Temperature Variation of the Layer Spacing in the Smectic A, Reentrant Nematic and Reentrant Smectic A Phases of 9 OBCAB
- 17 October 1983
- journal article
- research article
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 99 (1) , 249-253
- https://doi.org/10.1080/00268948308072046
Abstract
Precise X-ray determinations have been made of the temperature variation of the layer spacing in the smectic A, reentrant nematic and reentrant smectic A phases of a pure reentrant mesogen, viz., 4-nonyloxy-benzoyloxy-4′-cyanoazobenzene (9 OBCAB). The higher temperature smectic phase is (partially) bilayer in nature, the extent of the overlap increasing with decrease of temperature. The reentrant smectic A has a monolayer structure whose spacing is temperature independent. The change from the bilayer to monolayer arrangement is a continuous process which commences in the reentrant nematic phase and continues right through it.Keywords
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