Multiple equilibrium droplet shapes and design criterion for rough hydrophobic surfaces

Bo He, Neelesh A Patankar, Junghoon Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

576 Scopus citations

Abstract

The apparent contact angle on a rough surface is usually modeled by either Cassie's or Wenzel's theory. We show, on the basis of experimental evidence, that there can be two contact angles on the same rough surface, depending on how a drop is formed. A transition can occur between the different states by an external disturbance. This paper compares the theoretical prediction with matching experiments. This leads to the establishment of a design criterion for a robust hydrophobic rough surface on which the apparent contact angle will not change as a result of an external disturbance.

Original languageEnglish (US)
Pages (from-to)4999-5003
Number of pages5
JournalLangmuir
Volume19
Issue number12
DOIs
StatePublished - Jun 10 2003

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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