Publication: Synchrotron X-Ray Observation of Surface Smectic-I Hexatic Layers on Smectic-C Liquid-Crystal Films
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Date
1987
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American Physical Society
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Sirota, E. B., Peter S. Pershan, Suzanne Amador, and L. B. Sorensen. 1987. Synchrotron x-ray observation of surface smectic-I hexatic layers on smectic-C liquid-crystal films. Physical Review A 35(5): 2283-2287.
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Abstract
Synchrotron x-ray diffraction methods employing a position-sensitive detector were used to study smectic-C (SmC) and smectic-I (SmI) phases in thin (2–6 molecular layers) liquid-crystal films of 4-(n-heptyloxy)benzylidene-4-(n-heptyl)aniline (7O.7). Above \(\sim 78^{\circ}C\), the entire film is SmC and below \(\sim 69^{\circ}C\), the entire film is SmI, a stacked tilted hexatic. Between \(69^{\circ}C and 78^{\circ}C\), the surface layers of the films are hexatic SmI and the interior layers are SmC. There is a pretransitional broadening of the surface hexatic peaks as the surface layers melt into the SmC phase.
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