Correlation between Surface Free Energy and Surface Constitution

Abstract

Self-assembled monolayers (SAMs) of alkylsiloxanes on elastomeric PDMS (polydimethylsiloxane) were used as model systems to study interactions between surfaces. Surface free energies of these chemically modified surfaces were estimated by measuring the deformations that resulted from the contact between small semispherical lenses and flat sheets of the elastomer under controlled loads. The measured surface free energies correlated with the surface chemical compositions of the SAMs and were commensurate with the values estimated from the measurements of contact angles. This study provides, for the first time, direct experimental evidence for the validity of estimates of the surface free energies of low-energy solids obtained from contact angles.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1992
Accession Number
ADA246699

Entities

People

  • George M. Whitesides
  • Manoj K Chaudhury

Organizations

  • Harvard University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Adhesion
  • Alkanes
  • Chemical Composition
  • Chemical Synthesis
  • Chemistry
  • Energy
  • Equations
  • Ethers
  • Fatty Acids
  • Fluorinated Hydrocarbons
  • Fluoropolymers
  • Free Energy
  • Hysteresis
  • Materials
  • Military Research
  • Monomolecular Films
  • Self Assembled Monolayers

Readers

  • Materials Science and Engineering.
  • Surface Coatings Technology.
  • Thin Film Deposition Science.