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Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
Published on: February 4, 2011
Dielectrophoretic manipulation and separation of microparticles using curved microelectrodes
Khashayar Khoshmanesh1, Chen Zhang, Francisco J Tovar-Lopez
1Centre for Intelligent Systems Research, Deakin University, Victoria, Australia. kkho@deakin.edu.au
Electrophoresis
|October 8, 2009
Summary
This study developed a dielectrophoresis (DEP) system for microparticle separation. The novel curved electrode design effectively sorts particles by size and dielectric properties using electric fields.
Area of Science:
- Microfluidics
- Biophysics
- Electrical Engineering
Background:
- Microparticle manipulation is crucial for various applications.
- Existing methods face challenges in precise separation.
- Dielectrophoresis offers a label-free approach for particle manipulation.
Purpose of the Study:
- To develop and analyze a novel dielectrophoresis (DEP) system for microparticle manipulation and separation.
- To investigate the use of curved microelectrodes for enhanced DEP field generation.
- To assess the system's performance in sorting microparticles based on size and dielectric properties.
Main Methods:
- Fabrication of a microfluidic chip with integrated arrays of novel curved microelectrodes.
- Utilizing computational fluid dynamics (CFD) to characterize the electric field and particle dynamics.
- Experimental analysis using microspheres of varying diameters (1, 5, and 12 microm).
- Application of high-frequency AC potential to induce dielectrophoretic forces.
Main Results:
- A spatially varying electric field was induced, generating dielectrophoretic (DEP) forces.
- Negative-DEP behavior was observed, repelling particles from electrodes.
- Particles of different dimensions experienced distinct DEP forces, leading to separation.
- Successful sorting of microparticles based on size and dielectric properties was demonstrated.
Conclusions:
- The developed DEP system with curved microelectrodes is effective for microparticle separation.
- The system acts as a field flow fractionation tool, sorting particles by size and dielectric properties.
- This technology holds potential for applications in cell sorting and analysis.
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