Electroosmotic Flow Rectification in Membranes with Asymmetrically Shaped Pores: Effects of Current and Pore Density

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• 作者：Gregory W. Bishop ; Marcos M. Lopez ; Jr. ; Pradeep Ramiah Rajasekaran ; Xiaojian Wu ; Charles R. Martin
• 刊名：Journal of Physical Chemistry C
• 出版年：2015
• 出版时间：July 23, 2015
• 年：2015
• 卷：119
• 期：29
• 页码：16633-16638
• 全文大小：359K
• ISSN：1932-7455

文摘

We have recently demonstrated a new electrokinetic phenomenon鈥攅lectroosmotic 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鈥攃urrent density used to drive flow through the membrane and membrane pore density鈥攐n 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.