Exotism around the smectic a state in associated liquid crystals

F. Hardouin

Physica A: Statistical Mechanics and its Applications, 1986, vol. 140, issue 1, 359-367

Abstract: Of greatest current interest is a class of thermotropic mesomorphic compounds containing a long aromatic core and a strongly polar end group (CN or NO2). A considerable variety of phase diagrams have been experimentally and theoretically described by the Bordeaux group1−3). The first conclusion was to challenge the uniqueness of the smectic A state and consequently to divide the smectic A phases into different basic groups depending on the layering arrangement. Another point of interest of these polymorphisms was that multi-reentrant nematics or intermediate 2D states often separate two smectic A phases. Although these 2D mesophases possess a long range modulation inside the layers, they remain smectics with liquid-like ordered layers at short range. Finally, such anomalies of periodicity have been recently observed in other LC classes: 1) peculiar electron donor-acceptor systems with a polymorphism of smectic A phases at low temperature; 2) nonpolar systems with liquid crystalline side-chain polymers.

Date: 1986
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:140:y:1986:i:1:p:359-367

DOI: 10.1016/0378-4371(86)90242-6

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