Measurements of the thickness compressibility of an N- octadecyltriethoxysilane monolayer self-assembled on mica

Sungsoo Kim, Kilwon Cho, Joan E. Curry

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

The surface forces apparatus technique and the Johnson-Kendall-Roberts theory were used to study the elastic properties of an n- octadecyltriethoxysilane self-assembled monolayer (OTE-SAM) on both untreated and plasma-treated mica. Our aim was to measure the thickness compressibilities of OTE monolayers on untreated and plasma-treated mica and to estimate their surface densities and phase-states from the film compressibility. The compressibility moduli of OTE are (0.96 ± 0.02) × 10 8 N/m 2 on untreated mica and (1.24 ± 0.06) × 108 N/m 2 on plasma-treated mica. This work suggests that the OTE phase-state is pseudocrystalline. In addition, the results from the compressibility measurements in water vapor suggest that the OTE-SAM on both untreated and plasma-treated mica is not homogeneous but rather contains both crystalline polymerized OTE domains and somewhat hydrophilic gaseous regions.

Original languageEnglish (US)
Pages (from-to)8290-8296
Number of pages7
JournalLangmuir
Volume21
Issue number18
DOIs
StatePublished - Aug 30 2005

ASJC Scopus subject areas

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

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