Multiple ordered phases in Langmuir-Blodgett films of cadmium arachidate at elevated temperatures

Peng, J. B., Foran, G. J., Barnes, G. T. and Gentle, I. R. (2003) Multiple ordered phases in Langmuir-Blodgett films of cadmium arachidate at elevated temperatures. Langmuir, 19 11: 4701-4706. doi:10.1021/la027007+


Author Peng, J. B.
Foran, G. J.
Barnes, G. T.
Gentle, I. R.
Title Multiple ordered phases in Langmuir-Blodgett films of cadmium arachidate at elevated temperatures
Journal name Langmuir   Check publisher's open access policy
ISSN 0743-7463
Publication date 2003-05-01
Sub-type Article (original research)
DOI 10.1021/la027007+
Volume 19
Issue 11
Start page 4701
End page 4706
Total pages 6
Place of publication Washington DC
Publisher American Chemical Society
Language eng
Subject C1
250103 Colloid and Surface Chemistry
780103 Chemical sciences
0306 Physical Chemistry (incl. Structural)
0903 Biomedical Engineering
0904 Chemical Engineering
Abstract Using synchrotron X-ray grazing incidence diffraction, superlattice structures have been observed to develop in Langmuir-Blodgett films of cadmium arachidate as the temperature is raised. The previously reported superstructure in the stacked lamellae at room temperature changes at about 70 degreesC and there are further changes at about 90 and 103 degreesC before the major phase transition from stacked lamellae to hexagonally packed rods occurs at 107 degreesC (Langmuir 1997, 13, 1602). Between 70 and 103 degreesC there is a 1 x 10 one-dimensional in-plane superstructure, which is commensurate with the local structure and has an interlayer shift along [01] by a distance of b (of the local structure) at lower temperatures, and a further shift at about 90 degreesC. At lower (<90 degreesC) temperatures, the local in-plane structure retains rectangular symmetry with the chains perpendicular to the film plane (d(001) = 55.4 Angstrom). At temperatures above 90 degreesC, an oblique local structure develops in the film plane, but the value of d(001) is unchanged. At about 103 degreesC, the superstructure evolves into an oblique net covering 20 x 10 molecules, commensurate with the local structure, and the value of d(001) reduces to 53.0 Angstrom. Rearrangement of the cadmium cations in the film is suggested for the development of the superstructures.
Keyword Chemistry, Physical
X-ray-diffraction
Integrated Optical Techniques
Disorder Transitions
Structural-changes
Thin-films
Monolayers
Multilayers
Raman
Spectroscopy
Stearate
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 11:47:04 EST