AJP Fizika E
Institute of Physics
Ministry of Science and Education
Republic of Azerbaijan
ISSN 1028-8546
Azerbaijan Journal of Physics
Published from 1995. Registration number: 514, 20 02 1995
Ministry of Press and Information of Azerbaijan Republic
2021 02 en p.24-28 | T.D. Ibragimov, A.R. Imamaliyev, G.F. Ganizade, O.A. Aliyev, Influence of single-walled carbon nanotubes on dielectric and conductivity properties of smectic A liquid crystal with negative dielectric anisotropy |
ABSTRACT It was experimentally obtained that the presence of single-walled carbon nanotubes with concentration of 0.5% in the smectic liquid crystal with negative dielectric anisotropy reduces the transition temperature from the smectic to isotropic state. Both the longitudinal and transverse components of dielectric permittivity and the dielectric anisotropy are shown to increase in the presence of nanotubes. At the same time, the resulting percolation effect contributes to the increase in conductivity. Keywords: liquid crystal, single-walled carbon nanotubes, dielectric relaxation, electric conductivity, threshold voltage. PACS: 64.70.mj;64.70.pv;77.84.Nh;82.70.Dd. DOI:- Received: 06.05.2021 AUTHORS & AFFILIATIONS Institute of Physics, Azerbaijan National Academy of Sciences, 131 H.Javid Avenue, Baku, AZ 1143, Azerbaijan E-mail: tdibragimov@mail.ru |
REFERENCIES [1] S.V.Burylov, Yu.L. Raikher. Phys. Rev. E 1994, 50, 358-367. [2] N.R. Jber, A.A. Rashad, M.S. Shihab. J. of Molecular Structure 2013, 1043, 28–36. [3] D. Singh, U. Bahadur, S.M. Bhushan, R.Dabrowski, R. Dhar. Materials Letters. 2018, 216, 5-7. [4] M.D. Lynch, D.L. Patrick. Nano Lett., 2002, 2(11), 1197–1201. [5] K.A. Park, S.M. Lee, S.H. Lee, Y.H. Lee. J. Phys. Chem. C 2007, 111, 1620-1624. [6] S.P. Yadav, S. Singh. Progress in Materials Science 2016, 80, 38-76. [7] L. Dolgov, S. Tomylko, O. Koval’chuk, N.Lebovka, O. Yaroshchuk. Liquid Crystal Dispersions of Carbon Nanotubes: Dielectric, Electro-Optical and Structural Peculiarities. In Carbon Nanotubes; Marulanda, J.M., Ed.; Intech: Rijeka, Croatia, 2010; pp. 451-484. [8] D. Singh, U.B. Singh, M.B. Pandey, R.Dabrowski, R. Dhar. Optical Materials 2018, 84, 16-21. [9] D. Singh, U.B. Singh, M.B. Pandey,R. Dhar. Dielectric and Electro-Optic Behaviour of Nematic-SWCNT Nanocomposites under Applied Bias Field. Liquid Crystals 2019, 46, 1389-1395. [10] R. Verma, M. Mishra, R. Dhar, R.Dabrowski. Enhancement of Electrical Conductivity, Director Relaxation Frequency and Slope of Electro-Optical Characteristics in the Composites of Single-Walled Carbon Nanotubes and a Strongly Polar Nematic Liquid Crystal. Liquid Crystals 2017, 44, 544-556. [11] R. Verma, M. Mishra, R. Dharb, R.Dabrowskis. Single Walled Carbon Nanotubes Persuaded Optimization of the Display Parameters of a Room Temperature Liquid Crystal 4-pentyl-4′cyanobiphenyl. Journal of Molecular Liquids 2016, 221, 190-196. [12] T.Vimal, S. Pandey, S.K. Gupta, D.P. Singh, R. Manohar. Journal of Molecular Liquids 2015, 204, 21-26. [13] R. Yamaguchi. Cholesteric Liquid Crystal–Carbon Nanotube composites with Photo-Settable Reversible and Memory Electro-Optic Modes. Applied Optics 2013, 52, E53-E59. [14] O. Köysal. Conductivity and Dielectric Properties of Cholesteric Liquid Crystal Doped with Single Wall Carbon Nanotube. Synthetic Metals 2010, 160, 1097-1100. [15] N. Sood, S. Khosla, D. Singh, S.S. Bawa. Dielectric Investigations of Pure and Carbon Nanotube-Doped Deformed Helix Ferroelectric Liquid Crystals 2012, 39, 1169-1174. [16] F.V. Podgornov, A.M. Suvorova, A.V.Lapanik, W. Haase. Chem. Phys. Lett. 2009, 479, 206-210, [17] S.K. Kumar, A.K. Srivastava, R. Manohar. R. Modification in Dielectric Properties of SWCNT Doped Ferroelectric Liquid Crystals. J. of Non-Crystalline Solids 2011, 357, 1822-1826. [18] G.V. Varshini, D.S. Shankar Rao, P.K.Mukherjee, S.K. Prasad. Nanophase Segregation of Nanostructures: Induction of Smectic A and Re-Entrance in a Carbon Nanotube/Nematic Liquid Crystal Composite. J.Phys. Chem. B 2018, 122, 10774-10781. [19] V.V. Ponevchinsky, A.I. Goncharuk, V.I.Vasil’ev, N.I. Lebovka, M.S. Soskin. Cluster Self-Organization of Nanotubes in a Nematic Phase: the Percolation Behavior and Appearance of Optical Singularities. JETP Letters 2010, 91, 239–242. [20] W. Maier, G. Meier. Eine Einfache Theorie der Dielektrischen Eigenschaften Homogen Orientierter Kristallinflüssiger Phasen des Nematischen Typs. J. Z. Naturforsch A, 1961, 16, 262–267. |