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Domain Structures and Phase Transitions in Langmuir Monolayers

Published online by Cambridge University Press:  21 February 2011

Xia Qiu ,
Jaime Ruiz-Garcia  and
Charles M. Knobler
Xia Qiu
Affiliation:
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90024
Jaime Ruiz-Garcia
Affiliation:
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90024
Charles M. Knobler
Affiliation:
Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90024
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Abstract

A variety of recent measurements has shown that the phase diagrams of Langmuir monolayers of relatively simple amphiphiles such as fatty acids and their methyl and ethyl esters are remarkably complex. Nine condensed phases have been identified; their structures can be related to those of known smectic phases. A key distinction between phases is the orientation of the molecular tilt azimuth with respect to the local hexagonal order of the head groups. When monolayers are examined by fluorescence microscopy, regions of uniform tilt can be observed if the exciting radiation is polarized with respect to the surface normal. The tilt regions form patterns similar to those observed in freely suspended films of smectic liquid crystals. The patterns can be changed by compressing the film and by changing the temperature. Transitions between different phases can be observed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 237: Symposium Ca – Interface Dynamics and Growth , 1991 , 263
Copyright
Copyright © Materials Research Society 1992

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References

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