Electroosmosis in homogeneously charged micro- and nanoscale random porous media
Electroosmosis in homogeneously charged micro- and nanoscale random porous media
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DOI：
10.1016/j.jcis.2007.05.043
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发表时间：
2007-10-01
影响因子：
9.9
通讯作者：
Chen, Shiyi
中科院分区：
文献类型：
--
作者：
Wang, Moran;Chen, Shiyi
采用介观模拟方法对均匀带电微纳米尺度随机多孔介质中的电渗透进行了数值研究，其中包括用于再现多孔介质三维随机微观结构的随机生成-生长方法和用于求解三维多孔介质中电渗透强非线性控制方程的高效晶格泊松-玻尔兹曼算法。微纳米尺度随机多孔介质中电渗透性的数值模拟与预测表明，电渗透性随多孔介质孔隙度的增大而单调增大，且增大速率随孔隙度的增大而增大；电渗透性随孔隙率的增大而增大，随体积离子浓度的增大而增大；在高zeta电位的固体表面上，电渗透性与zeta电位之间的比例线性关系被打破。目前的预测与现有的实验数据吻合较好，但有些结果与基于宏观理论的预测存在偏差。(C) 2007爱思唯尔公司版权所有。
Electroosmosis in homogeneously charged micro- and nanoscale random porous media has been numerically investigated using mesoscopic simulation methods which involve a random generation-growth method for reproducing three-dimensional random microstructures of porous media and a high-efficiency lattice Poisson-Boltzmann algorithm for solving the strongly nonlinear governing equations of electroosmosis in three-dimensional porous media. The numerical modeling and predictions of EOF in micro- and nanoscale random porous media indicate that the electroosmotic permeability increases monotonically with the porosity of porous media and the increasing rate rises with the porosity as well; the electroosmotic permeability increases with the average solid particle size for a given porosity and with the bulk ionic concentration also; the proportionally linear relationship between the electroosmotic permeability and the zeta potential on solid surfaces breaks down for high zeta potentials. The present predictions agree well with the available experimental data while some results deviate from the predictions based on the macroscopic theories. (C) 2007 Elsevier Inc. All rights reserved.