New Aspect of the Voltage/Confinement Ratio Phase Diagram for a Confined Homeotropic Cholesteric
| Autor: | J. M. Gilli, D. Manaila-Maximean, Stephan Y. Thiberge |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
Materials science
Dopant Condensed matter physics Homeotropic alignment General Chemistry Condensed Matter Physics Topological defect Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter MBBA Dipole Crystallography chemistry.chemical_compound chemistry Liquid crystal General Materials Science SPHERES Phase diagram |
| Zdroj: | Molecular Crystals and Liquid Crystals. 417:207-213 |
| ISSN: | 1563-5287 1542-1406 |
| Popis: | We have investigated the behavior of a cholesteric mixture, consisting of the negative dielectric anisotropy liquid crystal MBBA and a chiral dopant S811(1%b.w.). In the phase diagram a.c. applied voltage versus confinement ratio, in addition to the transition previously observed, before reaching the domain of the transition TIC(Translationnary Invariant Cholesteric)–modulated TIC, we have observed a new stability domain for the topological bubble. These bubbles are now surrounded by the TIC domains and necessarily associated to an hyperbolic − 1 defect of the in plane director component.We have also obtained experimentally topological defect chains, formed by topological dipoles similar to the ones formed in 2 compound materials: liquid crystal/solid spheres or liquid crystal/liquid droplets. |
| Databáze: | OpenAIRE |
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