The effect of liquid-induced adhesion changes on the interfacial shear strength between self-assembled monolayers

Dmitri V. Vezenov, Aleksandr Noy, Charles M. Lieber

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Friction between chemically-modified tips and surfaces has been studied with chemical force microscopy (CFM) to evaluate the effect of changing solid/liquid free energy on energy dissipation in sliding tip-surface contact. Well-controlled conditions were necessary to attain a single asperity contact in these experiments. We found that in a series of methanol-water mixtures the interfacial shear strength between CH3-terminated surfaces of the siloxane self-assembled monolayers (SAMs) was independent of the adhesion force. The shear strength value of 10.2 ± 1.0 MPa found for this interface under methanol-water media is consistent with the previous studies of similar systems under dry gas conditions. A comparison to available data on interfacial shear strengths demonstrated that siloxane monolayers were much more effective in reducing friction than various carbon coatings.

Original languageEnglish (US)
Pages (from-to)1385-1401
Number of pages17
JournalJournal of Adhesion Science and Technology
Volume17
Issue number10
DOIs
StatePublished - 2003
Externally publishedYes

Keywords

  • Adhesion
  • Chemical force microscopy
  • Contact mechanics
  • Friction
  • Interfacial shear strength
  • Self-assembled monolayers
  • Surface free energy

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Computational Mechanics
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Chemistry(all)
  • Surfaces and Interfaces

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