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Defect by design: Harnessing the “petal effect” for advanced hydrophobic surface applications

Min Mo,Xingjia Bai,Zhonglin Liu,Zhimin Huang,Mengxue Xu,Lanyu Ma,Wenqin Lai,Qiufeng Mo,Songbo Xie,Yanming Li,Yifeng Huang,Ning Xiao,Yihua Zheng

Hypothesis: In the interfacial wetting boundary, the superhydrophobic surface is often damaged, and the anisotropic wettability of its surface has attracted many researchers’ attention. The “petal effect” surface has typical anisotropic wettability . We predict that under the dual conditions of structural defects and high impact velocity , the “petal effect” becomes more adhesive on the surface. Experiments: This study refers to the droplet state on rose petals, structural defects were constructed on the superhydrophobic surface. This paper studies the influence of macro-structural defects on the wettability change from natural to bionic “lotus effect” to “petal effect” in both static and dynamic angles. Findings: Macro defects significantly change the static contact angle of the superhydrophobic surface. The higher the impact velocity of the droplet, the higher the energy dissipation of the “petal effect” surface (DSHS), which improves the adhesion of the surface to the droplet and prolongs the contact time. It is found that the defect structure and high impact velocity will directly affect the deposition and desorption of droplets on the superhydrophobic surface, and they are both essential. This wetting dynamic law is very likely to be helpful in the quantitative design of defect structure scale for dynamic desorption of droplets on superhydrophobic surfaces.