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Issue 23, 2018
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Interactions between amphoteric surfaces with strongly overlapping double layers

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Abstract

The entropic repulsion between strongly overlapping electrical double-layers from two parallel amphoteric plates is described via the Donnan equilibrium in the limit of zero electric field. The plates feature charge-regulation and the inter-plate solution is in equilibrium with a reservoir of a monovalent electrolyte solution. A finite electric potential and disjoining pressure is found at contact between the plates, due to a complete discharging of the plates. For low potentials, the decay of potential and pressure is fully governed by a characteristic length scale and the contact potential. Additionally, for large separations we find a universal inverse square decay of disjoining pressure, irrespective of the contact potential. The results of the Donnan theory show quantitative agreement with self-consistent field computations that solve the full Poisson equation.

Graphical abstract: Interactions between amphoteric surfaces with strongly overlapping double layers

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Publication details

The article was received on 29 Mar 2018, accepted on 18 May 2018 and first published on 28 May 2018


Article type: Paper
DOI: 10.1039/C8SM00662H
Citation: Soft Matter, 2018,14, 4702-4710
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    Interactions between amphoteric surfaces with strongly overlapping double layers

    M. Vis, R. Tuinier, B. W. M. Kuipers, A. Vrij and A. P. Philipse, Soft Matter, 2018, 14, 4702
    DOI: 10.1039/C8SM00662H

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