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Particle Timing Control and Alignment in Microchannel Flow by Applying Periodic Force Control Using Dielectrophoretic

Kazuya Tatsumi1, Koki Kawano1, Hiromichi Shintani1

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This study introduces a microfluidic technique to precisely control particle timing and velocity in microchannels. The method uses dielectrophoretic forces to achieve controlled particle spacing and synchronized flow.

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Area of Science:

  • Microfluidics
  • Biophysics
  • Particle Manipulation

Background:

  • Precise control over particle behavior in microfluidic devices is crucial for various applications.
  • Existing methods often lack the ability to simultaneously control particle timing, spacing, and velocity.

Purpose of the Study:

  • To develop and demonstrate a novel technique for controlling particle streamwise timing, spacing, and velocity in microchannel flow.
  • To investigate the underlying mechanisms and evaluate the performance of this particle alignment technique.

Main Methods:

  • Utilized dielectrophoretic forces generated by ladder-type electrodes in a microfluidic device.
  • Applied periodic acceleration and deceleration forces in the streamwise direction to control particle motion.
  • Adjusted the phase of the applied voltage signal to control particle timing.
  • Experimentally measured particle timing and velocity for Jurkat cells and various particle sizes.

Main Results:

  • Demonstrated successful control of particle spacing and velocity, achieving uniform flow.
  • Showcased synchronization of particle passage timing with the applied force cycles.
  • Evaluated probability density functions for deviations from equilibrium states.

Conclusions:

  • The developed technique effectively aligns randomly distributed particles into a controlled flow with specific spacing and velocity.
  • Particle timing can be precisely synchronized with external electrical signals, offering new possibilities for microfluidic applications.