Helical smectic A* phase (TGBaphase) in some tolan series
- 1 September 1991
- journal article
- research article
- Published by Taylor & Francis in Ferroelectrics
- Vol. 121 (1) , 187-204
- https://doi.org/10.1080/00150199108217623
Abstract
A helical smectic A* phase between the isotropic liquid and the ferroelectric smectic C* phase is found in three new series with very long alkoxy chains. The materials belong to the optically active series: (R) and (S) 1-methylheptyl 4′-(4″-alkoxybenzoyloxy)tolan-4-carboxylates, 4′-(4″-alkoxy-3″-fluorobenzoyloxy)tolan-4-carboxylates, 4′-(4″-alkoxy-2′,3″-difluorobenzoyloxy)tolan-4-carboxylates. This new phase has two typical textures: filament texture when the helix pitch is large and cholesteric texture (Grandjean texture) with a short pitch.Keywords
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