Anisotropy of Static Electric Permittivity and Conductivity in Some Nematics and Smectics A
- 1 April 1987
- journal article
- liquid crystals
- Published by Taylor & Francis in Molecular Crystals and Liquid Crystals
- Vol. 145 (1), 17-23
- https://doi.org/10.1080/00268948708080210
Abstract
Anisotropy of static electric permittivity and conductivity was measured for three groups of liquid crystals: (I) p-n-alkyl-p'-cyanobiphenyls (CnH2n+1-φ-φ-CN, n = 5,6,7,8), (II) p-p'-dialkylazoxybenzenes (CnH2n+1-φ-N(O) = N-φ-CnH2n+1, n = 5,6,7,8) and (III) p-alkyloxyphenyl-p'-alkoxybenzoates (CnH2n+1-O-φ-COO-φ-O-CmH2m+1, n = 8, m = 5; n = 8, m = 7; n = 10, m = 5; n = 11, m = 5). The nematic-smectic A phase transition for compounds of the I and II group manifests itself as a change of conductivity anisotropy sign due to a strong variation of the parallel component σ∥ only; for compounds of the III group both components of electric conductivity and permittivity change considerably.Keywords
This publication has 14 references indexed in Scilit:
- Dielectric study of the liquid crystal compound octylcyanobiphenyl (8CB) using time domain spectroscopyJournal de Physique, 1984
- Propriétés diélectriques à large bande de fréquences du 4 cyano 4' octylbiphényl en phases smectique, nématique et liquideJournal de Physique, 1977
- Dielectric and optical studies of a nematogen (4,4-n-heptyl-cyanobiphenyl)Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics, 1976
- Pretransitional behavior of conductivity and dielectric properties above a smectic C–nematic transition in 4-4′-di(n-alkyloxy)azoxybenzenesThe Journal of Chemical Physics, 1975
- Influence of smectic order on the static dielectric permittivity of liquid crystalsThe Journal of Chemical Physics, 1974
- Dielectric Properties of Di--Heptyl Azoxybenzene in the Nematic and in the Smectic-PhasesPhysical Review Letters, 1974
- Quasielastic Neutron Scattering to Determine Self-Diffusion Constants in Liquid p-AzoxyanisolMolecular Crystals and Liquid Crystals, 1974
- Self-diffusion of nematic liquid crystals in the isotropic phase near the nematic-isotropic transitionPhysics Letters A, 1973
- Conductance measurements above a smectic-C ⇹ nematic transitionSolid State Communications, 1972
- Anisotropic Mass Diffusion in Liquid CrystalsMolecular Crystals and Liquid Crystals, 1970