An effective mechanism for rapid and efficient microfluidic particle trapping and concentration is proposed without requiring any mechanically moving parts. When a voltage beyond the threshold atmospheric ionization value is applied on a sharp electrode tip mounted at an angle above a microfluidic liquid chamber, the bulk electrohydrodynamic air thrust that is generated results in interfacial shear and, hence, primary azimuthal liquid surface recirculation. This discharge driven vortex mechanism, in turn, causes a secondary bulk meridional liquid recirculation, which produces an inward radial force near the bottom of the chamber. Particles suspended in the liquid are then rapidly convected by the bulk recirculation toward the bottom, where the inward radial force causes them to spiral in a helical swirl-like fashion toward a stagnation point. In particular, we show that these flows, similar to Batchelor flows occurring in a cylindrical liquid column between a stationary and rotating disk, can be used for the separation of red blood cells from blood plasma in a miniaturized device.
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March 2007
Research Article|
December 20 2006
Microfluidic blood plasma separation via bulk electrohydrodynamic flows
Dian R. Arifin;
Dian R. Arifin
Micro/Nanophysics Research Laboratory, Department of Mechanical Engineering,
Monash University
, Clayton, VIC 3800, Australia
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Leslie Y. Yeo;
Leslie Y. Yeo
a)
Micro/Nanophysics Research Laboratory, Department of Mechanical Engineering,
Monash University
, Clayton, VIC 3800, Australia
Search for other works by this author on:
James R. Friend
James R. Friend
Micro/Nanophysics Research Laboratory, Department of Mechanical Engineering,
Monash University
, Clayton, VIC 3800, Australia
Search for other works by this author on:
Dian R. Arifin
Leslie Y. Yeo
a)
James R. Friend
Micro/Nanophysics Research Laboratory, Department of Mechanical Engineering,
Monash University
, Clayton, VIC 3800, Australiaa)
Author to whom correspondence should be addressed. Tel: +61 3 9905 3834; Fax: +61 3 9905 4943; Electronic mail: [email protected]
Biomicrofluidics 1, 014103 (2007)
Article history
Received:
October 09 2006
Accepted:
November 21 2006
Citation
Dian R. Arifin, Leslie Y. Yeo, James R. Friend; Microfluidic blood plasma separation via bulk electrohydrodynamic flows. Biomicrofluidics 1 March 2007; 1 (1): 014103. https://doi.org/10.1063/1.2409629
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