Hydrodynamic and electrohydrodynamic properties of the smectic CM phase in liquid crystalsReport as inadecuate




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Abstract : We present the hydrodynamic and electrohydrodynamic equations for the liquid crystalline smectic CM phase. This phase, which is fluid in the layers, orthogonal and optically biaxial, has recently been found experimentally in polymeric liquid crystals. We compare the macroscopic properties of the CM phase with those of the classical fluid smectic phases, namely smectic A, which is uniaxial, and the classical smectic C phase, that is tilted and biaxial. We predict that the in-plane director in the CM phase can show flow alignment. We point out that the chiralized version of smectic CM, C*M, has electromechanical properties, that are qualitatively different from those of chiral smectic C*, but rather similar to those of a classical cholosteric phase. In contrast to C*, C*M is not helielectric and thus does not show a linear response to an externally applied spatially homogeneous electric field, except for an electroclinic effect near phase transitions to a tilted phase. But similarly to C* and cholesterics it is predicted to show piezoelectricity.





Author: Helmut Brand Harald Pleiner

Source: https://hal.archives-ouvertes.fr/



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