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Pumping liquids using asymmetric electrode arrays

Ajdari1

  • 1Laboratoire de Physico-Chimie Theorique, Esa CNRS 7083, ESPCI, 10 rue Vauquelin, F-75231 Paris Cedex 05, France.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|October 25, 2000
PubMed
Summary

Researchers propose using asymmetric electric fields to pump liquids in microfluidic channels and drive droplets on surfaces. This method avoids global gradients and utilizes periodic electrode arrays for efficient microfluidic pumping.

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Area of Science:

  • Physics, Applied Physics
  • Engineering, Electrical Engineering

Background:

  • Microfluidic devices and micro-electro-mechanical systems (MEMS) often require precise fluid manipulation.
  • Traditional pumping methods may rely on global gradients, limiting design flexibility.

Purpose of the Study:

  • To introduce a novel strategy for pumping liquids and driving droplets using locally asymmetric electric geometries.
  • To demonstrate a method that eliminates the need for global gradients in the pumping direction.

Main Methods:

  • A general symmetry argument is employed to derive the pumping principle.
  • A practical realization involves using polar periodic arrays of electrodes.
  • An AC (alternating current) voltage difference is applied across the electrodes.

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Main Results:

  • The proposed strategy enables liquid pumping in channels and droplet manipulation on surfaces.
  • The method is effective without requiring a global gradient along the pumping direction.
  • A simple electro-osmotic model was used to estimate achievable pumping velocities.

Conclusions:

  • Locally asymmetric electric geometries offer a promising approach for microfluidic applications.
  • This technique provides a versatile and gradient-free method for fluid and droplet control in micro-devices.
  • The findings are relevant for the advancement of microfluidic devices and MEMS.