Interactions of neutral semipermeable shells in asymmetric electrolyte solutions

Abstract

We study the ionic equilibria and interactions of neutral semi-permeable spherical shells immersed in electrolyte solutions, including polyions. Although the shells are uncharged, only one type of ions of the electrolyte can permeate them, thus leading to a steric charge separation in the system. This gives rise to a charge accumulation inside the shell and a build up of concentration- dependent shell potential, which converts into a disjoining pressure between the neighboring shells. These are quantified by using the Poisson-Boltzmann and integral equations theory. In particular, we show that in case of low valency electrolytes, interactions between shells are repulsive and can be sufficiently strong to stabilize the shell dispersion. In contrast, the charge correlation effects in solutions of polyvalent ions result in attractions between the shells, with can lead to their aggregation.

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Cited by in corpus (5)

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• Electrostatic Interaction of Heterogeneously Charged Surfaces with Semipermeable Membranes
• Electrostatic Interactions and Electro-osmotic Properties of Semipermeable Surfaces
• Ion Density Deviations in Semipermeable Ionic Microcapsules
• Disjoining Pressure of an Electrolyte Film Confined between Semipermeable Membranes