Distribution of ions near a charged selective surface in critical binary solvents

Details Distribution of ions near a charged selective surface in critical binary solvents Distribution of ions near a charged selective surface in critical binary solvents

2010-01-11

arxiv.org/abs/1001.1721v1

Physics

Condensed Matter

Statistical Mechanics

24 pages, 3 figures

Scientific paper

Near-critical binary mixtures containing ionic solutes near a charged wall preferentially adsorbing one component of the solvent are studied. Within the Landau-Ginzburg approach extended to include electrostatic interactions and the chemical preference of ions for one component of the solvent, we obtain a simple form for the leading-order correction to the Debye-Huckel theory result for the charge density profile. Our result shows that critical adsorption influences significantly distribution of ions near the wall. This effect may have important implications for the screening of electrostatic interactions between charged surfaces immersed in binary near-critical solvents.

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