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X-ray diffraction study of heneicosanol monolayers on the surface of water.
- Source :
- Journal of Chemical Physics; 9/15/1992, Vol. 97 Issue 6, p4485, 4p
- Publication Year :
- 1992
-
Abstract
- We have studied Langmuir monolayers of CH3(CH2)20OH (heneicosanol) using x-ray diffraction. Over the temperature range 7–55 °C, the monolayer isotherms show only one discontinuity, which may be either a ‘‘flat section’’ or a ‘‘kink;’’ we find that these are transitions between tilted and untilted phases. There are several untilted phases, with hexagonal and distorted-hexagonal structures, as in monolayers of the corresponding (heneicosanoic) acid. However, in contrast to the acid, when the pressure is lowered the molecules tilt only towards a next-nearest neighbor. The dependence of the lattice spacings on pressure and temperature indicate that the monolayer does not form a ‘‘tilted hexagonal’’ phase, even at temperatures where the untilted phase is hexagonal (rotator-II). [ABSTRACT FROM AUTHOR]
- Subjects :
- X-ray diffraction
MONOMOLECULAR films
Subjects
Details
- Language :
- English
- ISSN :
- 00219606
- Volume :
- 97
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Journal of Chemical Physics
- Publication Type :
- Academic Journal
- Accession number :
- 7650105
- Full Text :
- https://doi.org/10.1063/1.463891