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.

Tribology of Non-Adhesive Surfaces: Superhydrophobicity and Wetting Regime Transitions

Published

Author(s)

Michael Nosonovsky, Bharat Bhushan

Abstract

Non-adhesive and water-repellent surfaces are required for many tribological applications. Wetting of patterned superhydrophobic Si surfaces is studied as a multiscale process involving the macroscale (water droplet size), microscale (surface texture size), and nanoscale (molecular size). We study fundamental mechanisms of wetting, including the transition between various wetting regimes during microdroplet evaporation in environmental scanning electron microscope (ESEM), contact angle and contact angle hysteresis. We propose a generalized formulation of the Wenzel and Cassie equations, which is consistent with the broad range of experimental data. We show that the contact angle hysteresis involves two different mechanism and how transition from metastable partially wetted (Cassie) states to homogeneously wetted (Wenzel) stated depend upon droplet size and surface pattern parameters.
Citation
Langmuir

Keywords

contact angle, superhydrophobic surfaces

Citation

Nosonovsky, M. and Bhushan, B. (2017), Tribology of Non-Adhesive Surfaces: Superhydrophobicity and Wetting Regime Transitions, Langmuir (Accessed July 17, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created February 19, 2017