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¹Systems Design Engineering, University of Waterloo, Waterloo, Ontario, Canada.

Biomedical Microdevices

|September 26, 2008

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This study introduces a novel microchip device for precise control of microbead positions using dielectrophoresis (DEP). The device enables manipulation along two planar axes, crucial for microfluidic applications requiring accurate particle positioning.

Area of Science:

Microfluidics
Biotechnology
Electrical Engineering

Background:

Precise manipulation of microparticles is essential in microfluidic systems.
Existing methods for particle manipulation often lack multi-axis control or require complex fabrication.
Dielectrophoresis (DEP) offers a label-free method for manipulating dielectric particles using non-uniform electric fields.

Purpose of the Study:

To develop and demonstrate an original microchip device for precise manipulation of dielectric microbead positions in two planar dimensions (x and y).
To utilize dielectrophoresis (DEP) effects generated by a unique interdigitated electrode array for particle control.
To enable accurate and flexible positioning of microbeads for potential integration into microfluidic systems.

Main Methods:

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Fabrication of a microchip device with two parallel arrays of triangular-shaped, interdigitated electrodes using a single-layer metal process.
Application of dielectrophoresis (DEP) waveforms to generate controllable electric field configurations.
Utilizing traveling wave dielectrophoresis (TWD) for x-position control and DEP for y-position control of microbeads.
Experimental validation of microbead manipulation along both planar axes.

Main Results:

Demonstrated precise manipulation of microbead x-positions parallel to fluid flow using traveling wave dielectrophoresis (TWD).
Achieved control over microbead y-positions perpendicular to fluid flow by activating electrode arrays with DEP waveforms.
Showcased the ability to hold microbeads at specific locations indefinitely or move them to arbitrary positions.
Confirmed the functional transportation of particles along two planar axes with the developed microchip device.

Conclusions:

The developed microchip device effectively manipulates microbead positions in two planar dimensions using DEP and TWD.
The unique "teeth-like" electrode geometry allows for versatile control over electric field configurations.
This technology offers a promising solution for microfluidic systems requiring accurate particle positioning and manipulation.