Biomedical Microdevices

, Volume 11, Issue 1, pp 251–258

Effect of nonuniform surface potential on electroosmotic flow at large applied electric field strength

Article

DOI: 10.1007/s10544-008-9231-2

Cite this article as:
Chen, L. & Conlisk, A.T. Biomed Microdevices (2009) 11: 251. doi:10.1007/s10544-008-9231-2

Abstract

Electroosmotic flow in nanochannels with non-uniform wall potential is investigated. While several researchers have presented results for the case of periodic potential and sudden change in potential, most of the previous work in this area is based on the Debye–Hückel approximation and the validity of Boltzmann distribution for ionic species. In this paper, the nonlinear distributions of potential, velocity and mole fractions are calculated numerically based on the Poisson–Nernst–Planck model including convective effects. The distribution of potential and species concentration are shown to be different from the Boltzmann distribution at large applied electric field strength. The convective effect is also investigated and found to be negligible.

Keywords

Electroosmotic flow (EOF) Electric double layer Heterogeneous surface potential Step change 

Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringThe Ohio State UniversityColumbusUSA

Personalised recommendations