Solvation Effects in Near-Critical Binary Mixtures

Details Solvation Effects in Near-Critical Binary Mixtures Solvation Effects in Near-Critical Binary Mixtures

2004-05-25

arxiv.org/abs/cond-mat/0405575v1

Physics

Condensed Matter

Soft Condensed Matter

12 pages, 8 figures, to be published in J. Chem. Phys

Scientific paper

10.1063/1.1769357

A Ginzburg-Landau theory is presented to investigate solvation effects in near-critical polar fluid binary mixtures. Concentration-dependence of the dielectric constant gives rise to a shell region around a charged particle within which solvation occurs preferentially. As the critical point is approached, the concentration has a long-range Ornstein-Zernike tail representing strong critical electrostriction. If salt is added, strong coupling arises among the critical fluctuations and the ions. The structure factors of the critical fluctuations and the charge density are calculated and the phase transition behavior is discussed.

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