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 (> 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 (= 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. Inspired by lotus leaves (Figure 1a(i)), springtail skin (Figure 1a(ii)), filefish skin (Figure 1a(iii)), and some other natural models, [1] scientists developed a variety of surfaces able to superrepel water in air, oil in air, water under oil, or oil under water, [2] which have found wide applications in antifouling, [3] generation of tiny liquid droplets, [4] oil-water separation, [5] and
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