Electrokinetic Instability near Charge-Selective Hydrophobic Surfaces
Fluid Dynamics
2015-06-18 v1
Abstract
The influence of the texture of a hydrophobic surface on the electro-osmotic slip of the second kind and the electrokinetic instability near charge-selective surfaces (permselective membranes, electrodes, or systems of micro- and nanochannels) is investigated theoretically using a simple model based on the Rubinstein-Zaltzman approach. A simple formula is derived to evaluate the decrease in the instability threshold due to hydrophobicity. The study is complemented by numerical investigations both of linear and nonlinear instabilities near a hydrophobic membrane surface. Theory predicts a significant enhancement of the ion flux to the surface and shows a good qualitative agreement with the available experimental data.
Cite
@article{arxiv.1402.3494,
title = {Electrokinetic Instability near Charge-Selective Hydrophobic Surfaces},
author = {V. S. Shelistov and E. A. Demekhin and G. S. Ganchenko},
journal= {arXiv preprint arXiv:1402.3494},
year = {2015}
}