Field-effect control of electro-osmotic flow with synchronized ac-switching of channel and gate potentials

E.J. van der Wouden, D. Liang, D.C. Hermes, D.C. Hermes, Johannes G.E. Gardeniers, Albert van den Berg

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    3 Citations (Scopus)

    Abstract

    Abstract Electroosmotic flow (EOF) in a microchannel can be controlled electronically by use of an electrode embedded in the wall of the channel. By setting a voltage to the electrode, the zeta-potential at the wall can be changed locally. Thus, the electrode acts as a "gate" for liquid flow, in analogy with a gate in a field-effect transistor. This paper describes the control of EOF by the synchronized switching of the gate potential with the channel axial potential. The advantage of this procedure is that potential gas formation by electrolysis at the electrodes that provide the axial electric field is suppressed, while the direction and magnitude of the EOF can be maintained. The results show that the flow velocity is linearly dependent on the applied gate potential and varies with the phase difference between the applied gate and channel potential. An analysis of the time constants involved in the charging of the insulator, and therewith the switching of the zeta potential, is made in order to predict the maximum operating frequency.
    Original languageUndefined
    Title of host publication19th IEEE International Conference on Micro Electro Mechanical Systems
    Place of PublicationPiscataway
    PublisherIEEE Computer Society
    Pages510-513
    Number of pages4
    ISBN (Print)0-7803-9475-5
    DOIs
    Publication statusPublished - 22 Jan 2006
    Event19th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2006 - Istanbul, Turkey
    Duration: 22 Jan 200626 Jan 2006
    Conference number: 19

    Publication series

    NameMEMS 2006 - 19th IEEE International Conference on Micro Electro Mechanical Systems
    PublisherIEEE Computer Society
    Number06CH37725
    ISSN (Print)1084-6999

    Conference

    Conference19th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2006
    Abbreviated titleMEMS
    CountryTurkey
    CityIstanbul
    Period22/01/0626/01/06

    Keywords

    • BIOS-Micro/nanofluidics
    • METIS-237718
    • EWI-8426

    Cite this

    van der Wouden, E. J., Liang, D., Hermes, D. C., Hermes, D. C., Gardeniers, J. G. E., & van den Berg, A. (2006). Field-effect control of electro-osmotic flow with synchronized ac-switching of channel and gate potentials. In 19th IEEE International Conference on Micro Electro Mechanical Systems (pp. 510-513). (MEMS 2006 - 19th IEEE International Conference on Micro Electro Mechanical Systems; No. 06CH37725). Piscataway: IEEE Computer Society. https://doi.org/10.1109/MEMSYS.2006.1627848