Effects of ionic concentration gradient on electroosmotic flow mixing in a microchannel

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:440

Article

Peng, Ran¹  Li, Dongqing¹ 

[1] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada

关键词: Flow mixing;    Electroosmotic flow;    Ionic concentration;    Zeta potential;    Dielectric constant;   

DOI  :  10.1016/j.jcis.2014.10.061

来源: Elsevier

【 摘 要 】

Effects of ionic concentration gradient on electroosmotic flow (EOF) mixing of one stream of a high concentration electrolyte solution with a stream of a low concentration electrolyte solution in a microchannel are investigated numerically. The concentration field, flow field and electric field are strongly coupled via concentration dependent zeta potential, dielectric constant and electric conductivity. The results show that the electric field and the flow velocity are non-uniform when the concentration dependence of these parameters is taken into consideration. It is also found that when the ionic concentration of the electrolyte solution is higher than 1 M, the electrolyte solution essentially cannot enter the channel due to the extremely low electroosmotic flow mobility. The effects of the concentration dependence of zeta potential, dielectric constant and electric conductivity on electroosmotic flow mixing are studied. (C) 2014 Elsevier Inc. All rights reserved.

【 授权许可】

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