of a binary fluid is proposed using hard spheres as a reference system and a tail interaction between the unlike atoms. The model, firstly, provides an interpretation and rationale for the interchange energy parameter w and its temperature dependence occurring in the Flory formula and for a number of other current ideas. Secondly, it leads to a formula which appears to be a suitable next step in the refinement of the Flory model.
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