Smectic a1 ↔ a2 transition of n_c-60.8 : a two-dimensional phase separation of the molecular endgroups
Open Access
- 1 January 1989
- journal article
- Published by EDP Sciences in Journal de Physique
- Vol. 50 (3) , 375-385
- https://doi.org/10.1051/jphys:01989005003037500
Abstract
The smectic A1 ↔ A2 phase transition of a one-component liquid crystalline system was studied with X-ray diffraction. The smectogen used was a polar but symmetrical smectogen, namely the 4-cyanohexyloxybenzylidene-4'-octylaniline. The intensities of the Bragg reflections were measured as a function of temperature. The experimental data were analysed according to a structural model describing the location of the cyano and methyl endgroups of the molecules at the surface of the smectic layers. The A1 ↔ A2 transition was then interpreted in terms of a two-dimensional phase separation of the endgroupsKeywords
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