Trapping Of Submicron And Micron-sized
Particles Using Innovative Induced-charge
Electrokinetic Flow
Author(s)
C. Zhao & C. Yang
Abstract
Microfluidic manipulation of particulate matters has found its applications in cell
handling, virus detection, biomolecule concentration and colloidal particle
assembly etc. In the literature, optical tweezing, electrophoresis, and
dielectrophoresis are well-established techniques for particle manipulations, but
these techniques have their respective limitations such as low throughput and
high costs for optical tweezing, charged particles required for electrophoresis,
complex electrode design for dielectrophoresis. Induced charge electrokinetic
(ICEK) flows belong to a new class of flows. One of the basic features for ICEK
is the generation of vortices over polarisable surfaces. In literature, these kind of
nonlinear vortical flows naturally lend themselves to the mixing enhancement in
microfluidic devices. Other than the microfluidic mixing, the applications of
induced-charge electrokinetics in microfluidics are very rare. Here a novel and
high-throughput technique relying on the induced-charge electrokinetics is
proposed and demonstrated for simultaneous trapping and concentration of
submicron- to micron-sized particles. The fabricated microfluidic device is
simply composed of a straight channel and a gold patch on the bottom wall of
channel. Under DC-biased AC electric driving voltages, the trapping of particles
over the edge of the conducting gold patch are achieved. Moreover, systematic
studies are conducted to investigate the effects AC frequency, AC amplitude, DC
offset and particle size on the performance of trapping and concentration by
ICEK. In addition, a numerical model is developed to explain the underlying
mechanisms of particle trapping via ICEK.
Keywords: induced-charge electrokinetic flow, induced charge electrokinetics,
microfluidics, colloidal particle trapping and concentration.
Keywords
induced-charge electrokinetic flow, induced charge electrokinetics,
microfluidics, colloidal particle trapping and concentration.
Related Book
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