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

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

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. © the Owner Societies.

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

• Journal Article Type: Article
• Acceptance Date: Sep 6, 2007
• Online Publication Date: Sep 17, 2007
• Publication Date: Dec 28, 2007
• Deposit Date: Jul 15, 2019
• Journal: Physical Chemistry Chemical Physics
• Print ISSN: 1463-9076
• Publisher: Royal Society of Chemistry
• Peer Reviewed: Peer Reviewed
• Volume: 9
• Issue: 48
• Pages: 6398-6404
• DOI: https://doi.org/10.1039/b709807n
• Public URL: https://hull-repository.worktribe.com/output/391514
• Publisher URL: https://pubs.rsc.org/en/content/articlelanding/2007/CP/b709807n#!divAbstract