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Issue 34, 2017
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Interactions between silica particles in the presence of multivalent coions

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Abstract

Forces between charged silica particles in solutions of multivalent coions are measured with colloidal probe technique based on atomic force microscopy. The concentration of 1 : z electrolytes is systematically varied to understand the behavior of electrostatic interactions and double-layer properties in these systems. Although the coions are multivalent the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory perfectly describes the measured force profiles. The diffuse-layer potentials and regulation properties are extracted from the forces profiles by using the DLVO theory. The dependencies of the diffuse-layer potential and regulation parameter shift to lower concentration with increasing coion valence when plotted as a function of concentration of 1 : z salt. Interestingly, these profiles collapse to a master curve if plotted as a function of monovalent counterion concentration.

Graphical abstract: Interactions between silica particles in the presence of multivalent coions

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Article information


Submitted
13 Jun 2017
Accepted
22 Jul 2017
First published
25 Jul 2017

Soft Matter, 2017,13, 5741-5748
Article type
Paper

Interactions between silica particles in the presence of multivalent coions

B. Uzelac, V. Valmacco and G. Trefalt, Soft Matter, 2017, 13, 5741
DOI: 10.1039/C7SM01168G

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