Journal Article10.1021/LA011420K
Solid Wettability from Surface Energy Components: Relevance to Pickering Emulsions
634
TL;DR: In this article, a theoretical treatment for the wetting of a solid particle at an oil−water interface in terms of the components of the surface energies of all three phases was developed.
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Abstract: A theoretical treatment is developed for the wetting of a solid particle at an oil−water interface in terms of the components of the surface energies of all three phases. Calculated oil−water contact angles for a solid of given hydrophobicity with a range of oils of different polarity show good agreement with experimental data. For a hydrophobically modified silica surface, oils of increasing polarity give higher oil−water contact angles measured through water. The results are in line with the effect of oil type on Pickering emulsion type where more polar oils preferentially give water-in-oil emulsions. The approach is also used to predict the type of solid particles that would be required to stabilize emulsions of two immiscible oils. For hydrocarbon−fluorocarbon pairs, it is predicted that perfluorinated particles would stabilize fluorocarbon-external emulsions while silica particles with a high coverage of hydrocarbon groups should stabilize hydrocarbon-external emulsions.
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References
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B. P. Binks and,S. O. Lumsdon +1 more
TL;DR: In this article, the influence of the wettability of spherical, nanometer-sized silica particles on the type and stability of water−toluene emulsions is described.
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The Surface Tension of Pure Liquid Compounds
TL;DR: The surface tension tables presented in this paper are the result of a literature survey, evaluation, and compilation of data of some 2200 pure liquid compounds, 226 of which were reported for a single temperature.
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