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Erasable and Programmable Unidirectional Liquid Transport on Multiple Asymmetric Slippery Microstructures.

Zhe Li1,2, Min Xu2, Muqian Li2

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Researchers developed 3D-printed asymmetric microstructures with a slippery coating for precise, pumpless liquid control. This innovation enables new functionalities like erasable channels and programmable flow for advanced fluidic devices.

Keywords:
asymmetric structurebioinspired interfaceliquid transportslippery surfaceunidirectional

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Area of Science:

  • Materials Science
  • Microfluidics
  • Surface Engineering

Background:

  • Unidirectional fluid delivery using asymmetric microstructures offers advantages like being pumpless and easily integrated.
  • Challenges remain in designing continuous flow and on-surface recyclable manipulation for such systems.

Purpose of the Study:

  • To present a novel system of 3D-printed asymmetric microstructures with a sprayable slippery coating for advanced liquid control.
  • To explore the potential of these microstructures for applications in programmable flow and modular fluidics.

Main Methods:

  • Fabrication of asymmetric microstructures (triangular protrusions and tilted microcones) using 3D printing.
  • Decoration of microstructures with a nanoparticle-based sprayable slippery coating.
  • Investigation of unidirectional wettability, droplet sliding, and liquid spreading behavior.

Main Results:

  • Both microstructure types demonstrated unidirectional wettability, enabling directional droplet sliding and liquid spreading.
  • The slippery coating enhanced water repellency, unlocking functions such as erasable liquid channels and programmable flow control.
  • Tuning the motion resistance of microstructures allowed for complex pathways, ordered flow transport, and flow-based logic circuits.

Conclusions:

  • The developed slippery asymmetric microstructures offer versatile liquid control for droplets and flow.
  • This approach unifies different microstructure designs and provides insights into resistance tuning for unidirectional fluid transport.
  • The findings pave the way for diverse liquid-manipulating interfaces and advanced fluidic devices.