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Dry oil powders and oil foams stabilised by fluorinated clay platelet particles

Binks, Bernard P.; Sekine, Tomoko; Tyowua, Andrew T.

Authors

Tomoko Sekine

Andrew T. Tyowua



Abstract

A series of platelet sericite particles coated to different extents with a fluorinating agent has been characterised and their behaviour in mixtures with air and oil studied. The material which forms by vigorous shaking depends on both the surface tension of the oil and the surface energy of the particles which control their degree of wetting. Oil dispersions are formed in liquids of relatively low tension (<22 mN m−1), e.g. hexane and cyclomethicone, for all particles. Particle-stabilised air-in-oil foams form in liquids of higher tension, e.g. dodecane and phenyl silicone, where the advancing three-phase contact angle θ, measured on a planar substrate composed of the particles into the liquid, lies between ca. 65° and 120°. For oils of tension above 27 mN m−1 like squalane and liquid paraffin with particles for which θ > 70°, we have discovered that dry oil powders in which oil drops stabilised by particles dispersed in air (oil-in-air) can be prepared by gentle mixing up to a critical oil : particle ratio (COPR) and do not leak oil. These powders, containing up to 80 wt% oil, release the encapsulated oil when sheared on a substrate. For many of the systems forming oil powders, stable liquid oil marbles can also be prepared. Above the COPR, catastrophic phase inversion occurs yielding an ultra-stable air-in-oil foam. We thus demonstrate the ability to disperse oil drops or air bubbles coated with particles within novel materials.

Journal Article Type Article
Publication Date Jan 28, 2014
Journal Soft matter
Print ISSN 1744-683X
Electronic ISSN 1744-6848
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 10
Issue 4
Pages 578-589
Institution Citation Binks, B. P., Sekine, T., & Tyowua, A. T. (2014). Dry oil powders and oil foams stabilised by fluorinated clay platelet particles. Soft matter, 10(4), 578-589. https://doi.org/10.1039/c3sm52748d
DOI https://doi.org/10.1039/c3sm52748d
Keywords Dry oil, Oil foam
Publisher URL http://pubs.rsc.org/en/content/articlelanding/2014/sm/c3sm52748d#!divAbstract
Copyright Statement This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.
Additional Information Copy of article first published in: Soft matter, 2014, v.10, issue 4

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Copyright Statement
This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.





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