PMID: 15244831Jul 13, 2004Paper

Anisotropy and nonequilibrium effects on the light scattered from suspension in a nematic solvent

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
H Híjar, R F Rodríguez

Abstract

We investigate the effects produced on the light scattering spectrum by the anisotropic diffusion of impurities in an incompressible nematic solvent. The spectrum is calculated by using a fluctuating hydrodynamic description when the system is both in a fully thermodynamic equilibrium state and in a nonequilibrium steady state induced by a dye-concentration gradient. In the former state, the isotropic pretransitional phase as well as the nematic phase of the solvent are considered. This spectrum is symmetric (Lorentzian) with respect to the frequency shifts, but anisotropic through its explicit dependence on the ratio of the diffusion coefficients of the dye parallel and normal to the mean molecular axis of the nematic. The values of these coefficients were taken from experimental measurements of diffusion of methylred and nitrosodimethylaniline in a N -( p -methoxybenzylidene)- p -butylaniline (MBBA) solvent. This anisotropy changes the height and the width at mid height with respect to the isotropic case in amounts which for MBBA vary up to 36% and 26%. We also calculate the spectrum in the presence of a concentration gradient of the dye and find that its presence gives rise to an asymmetry of the spectrum in its dependence o...Continue Reading

References

Aug 15, 1987·Physical Review A: General Physics· San Miguel M, F Sagués
Feb 15, 1990·Physical Review. a·J B AvalosA Pérez-Madrid

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Citations

May 24, 2011·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Humberto Híjar, Godehard Sutmann
Sep 17, 2013·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·R F RodríguezE Salinas-Rodríguez

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