Strain-controlled switching of hierarchically wrinkled surfaces between superhydrophobicity and superhydrophilicity

Zuoqi Zhang, Teng Zhang, Yong Wei Zhang, Kyung Suk Kim, Huajian Gao

Research output: Contribution to journalArticle

38 Scopus citations

Abstract

Recent years have witnessed intense interest in multifunctional surfaces that can be designed to switch between different functional states with various external stimuli including electric field, light, pH value, and mechanical strain. The present paper is aimed to explore whether and how a surface can be designed to switch between superhydrophobicity and superhydrophilicity by an applied strain. Based on well-established theories of structure buckling and solid-liquid contact, we show that this objective may be achieved through a hierarchically wrinkled surface. We derive general recursive relations for the apparent contact angle at different levels of the hierarchical surface and investigate the thermodynamic stability of different contact states. Our study may provide useful guidelines for the development of multifunctional surfaces for many technological applications.

Original languageEnglish (US)
Pages (from-to)2753-2760
Number of pages8
JournalLangmuir
Volume28
Issue number5
DOIs
StatePublished - Feb 7 2012
Externally publishedYes

ASJC Scopus subject areas

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

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