Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Hierarchical Roughness Makes Superhydrophobic States Stable

Published

Author(s)

Michael Nosonovsky, Bharat Bhushan

Abstract

Roughness enhances hydrophobicity of a solid surface leading to high contact angles with water. To achieve low contact angle hysteresis along with a high contact angle, superhydrophobic surfaces should form composite interface (CI) with air pockets in the valleys between asperities. The CI is often unstable and can be irreversibly transformed into the homogeneous interface. We formulate stability criterion, identify mechanisms, which lead to destabilization of the CI, and show that these mechanisms are scale-dependent. To effectively resist these scale-dependent mechanisms, a multiscale (hierarchical) roughness is required. Such multiscale roughness is found in natural and artificial superhydrophobic surfaces.
Citation
Microelectronic Engineering

Keywords

superhydrophobicity, wetting

Citation

Nosonovsky, M. and Bhushan, B. (2017), Hierarchical Roughness Makes Superhydrophobic States Stable, Microelectronic Engineering (Accessed April 16, 2024)
Created February 19, 2017