润湿性与接触角滞后：密度不对称与范德华力

Wetting and Contact-Angle Hysteresis: Density Asymmetry and van der Waals Force.

作者信息

Wang Fei, Nestler Britta

机构信息

Institute for Applied Materials-Microstructure Modelling and Simulation (IAM-MMS), Karlsruhe Institute of Technology (KIT), Strasse am Forum 7, 76131 Karlsruhe, Germany and Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.

Institute for Applied Materials-Microstructure Modelling and Simulation (IAM-MMS), Karlsruhe Institute of Technology (KIT), Strasse am Forum 7, 76131 Karlsruhe, Germany; Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany and Institute of Digital Materials Science, Karlsruhe University of Applied Sciences, Moltkestrasse 30, 76133 Karlsruhe, Germany.

出版信息

Phys Rev Lett. 2024 Mar 22;132(12):126202. doi: 10.1103/PhysRevLett.132.126202.

DOI:10.1103/PhysRevLett.132.126202

PMID:38579226

Abstract

A droplet depositing on a solid substrate leads to the wetting phenomenon, such as dew on plant leaves. On an ideally smooth substrate, the classic Young's law has been employed to describe the wetting effect. However, no real substrate is ideally smooth at the microscale. Given this fact, we introduce a surface composition concept to scrutinize the wetting mechanism via considering the liquid-gas density asymmetry and the fluid-solid van der Waals interaction. The current concept enables one to comprehend counterintuitive phenomenon of contact-angle hysteresis on a smooth substrate and increase of contact angle with temperature as well as gas bubble wetting.

摘要

液滴沉积在固体基质上会导致润湿现象，例如植物叶片上的露珠。在理想的光滑基质上，经典的杨氏定律已被用于描述润湿效应。然而，在微观尺度上，没有真正的基质是理想光滑的。鉴于这一事实，我们引入了一个表面成分概念，通过考虑液-气密度不对称和流体-固体范德华相互作用来仔细研究润湿机制。当前的概念使人们能够理解光滑基质上接触角滞后的反直觉现象、接触角随温度的增加以及气泡润湿现象。