Lattice structures and molecular tilts in Langmuir monolayers of saturated fatty acid-alcohol mixtures

M. C. Shih*, M. K. Durbin, A. Malik, P. Zschack, Pulak Dutta

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

We have studied Langmuir monolayers composed of mixtures of heneicosanoic acid and heneicosanol using π-A isotherms and x-ray diffraction. We find that the two materials are miscible in monolayer form. We have determined how the phase diagram of the acid evolves to that of the alcohol as the composition varies. X-ray diffraction data along isotherms and isobars show that the head-head interactions, like the tail-tail interactions, are anisotropic. The "swiveling transition" between phases with different tilt directions is accompanied by a rotation of the molecules about their long axes.

Original languageEnglish (US)
Pages (from-to)9132-9136
Number of pages5
JournalThe Journal of Chemical Physics
Volume101
Issue number10
DOIs
StatePublished - Jan 1 1994

ASJC Scopus subject areas

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

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