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由石蜡和锂皂石粘土颗粒稳定的Pickering乳液。

Pickering emulsions stabilized by paraffin wax and Laponite clay particles.

作者信息

Li Caifu, Liu Qian, Mei Zhen, Wang Jun, Xu Jian, Sun Dejun

机构信息

Key Laboratory for Colloid & Interface Chemistry of Education Ministry, Shandong University, Jinan, Shandong 250100, People's Republic of China.

出版信息

J Colloid Interface Sci. 2009 Aug 1;336(1):314-21. doi: 10.1016/j.jcis.2009.03.080. Epub 2009 Apr 8.

Abstract

Emulsions containing wax in dispersed droplets stabilized by disc-like Laponite clay particles are prepared. Properties of the emulsions prepared at different temperatures are examined using stability, microscopy and droplet-size analysis. At low temperature, the wax crystals in the oil droplets can protrude through the interface, leading to droplet coalescence. But at higher temperatures, the droplet size decreases with wax concentration. Considering the viscosity of the oil phase and the interfacial tension, we conclude that the wax is liquid-like during the high temperature emulsification process, but during cooling wax crystals appear around the oil/water interface and stabilize the droplets. The oil/water ratio has minimal effect on the emulsions between ratios of 3:7 and 7:3. The Laponite is believed to stabilize the emulsions by increasing the viscosity of the continuous phase and also by adsorbing at the oil/water interface, thus providing a physical barrier to coalescence.

摘要

制备了含有蜡的乳液,其中蜡以分散的液滴形式存在,并由盘状锂皂石粘土颗粒稳定。使用稳定性、显微镜和液滴尺寸分析来研究在不同温度下制备的乳液的性质。在低温下,油滴中的蜡晶体会穿过界面突出,导致液滴聚并。但在较高温度下,液滴尺寸随蜡浓度的增加而减小。考虑到油相的粘度和界面张力,我们得出结论,在高温乳化过程中蜡呈类液态,但在冷却过程中蜡晶体会出现在油/水界面周围并使液滴稳定。油/水比在3:7至7:3之间时对乳液的影响最小。据信锂皂石通过增加连续相的粘度以及吸附在油/水界面来稳定乳液,从而为聚并提供物理屏障。

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