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Phase inversion of particle-stabilised perfume oil-water emulsions: experiment and theory

Binks, Bernard P.; Fletcher, Paul D. I.; Holt, Benjamin L.; Beaussoubre, Pascal; Wong, Kenneth


Paul D. I. Fletcher

Benjamin L. Holt

Pascal Beaussoubre

Kenneth Wong


Phase inversion of fumed silica particle-stabilised emulsions of water and perfume oil can be effected in three ways. The transitional inversion from water-in-oil (w/o) to oil-in-water (o/w) occurs upon increasing the particle hydrophilicity for 9 oils of different polarity and structure. Results are compared for systems in which particles are pre-dispersed in one of the bulk phases and for those in which a novel powdered particle method is used. Using a simple theory involving the surface energies of the various interfaces, the contact angle theta of a particle with the oil-water interface is calculated as a function of the particle hydrophilicity. Assuming phase inversion occurs at theta - 90 degrees, very good agreement is obtained for all oils between the calculated and experimental particle hydrophilicity required for inversion in the case of the powdered particle method. Inversion from o/w to w/o induced by simply increasing the particle concentration is shown to be as a result of changes in the aggregation state of the particles influencing their wettability. Finally, catastrophic phase inversion from w/o to o/w is achieved by increasing the volume fraction of water, and multiple emulsions form around inversion in a system containing only one particle type. Results of the latter two inversion routes are combined to develop an emulsion compositional map allowing a variety of emulsions with different characteristics to be described by varying the relative amounts of the three components.


Binks, B. P., Fletcher, P. D. I., Holt, B. L., Beaussoubre, P., & Wong, K. (2010). Phase inversion of particle-stabilised perfume oil-water emulsions: experiment and theory. Physical chemistry chemical physics : PCCP, 12(38), 11954-11966.

Journal Article Type Article
Acceptance Date Jun 24, 2010
Online Publication Date Aug 23, 2010
Publication Date Oct 14, 2010
Print ISSN 1463-9076
Electronic ISSN 1463-9084
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 12
Issue 38
Pages 11954-11966
Keywords Colloidal particles; Interfacial-tension
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