Linear and non-linear dielectric properties of a short-pitch ferroelectric liquid crystal stabilized by a polymer network
| Autor: | C. Legrand, Y. Cherfi, M. Ismaili, Redouane Douali, N. Beldjoudi, J. Hemine, J. M. Leblond, A. Daoudi |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Polymers Biophysics Dielectric Molecular Dynamics Simulation Ferric Compounds Condensed Matter::Materials Science Liquid crystal Rotational viscosity General Materials Science Soft matter Composite material Quantitative Biology::Biomolecules Dielectric strength Viscosity Electric Conductivity Temperature Elastic energy Surfaces and Interfaces General Chemistry Ferroelectricity Elasticity Liquid Crystals Dielectric spectroscopy Condensed Matter::Soft Condensed Matter Microscopy Polarization Algorithms Biotechnology |
| Zdroj: | The European Physical Journal E. 33:335-342 |
| ISSN: | 1292-895X 1292-8941 |
| DOI: | 10.1140/epje/i2010-10679-x |
| Popis: | Linear and non-linear dielectric measurements were carried out on a ferroelectric liquid crystal stabilized by an anisotropic polymer network. The polymerization process was achieved at room temperature. It was performed from an achiral monomer in the ferroelectric chiral smectic C phase, exhibiting a very short helical pitch and a large polarization. The linear and non-linear dielectric spectroscopy were also completed by textural morphology as well as structural and ferroelectric characterizations. All these measurements were carried out on a pure ferroelectric liquid crystal material and on composite films containing two polymer concentrations. The increase of the polymer network density leads to a decrease of the dielectric strength determined in the linear and non-linear dielectric spectroscopy. The complementarity between the linear and non-linear dielectric measurements and their confrontation with a theoretical model allowed the simultaneous determination of some physical parameters such as macroscopic polarization, rotational viscosity and twist elastic energy. We also discuss the effect of the polymer network density on the obtained physical parameters. |
| Databáze: | OpenAIRE |
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