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Nanosecond time scale dynamics of pseudo-nematic domains in the isotropic phase of liquid crystals

✍ Scribed by John J. Stankus; Renato Torre; C.D. Marshall; S.R. Greenfield; A. Sengupta; A. Tokmakoff; M.D. Fayer

Publisher: Elsevier Science
Year: 1992
Tongue: English
Weight: 245 KB
Volume: 194
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(92)85537-k

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✦ Synopsis

The slow reorientational dynamics of isotropic methoxybenzylidene-butylaniline (MBBA) were measured, using a transient grating optical Kerr effect experiment, over a wide temperature range (49.4 °-119.7 ° C). The range of validity of the Landau-de Gennes theory for hydrodynamic relaxation in ordered fluids is determined. The results are compared to previous experiments on pentylcyanobiphenyl (5CB). Both liquid crystals conform to the Landau-de Gennes theory until the pseudo-nematic domain correlation length falls below three molecular lengths.

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