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Active colloidal particles at fluid-fluid interfaces
Current Opinion in Colloid & Interface Science ( IF 8.9 ) Pub Date : 2017-10-31 , DOI: 10.1016/j.cocis.2017.10.001
Wenjie Fei , Yang Gu , Kyle J.M. Bishop

This review explores the intersection between two important fields of colloid and interface science – that of active colloidal particles and of (passive) particles at fluid-fluid interfaces. The former uses energy input at the particle level to propel particle motions and direct dynamic assemblies. The latter relies on the spontaneous adsorption of particles at fluid interfaces to modify the interfacial energy, rheology, and permeability of biphasic materials. Here, we address two key questions that connect these otherwise distinct fields of study. How do liquid interfaces influence the dynamics of active or driven colloidal particles? How can particle activity influence the dynamics of liquid interfaces? These questions motivate the pursuit of active particle surfactants that move and organize at fluid interfaces to perform useful functions such as enhancing mass transport or modulating interfacial properties. Drawing examples from the literature, we discuss how fluid interfaces can provide a unique environment for the study of active colloids, how surface tension can be harnessed to propel particle motions, and how capillary interactions can be activated to achieve dynamically tunable emulsions and foams. We highlight opportunities for the future study and application of active particles at liquid interfaces.



中文翻译:

流体界面处的活性胶体颗粒

这篇评论探讨了胶体和界面科学的两个重要领域之间的交集–活性胶体颗粒和流体-流体界面处的(无源)颗粒。前者使用在粒子级别输入的能量来推动粒子运动并引导动态装配。后者依赖于流体界面上颗粒的自发吸附来改变界面能量,流变学和双相材料的渗透性。在这里,我们将解决两个关键问题,这些问题将这些本来就不同的研究领域联系起来。液体界面如何影响活性或驱动胶体颗粒的动力学?粒子活动如何影响液体界面的动力学?这些问题促使人们追求活性颗粒表面活性剂,它们在流体界面处移动和组织,以执行有用的功能,例如增强质量传输或调节界面性能。从文献中抽取实例,我们讨论了流体界面如何为活性胶体的研究提供独特的环境,如何利用表面张力推动颗粒运动,以及如何激活毛细相互作用以实现动态可调的乳液和泡沫。我们重点介绍了未来研究和在液体界面上应用活性颗粒的机会。从文献中抽取实例,我们讨论了流体界面如何为活性胶体的研究提供独特的环境,如何利用表面张力推动颗粒运动,以及如何激活毛细相互作用以实现动态可调的乳液和泡沫。我们重点介绍了未来研究和在液体界面上应用活性颗粒的机会。从文献中抽取实例,我们讨论了流体界面如何为活性胶体的研究提供独特的环境,如何利用表面张力推动颗粒运动,以及如何激活毛细相互作用以实现动态可调的乳液和泡沫。我们重点介绍了未来研究和在液体界面上应用活性颗粒的机会。

更新日期:2017-12-14
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