Electrooptical properties of metal organic ionic liquid crystals

Gertruda V. Klimusheva; Alexandr V. Koval'chuk; N. Volynets; Alexander Yu. Vakhnin

doi:10.1117/12.472178

27 June 2002 Electro-optical properties of metal organic ionic liquid crystals

Gertruda V. Klimusheva, Alexandr V. Koval'chuk, N. Volynets, Alexander Yu. Vakhnin

Proceedings Volume 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications; (2002) https://doi.org/10.1117/12.472178
Event: XIV Conference on Liquid Crystals, Chemistry, Physics, and Applications, 2001, Zakopane, Poland

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.

Citation Download Citation

Gertruda V. Klimusheva, Alexandr V. Koval'chuk, N. Volynets, and Alexander Yu. Vakhnin "Electro-optical properties of metal organic ionic liquid crystals", Proc. SPIE 4759, XIV Conference on Liquid Crystals: Chemistry, Physics, and Applications, (27 June 2002); https://doi.org/10.1117/12.472178

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