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Issue 36, 2012
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Interactions of neutral semipermeable shells in asymmetric electrolyte solutions

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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 ion 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 using the Poisson–Boltzmann and integral equations theories. In particular, we show that in a 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.

Graphical abstract: Interactions of neutral semipermeable shells in asymmetric electrolyte solutions

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Publication details

The article was received on 16 Mar 2012, accepted on 15 Jun 2012 and first published on 25 Jul 2012


Article type: Paper
DOI: 10.1039/C2SM25605C
Citation: Soft Matter, 2012,8, 9428-9435
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    Interactions of neutral semipermeable shells in asymmetric electrolyte solutions

    V. Lobaskin, A. N. Bogdanov and O. I. Vinogradova, Soft Matter, 2012, 8, 9428
    DOI: 10.1039/C2SM25605C

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