Mo Min, Bai Xingjia, Liu Zhonglin, Huang Zhimin, Xu Mengxue, Ma Lanyu, Lai Wenqin, Mo Qiufeng, Xie Songbo, Li Yanming, Huang Yifeng, Xiao Ning, Zheng Yihua
College of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China.
Guangxi Key Laboratory of Advanced Microwave Manufacturing Technology, Advanced Materials Industry Institute of Guangxi Academy of Science, Guangxi Academy of Sciences, Nanning 530007, China.
J Colloid Interface Sci. 2024 Nov;673:37-48. doi: 10.1016/j.jcis.2024.05.192. Epub 2024 Jun 8.
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.
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.
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.
在界面润湿边界，超疏水表面常被破坏，其表面的各向异性润湿性引起了众多研究者的关注。“花瓣效应”表面具有典型的各向异性润湿性。我们预测，在结构缺陷和高冲击速度的双重条件下，“花瓣效应”在表面上的粘附性会更强。
本研究参考玫瑰花瓣上的液滴状态，在超疏水表面构建结构缺陷。本文从静态和动态角度研究宏观结构缺陷对从自然的“荷叶效应”到仿生的“花瓣效应”的润湿性变化的影响。
宏观缺陷显著改变超疏水表面的静态接触角。液滴的冲击速度越高，“花瓣效应”表面（DSHS）的能量耗散越高，这提高了表面对液滴的粘附力并延长了接触时间。研究发现，缺陷结构和高冲击速度将直接影响液滴在超疏水表面上的沉积和解吸，二者都是必不可少的。这种润湿动力学规律很可能有助于对超疏水表面上液滴动态解吸的缺陷结构尺度进行定量设计。
