Biaxial Liquid Crystals
1970; American Physical Society; Volume: 24; Issue: 8 Linguagem: Inglês
10.1103/physrevlett.24.359
ISSN1092-0145
AutoresT. R. Taylor, James L. Fergason, S. L. Arora,
Tópico(s)Optical Polarization and Ellipsometry
ResumoConvergent light observations have been made on three liquid crystalline substances with nematic and smectic phases. The nematic phase was observed to be uniaxial as expected, but smectic $C$ was found to be biaxial. The optic axial angle $2V$ for smectic $C$ was found to be on the order of 20\ifmmode^\circ\else\textdegree\fi{} for all three compounds. Also, the tilt angle for smectic $C$ is nearly 45\ifmmode^\circ\else\textdegree\fi{} for all three liquid-crystal systems. Anisotropy of the degrees of order is suggested as a partial explanation for the biaxial character of smectic $C$.
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