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Electrokinetic flow in micro- and nano-fluidic components

Zheng, Zhi
http://rave.ohiolink.edu/etdc/view?acc_num=osu1068243983

Abstract Details

2003, Doctor of Philosophy, Ohio State University, Biomedical Engineering.
In this work, electrokinetic flow through nano- and micro-channels is investigated. The governing equations for the flow in three dimensional channels are derived from Poisson-Nernst-Planck theory. The boundary conditions for the governing equations are obtained from the electrochemical equilibrium requirements. The results are compared with three sets of experimental data, provided by iMEDD inc., Oak Ridge National Laboratory, and Georgia Institute of Technology. The results of comparison are extremely good. A finite difference method is used to solve the governing equations numerically. For asymptotic cases, the governing equations are solved analytically using singular perturbation method. The results show that multivalent counterions decrease the electroosmotic flow extraordinarily. Scaling laws for the governing equations are introduced which clarify that several dimensionless parameters determine the potential and velocity profiles and the distribution patterns of ion species. The relationship between the channel surface charge density and the zeta potential is explored. The diffusive fluxes, electric migrational fluxes and convective fluxes of different ion species in the electrokinetic flow are obtained from the governing equations. Results are also obtained for electroosmosis in 2D nanochannels. At the end of this work, the governing equations for unsteady flow are derived, the transport of macromolecules through micro- and nano- channels is discussed and the future work in these areas is suggested.
A Conlisk (Advisor)
269 p.
Engineering, Biomedical
Electroosmotic; Electrokinetic; Model; Channel-Reservoir; Electrochemical equilibrium; multivalent; monovalent; EDL; surface charge density; experimental comparison; flux; 2D nanochannels; unsteady flow

Recommended Citations

Citations

  • Zheng, Z. (2003). Electrokinetic flow in micro- and nano-fluidic components [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1068243983

    APA Style (7th edition)

  • Zheng, Zhi. Electrokinetic flow in micro- and nano-fluidic components. 2003. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1068243983.

    MLA Style (8th edition)

  • Zheng, Zhi. "Electrokinetic flow in micro- and nano-fluidic components." Doctoral dissertation, Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc_num=osu1068243983

    Chicago Manual of Style (17th edition)

osu1068243983
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© 2003, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.