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Quasicritical behavior of the low-frequency dielectric permittivity in the isotropic phase of liquid crystalline materials

Aleksandra Drozd-Rzoska1, Sylwester J. Rzoska1, Jerzy Zioło1, and Jan Jadżyn2

  • 1“August Chełkowski” Institute of Physics, Silesian University, ul. Uniwersytecka 4, 40-007 Katowice, Poland
  • 2Institute of Molecular Physics, Polish Academy of Sciences, ul. Smoluchowskiego 17, 60-179 Poznań, Poland

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Phys. Rev. E 63, 052701 – Published 13 April, 2001

DOI: https://doi.org/10.1103/PhysRevE.63.052701

Abstract

Results presented give evidence of the existence of quasicritical, fluidlike behavior in the isotropic phase of 4-cyano-4-pentyl-biphenyl (5CB) for frequencies ranging from the static to the ionic-dominated [low-frequency (LF)] region. Despite the boost of dielectric permittivity on lowering the frequency below 1 kHz, values of the isotropic-nematic transition discontinuity (≈1.1 K) and the critical exponent α (≈0.5) remain constant. It is shown that the contribution from residual ionic impurities is a linear function of temperature in the critical, prenematic fluctuation-dominated region. The validity of the fluidlike and critical behavior for LF dielectric permittivity confirmed results of a derivative analysis of the experimental data: dɛ/dT∝(T−T*)−α, originally proposed for critical mixtures. Results of a preliminary test in the isotropic phase of 4−decyl−4′-isothiocyanatobiphenyl (10BT), on approaching the smectic-E phase, may indicate a general validity of results obtained.

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Phys. Rev. E 63, 052701– Published 13 April, 2001
  • Received 18 October 2000

© 2001 American Physical Society

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