Zhang Xiaolong, Scaraggi Michele, Zheng Youbin, Li Xiaojuan, Wu Yang, Wang Daoai, Dini Daniele, Zhou Feng
State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.
Hubei Key Laboratory of Hydroelectric Machinery Design & Maintenance, China Three Gorges University, Yichang, 443002, China.
Adv Sci (Weinh). 2022 Aug;9(24):e2200822. doi: 10.1002/advs.202200822. Epub 2022 Jun 8.
Wetting is often perceived as an intrinsic surface property of materials, but determining its evolution is complicated by its complex dependence on roughness across the scales. The Wenzel (W) state, where liquids have intimate contact with the rough surfaces, and the Cassie-Baxter (CB) state, where liquids sit onto air pockets formed between asperities, are only two states among the plethora of wetting behaviors. Furthermore, transitions from the CB to the Wenzel state dictate completely different surface performance, such as anti-contamination, anti-icing, drag reduction etc.; however, little is known about how transition occurs during time between the several wetting modes. In this paper, wetting dynamics can be accurately quantified and tracked using solid-liquid triboelectrification. Theoretical underpinning reveals how surface micro-/nano-geometries regulate stability/infiltration, also demonstrating the generality of the authors' theoretical approach in understanding wetting transitions. It can clarify the functioning behavior of materials in real environment.
润湿通常被视为材料的一种固有表面特性，但其演变过程因对不同尺度粗糙度的复杂依赖而变得复杂。在文策尔（W）状态下，液体与粗糙表面紧密接触；而在卡西 - 巴克斯特（CB）状态下，液体位于粗糙峰之间形成的气穴上，这两种状态只是众多润湿行为中的两种。此外，从CB状态到文策尔状态的转变决定了完全不同的表面性能，如抗污染、防结冰、减阻等；然而，对于在几种润湿模式之间的转变如何随时间发生，人们知之甚少。在本文中，利用固 - 液摩擦起电可以准确地量化和跟踪润湿动力学。理论基础揭示了表面微/纳米几何结构如何调节稳定性/浸润性，也证明了作者的理论方法在理解润湿转变方面的通用性。它可以阐明材料在实际环境中的功能行为。
