MEMSuniverse » tornado http://www.memsuniverse.com A Passion for Creativity & Innovation Tue, 23 Oct 2012 21:57:22 +0000 en-US hourly 1 http://wordpress.org/?v=3.4.2 Electrohydrodynamically-driven blood plasma separation http://www.memsuniverse.com/microfluidics/electrohydrodynamically-driven-blood-plasma-separation.html http://www.memsuniverse.com/microfluidics/electrohydrodynamically-driven-blood-plasma-separation.html#comments Tue, 27 Feb 2007 20:27:59 +0000 admin http://www.memsuniverse.com/?p=58 Ionic or corona wind generated by applying a voltage to a sharp needle tip is used to shear the surface of a liquid housed in a tiny microfluidic chamber about 8 mm in diameter and 4 mm deep. These surface vortices induce a secondary spiral or tornado-like flow. Particles suspended in the fluid, in this case, red blood cells in blood plasma, spiral downwards to a bottom stagnation point in much the same way that tea leaves in a stirred tea cup ac ulate in the center at the base of the cup. This is exploited to perform microfluidic blood plasma separation in under 300 seconds without sample contact or mechanically moving parts. The technology is therefore useful for the development of miniaturised medical diagnostic kits. References: Yeo et al., Appl. Phys. Lett. 89, 103516, 2006; Arifin et al., Biomicrofluidics 1, 014103, 2007. Press releases: ‘Stirring things apart’, The Economist, 20 Jan. 2007.

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