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Zeitschrift für Naturforschung A

A Journal of Physical Sciences

Editor-in-Chief: Holthaus, Martin

Editorial Board: Fetecau, Corina / Kiefer, Claus

12 Issues per year


IMPACT FACTOR 2016: 1.432

CiteScore 2017: 1.30

SCImago Journal Rank (SJR) 2017: 0.403
Source Normalized Impact per Paper (SNIP) 2017: 0.632

Online
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1865-7109
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Volume 53, Issue 3-4

Issues

Dielectric Studies of a Substance with Negative Dielectric Anisotropy

S. Urban / B. Gestblom / R. Dąbrowski / H. Kresse
Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/zna-1998-3-406

Abstract

The results of dielectric studies of 6BAP(F) (1-[4-(hexylbicyclo[2,2,2]octyl]-2-(3-fluoro-4-methoxy-phenyl)ethane) in the nematic and isotropic phases are presented. The substance has a negative dielectric anisotropy. By applying two experimental techniques, using a network analyzer and time domain spectrometer (TDS), the two main relaxation processes, connected with the molecular reorientation around the short and long axes, respectively, were resolved in the phases studied. The activation barriers hindering the motions were obtained. By extrapolation of the longitudinal and transverse relaxation times from the isotropic to the nematic phase the retardation factors, gand g, and the nematic potential versus temperature could be calculated. These are discussed together with the order parameter S obtained from the refractive index, and are compared with the predictions of the mean-field theories.

Keywords: Liquid Crystals; Dielectric Anisotropy; Dielectric Relaxation; Retardation Factors

About the article

Received: 1998-02-20

Published Online: 2014-06-02

Published in Print: 1998-04-01


Citation Information: Zeitschrift für Naturforschung A, Volume 53, Issue 3-4, Pages 134–140, ISSN (Online) 1865-7109, ISSN (Print) 0932-0784, DOI: https://doi.org/10.1515/zna-1998-3-406.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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