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Superhydrophobic Self-Healing Coatings Comprised of Hemispherical Particles Arrays Decorated by Fluorocarbon-Coated Nanoscale Fe2O3 Rods and SiO2 Particles

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posted on 2020-10-13, 23:13 authored by Liujun Song, Jin Hu, Xiaofeng Huang, Li Zhong, Yongbing Pei, Lianbin Wu, Xinya Zhang
Inspired by the compound eye superhydrophobic phenomenon, the hemispherical particles with a concave (HPCs) were prepared and self-assembled into a similar array structure. To improve the roughness and mechanical durability properties, the nanoscale Fe2O3 nanorods modified by 1H,1H,2H,2H-perfluorodecyltriethoxysilane (FSA) were coated on the particles (HPC@Fe2O3) and then the SiO2 particles modified by FSA were deposited onto HPC@Fe2O3 arrays to mimic the nanoscale nipples of a compound eye. The obtained arrays show excellent superhydrophobic properties (the contact angle is 175°, and the sliding angle is 3.5°), which are mainly attributed to the stable micro/nanoscale air-cushion structure’s greatly reduced contact of water drops. After that, the self-healable poly­(dimethylsiloxane) (NH2-PDMS) elastomer was introduced as a substrate, and the composite structure can be self-healed in 2 min at room temperature after being damaged, which greatly enhances the lifespan of the superhydrophobic film. This kind of biomimicry material combining the superhydrophobic with the self-healable property has promising applications in artificial skins, wearable devices, and so on.