Continuous flow microfluidic demixing of electrolytes by induced charge electrokinetics in structured electrode arrays

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    Abstract

    A continuous flow microfluidic demixing process is realized. It utilizes high external electrical fields that are applied over electrically floating noble metal electrodes in an otherwise straight microchannel. The process converts axial electrical potential gradients into lateral molecular selective transport via a structure oriented ensemble of numerous electrodes. While the individual electrodes locally modify the electrolyte distribution by nonlinear electrokinetic effects and concentration polarization, the directed orientation of the electrode array combines the individual polarization zones to a dedicated molecular enrichment against the generated concentration gradient. A homogeneously concentrated electrolyte can be separated into arbitrarily shaped laminae of increased and depleted concentration by the presented microfluidic demixer.
    Original languageUndefined
    Article number10.1021/ac051615n
    Pages (from-to)1425-1434
    Number of pages10
    JournalAnalytical chemistry
    Volume78
    Issue number5
    DOIs
    Publication statusPublished - 1 Mar 2006

    Keywords

    • EWI-8360
    • IR-63735
    • METIS-231960
    • BIOS-Micro/nanofluidics

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