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Temperature-Dependent Tilt Angle in the Smectic C Phase of a Liquid Crystal

1970; American Physical Society; Volume: 25; Issue: 11 Linguagem: Inglês

10.1103/physrevlett.25.722

1092-0145

T. R. Taylor, S. L. Arora, James L. Fergason,

Nonlinear Dynamics and Pattern Formation

Measurement of the tilt angle of the smectic $C$ phase of terephthal-bis-($4\ensuremath{-}n\ensuremath{-}\mathrm{b}\mathrm{u}\mathrm{t}\mathrm{y}\mathrm{l}\mathrm{a}\mathrm{n}\mathrm{i}\mathrm{l}\mathrm{i}\mathrm{n}\mathrm{e}$) has been made using conoscopic observation and circularly polarized light. The new phenomenon of a smectic $C$ phase with a temperature-dependent tilt angle is reported. Terephthal-bis-($4\ensuremath{-}n\ensuremath{-}\mathrm{b}\mathrm{u}\mathrm{t}\mathrm{y}\mathrm{l}\mathrm{a}\mathrm{n}\mathrm{a}\mathrm{l}\mathrm{i}\mathrm{n}\mathrm{e}$) has nematic, smectic $A$, smectic $C$, and smectic $B$ liquid-crystalline phases. The tilt angle of smectic $C$ changes from 0\ifmmode^\circ\else\textdegree\fi{} at the smectic-$A\ensuremath{-}\mathrm{s}\mathrm{m}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{-}C$ transition to approximately 26\ifmmode^\circ\else\textdegree\fi{} at the $\mathrm{s}\mathrm{m}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{-}C\ensuremath{-}\mathrm{s}\mathrm{m}\mathrm{e}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{c}\ensuremath{-}B$ transition temperature.