DC-Biased AC-Electrokinetic Mixing: A Mechanistic Investigation

Wee Yang Ng; Yee Cheong Lam; Isabel Rodríguez

doi:10.4028/www.scientific.net/AMR.74.109

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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 74DC-Biased AC-Electrokinetic Mixing: A Mechanistic...

DC-Biased AC-Electrokinetic Mixing: A Mechanistic Investigation

Abstract:

This paper presents an experimental investigation on the DC-biased AC-electrokinetic (ACEK) flow vortex in a rectangular microchannel. This is a new flow phenomenon in AC-electrokinetics and had been successfully utilized for microfluidic mixing as reported in our previous work. The microchannel is aligned parallel to a pair of energized coplanar microelectrodes such that the generated flow vortex is perpendicular to the pressure-driven flowing samples. With the application of a DC bias AC voltage, incipient Faradaic reactions occur above the electrodes and thus producing ions and creating a net dominant flow vortex. Further investigation to understand the generation of the DC-biased ACEK flow was conducted. This is performed by direct visualization of such flow vortex formation from the cross-section of a rectangular microchannel.