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Novel oil-in-water emulsions stabilised by ionic surfactant and similarly charged nanoparticles at very low concentrations

Xu, Maodong; Jiang, Jianzhong; Pei, Xiaomei; Song, Binglei; Cui, Zhenggang; Binks, B P

Authors

Maodong Xu

Jianzhong Jiang

Xiaomei Pei

Binglei Song

Zhenggang Cui

Abstract

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.

Journal Article Type Article
Publication Date Jun 25, 2018
Print ISSN 1433-7851
Electronic ISSN 1521-3773
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 57
Issue 26
Pages 7738-7742
Institution Citation Xu, M., Jiang, J., Pei, X., Song, B., Cui, Z., & Binks, B. P. (2018). Novel oil-in-water emulsions stabilised by ionic surfactant and similarly charged nanoparticles at very low concentrations. Angewandte Chemie, 57(26), 7738-7742. https://doi.org/10.1002/anie.201802266
DOI https://doi.org/10.1002/anie.201802266
Keywords Alumina; Nanoparticles; Cetyltrimethyl ammonium bromide (CTAB); Electrical repulsion; Emulsions
Publisher URL https://onlinelibrary.wiley.com/doi/abs/10.1002/anie.201802266

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