A high current density DC magnetohydrodynamic (MHD) micropump

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Homsy, Alexandra and Koster, Sander and Eijkel, Jan C.T. and Berg, Albert van den and Lucklum, F. and Verpoorte, E. and Rooij, Nico F. de (2005) A high current density DC magnetohydrodynamic (MHD) micropump. Lab on a Chip, 5 (4). pp. 466-471. ISSN 1473-0197

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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.
Item Type:Article
Additional information:This work was supported by an EPFL Presidential Fund (Nr. 581.552) and by the Swiss National Science Foundation (Project Nr. 2100-61549.00).
Copyright:© 2005 Royal Society of Chemistry
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/51073
Official URL:http://dx.doi.org/10.1039/b417892k
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