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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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Article information


Submitted
29 Mar 2018
Accepted
18 May 2018
First published
28 May 2018

Soft Matter, 2018,14, 4702-4710
Article type
Paper

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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