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Proceedings Paper

Electrooptical properties of metal organic ionic liquid crystals
Author(s): Gertruda V. Klimusheva; Alexandr V. Koval'chuk; N. Volynets; Alexander Yu. Vakhnin
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Paper Abstract

Electro-optics of smectic liquid crystals has been drawing an increasing interest, especially for new classes of compounds, such as metal alkanoates, which manifest as thermotropic as lyotropic smectic mesophases. In the present work electric and electro-optic properties were studied of pure and dye-doped (polymethine dye) potassium kaproate, a water mixture of which is forming a lyotropic Sm A type liquid crystalline phase at room temperature. As follows from experimental data, for frequencies - f < 3 X 104 Hz, dispersion of the components of complex dielectric permittivity ε' and ε" is observed. Appropriate relaxation process is described by the Debye equation. On the basis of the analysis of frequency dependencies of (epsilon) ', (epsilon)" for the frequencies f > 3 X 104 Hz the conductivity of samples on an alternating current was found. The introduction of dye in ionic lyotropic liquid crystals (ILLC) results in an increase of conductivity (by 1,5 times) and reduction of relaxation time. The bleaching of the dye in ILLC under the action of a direct voltage (U > 5V) was observed. The mechanism explaining threshold character of such process was proposed.

Paper Details

Date Published: 27 June 2002
PDF: 6 pages
Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); doi: 10.1117/12.472178
Show Author Affiliations
Gertruda V. Klimusheva, Institute of Physics (Ukraine)
Alexandr V. Koval'chuk, Institute of Physics (Ukraine)
N. Volynets, Institute of Physics (Ukraine)
Alexander Yu. Vakhnin, Institute of Physics (Ukraine)


Published in SPIE Proceedings Vol. 4759:
XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications

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