Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal
Solutions of fullerene molecules С60 with chemically attached molecules of diamine (С60D) in planar oriented nematic liquid crystal (NLC) were obtained by only heating and ultrasonic processing. The С60D concentration changes from 0 up to 3.0 wt.%. Within the ranges of frequencies 10⁻¹ – 10⁶ Hz and...
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| Опубліковано в: : | Semiconductor Physics Quantum Electronics & Optoelectronics |
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| Дата: | 2011 |
| Автори: | , , , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України
2011
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| Онлайн доступ: | https://nasplib.isofts.kiev.ua/handle/123456789/117724 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal / V.E. Vovk, O.V. Kovalchuk, M.P. Gorishnyj, T.M. Kovalchuk // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2011. — Т. 14, № 2. — С. 256-260. — Бібліогр.: 10 назв. — англ. |
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Vovk, V.E. Kovalchuk, O.V. Gorishnyj, M.P. Kovalchuk, T.M. 2017-05-26T13:11:46Z 2017-05-26T13:11:46Z 2011 Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal / V.E. Vovk, O.V. Kovalchuk, M.P. Gorishnyj, T.M. Kovalchuk // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2011. — Т. 14, № 2. — С. 256-260. — Бібліогр.: 10 назв. — англ. 1560-8034 PACS 73.61.Wp, 78.66.Tr https://nasplib.isofts.kiev.ua/handle/123456789/117724 Solutions of fullerene molecules С60 with chemically attached molecules of diamine (С60D) in planar oriented nematic liquid crystal (NLC) were obtained by only heating and ultrasonic processing. The С60D concentration changes from 0 up to 3.0 wt.%. Within the ranges of frequencies 10⁻¹ – 10⁶ Hz and temperatures 298-343 K, dielectric properties of solutions were investigated. It was shown that, at frequencies higher than 100 Hz, the frequency dispersion of the components of complex dielectric permittivity is absent. A value of conductivity of the solution was determined. It was also shown that the activation energy for the temperature dependence of the conductivity in nematic and isotropic phases does not depend on the concentration of molecules С60D. Obtained and explained were the reasons of the nonmonotonic conductivity dependence of solutions on the concentration of С60D molecules. For frequencies lower than 100 Hz, the dispersion of the components of complex dielectric permittivity is observed. It was shown that the dispersion can be described by the Debye equation. The temperature dependence of a value inverse to the relaxation time correlates with the temperature dependence of conductivity. Presence of С60D molecules in NLC tends to increasing the voltage for the Frederiksz transition. Made was the assumption that this effect may be explained by increase in viscosity of NLC as a consequence of aggregation of fullerene molecules. This work was supported in part by Projects 1.4.1. В/134. Authors also thank Dr. E.V. Basiuk (GolovatayaDzhymbeeva), Universidad Nacional Autónoma de México for providing the sample of modified fullerene C₆₀ and Dr. A.B. Nych for his help with obtaining the microphotos. en Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України Semiconductor Physics Quantum Electronics & Optoelectronics Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal Article published earlier |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| title |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal |
| spellingShingle |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal Vovk, V.E. Kovalchuk, O.V. Gorishnyj, M.P. Kovalchuk, T.M. |
| title_short |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal |
| title_full |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal |
| title_fullStr |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal |
| title_full_unstemmed |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal |
| title_sort |
dielectric and electro-optical properties of solutions of chemically modified fullerene с60 in nematic liquid crystal |
| author |
Vovk, V.E. Kovalchuk, O.V. Gorishnyj, M.P. Kovalchuk, T.M. |
| author_facet |
Vovk, V.E. Kovalchuk, O.V. Gorishnyj, M.P. Kovalchuk, T.M. |
| publishDate |
2011 |
| language |
English |
| container_title |
Semiconductor Physics Quantum Electronics & Optoelectronics |
| publisher |
Інститут фізики напівпровідників імені В.Є. Лашкарьова НАН України |
| format |
Article |
| description |
Solutions of fullerene molecules С60 with chemically attached molecules of diamine (С60D) in planar oriented nematic liquid crystal (NLC) were obtained by only heating and ultrasonic processing. The С60D concentration changes from 0 up to 3.0 wt.%. Within the ranges of frequencies 10⁻¹ – 10⁶ Hz and temperatures 298-343 K, dielectric properties of solutions were investigated. It was shown that, at frequencies higher than 100 Hz, the frequency dispersion of the components of complex dielectric permittivity is absent. A value of conductivity of the solution was determined. It was also shown that the activation energy for the temperature dependence of the conductivity in nematic and isotropic phases does not depend on the concentration of molecules С60D. Obtained and explained were the reasons of the nonmonotonic conductivity dependence of solutions on the concentration of С60D molecules. For frequencies lower than 100 Hz, the dispersion of the components of complex dielectric permittivity is observed. It was shown that the dispersion can be described by the Debye equation. The temperature dependence of a value inverse to the relaxation time correlates with the temperature dependence of conductivity. Presence of С60D molecules in NLC tends to increasing the voltage for the Frederiksz transition. Made was the assumption that this effect may be explained by increase in viscosity of NLC as a consequence of aggregation of fullerene molecules.
|
| issn |
1560-8034 |
| url |
https://nasplib.isofts.kiev.ua/handle/123456789/117724 |
| citation_txt |
Dielectric and electro-optical properties of solutions of chemically modified fullerene С60 in nematic liquid crystal / V.E. Vovk, O.V. Kovalchuk, M.P. Gorishnyj, T.M. Kovalchuk // Semiconductor Physics Quantum Electronics & Optoelectronics. — 2011. — Т. 14, № 2. — С. 256-260. — Бібліогр.: 10 назв. — англ. |
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