In a similar fashion to Einstein’s tea leaf paradox, the rotational liquid flow induced by ionic wind above a liquid surface can trap suspended microparticles by a helical motion, spinning them down towards a bottom stagnation point. The motion is similar to Batchelor [Q. J. Mech. Appl. Math. 4, 29 (1951)] flows occurring between stationary and rotating disks and arises due to a combination of the primary azimuthal and secondary bulk meridional recirculation that produces a centrifugal and enhanced inward radial force near the chamber bottom. The technology is thus useful for microfluidic particle trapping/concentration; the authors demonstrate its potential for rapid erythrocyte/blood plasma separation for miniaturized medical diagnostic kits.
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Research Article| September 07 2006
Electric tempest in a teacup: The tea leaf analogy to microfluidic blood plasma separation
Leslie Y. Yeo;
James R. Friend;
Leslie Y. Yeo, James R. Friend, Dian R. Arifin; Electric tempest in a teacup: The tea leaf analogy to microfluidic blood plasma separation. Appl. Phys. Lett. 4 September 2006; 89 (10): 103516. https://doi.org/10.1063/1.2345590
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