A high current density DC magnetohydrodynamic (MHD) micropump

Alexandra Homsy, Sander Koster, S. Hogen-Koster, Jan C.T. Eijkel, Albert van den Berg, F. Lucklum, E. Verpoorte, Nico F. de Rooij

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    Abstract

    This paper describes the working principle of a DC magnetohydrodynamic (MHD) micropump that can be operated at high DC current densities (J) in 75-µm-deep microfluidic channels without introducing gas bubbles into the pumping channel. The main design feature for current generation is a micromachined frit-like structure that connects the pumping channel to side reservoirs, where platinum electrodes are located. Current densities up to 4000 A m−2 could be obtained without noticeable Joule heating in the system. The pump performance was studied as a function of current density and magnetic field intensity, as well as buffer ionic strength and pH. Bead velocities of up to 1 mm s−1 (0.5 µL min−1) were observed in buffered solutions using a 0.4 T NdFeB permanent magnet, at an applied current density of 4000 A m−2. This pump is intended for transport of electrolyte solutions having a relatively high ionic strength (0.5–1 M) in a DC magnetic field environment. The application of this pump for the study of biological samples in a miniaturized total analysis system (µTAS) with integrated NMR detection is foreseen. In the 7 T NMR environment, a minimum 16-fold increase in volumetric flow rate for a given applied current density is expected.
    Original languageUndefined
    Pages (from-to)466-471
    Number of pages6
    JournalLab on a chip
    Volume5
    Issue number4
    DOIs
    Publication statusPublished - 2005

    Keywords

    • EWI-18363
    • IR-51073
    • METIS-224036

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