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Issue 48, 2007
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Effect of electrolyte in silicone oil-in-water emulsions stabilised by fumed silica particles

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Abstract

Partially hydrophobised fumed silica particles are used to make silicone oil-in-water emulsions at natural pH of the aqueous phase. The stability and rheological properties of the emulsions and suspensions are studied at NaCl concentrations in the range 0–100 mM. It is found that all emulsions are very stable to coalescence irrespective of the NaCl concentration. However, a strong effect of electrolyte on the creaming and rheological properties is observed and linked to the particle interactions in aqueous suspensions. The creaming rate and extent are large at low electrolyte concentrations but both abruptly decrease at salt concentrations exceeding the critical flocculation concentration of the suspension (∼1 mM NaCl). The drastic improvement of the stability to creaming is attributed to the formation of a visco-elastic three-dimensional network of interconnected particles and emulsion droplets.

Graphical abstract: Effect of electrolyte in silicone oil-in-water emulsions stabilised by fumed silica particles

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Article information


Submitted
27 Jun 2007
Accepted
06 Sep 2007
First published
17 Sep 2007

Phys. Chem. Chem. Phys., 2007,9, 6398-6404
Article type
Paper

Effect of electrolyte in silicone oil-in-water emulsions stabilised by fumed silica particles

T. S. Horozov, B. P. Binks and T. Gottschalk-Gaudig, Phys. Chem. Chem. Phys., 2007, 9, 6398
DOI: 10.1039/B709807N

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