Electrically initiated upstream coalescence cascade of droplets in a microfluidic flow.
Electrically initiated upstream coalescence cascade of droplets in a microfluidic flow.
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DOI：
10.1103/physreve.80.046303
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发表时间：
2009-10
期刊：
影响因子：
--
通讯作者：
M. Zagnoni;C. Baroud;J. Cooper
中科院分区：
文献类型：
--
作者：
M. Zagnoni;C. Baroud;J. Cooper
两相微流控系统产生的尺寸控制的微滴最近出现作为强大的工具，以实现高通量化学和生物测定的液体区室化。乳液电聚结是一种去稳定化过程，可用于基于液滴的水相分离平台，以实现生物技术中的芯片实验室应用，包括颗粒或细胞回收。在本文中，我们报告了一系列的现象与电聚结的水微滴在油中的人口在微流体。在我们的实验中，我们形成的微滴的大小和分散在通道中的变化，根据两相的流速比。不同类型的液滴之间的电聚结得到。对于低的施加电压，液滴合并成对的电极区域;对于较高的值的施加电压，级联的液滴聚结产生对流动方向，液滴尺寸的范围内，液滴在通道中的横向分布和局部电场。
Two phase microfluidic systems creating size-controlled microdroplets have recently emerged as powerful tools to achieve liquid compartmentalization for high throughput chemical and biological assays. Emulsion electrocoalescence is a destabilization process that can be used in droplet-based platforms for water phase separation to enable lab-on-a-chip applications in biotechnology, including particle or cell recovery. In this paper, we report upon a series of phenomena associated with electrocoalescence of water microdroplet-in-oil populations in microfluidics. In our experiments, we formed microdroplets whose size and dispersion in the channel were varied according to the ratio of the flow rates of the two phases. Different types of electrocoalescence between droplets were obtained. For low applied voltages, drops merged in pairs over the electrode region; for higher values of the applied voltage, a cascade of droplet coalescence was produced against the flow direction, for a range of droplet sizes, lateral distributions of droplets in the channel and localized electric fields.