Dielectric Relaxation Studies of 5PCH by the Time Domain Spectroscopy Method
Open Access
- 1 June 1995
- journal article
- Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung A
- Vol. 50 (6) , 595-600
- https://doi.org/10.1515/zna-1995-0612
Abstract
The time domain spectroscopy (TDS) method has been used for the measurement of the complex dielectric permittivity in the isotropic phase and for perpendicular and parallel orientations in the nematic phase of 5PCH (4-(trans-4-pentyl-cyclohexyl)-benzonitrile). The accessible frequencies range from ca 15 MHz to ca. 1.5 GHz. The obtained spectra are well consistent with the spectra measured recently in the frequency domain (T. Brückert et al., Mol. Cryst. Liq. Cryst., in press). From the relaxation times τ‖, τ⊥and τis we have calculated the activation enthalpies and the retardation factors g|| and g⊥ that allow to obtain the nematic potential q. The validity of some assump tions of the mean-field theories of the nematic state are discussed.Keywords
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