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

Horozov, Tommy; Binks, Bernard P; Gottschalk-Gaudig, Torsten

Authors

Torsten Gottschalk-Gaudig



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. occulation concentration of the suspension (similar to 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.

Journal Article Type Article
Publication Date Dec 28, 2007
Journal Physical chemistry chemical physics
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 9
Issue 48
Pages 6398 - 6404
APA6 Citation Horozov, T., Binks, B. P., & Gottschalk-Gaudig, T. (2007). Effect of electrolyte in silicone oil-in-water emulsions stabilised by fumed silica particles. Physical chemistry chemical physics : PCCP, 9(48), 6398 - 6404. https://doi.org/10.1039/b709807n
DOI https://doi.org/10.1039/b709807n
Publisher URL https://pubs.rsc.org/en/content/articlelanding/2007/CP/b709807n#!divAbstract
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