Molecular dynamics in the nematic, S_A and S_C phases of 8S5 and 9S5 as studied by dielectric methods

J. Chruściel Institute of Chemistry, Agricultural and Pedagogical University, 08-110, Siedlce, Poland

B. Gestblom Department of Physics, University of Uppsala, Box 530, S-751 21, Uppsala, Sweden

M. Makrenek Holy Cross University of Technology, Department of Physics, 25-342, Kielce, Poland

W. Haase TH Darmstadt, Institut für Physikalische Chemie, Petersenstr. 20, Germany

M. Pfeiffer TH Darmstadt, Institut für Physikalische Chemie, Petersenstr. 20, Germany

S. Wróbel Institute of Physics, Jagellonian University, 30-059, Kraków, Poland

Abstract

Two experimental techniques—time domain spectroscopy (TDS) and a steady state frequency method—have been used to study dielectric spectra for the isotropic, nematic, S_A, S_C and S_Y phases of two thioesters (4-n-pentylphenyl-4′-n-octyloxy-and 4′-n-nonyloxythiobenzoates (C_nH_2n+1 O‒C₆ H₄‒COS‒C₆H₄‒C₅H₁₁, where n = 8 and n = 9) known as 8S5 and 9S5, in the frequency range from 10 Hz to 10 GHz. In the case of 8S5 a deuteriated sample (8S5-d ₂₈) has been used to study relaxation processes in the nematic and smectic phases.

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Molecular dynamics in the nematic, S_A and S_C phases of 8S5 and 9S5 as studied by dielectric methods

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Molecular dynamics in the nematic, SA and SC phases of 8S5 and 9S5 as studied by dielectric methods

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Molecular dynamics in the nematic, S_A and S_C phases of 8S5 and 9S5 as studied by dielectric methods