DC-biased AC-electrokinetics: a conductivity gradient driven fluid flow
DC-biased AC-electrokinetics: a conductivity gradient driven fluid flow
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DOI：
10.1039/c1lc20495e
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发表时间：
2011-01-01
期刊：
影响因子：
6.1
通讯作者：
Rodriguez, Isabel
中科院分区：
文献类型：
--
作者：
Ng, Wee Yang;Ramos, Antonio;Rodriguez, Isabel
本文研究了基于直流偏置交流电动力学的流体流动控制原理。该方法利用与电解质溶液接触的微流体通道中的平面平行电极，其中DC偏置AC电信号施加到电极对。由于施加DC偏压，发生初期法拉第电解反应，导致本体溶液的离子含量增加。发现离子含量在通道的阴极侧和阳极侧是不同的，并且对于2 V-DC测量到约10%的电导率差异。通过DC偏置的AC电信号作用于跨微通道产生的横向电导率梯度的作用来产生流体流。对诱导流的旋涡形式进行了实验表征，并从理论上对实验结果进行了验证。在所采用的实验条件下，诱导流涡流的速度类似于600至700 μ m·s（-1），这比在常规AC-电渗和AC-电渗流类型的流中获得的速度快。
This paper studies the principles of fluid flow manipulation based on DC-biased AC-electrokinetics. This method makes use of planar parallel electrodes in a microfluidic channel in contact with an electrolyte solution, with a DC biased AC electrical signal applied to the electrode pair. Due to the application of DC bias, incipient Faradaic electrolytic reactions take place resulting in an increase of the ionic content of the bulk solution. The ionic content was found to be dissimilar at the cathodic and anodic sides of the channel and a conductivity difference of approximately 10% was measured for 2 V-DC. Fluid flow is generated by the action of the DC biased AC electric signal acting on the transverse conductivity gradient generated across the microchannel. The induced flow in the form of vortex was characterized experimentally and the results substantiated theoretically. The velocity of the induced flow vortex under the employed experimental conditions was similar to 600 to 700 mu m s(-1) which is faster than those obtained in conventional AC-electroosmosis and AC-electrothermal types of flows.