Novel Oil‐in‐Water Emulsions Stabilised by Ionic Surfactant and Similarly Charged Nanoparticles at Very Low Concentrations |
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| Authors: | Maodong Xu Dr Jianzhong Jiang Dr Xiaomei Pei Dr Binglei Song Prof Zhenggang Cui Prof Bernard P Binks |
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| Affiliation: | 1. The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, Jiangsu, P. R. China;2. School of Biological and Chemical Engineering, Anhui Polytechnic University, Wuhu, P. R. China;3. School of Mathematics and Physical Sciences, University of Hull, Hull, U.K. |
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| 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. |
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| Keywords: | alumina nanoparticles cetyltrimethyl ammonium bromide (CTAB) electrical repulsion emulsions |
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