Orientational instability of nematic liquid crystal in a homeotropic cell with boundary conditions controlled by an electric field
| Autor: | M. F. Ledney, A. I. Lesiuk, O. S. Tarnavskyy |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Permittivity
Materials science Field (physics) Condensed matter physics 010405 organic chemistry Fréedericksz transition Homeotropic alignment 02 engineering and technology General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Condensed Matter::Soft Condensed Matter Magnetic anisotropy Liquid crystal Electric field General Materials Science 0210 nano-technology Anisotropy |
| Zdroj: | Liquid Crystals. 46:469-483 |
| ISSN: | 1366-5855 0267-8292 |
| DOI: | 10.1080/02678292.2018.1508769 |
| Popis: | We study the orientational instability of the director in a homeotropic nematic liquid crystal (NLC) cell in a DC electric field. The electric field is applied along or perpendicular to a cell surface depending on whether anisotropy of dielectric permittivity of NLC is positive or negative. The easy axis on one of the cell polymer substrates is allowed to deviate in perpendicular to the substrate plane due to the influence of the NLC and the electric field. It was established that the orientational instability of the director can have a threshold as well as be thresholdless which depends on the character of the coupling of the easy axis with the electric field. The temporal behaviour of a director and the easy axis during transition to the stationary state after turning on electric field and returning to the initial homogeneous state after turning off the field was investigated. In the case of the negative anisotropy of the static permittivity, the comparison of experimental and calculated time de... |
| Databáze: | OpenAIRE |
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