Dielectric and viscous properties of 6CHBT in the isotropic and nematic phases

Autor:	Christian Legrand, Jan Jadżyn, Redouane Douali, Grzegorz Czechowski, Louis Hellemans
Rok vydání:	2000
Předmět:	Dipole Viscosity Materials science Biaxial nematic Condensed matter physics Liquid crystal Phase (matter) Isotropy Moment (physics) General Materials Science General Chemistry Dielectric Condensed Matter Physics
Zdroj:	Liquid Crystals. 27:613-619
ISSN:	1366-5855 0267-8292
Popis:	This paper presents the results of measurements of the principal electric permittivities ∊ ∥*(T, ω and ∊⊥*(T, ω) and the viscosity for 4-(trans-4-n-hexylcyclohexyl)isothiocyanatobenzene (C6H13-CyHx-Bz-N=C=S, 6CHBT). In the nematic phase, the Miesowicz η2 viscosity coefficient was measured in a sample oriented due to the flow. On the basis of the temperature dependence of the static permittivities, using the Maier-Meier equations, the angle β between the dipole moment vector and the long axis of the 6CHBT molecule, the square of the molecular apparent dipole moment μ2 app 2 and the nematic order parameter S(T), were determined. From the temperature dependence of the viscosity and the relaxation time corresponding to the molecular rotation around the short axis, the strength of the nematic potential and the effective length of the 6CHBT molecule (in the isotropic phase) were estimated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::045c92890aa3e30b3c154500c287849e https://doi.org/10.1080/026782900202453 Zobrazit plný text záznamu