1. Temperature and depth dependence of order in liquid crystal interfaces.
- Author
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Martínez-Miranda, L. J. and Hu, Y.
- Subjects
- *
CRYSTALLINE interfaces , *LIQUID crystals , *LIGHT sources , *INTERFACES (Physical sciences) , *SURFACES (Physics) - Abstract
We have studied the depth dependence and temperature behavior of the ordering of smectic-A films close to the smectic A-nematic transition, deposited on grated glass. X-ray grazing incidence geometry in reflection mode through the glass substrate was used to characterize the samples. Our results indicate the presence of a structure similar to the helical twist grain boundary phase. The structure has two maxima, one close to the glass-liquid crystal interface and another about 8 μm above the surface. The structure at 8 μm is the one that dominates at higher temperatures. In addition, we find that order is preserved to temperatures close to the nematic-isotropic transition temperature for the deeper gratings. We find also a dependence of the orientation of the structure with the depth of the grating and the elastic constant of the liquid crystal. [ABSTRACT FROM AUTHOR]
- Published
- 2006
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