Blue phases and twist grain boundary phases (TGBA and TGBC) in a series of fluoro-substituted chiral tolane derivatives
作者:
MIN-HUI LI,
VALERIE LAUX,
HUU-TINH NGUYEN,
GILLES SIGAUD,
PHILIPPE BAROIS,
NOEL ISAERT,
期刊:
Liquid Crystals
(Taylor Available online 1997)
卷期:
Volume 23,
issue 3
页码: 389-408
ISSN:0267-8292
年代: 1997
DOI:10.1080/026782997208325
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
A series of fluoro-substituted tolane derivatives: (R)-1-methylheptyl 3-fluoro-4-(3-fluoro-4- n alkoxybenzoyloxy)tolane-4-carboxylates is reported. Some members of this series exhibit the phase sequence: Cr-SmC*-TGBC-TGBA-BPI-BPII-BPIII-I. The blue phases, the TGBA and TGBC phases and the SmC* phase were characterized in detail by microscopic observation, differential scanning calorimetry, helical pitch measurements, X-ray structural analysis and electro-optical study. The blue phases directly next to the TGBA phase were shown to be a new type of blue phase exhibiting smectic ordering. A commensurate TGBC phase with constant number of slabs per pitch was observed.
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