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Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow

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Published on: February 4, 2011

Manipulating particles in microfluidics by floating electrodes.

Sinan E Yalcin¹, Ashutosh Sharma, Shizhi Qian

¹Department of Mechanical and Aerospace Engineering, Old Dominion University, Norfolk, VA, USA.

Electrophoresis

|October 15, 2010

Summary

This summary is machine-generated.

Floating electrodes in microchannels enable precise particle manipulation using electric fields. This method allows for controlled particle concentration, movement, and focusing, offering new possibilities in microfluidic applications.

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Area of Science:

Microfluidics
Electrokinetics
Particle Manipulation

Background:

Dielectric microchannels typically have uniform surface charge.
Metal electrodes in electric fields exhibit induced surface charge and localized flow.

Purpose of the Study:

To demonstrate particle manipulation using floating electrodes in a microchannel.
To investigate the mechanism of induced-charge electroosmotic flow (ICEOF).

Main Methods:

Experimental demonstration of particle manipulation in a straight microchannel.
Utilizing DC electric fields applied across floating electrodes.
Analyzing particle behavior under varying electric field strengths.

Main Results:

Floating electrodes induce localized ICEOF, controllable by electric field strength.
Single electrode enables particle concentration and directed movement (anode/cathode).
Double electrodes achieve particle squeezing and focusing into a central stream.

Conclusions:

Floating electrodes offer a versatile platform for microfluidic particle manipulation.
ICEOF generated by floating electrodes is a key mechanism for particle control.
This technique shows promise for applications in particle separation and focusing.