肺表面活性物质
絮凝作用
化学工程
聚结(物理)
纳米颗粒
水溶液
阳离子聚合
化学
表面张力
吸附
油滴
离子键合
乳状液
离子
有机化学
工程类
物理
天体生物学
量子力学
作者
Maodong Xu,Jianzhong Jiang,Xiaomei Pei,Binglei Song,Zhenggang Cui,Bernard P. Binks
标识
DOI:10.1002/anie.201802266
摘要
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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