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

Abstract

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.

24 pages, 3 figures

References in corpus (3)

• Critical Casimir effect in classical binary liquid mixtures
• Solvation Effects in Near-Critical Binary Mixtures
• Phase-separation in ion-containing mixtures in electric fields

Cited by in corpus (10)

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• Structure and aggregation of colloids immersed in critical solvents
• Solvation Effects in Phase Transitions in Soft Matter
• Molecular dynamics simulation of a binary mixture near the lower critical point
• Microphase separation in oil-water mixtures containing hydrophilic and hydrophobic ions
• Origin of attraction between likely charged hydrophobic and hydrophilic walls confining near-critical binary aquaeous mixture with ions