A CHIRAL MATERIAL WITH A NEW PHASE SEQUENCE - TWIST GRAIN-BOUNDARY SMECTIC-A PHASE - BLUE PHASES

Authors
LI MH NGUYEN HT SIGAUD G
Citation
Mh. Li et al., A CHIRAL MATERIAL WITH A NEW PHASE SEQUENCE - TWIST GRAIN-BOUNDARY SMECTIC-A PHASE - BLUE PHASES, Liquid crystals, 20(3), 1996, pp. 361-365
Citations number
23
Categorie Soggetti
Crystallography
Journal title
Liquid crystals → ACNP
ISSN journal
02678292
Volume
20
Issue
3
Year of publication
1996
Pages
361 - 365
Database
ISI
SICI code
0267-8292(1996)20:3<361:ACMWAN>2.0.ZU;2-I
Abstract
A new phase sequence: twist grain boundary S, phase to blue phases was observed in a chiral compound (R)- or (S)-1-methylheptyl 3'-fluoro-4' -(3 ''-fluoro-4 ''-octadecyloxybenzoyloxy)tolan-4-carboxylate. It is t he first time that blue phases have been found to occur above the TGBA phase in the absence of a cholesteric phase. These phases were charac terized by microscopic observation, differential scanning calorimetry, the contact method and study of the racemic system.