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Updated: Jul 5, 2025
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Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
Published on: February 4, 2011
27.5K
Capillarity Enabled Large-Array Liquid Metal Electrodes for Compact and High-Throughput Dielectrophoretic
Huichao Chai1, Junwen Zhu1, Yongxiang Feng1
1State Key Laboratory of Precision Measurement Technology and Instrument, Department of Precision Instrument, Tsinghua University, Beijing, 100084, P. R. China.
Advanced Materials (Deerfield Beach, Fla.)
|January 18, 2024
Summary
This study introduces a novel method for high-density liquid metal alloy (LMA) electrode arrays in microfluidic devices, significantly boosting dielectrophoresis (DEP) particle separation throughput and enabling efficient cell separation.
Area of Science:
- Microfluidics
- Biotechnology
- Materials Science
Background:
- Dielectrophoresis (DEP) particle separation offers label-free, controlled, and low-damage advantages.
- Liquid metal alloy (LMA) sidewall microelectrodes provide strong DEP forces due to their thickness.
- Current LMA devices struggle with integrating large electrode arrays in small spaces, limiting flow rates and throughput.
Purpose of the Study:
- To develop a facile and versatile method for integrating high-density thick LMA electrodes in microfluidic devices.
- To enhance DEP particle separation throughput by utilizing an arrayed electrode configuration.
- To demonstrate the efficacy of the developed platform for complex biological sample separation.
Main Methods:
- Co-designing microfluidic channels with capillary burst valves (CBVs) with specific burst pressures.
- Facilitating self-assembly of LMA electrode arrays via simple hand-push injection.
- Fabricating a compact chip with 5000 pairs of sidewall electrodes for accumulative DEP deflection.
Main Results:
- Achieved a tenfold increase in DEP deflection throughput compared to existing devices.
- Successfully separated mixed biological samples, including human peripheral blood mononuclear cells and A549 cells.
- Demonstrated high-throughput separation at a flow rate of 70 µL/min using the 5000-electrode-pair device.
Conclusions:
- The proposed method enables efficient fabrication of LMA electrode arrays in microfluidic devices.
- The developed platform offers a robust and versatile solution for high-throughput DEP separation applications.
- This advancement can significantly facilitate the integration of LMA electrodes for various DEP-based applications.
