Shear rigidity of spread stearic acid monolayers on water

B. M. Abraham*, J. B. Ketterson, K. Miyano, A. Kueny

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


The effect of Al3+, Fe3+, Ca2+, and Mg2+ ions and of pH on the two-dimensional shear modulus of stearic acid spread on a water substrate was determined. A large shear modulus was displayed by the films when the subphase contained Al3+ and Fe 3+ ions at the self-buffered pH. With Fe2+ dissolved in the subphase, the film displayed a viscous relaxation when strained but no residual stress was observed. No effect was observed with the Ca2+ or Mg2+. Reducing the pH value in the subphase with the trivalent ions caused the shear modulus to disappear. The observations are interpreted in terms of hydrogen bonding.

Original languageEnglish (US)
Pages (from-to)3137-3141
Number of pages5
JournalThe Journal of Chemical Physics
Issue number6
StatePublished - 1981

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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