Effect of chirality on phase transitions in re-entrant liquid crystals
作者:
E. GORECKA,
J. MIECZKOWSKI,
LI CHEN,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 23,
issue 2
页码: 185-191
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997208433
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
The phase diagrams for enantiomers and their racemic counterparts have been compared in order to determine the influence of chirality on re-entrant phenomena. It has been found that chirality affects the location of the partially bilayer SmAd and monolayer smectic SmA1 phase areas, while the position of the smectic X phase remains nearly unchanged. This result shows that the N-SmA phase transition is influenced by a molecular chiral discrimination effect. Moreover, in enantiomeric systems, a N* re1-N* re2 phase transition has been detected by DSC within the re-entrant nematic gap which is limited by the smectic Ad and the SmX phases. Based on preliminary data, the SmX phase seems to be either a weakly tilted SmC antiphase or an incommensurate orthogonal mesophase.
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