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-degrees - 119.7-degrees-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.
Nanosecond Time Scale Dynamics of Pseudo-nematic Domains In the Isotropic-phase of Liquid-crystals / J. J. STANKUS;R. TORRE;C. D. MARSHALL;S. R. GREENFIELD;A. SENGUPTA;A. TOKMAKOFF;M. D. FAYER. - In: CHEMICAL PHYSICS LETTERS. - ISSN 0009-2614. - STAMPA. - 194:(1992), pp. 213-216. [10.1016/0009-2614(92)85537-K]
Nanosecond Time Scale Dynamics of Pseudo-nematic Domains In the Isotropic-phase of Liquid-crystals
TORRE, RENATO;
1992
Abstract
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-degrees - 119.7-degrees-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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