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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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Publication details

The article was received on 13 Jun 2017, accepted on 22 Jul 2017 and first published on 25 Jul 2017


Article type: Paper
DOI: 10.1039/C7SM01168G
Citation: Soft Matter, 2017, Advance Article
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    Interactions between silica particles in the presence of multivalent coions

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

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