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Abstrakty
Electrooptics 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 electrooptic properties were studied in detail 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 ε' ε'' 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 increase in 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.
Wydawca
Czasopismo
Rocznik
Tom
Strony
39--42
Opis fizyczny
Bibliogr. 9 poz.
Twórcy
autor
autor
autor
autor
- Institute of Physics, 46 Nauki Ave., 03-028 Kiev, Ukraine, klimush@iop.kiev.ua
Bibliografia
- 1. T. A. Mirnaya, V. D. Prisyazhnyi, and V. A. Shcherbakov, "The liquid-crystalline state of salt melts containing organic ions", Russ. Chem. Rev. 58, 1429-1450 (1989).
- 2. A. A. Ishchenko, Structure and Spectral Luminescent Properties of Polymethine Dyes, p. 232, Naukova Dumka, Kiev, 1994.
- 3. N. Volynets, N. Derevyanko, A. A. Ishchenko, G. Klimusheva, T. Mirnaya, G. Yaremchuk, and L. Yatsenko, Proc. SPIE 4418, 38-43 (2001).
- 4. F. J. Twarowski and A. C. Albrecht, "Depletion layer studies in organic films: Low frequency capacitance measurements in polycrystalline tetracene", J. Chem. Phys. 20, 2255-2261 (1980).
- 5. A. V. Koval'chuk, "Low-frequency dielectric spectroscopy a an investigation method of electrode - liquid interface", Functional Materials 5, 426-430 (1998).
- 6. T. L. Chelidze A. I. Derevyanko, and O. D. Kurilenko, Electrical Spectroscopy of Heterogeneous Systems, p. 231 Naukova Dumka, Kiev, 1977. (in Russian).
- 7. S. G. Yudin, L. M. Blinov, N. N. Petukhova, and S. P. Palto, "Ferroelectric phase transition in Langmuir-Blodgett films of copper phthalocyanine", JETP Letters 70, 565-648 (1999).
- 8. A. V. Koval'chuk, "Low and infralow - frequency dielectric spectroscopy of the liquid crystal-solid substrate interface. Sliding layers", Ukr. J. Phys. 41, 991-998 (1996). (in Ukrainian).
- 9. A. V. Koval'chuk, "Generation of charge carriers and formation of antisymmetric double electric layers in glycerine", J. Chem. Phys. 108, 8190-8194 (1998).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-article-BWA2-0006-0071