Enhancement of the display parameters of 4′-pentyl-4-cyanobiphenyl due to the dispersion of functionalised gold nano particles
| Autor: | Sandeep Kumar, Roman Dabrowski, Abhay S. Pandey, Ravindra Dhar |
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| Rok vydání: | 2011 |
| Předmět: |
Materials science
business.industry Transition temperature Homeotropic alignment Isotropy Analytical chemistry Physics::Optics Nanoparticle General Chemistry Dielectric Condensed Matter Physics Condensed Matter::Materials Science Dark state Optics Liquid crystal General Materials Science Dispersion (chemistry) business |
| Zdroj: | Liquid Crystals. 38:115-120 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678292.2010.530695 |
| Popis: | We report electro-optical and dielectric studies of the gold nano particle (GNP) dispersed room-temperature liquid crystalline material 4′-pentyl-4-cyanobiphenyl (5CB) at a concentration of 0.1 wt%. Due to the dispersion of GNPs, the nematic to isotropic transition temperature is significantly increased. The threshold voltage required to switch molecules from the planar orientation (bright state) to the homeotropic (dark state) orientation is decreased. The dielectric parameters, namely, the longitudinal component of the dielectric permittivity and hence the dielectric anisotropy, are highly affected. The relaxation frequency corresponding to flip-flop motion of the 5CB molecules about their short axes has increased due to the presence of GNPs. |
| Databáze: | OpenAIRE |
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