Induced-charge electrokinetics, bipolar current, and concentration polarization in a microchannel-Nafion-membrane system
Induced-charge electrokinetics, bipolar current, and concentration polarization in a microchannel-Nafion-membrane system
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DOI：
10.1103/physreve.93.062614
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发表时间：
2016-06-29
影响因子：
2.4
通讯作者：
Yossifon, Gilad
中科院分区：
文献类型：
--
作者：
Park, Sinwook;Yossifon, Gilad
由于跨微通道-膜界面装置的浓差极化而形成的位于耗尽层内的浮动电极阵列的存在不仅可以产生感应电荷电渗（ICEO），而且可以产生由感应法拉第反应产生的双极电流。已经表明，存在薄介电涂层的最佳厚度，该厚度足以抑制双极电流，但仍然使ICEO涡旋能够搅动耗尽层，从而影响系统的电流-电压响应。此外，通过激活电极使用交流电渗透导致流体搅拌的进一步增强，并为耗尽层长度的按需时空控制开辟了新的途径。
The presence of a floating electrode array located within the depletion layer formed due to concentration polarization across a microchannel-membrane interface device may produce not only induced-charge electro-osmosis (ICEO) but also bipolar current resulting from the induced Faradaic reaction. It has been shown that there exists an optimal thickness of a thin dielectric coating that is sufficient to suppress bipolar currents but still enables ICEO vortices that stir the depletion layer, thereby affecting the system's current-voltage response. In addition, the use of alternating-current electro-osmosis by activating electrodes results in further enhancement of the fluid stirring and opens new routes for on-demand spatiotemporal control of the depletion layer length.