Electroosmosis in a finite cylindrical pore: simple models of end effects
arXiv:1702.00454 · doi:10.1021/la502349g
Abstract
A theoretical model of electroosmosis through a circular pore of radius that traverses a membrane of thickness is investigated. Both the cylindrical surface of the pore and the outer surfaces of the membrane are charged. When end effects are negligible: results of full numerical computations of electroosmosis in an infinite pore agree with theory. When , end effects dominate, and computations again agree with analysis. For intermediate values of , an approximate analysis that combines these two limiting cases captures the main features of computational results when the Debye length is small compared with the pore radius . However, the approximate analysis fails when , when the charge cloud due to the charged cylindrical walls of the pore spills out of the ends of the pore, and the electroosmotic flow is reduced. When this spilling out is included in the analysis, agreement with computation is restored.
32 pages, 6 figures