期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 345, 期 1-3, 页码 195-201出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.colsurfa.2009.05.001
关键词
Emulsion inversion; Surfactant; Nanoparticle; Solid-stabilised emulsion; Double inversion
资金
- Unilever Corporate Research
The double inversion of emulsions from oil-in-water(o/w) to water-in-oil (w/o) and back to o/w is a novel approach developed using oppositely charged mixtures of solid particles and surfactant molecules [B.P. Binks, J.A. Rodrigues, Angew. Chem. Int. Ed. 46 (2007) 5389]. This work extends these preliminary results reported for the cationic surfactant di-decyldimethylammonium bromide (di-C(10)DMAB), by studying the influence of surfactant chain length for symmetrical cationic surfactants. Two double-chain surfactants with hydrocarbon chain lengths of 8 or 12 are used here to stabilise emulsions with dodecane in the presence of silica nanoparticles (Ludox HS-30). Double inversion of emulsions is also possible with these surfactants. However, multiple emulsions of both types are observed when the most hydrophobic surfactant di-C(12)DMAB is used, occurring near the boundaries of the first and second inversion, respectively. A phase diagram is introduced, in which the double inversion of emulsions occurs at various particle-to-surfactant ratios, in particular at low concentrations of silica particles between 0.1 and 4 wt.%. (C) 2009 Elsevier B.V. All rights reserved.
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