Electrocoalescence Mechanisms of Microdroplets Using Localized Electric Fields in Microfluidic Channels
Electrocoalescence Mechanisms of Microdroplets Using Localized Electric Fields in Microfluidic Channels
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DOI：
10.1021/la101517t
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发表时间：
2010-09-21
期刊：
影响因子：
3.9
通讯作者：
Cooper, Jonathan M.
中科院分区：
文献类型：
--
作者：
Zagnoni, Michele;Le Lain, Guillaume;Cooper, Jonathan M.
微流控通道中油包水微滴的电聚结是一种主动技术，可以在芯片实验室应用中实现基于二极体的混合功能。我们通过改变相的物理和流体动力学条件，报告了液滴对电聚结行为的理论和实验描述。我们的结果表明，局部电场系统可以可靠地用于液滴成对合并。不管液滴之间的距离如何，聚结行为取决于被厚油层隔开的水滴的连续相的粘度，以及靠近的液滴的界面张力。我们表明，这些系统具有大量高通量应用的潜力，并且与文献中其他活性系统的例子不同，液滴同步的需要和高电压的应用大大减少
Electrocoalescence of water-in-oil microdroplets in microfluidic channels is an active technique that enables dioplet-based mixing functionalities to be achieved in lab-on-a-chip applications In this work, a characterization of the electrocoalescence mechanisms of water microdroplets in oil is presented, using localized electric field systems We report a theoretical and experimental description of the electrocoalscence behavior of droplet pairs by varying the physical and fluid dynamic conditions of the phases Our results demonstrate that localized electric field systems can be reliably used to merge droplets in pairs, regardless of the distance between the drops The coalescence behavior was dependent upon the viscosity of the continuous phase for water droplets that were separated by a thick layer of oil and upon interfacial tension for droplets that were in close proximity We showed that these systems have the potential to be used lot high-throughput applications and that, unlike other examples of active systems in the literature, the need of droplet synchronization and the application of high voltages is considerably reduced