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Scientific article
English

Interactions between silica particles in the presence of multivalent coions

Published inSoft Matter, vol. 13, no. 34, p. 5741-5748
Publication date2017
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.

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Citation (ISO format)
STOJIMIROVIC, Biljana, VALMACCO, Valentina, TREFALT, Gregor. Interactions between silica particles in the presence of multivalent coions. In: Soft Matter, 2017, vol. 13, n° 34, p. 5741–5748. doi: 10.1039/C7SM01168G
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ISSN of the journal1744-683X
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