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A versatile technology for droplet-based microfluidics: thermomechanical actuation.

Vincent Miralles1, Axel Huerre, Hannah Williams

  • 1MMN, UMR CNRS Gulliver 7083, PSL Research University, ESPCI ParisTech, 10 rue Vauquelin, Paris 75005, France. marie-caroline.jullien@espci.fr.

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|April 8, 2015
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Summary

This study introduces a novel thermomechanical technique for precise microfluidic droplet control. The method enables efficient droplet generation, manipulation, and sorting using localized heating elements in microfluidic chips.

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Area of Science:

  • Microfluidics
  • Soft Matter Physics
  • Engineering

Background:

  • Microfluidic droplet manipulation is crucial for various applications.
  • Existing methods often face limitations in versatility and efficiency.
  • Precise control over droplet behavior is a persistent challenge.

Purpose of the Study:

  • To present a versatile thermomechanical technique for microfluidic droplet manipulation.
  • To demonstrate the effectiveness of the technique from droplet generation to complex operations.
  • To offer a low-power, accessible method for droplet control.

Main Methods:

  • Utilizing non-wetting droplets within a microfluidic chip.
  • Employing localized heating resistors for thermomechanical actuation.
  • Controlling temperature variations to induce localized PDMS wall dilation and droplet propulsion.

Main Results:

  • Successful demonstration of droplet generation, propulsion, stopping, storing, releasing, sorting, rearrangement, and break-up.
  • Achieved precise droplet control through adapted placement and actuation of heating resistors.
  • Demonstrated low electric power consumption (<150 mW) for the manipulation process.

Conclusions:

  • The developed thermomechanical actuation technique offers a versatile solution for microfluidic droplet manipulation.
  • This method is effective across all stages, including generation, propulsion, and sorting.
  • The technique is technically accessible and provides a valuable tool for droplet microfluidics.