Synchrotron studies of the first-order melting transitions of hexatic monolayers and multilayers in freely suspended liquid-crystal films
Journal Article
·
· Phys. Rev. A; (United States)
Synchrotron x-ray diffraction has been used to study the surface and the interior hexatic-to-liquid (smectic-I to smectic-C) melting transitions of freely suspended liquid-crystal films of N-(4'-(n-heptyl)benzylidene)-4-(n-heptyl)aniline (7O.7) five molecular layers thick. Both the surface hexatic monolayers and the interior hexatic layers melt via hysteretic first-order transitions. After the two surface layers undergo a first-order transition to the smectic-I phase, the surface hexatic correlation length xi evolves smoothly from approx.100 to approx.300 A with a roughly square-root form, xiapprox.chemically bondT-T/sub c/chemically bond/sup 1/2/.
- Research Organization:
- Division of Applied Sciences and Department of Physics, Harvard University, Cambridge, Massachusetts 02138
- OSTI ID:
- 6227867
- Journal Information:
- Phys. Rev. A; (United States), Vol. 39:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
LIQUID CRYSTALS
MELTING
ORGANIC COMPOUNDS
SYNCHROTRON RADIATION
THIN FILMS
X-RAY DIFFRACTION
BREMSSTRAHLUNG
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELECTROMAGNETIC RADIATION
FILMS
FLUIDS
LIQUIDS
PHASE TRANSFORMATIONS
RADIATIONS
SCATTERING
360602* - Other Materials- Structure & Phase Studies
LIQUID CRYSTALS
MELTING
ORGANIC COMPOUNDS
SYNCHROTRON RADIATION
THIN FILMS
X-RAY DIFFRACTION
BREMSSTRAHLUNG
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
ELECTROMAGNETIC RADIATION
FILMS
FLUIDS
LIQUIDS
PHASE TRANSFORMATIONS
RADIATIONS
SCATTERING
360602* - Other Materials- Structure & Phase Studies