Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density
Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density
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DOI：
10.1021/acs.jpcc.5b03510
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发表时间：
2015-07-23
影响因子：
3.7
通讯作者：
Martin, Charles R.
中科院分区：
文献类型：
--
作者：
Bishop, Gregory W.;Lopez, Marcos M., Jr.;Martin, Charles R.
我们最近展示了一种新的动电现象——具有不对称形状孔的膜中的电渗流整流。流动整流是指在恒定的驱动力下，通过膜的一个方向的流速快于相反方向的流速。 EOF 整流可在包含多孔膜的微流体装置中实际应用，但还需要进一步的研究。我们在此探讨了两个关键实验变量（用于驱动流过膜的电流密度和膜孔密度）对 EOF 整流的影响。我们发现，通过整流比量化的 EOF 整流程度随着电流密度的增加而增加。相反，精馏比随着膜孔密度的增加而降低。我们基于简单的 EOF 和膜传输理论对这些结果提出了解释。
We have recently demonstrated a new electrokinetic phenomenon-electroosmotic flow rectification in membranes with asymmetrically shaped pores. Flow rectification means that at constant driving force the flow rate in one direction through the membrane is faster than the flow rate in the opposite direction. EOF rectification could be of practical use in microfluidic devices incorporating porous membranes, but additional research is required. We explore here the effects of two key experimental variables-current density used to drive flow through the membrane and membrane pore density-on EOF rectification. We have found that the extent of EOF rectification, as quantified by the rectification ratio, increases with increasing current density. In contrast, the rectification ratio decreases with increasing membrane pore density. We propose explanations for these results based on simple EOF and membrane-transport theories.