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A one-step molded microfluidic chip featuring a two-layer silver-PDMS microelectrode for dielectrophoretic cell

Zhongle Zhang1, Yuan Luo, Xiaofeng Nie

  • 1College of Information Science and Technology, Beijing University of Chemical Technology, No. 15 North 3rd Ring Rd., Beijing, 100029, China. xxing@mail.buct.edu.cn.

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Summary

This study presents a novel, low-cost microfluidic device for label-free cell separation using dielectrophoresis (DEP). The integrated 3D electrode and fluidic structure achieves high capture efficiency and purity for cell separation, suitable for clinical applications.

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Area of Science:

  • Microfluidics
  • Biotechnology
  • Cell Separation

Background:

  • Dielectrophoresis (DEP) is a label-free cell separation technique.
  • Existing DEP devices often require complex fabrication and multiple materials.
  • There is a demand for easily-fabricated, low-cost DEP separators for clinical use.

Purpose of the Study:

  • To develop a novel microfluidic DEP separator with an integrated 3D electrode and fluidic structure.
  • To simplify the fabrication process for DEP devices.
  • To improve cell capture efficiency and purity in DEP-based separation.

Main Methods:

  • Fabrication of a microfluidic DEP separator using silver-PDMS composites.
  • Development of a simplified one-step molding process with an SU8 master.
  • Design of a two-layer electrode for vertical cell migration and trapping.
  • Optimization of upper layer thickness and device widening through digit elongation.

Main Results:

  • Achieved a high capture efficiency of 95.4% for live cells.
  • Demonstrated 85.6% purity in separating live/dead HeLa cells.
  • Validated device feasibility in a post-anti-cancer drug viability assay.
  • Simplified fabrication process reduces cost and turnaround time.

Conclusions:

  • The novel integrated DEP separator offers a simplified, low-cost fabrication method.
  • The device design enables efficient and pure cell separation.
  • The technology shows potential for clinical applications and cell-based assays.