Emulsification: Mechanistic understanding
Emulsification: Mechanistic understanding
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DOI：
10.1016/j.tifs.2012.08.006
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发表时间：
2013-05
影响因子：
15.3
通讯作者：
Laura Lee;N. Niknafs;Robin D Hancocks;I. Norton
中科院分区：
文献类型：
--
作者：
Laura Lee;N. Niknafs;Robin D Hancocks;I. Norton
本文综述了本课题组目前在液滴破碎和合并机制方面的工作。为了做到这一点，使用了反射技术来测量不同乳化剂类型和浓度下的聚结速率。结果表明，乳化剂不能阻止液滴在流动中的聚结，聚结速率不受乳化剂种类和浓度的影响。然而，高浓度的Pickering颗粒的加入抑制了流动中的聚结，这可以用相关的高吸附能来解释。如果界面只被部分颗粒覆盖，这可能会导致相反转。比较了几种乳化技术：高压阀均化、微流化法和膜乳化法。与以前的研究相反，研究表明，膜产生的液滴比孔径小，这只有在乳化剂具有快速吸附速度的情况下才可能实现。
This paper reviews current work from our group on the mechanism of droplet break-up and coalescence. In order to do this a reflectance technique was used to measure the rate of coalescence for different emulsifier types and concentrations. It was shown that droplet coalescence in flow cannot be stopped by emulsifiers and the coalescence rate was unaffected by emulsifier type or concentration. However, addition of a high concentration of Pickering particles suppressed coalescence in flow, which can be explained by the associated high adsorption energy. If the interface is only partially covered by particles, this can result in phase inversion. These results were compared for several emulsification techniques: high pressure valve homogenisation, microfluidization and membrane emulsification. In contrast to previous studies it has been shown that membranes produce droplets smaller than the pore size, and this is only possible if the emulsifier has a fast adsorption rate.