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SurfactantsIn Solution, at Interfaces and in Colloidal Dispersions$
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Bob Aveyard

Print publication date: 2019

Print ISBN-13: 9780198828600

Published to Oxford Scholarship Online: December 2019

DOI: 10.1093/oso/9780198828600.001.0001

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PRINTED FROM OXFORD SCHOLARSHIP ONLINE (oxford.universitypressscholarship.com). (c) Copyright Oxford University Press, 2021. All Rights Reserved. An individual user may print out a PDF of a single chapter of a monograph in OSO for personal use. date: 20 September 2021

Emulsions stabilized by solid particles

Emulsions stabilized by solid particles

(p.501) 18 Emulsions stabilized by solid particles

Bob Aveyard

Oxford University Press

Adsorbed solid particles can stabilize (Pickering) emulsions and multiple emulsions very effectively. For roughly equal volumes of oil and water, together with solid particles, the ‘preferred’ emulsion type depends on the relative wettability of the particles by oil and water. Hydrophobic particles tend to stabilize W/O emulsions whereas hydrophilic particles favour O/W emulsions. Emulsions can be inverted from one type to the other either by changing the liquid volume fractions or the (mean) wettability of the particles. The latter method is analogous to changing the HLB in surfactant-stabilized emulsions. The possibility of forming thermodynamically (rather than kinetically) stable emulsions if (i) the line tension in the three-phase contact line around adsorbed particles is negative, and (ii) when Janus particles are used, is explored. Finally some other structures that can be stabilized by solid particles are mentioned.

Keywords:   emulsion inversion, emulsion type, Janus particles, line tension, liquid volume fraction, multiple emulsions, particle wettability, Pickering emulsion, solid-stabilized emulsion, thermodynamic stability

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