Silicone oil emulsions stabilized by semi-solid nanostructures entrapped at the interface

Journal of Colloid and Interface Science
Yoon Sung NamHan Kon Kim

Abstract

Oil-in-water (O/W) emulsions are typically stabilized using water-soluble surfactants, which anchor to the surface of oil droplets dispersed in an aqueous solution. The structure of the anchored surfactants is often susceptible to physical and chemical stresses because of their highly mobile properties. Here we introduce a new approach to prepare stable silicone oil emulsions under various external stresses using a water-insoluble amphiphilic block copolymer, poly(ethylene oxide)-b-poly(epsilon-caprolactone) (PEO-b-PCL). Above the melting temperature (around 60 degrees C) of the hydrophobic segment (PCL), PEO-b-PCL can be dissolved in silicone oil. When the polymer/oil mixture is dispersed in water, PEO-b-PCL is irreversibly reorganized into solid nanostructures at the interface of the aqueous/organic phases. The resulting interfacial structures provide a robust physical barrier to the emulsion coarsening processes. Accordingly, the prepared emulsions exhibit excellent structural tolerance against external stresses, including variations in pH, ionic strength, and temperature.

References

May 17, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·D ExerowaTharwat Tadros
Feb 7, 2007·Langmuir : the ACS Journal of Surfaces and Colloids·D ExerowaTh Tadros
Apr 17, 2007·Journal of Colloid and Interface Science·Jérémie NestorTharwat Tadros
Nov 27, 2007·Journal of Colloid and Interface Science·Stoyan I KarakashevAnh V Nguyen
Dec 7, 2007·Journal of Colloid and Interface Science·Roman M Balabin, Rustem Z Syunyaev

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