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Macroscopic dynamics near the nematic-columnar transition in liquid crystals

Physical Review A, ISSN: 1050-2947, Vol: 33, Issue: 1, Page: 643-646
1986
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We derive the dynamic equations for the macroscopic variables close to the nematic- to-hexagonal-columnar transition in discotic liquid crystals. We discuss especially the physical consequences of a static cross-coupling term between fluctuations of the discotic order parameter and gradients of the nematic director, a term omitted by previous workers. Furthermore, we predict the breakdown of flow alignment in disklike nematics close to the transition to a columnar phase and we discuss the microscopic reasons for this effect and, in general, the same type of behavior for other liquid crystalline phases with positional order such as smectic-A, -B, -C, -G, etc. © 1986 The American Physical Society.

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