Abstract
Inspired by the skin of Osteichthyes fishes, a Janus hydrogel coating consisting of slippery and sticky layers is successfully prepared by a two‐step UV light irradiation at room temperature. The slippery layer replicates the structure of cycloid scales, while the nature of hydrogel mimics the mucus on fish skin. The Janus hydrogel coating possesses prominent mechanical, anti‐fouling and drag reduction properties. More details are discussed in the article by Xue et al. on page 867—872.image
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