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A Fluidic Device with Polymeric Textured Ratchets.

Koray Sekeroglu1, Melik C Demirel1

  • 1Materials Research Institute and Department of Engineering Science and Mechanics, Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Polymer
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Researchers created nano-textured polymeric surfaces to control water droplet movement. These surfaces enable droplet sorting, gating, and merging, advancing digital fluidics and flexible device fabrication.

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Area of Science:

  • Materials Science
  • Fluid Dynamics
  • Surface Science

Background:

  • Nanotextured surfaces in nature control adhesion, wetting, and transport.
  • Surface chemistry, geometry, and morphology are key for tunable textured surfaces.
  • Controlling droplet directionality is crucial for microfluidic applications.

Purpose of the Study:

  • To fabricate nano-textured polymeric surfaces.
  • To investigate the effect of tilting on water droplet mobility on these surfaces.
  • To explore the potential of these surfaces for droplet manipulation.

Main Methods:

  • Fabrication of nano-textured polymeric surfaces.
  • Utilizing asymmetric nano-PPX tracks for droplet transport.
  • Studying the mobility of frequency-modulated water droplets under tilting conditions.
  • Observing droplet behavior on plastically-deformed tracks.

Main Results:

  • Asymmetric nano-PPX tracks guided water droplet transport.
  • Droplet mobility was influenced by surface tilting.
  • Plastically-deformed tracks enabled volume-dependent droplet sorting, gating, and merging.
  • Demonstrated control over droplet directionality and manipulation.

Conclusions:

  • Nano-textured polymeric surfaces offer tunable control over droplet transport.
  • Plastically-deformed polymeric ratchets are effective for microfluidic manipulation.
  • These findings open new possibilities for digital fluidics and flexible device fabrication.