Journal article
Positional order in Langmuir monolayers: An X-ray diffraction study
The structural phase transition from the hexagonal to a distorted-hexagonal (centered rectangular) phase (the LS-S transition) in Langmuir monolayers of octadecanol is studied in a grazing incidence x-ray diffraction experiment. We find algebraic decay of positional correlations, which suggests solid-like order in both phases at the distances accessible in the present x-ray diffraction experiment.
The transition is accompanied by strong positional disorder, which is evident from the drastic increase of the exponent eta to values eta>2 close to the transition. Remarkably, on approaching the transition, the continuous increase of eta is apparent already at 20 degrees C above it. The positional disorder is attributed to elastic distortions around pretransitional fluctuations. [S1063-651X(99)10102-8].
Language: | English |
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Publisher: | American Physical Society |
Year: | 1999 |
Pages: | 2141-2152 |
ISSN: | 10953787 , 1063651x , 15502376 , 15393755 , 24700053 and 24700045 |
Types: | Journal article |
DOI: | 10.1103/PhysRevE.59.2141 |