Aggregation of Anthraquinone Dye Molecules in a Nematic Liquid Crystal

We report an experimental evidence that molecules of anthraquinone dye aggregate in an anisotropic solvent, a nematic liquid crystal (NLC). We observe strong nonlinear dependencies of the dielectric permittivity and anisotropy of light absorption on the dye concentration c. Moreover, the data sugges...

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Bibliographic Details
Published in:Molecular Crystals and Liquid Crystals 2014-01, Vol.589 (1), p.96-104
Main Authors: Soroka, P. V., Pergamenshchik, V. M., Boiko, O. P., Slominskiy, Yu. L., Gayvoronsky, V. Ya, Lisetski, L. N., Yakunin, S. V., Nazarenko, V. G.
Format: Article
Language:English
Subjects:
Aggregates
Anisotropy
Anthraquinones
concentrational nonlinearity
Dielectric properties
Dielectric strength
Dye aggregation
Dyes
Liquid crystal polymers
Liquid crystals
Molecules
Nematic
nematic solvent
Permittivity
Solvents
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Summary:We report an experimental evidence that molecules of anthraquinone dye aggregate in an anisotropic solvent, a nematic liquid crystal (NLC). We observe strong nonlinear dependencies of the dielectric permittivity and anisotropy of light absorption on the dye concentration c. Moreover, the data suggest that the aggregates are linear, but, in contrast to the isotropic case, their formation in a NLC undergoes two different concentration regimes with a well pronounced crossover. These effects are explained by the interplay between the aggregates' lengths and their orientational ordering due to the interaction with the nematic director.
ISSN:1542-1406
1563-5287
1527-1943
DOI:10.1080/15421406.2014.881217