Hydrophobicity of surfaces with cavities: Making hydrophobic substrates from hydrophilic materials?

Neelesh A Patankar*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter

42 Scopus citations

Abstract

Rough surfaces made of hydrophobic materials are known to exhibit enhanced hydrophobicity. Similarly, rough surfaces made of hydrophilic materials show increased hydrophilic behavior. The energetics of these observations is well explained by either Wenzel's or Cassie-Baxter's formulas. Recent experimental results have shown that rough surfaces made of hydrophilic materials can exhibit hydrophobic behavior. The idea is to make a rough surface with cavities. The apparent contact angle of a drop on such surfaces is reported to agree with Cassie-Baxter's formula even when the substrate material is hydrophilic. Others have interpreted this to imply that air remains trapped in the cavities after a liquid drop is deposited on it, thus making it effectively hydrophobic. In this work, we consider the effective energy of such surfaces theoretically.

Original languageEnglish (US)
Title of host publicationSuperhydrophobic Surfaces
PublisherCRC Press
Pages51-72
Number of pages22
ISBN (Electronic)9789004193338
ISBN (Print)9789004165939
StatePublished - Jan 1 2009

Keywords

  • Cavities
  • Energy minimization
  • Hydrophilic
  • Hydrophobic

ASJC Scopus subject areas

  • Chemistry(all)

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