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Issue 2, 2009
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Rapid and selective concentration of microparticles in an optoelectrofluidic platform

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Abstract

We demonstrate rapid manipulation and selective concentration of microparticles using AC electrokinetics such as dielectrophoresis (DEP) and AC electro-osmosis (ACEO) in an optoelectrofluidic platform based on a liquid crystal display (LCD). When 10 V bias at 10 kHz was applied to the optoelectrofluidic device, only the 1 µm-diameter polystyrene particles were concentrated into the projected LCD image patterns and closely packed, forming the crystalline structure by ACEO flow, while the 6 µm-diameter particles were repelled by negative DEP forces. We have characterized this frequency-dependency of the optoelectrofluidic particle behavior according to the particle diameter. On the basis of these results, we can rapidly concentrate the 1 µm-diameter particles and separate them from the 6 µm particles, by applying an AC signal of 10 kHz frequency. This novel technique can be applied to rapidly concentrate, separate and pattern micro-/nanoparticles in many biological and chemical applications.

Graphical abstract: Rapid and selective concentration of microparticles in an optoelectrofluidic platform

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Article information


Submitted
09 Jul 2008
Accepted
17 Oct 2008
First published
17 Nov 2008

Lab Chip, 2009,9, 199-206
Article type
Paper

Rapid and selective concentration of microparticles in an optoelectrofluidic platform

H. Hwang and J. Park, Lab Chip, 2009, 9, 199
DOI: 10.1039/B811740C

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