Influence of low concentration silver nanoparticles on the electrical and electro-optical parameters of nematic liquid crystals
| Autor: | Roman Dabrowski, M. B. Pandey, Ravindra Dhar, U. B. Singh |
|---|---|
| Rok vydání: | 2013 |
| Předmět: |
Permittivity
Materials science Dielectric strength business.industry Doping Physics::Optics General Chemistry Dielectric Condensed Matter Physics Silver nanoparticle Condensed Matter::Materials Science Dark state Optics Liquid crystal Phase (matter) General Materials Science Composite material business |
| Zdroj: | Liquid Crystals. 40:774-782 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678292.2013.783136 |
| Popis: | Thermodynamical, optical, dielectric and electro-optical characterisation of nematic liquid crystals (LCs) and silver nanoparticle (NP) composites have been carried out. Transition temperatures of pure and composites systems have been measured. Thermodynamical studies suggest increase of clearing temperature of the composite material as compared to the pure material. Threshold voltage for switching from bright to dark state and splay elastic constant of the pure and composite materials have been determined. From frequency dependence of dielectric measurements, permittivity, loss, relaxation frequency and dielectric strength of flip-flop mechanism of LC molecules in the nematic phase have been calculated. Dielectric properties of composites have been explained in reference of Maier and Meier theory. The effects of doping of NPs on dielectric and electro-optic properties of LC-NP composites have been discussed. |
| Databáze: | OpenAIRE |
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