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A liquid metal based, integrated parallel electroosmotic micropump cluster drive system.

Qian Li1,2, Pan Zhang1,3, Zi Ye1

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This study introduces a novel liquid metal electroosmotic micropump (EOP) cluster for microfluidic systems. The integrated parallel design achieves a high flow rate of 274 nL/min at 5V, driven by low voltage.

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Area of Science:

  • Microfluidics
  • Electrokinetics
  • Materials Science

Background:

  • Microfluidic systems require efficient and integrated pumping solutions.
  • Electroosmotic pumps (EOPs) offer precise fluid control but face challenges in scalability and long-term stability.

Purpose of the Study:

  • To propose and demonstrate a low-voltage driveable integrated parallel electroosmotic micropump (EOP) cluster.
  • To enhance pumping capacity and address limitations of traditional EOPs for microfluidic applications.

Main Methods:

  • Fabrication of a two-layer microfluidic system with parallel pumping channels and liquid metal electrodes.
  • Parametric studies to optimize the design of the EOP cluster.
  • Experimental validation of low-voltage drive and flow rate performance.

Main Results:

  • The integrated parallel EOP cluster can be driven at a low voltage of 0.5 V.
  • A maximum flow rate of 274 nL/min was achieved at 5 V.
  • An electrode protection strategy and integrated pump-valve system were proposed.

Conclusions:

  • The proposed liquid metal EOP cluster significantly increases pumping capacity for microfluidic applications.
  • The system demonstrates efficient low-voltage operation and offers solutions for EOP storage and driving limitations.