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Manipulating Pico- to Nanoliter Droplets on Surfaces without Sticking.

Mizuki Tenjimbayashi1, Shunto Arai2, Hiroshi Mizoguchi1

  • 1Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan.

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Summary

This study presents a novel surface coating using nano-micrometer particles to prevent picoliter droplets from sticking. This breakthrough enables precise manipulation of tiny liquid volumes for advanced microfluidic applications.

Keywords:
droplet manipulationliquid marblenanomicrometer hierarchical particlesnonsticking picoliter dropletsuperomniphobicity

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Area of Science:

  • Surface Science
  • Microfluidics
  • Materials Science

Background:

  • Droplet manipulation is crucial in industries, requiring liquid-repellent surfaces.
  • Existing surfaces struggle with precise control of pico- to nanoliter droplets due to sticking.
  • Overcoming adhesion is key for advancing microscale liquid handling.

Purpose of the Study:

  • To demonstrate nonsticking properties for pico- to nanoliter droplets on a novel surface.
  • To enable precise manipulation and control of ultralow-volume droplets.
  • To advance the understanding of droplet behavior at interfaces for microfluidic systems.

Main Methods:

  • Coating surfaces with low-surface-energy particles in the nano-micrometer range.
  • Utilizing dynamic particle coating via ultrasonic spraying for droplet encapsulation.
  • Investigating the change in interfacial friction from solid-liquid to solid-solid.

Main Results:

  • Formation of spherical, isolated, particle-coated picoliter droplets.
  • Reduction of droplet movement force to the subnanonewton range.
  • Demonstration of nonsticking sliding of picoliter droplets on tilted substrates.

Conclusions:

  • The particle coating effectively prevents sticking of pico- to nanoliter droplets.
  • The method allows complex manipulation including separation, arrangement, and shape reconfiguration.
  • This approach offers potential for downsizing fluidic devices and systems.