@article { , title = {Influence of surfactant structure on the double inversion of emulsions in the presence of nanoparticles}, abstract = {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.\%. © 2009 Elsevier B.V. All rights reserved.}, doi = {10.1016/j.colsurfa.2009.05.001}, issn = {0927-7757}, issue = {1-3}, journal = {COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS}, note = {Batch 003. Output ID 24031.}, pages = {195-201}, publicationstatus = {Published}, publisher = {Elsevier}, url = {https://hull-repository.worktribe.com/output/395914}, volume = {345}, keyword = {Specialist Research - Other, Colloid and Surface Chemistry}, year = {2009}, author = {Rodrigues, Jhonny A. and Binks, Bernard P.} }