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3D Bioinspired Microstructures for Switchable Repellency in both Air and Liquid.

Xiaojiang Liu1,2, Hongcheng Gu1, Haibo Ding1

  • 1State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 26, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed switchable water/oil repellent surfaces using 3D microstructures. These surfaces work for a wide range of liquid surface tensions in air and liquid, inspired by nature.

Keywords:
3D printingliquid responsive bendingre‐entrant microstructuresswitchable repellencyuniversal repellency

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Area of Science:

  • Materials Science
  • Surface Science
  • Microfluidics

Background:

  • Superhydrophobic and superoleophobic surfaces offer advanced properties.
  • Switchable water/oil repellency is crucial for microfluidics and sensors.
  • Existing surfaces are limited to high surface tension liquids (> 25.0 mN m⁻¹).

Purpose of the Study:

  • To create switchable repellent surfaces for a broad range of liquid surface tensions.
  • To enable repellency in both air and liquid environments.
  • To explore stimuli-responsive microstructures for tunable surface properties.

Main Methods:

  • Fabrication of 3D deformable multiply re-entrant microstructures using two-photon polymerization 3D printing.
  • Tuning reversible deformation via evaporation-induced bending and immersion-induced recovery.
  • Investigating repellency/penetration behavior at three-phase interfaces.

Main Results:

  • Achieved switchable repellency for liquids with surface tensions from 12.0 to 72.8 mN m⁻¹.
  • Demonstrated reversible deformation for tunable surface properties.
  • Provided insights into repellency mechanisms at the three-phase interface.

Conclusions:

  • Developed novel 3D microstructures for switchable liquid repellency.
  • Enabled broad applicability across various liquid surface tensions and environments.
  • Opened new avenues for designing stimuli-responsive surfaces for advanced applications.