论文标题
多孔可渗透膜的电渗透特性
Electro-osmotic properties of porous permeable films
论文作者
论文摘要
在平坦固体支撑上的可渗透多孔涂层显着影响其静电和电动性特性。现有的工作集中在简化的案例上，例如弱充电和/或厚实的多孔膜，理论指导有限。在这里，我们考虑了任何给定体积电荷密度的涂层的一般情况，并获得用于静电电势轮廓的分析公式，对任何薄膜厚度和盐浓度有效。它们使我们能够分析固体支撑处的电势和与外电解质的界面处的电势之间的差异，这是确定可渗透涂层功能的关键参数。我们的分析提供了一个框架，用于解释和预测对多孔膜超级特定的特定框架，从增强的离子吸收到对电渗透流的巨大扩增。结果与水凝胶和沸石涂料，多孔碳和离子交换树脂，聚电解质刷等相关。
Permeable porous coatings on a flat solid support significantly impact its electrostatic and electrokinetic properties. Existing work has focused on simplified cases, such as weakly charged and/or thick porous films, with limited theoretical guidance. Here, we consider the general case of coatings of any given volume charge density and obtain analytic formulas for electrostatic potential profiles, valid for any film thickness and salt concentration. They allow us to calculate analytically the difference between potentials at solid support and at interface with an outer electrolyte, that is the key parameter ascertaining the functionality of permeable coatings. Our analysis provides a framework for interpreting and predicting specific for porous films super-properties, from an enhanced ion absorption to a giant amplification of electro-osmotic flows. The results are relevant for hydrogel and zeolite coatings, porous carbon and ion-exchange resins, polyelectrolyte brushes, and more.
