Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 57, Issue 26, Pages 7738-7742Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201802266
Keywords
alumina; nanoparticles; cetyltrimethyl ammonium bromide (CTAB); electrical repulsion; emulsions
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Funding
- National Natural Science Foundation of China [NSFC 21573096, 21473080]
- MOE SAFEA [B13025]
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Novel oil-in-water (O/W) emulsions are prepared which are stabilised by a cationic surfactant in combination with similarly charged alumina nanoparticles at concentrations as low as 10(-5) m and 10(-4) wt %, respectively. The surfactant molecules adsorb at the oil-water interface to reduce the interfacial tension and endow droplets with charge ensuring electrical repulsion between them, whereas the charged particles are dispersed in the aqueous films between droplets retaining thick lamellae, reducing water drainage and hindering flocculation and coalescence of droplets. This stabilization mechanism is universal as it occurs with different oils (alkanes, aromatic hydrocarbons and triglycerides) and in mixtures of anionic surfactant and negatively charged nanoparticles. Further, such emulsions can be switched between stable and unstable by addition of an equimolar amount of oppositely charged surfactant which forms ion pairs with the original surfactant destroying the repulsion between droplets.
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