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Effects of temperature on water-in-oil emulsions stabilised solely by wax microparticles

Binks, Bernard P.; Rocher, Anaïs

Authors

Anaïs Rocher

Abstract

The possibility of stabilising oil-water mixtures using wax particles alone is reported. As judged from contact angle measurements, wax particles are hydrophobic and act as effective emulsifiers of water-in-squalane emulsions. Specific differences exist depending on the chemical composition of the particles. The effect of temperature on emulsion stability has been explored in detail. If particles are pre-adsorbed to water drop interfaces by emulsification at room temperature, subsequent increase of temperature leads to a progressive increase in sedimentation and coalescence as particles melt and desorb from interfaces. The temperature range over which this occurs is similar to that of the melting range of the particles alone. If however the particles are melted prior to emulsification, surface-active long chain ester or acid molecules adsorb to freshly created interfaces giving rise to excellent stability to coalescence at high temperatures. Rapid cooling of these latter emulsions enhances their long-term stability as solidification of the molten wax leads to a thickening of the continuous oil phase. © 2009 Elsevier Inc. All rights reserved.

Journal Article Type Article
Publication Date Jul 1, 2009
Journal JOURNAL OF COLLOID AND INTERFACE SCIENCE
Print ISSN 0021-9797
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 335
Issue 1
Pages 94-104
Institution Citation Binks, B. P., & Rocher, A. (2009). Effects of temperature on water-in-oil emulsions stabilised solely by wax microparticles. Journal of colloid and interface science, 335(1), (94-104). doi:10.1016/j.jcis.2009.03.089. ISSN 0021-9797
DOI https://doi.org/10.1016/j.jcis.2009.03.089
Keywords Colloid and Surface Chemistry; Electronic, Optical and Magnetic Materials; Surfaces, Coatings and Films; Biomaterials
Publisher URL https://www.sciencedirect.com/science/article/pii/S0021979709004238?via%3Dihub