THE EFFECT OF LIQUID STRUCTURE ON CONTACT ANGLE HYSTERESIS

Abstract

Contact angle hysteresis was measured for a variety of liquids on condensed monolayers of 17-(perfluoroheptyl)-heptadecanoic acid adsorbed on polished chromium. The hysteresis was shown to be simply related to the molecular volume of the liquid and to result from the penetration of liquid molecules into the porous monolayer. However, contact angle hysteresis was negligible when the average diameter of the liquid molecules was larger than the average cross-sectional diameter of the intermolecular pores. It is shown that it is possible to estimate intermolecular pore dimensions of such adsorbed monolayers by contact angle hysteresis measurements on a series of liquids having gradations in molecular volume. The results of this investigation reveal that liquid penetration, even into pores of molecular dimensions, is a cause of significant contact angle hysteresis, and it is also shown how liquids can be selected for contact angle investigations on organic solid surfaces so that there will be freedom from this source of hysteresis.

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Document Details

Document Type
Technical Report
Publication Date
Sep 29, 1966
Accession Number
AD0644617

Entities

People

  • C. O. Timmons
  • William A. Zisman

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Alkanes
  • Alkenes
  • Chemical Synthesis
  • Chemistry
  • Fatty Acids
  • Films
  • Finishes
  • Hydrophobic Properties
  • Methylenes
  • Military Research
  • Molecules
  • Organic Chemistry
  • Surface Chemistry
  • Surface Energy
  • Surface Properties
  • Surface Roughness
  • Surface Tension

Readers

  • Materials Science and Engineering.
  • Nanoscale Plasmonic Nanotechnology
  • Surface Engineering/Surface Coating Technology.