The electric field strength in orifice-like nanopores of ultrathin membranes
The electric field strength in orifice-like nanopores of ultrathin membranes
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DOI：
10.1088/0957-4484/26/4/045704
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发表时间：
2015-01
期刊：
影响因子：
3.5
通讯作者：
J. Getpreecharsawas;J. McGrath;D. Borkholder
中科院分区：
文献类型：
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作者：
J. Getpreecharsawas;J. McGrath;D. Borkholder
在这里，我们表明，电场内的一个电渗透膜是弱于传统的理论将预测，并减少字段是预测测得的电渗透流速。我们的理论分析表明，带电纳米孔内的电场受到端部效应的影响，并取决于杜欣数Du，当孔的长度与直径的纵横比λ小于80时，对于杜欣数1或300时，对于杜欣数1。电场遵循非常规的标度律;它不再与膜的厚度均匀地成比例，而是与每个纳米孔的λ的局部值成比例。
Here we show that the electric field inside an ultrathin membrane is weaker than conventional theory would predict, and that the reduced field is predictive of measured electroosmotic flow rates. Our theoretical analysis shows that the electric field inside a charged nanopore is affected by end effects and dependent on the Dukhin number Du when the pore length-to-diameter aspect ratio λ is less than 80 for Du ≪ 1 or 300 for Du ≫ 1. The electric field follows an unconventional scaling law; it no longer scales uniformly with the thickness of membrane, but with the local value of λ for each nanopore.