微流控
聚结(物理)
纳米颗粒
材料科学
下降(电信)
化学工程
微通道
肺表面活性物质
水溶液
缩颈
纳米技术
双水相体系
皮克林乳液
粒径
粒子(生态学)
润湿
化学
复合材料
有机化学
工程类
地质学
物理
海洋学
天体生物学
电信
计算机科学
作者
Craig Priest,Mathew D. Reid,Catherine P. Whitby
标识
DOI:10.1016/j.jcis.2011.07.060
摘要
The formation and stability of drops in the presence of nanoparticles was studied in a microfluidic device to directly observe the early stages of Pickering emulsification (low interfacial coverage). We observed several key differences between oil droplet necking and rupture in aqueous phases of nanoparticles (methylated silica) and well-characterised surfactant systems. The presence of particles did not influence drop formation dynamics and thus the size of the drops generated. In addition, observations of in-channel drop stability shortly after formation (several milliseconds) indicated that particles in the aqueous phase slow film thinning processes, but do not prevent coalescence. In contrast, downstream collection and densification (at the microchannel outlet), showed that particle-stabilised drops do not coalesce for several weeks, above a critical particle concentration. The implications of our results for droplet microfluidics and our understanding of conventional emulsification systems are discussed.
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