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Jonathan D Wehking1, Ranganathan Kumar

  • 1University of Central Florida, Orlando, Florida 32816, USA. Ranganathan.Kumar@ucf.edu.

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Electrical fields can control liquid droplet behavior in microchannels, enabling size-based droplet sorting. This research details a method for passive droplet binning using microfluidic devices and electrical potential gradients.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Electrokinetics

Background:

  • Controlling liquid droplets in microfluidic systems is crucial for various applications.
  • Existing methods for droplet manipulation often require complex setups or active control.

Purpose of the Study:

  • To demonstrate the use of electrical potential for deforming, decelerating, and pinning liquid droplets in microchannels.
  • To develop a method for passively sorting droplets by size on demand using a branched microfluidic device.

Main Methods:

  • Utilizing electrical potential gradients to manipulate droplet behavior.
  • Conducting three-dimensional numerical simulations to model droplet deformation, deceleration, squeezing, and release.
  • Experimentally verifying simulation results using polydimethylsiloxane (PDMS) microfluidic devices.

Main Results:

  • Liquid droplets can be effectively deformed, decelerated, and pinned by applying electrical potentials.
  • Passive, size-based droplet binning is achieved by concentrating potential gradients at microchannel corners.
  • Experimental results qualitatively validate the findings from numerical simulations.

Conclusions:

  • Electrical manipulation offers a precise and on-demand method for controlling liquid droplets in microfluidics.
  • The developed technique allows for passive, size-selective droplet sorting in branched microfluidic devices.
  • Understanding the interplay between hydrodynamic and electric forces is key to optimizing droplet pinning and binning.