Ian Wark Research Institute, University of South Australia, Mawson Lakes, South Australia, Australia.
J Colloid Interface Sci. 2011 Sep 1;361(1):170-7. doi: 10.1016/j.jcis.2011.05.046. Epub 2011 May 23.
This work reports on coalescence in oil-in-water Pickering emulsions subjected to simple shear flow. The emulsions were stabilized by silanized fumed silica particles forming layers a few hundred nanometers thick around drops that are tens of micrometers in size. The drop size and particle concentration in the emulsions were fixed, while the salt concentration was varied to adjust the colloidal interactions between the drops and particles. At rest the oil drops do not coalesce. The susceptibility of the drops to orthokinetic coalescence was found to depend on the extent of particle flocculation in the attached particle layer. The evolution of the drop size with time and shear rate was consistent with phenomenological models used to describe the behavior of emulsions under shear.
本文报告了在简单剪切流作用下的油包水 Pickering 乳液中的聚结情况。乳液由硅烷化的气相法二氧化硅颗粒稳定，这些颗粒在几十微米大小的液滴周围形成几百纳米厚的层。乳液中的液滴大小和颗粒浓度固定，而盐浓度变化以调整液滴和颗粒之间的胶体相互作用。在静止状态下，油滴不会聚结。发现油滴对同向流聚结的敏感性取决于附着颗粒层中颗粒絮凝聚的程度。液滴尺寸随时间和剪切速率的演化与用于描述剪切下乳液行为的经验模型一致。
