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Picoinjection of Microfluidic Drops Without Metal Electrodes
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Electrostatic potential wells for on-demand drop manipulation in microchannels.

Riëlle de Ruiter1, Arjen M Pit, Vitor Martins de Oliveira

  • 1Physics of Complex Fluids and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands. r.deruiter-1@utwente.nl.

Lab on a Chip
|January 8, 2014
PubMed
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This study introduces a hybrid microfluidic system for precise droplet control. It combines channel-based flow with electrowetting, enabling on-demand droplet manipulation for lab-on-a-chip applications.

Area of Science:

  • Microfluidics
  • Electrowetting
  • Lab-on-a-chip technology

Background:

  • Precise control of individual droplets is essential for microfluidic devices.
  • Existing methods often face limitations in throughput or individual droplet manipulation.
  • Lab-on-a-chip applications require advanced fluid handling capabilities.

Purpose of the Study:

  • To present a novel hybrid microfluidic concept integrating channel-based discrete microfluidics with electrowetting.
  • To demonstrate versatile droplet manipulation capabilities including trapping, release, guiding, and sorting.
  • To develop a predictive model for droplet trapping conditions.

Main Methods:

  • Incorporation of co-planar electrodes within microchannel walls.
  • Utilizing electrowetting for electrical actuation of droplets.

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  • Combining channel-based flow with electrostatic forces for droplet manipulation.
  • Developing a force-balance model to predict trapping conditions.

    • Main Results:

    • Successful integration of electrowetting functionality into channel-based microfluidics.
    • Demonstration of on-demand droplet trapping, release, guiding, and sorting.
    • Identification of the interplay between electrostatic and hydrodynamic forces in droplet manipulation.
    • Validation of a simple model for predicting droplet trapping.

    Conclusions:

    • The hybrid system effectively combines high throughput with precise individual droplet control.
    • Electrowetting provides tunable electrostatic forces for diverse microfluidic manipulations.
    • The developed model aids in predicting and optimizing droplet trapping in microchannels.