Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA.
J Am Chem Soc. 2010 Feb 24;132(7):2118-9. doi: 10.1021/ja909335r.
We demonstrate here a new electrokinetic phenomenon, Electroosmotic flow (EOF) rectification, in synthetic membranes containing asymmetric pores. Mica membranes with pyramidally shaped pores prepared by the track-etch method were used. EOF was driven through these membranes by using an electrode in solutions on either side to pass a constant ionic current through the pores. The velocity of EOF depends on the polarity of the current. A high EOF velocity is obtained when the polarity is such that EOF is driven from the larger base opening to the smaller tip opening of the pore. A smaller EOF velocity is obtained when the polarity is reversed such that EOF goes from tip to base. We show that this rectified EOF phenomenon is the result of ion current-rectification observed in such asymmetric-pore membranes.
我们在这里展示了一种新的电动力学现象，即含有不对称孔的合成膜中的电渗流（EOF）整流。使用了通过轨迹蚀刻方法制备的具有金字塔形孔的云母膜。通过在两侧溶液中的电极驱动这些膜中的 EOF，使离子电流通过孔恒定。EOF 的速度取决于电流的极性。当极性使得 EOF 从较大的基底开口驱动到孔的较小尖端开口时，EOF 速度较高。当极性反转使得 EOF 从尖端流向基底时，EOF 速度较小。我们表明，这种整流 EOF 现象是在这种不对称孔膜中观察到的离子电流整流的结果。
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