Electro-optical effects of organic N-benzyl-2-methyl-4-nitroaniline dispersion in nematic liquid crystals
| Autor: | Brahadeeswaran Srinivasan, Che Ju Hsu, Karthick Subramani, Pravinraj Selvaraj, Chi Yen Huang |
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| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Permittivity Multidisciplinary Materials science Dopant Liquid crystals lcsh:R Analytical chemistry lcsh:Medicine Article 03 medical and health sciences Dipole 030104 developmental biology 0302 clinical medicine Displays Liquid crystal Polarizability Rotational viscosity Electric field lcsh:Q lcsh:Science Anisotropy 030217 neurology & neurosurgery |
| Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-11 (2020) Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | The dispersion of organic N-benzyl-2-methyl-4-nitroaniline (BNA) in nematic liquid crystals (LCs) is studied. BNA doping decreases the threshold voltage of cell because of the reduced splay elastic constant and increased dielectric anisotropy of the LC mixture. When operated in the high voltage difference condition, the BNA-doped LC cell has a fall time that is five times faster than that of the pure one because of the decrements in the threshold voltage of the cell and rotational viscosity of the LC mixture. The additional restoring force induced by the BNA’s spontaneous polarization electric field (SPEF) also assists to decrease the fall time of the LC cell. The decreased viscosity can be deduced from the decrements in phase transition temperature and associated order parameter of the LC mixture. Density functional theory calculation demonstrates that the BNA dopant strengthens the absorbance for blue light, enhances the molecular interaction energy and dipole moment, decreases the molecular energy gap, and thus increases the permittivity of the LC mixture. The calculation also shows that the increased dipole moment, polarizability, and polarizability anisotropy increase the dielectric anisotropy of the LC mixture, which agrees with the experimental results well. BNA doping has a promising application to the fields of LC devices and displays. |
| Databáze: | OpenAIRE |
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