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

Xiaojiang LiuHongcheng GuHaibo DingXin DuMengxiao WeiQiang ChenZhong Ze Gu
Published in: Advanced science (Weinheim, Baden-Wurttemberg, Germany) (2020)
In addition to superhydrophobicity/superoleophobicity, surfaces with switchable water/oil repellency have also aroused considerable attention because of their potential values in microreactors, sensors, and microfluidics. Nevertheless, almost all those as-prepared surfaces are only applicable for liquids with higher surface tension (γ > 25.0 mN m-1) in air. In this work, inspired by some natural models, such as lotus leaf, springtail skin, and filefish skin, switchable repellency for liquids (γ = 12.0-72.8 mN m-1) in both air and liquid is realized via employing 3D deformable multiply re-entrant microstructures. Herein, the microstructures are fabricated by a two-photon polymerization based 3D printing technique and the reversible deformation is elaborately tuned by evaporation-induced bending and immersion-induced fast recovery (within 30 s). Based on 3D controlled microstructural architectures, this work offers an insightful explanation of repellency/penetration behavior at any three-phase interface and starts some novel ideas for manipulating opposite repellency by designing/fabricating stimuli-responsive microstructures.
Keyphrases
  • high glucose
  • diabetic rats
  • soft tissue
  • ionic liquid
  • drug induced
  • biofilm formation
  • room temperature
  • multiple sclerosis
  • metal organic framework
  • cystic fibrosis
  • staphylococcus aureus
  • living cells
  • candida albicans