Contact Angle Stability: Reorganization of Monolayer Surfaces?

Stephen D. Evans, Ravi Sharma, Abraham Ulman

Research output: Contribution to journalArticle

Abstract

Contact angle variation was studied on self-assembled alkanethiol monolayers containing mixtures of OH and CH3 groups at their air/monolayer interface. It was found that these high free energy organic surfaces yielded contact angles which were not stable over long periods of time. The extent of the variation was found to be related to the surface free energy (percent OH). The effect of different storage environments and temperature on the changing contact angles is discussed. We propose that monolayer surfaces containing high concentrations of OH groups on mobile organic chains are not stable. Such monolayer surfaces may stabilize, over a time dependent on the chain length, by surface reorganization and the adsorption of contaminants.

Original languageEnglish (US)
Pages (from-to)156-161
Number of pages6
JournalLangmuir
Volume7
Issue number1
DOIs
StatePublished - Jan 1 1991

ASJC Scopus subject areas

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

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