Attraction between like-charge surfaces in polar mixtures

S. Samin, Y. Tsori

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18 Scopus citations

Abstract

We examine the force between two charged surfaces immersed in aqueous mixtures having a coexistence curve. For a homogeneous water-poor phase, as the distance between the surfaces is decreased, a water-rich phase condenses at a distance Dt in the range 1-100 nm. At this distance the osmotic pressure can become negative leading to a long-range attraction between the surfaces. The osmotic pressure vanishes at a distance De < D t, representing a very deep metastable or globally stable energetic state. We give analytical and numerical results for Dt and D e on the Poisson-Boltzmann level.

Original languageEnglish
Article number36002
JournalEurophysics Letters
Volume95
Issue number3
DOIs
StatePublished - 1 Aug 2011

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