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Issue 9, 2007
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Dielectrophoresis switching with vertical sidewall electrodes for microfluidic flow cytometry

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Abstract

A novel dielectrophoresis switching with vertical electrodes in the sidewall of microchannels for multiplexed switching of objects has been designed, fabricated and tested. With appropriate electrode design, lateral DEP force can be generated so that one can dynamically position particulates along the width of the channel. A set of interdigitated electrodes in the sidewall of the microchannels is used for the generation of non-uniform electrical fields to generate negative DEP forces that repel beads/cells from the sidewalls. A countering DEP force is generated from another set of electrodes patterned on the opposing sidewall. These lateral negative DEP forces can be adjusted by the voltage and frequency applied. By manipulating the coupled DEP forces, the particles flowing through the microchannel can be positioned at different equilibrium points along the width direction and continue to flow into different outlet channels. Experimental results for switching biological cells and polystyrene microbeads to multiple outlets (up to 5) have been achieved. This novel particle switching technique can be integrated with other particle detection components to enable microfluidic flow cytometry systems.

Graphical abstract: Dielectrophoresis switching with vertical sidewall electrodes for microfluidic flow cytometry

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Publication details

The article was received on 11 Apr 2007, accepted on 13 Jun 2007 and first published on 25 Jun 2007


Article type: Paper
DOI: 10.1039/B705386J
Citation: Lab Chip, 2007,7, 1114-1120
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    Dielectrophoresis switching with vertical sidewall electrodes for microfluidic flow cytometry

    L. Wang, L. A. Flanagan, N. L. Jeon, E. Monuki and A. P. Lee, Lab Chip, 2007, 7, 1114
    DOI: 10.1039/B705386J

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