The dielectric parameters of a pyridine-based calamitic liquid crystal

Karanlık G., Ocak H., Canli N., Okutan M., Eran B.

MATERIALS RESEARCH EXPRESS, vol.6, no.11, 2019 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 6 Issue: 11
  • Publication Date: 2019
  • Doi Number: 10.1088/2053-1591/ab4be1
  • Journal Name: MATERIALS RESEARCH EXPRESS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Keywords: liquid crystal, impedance spectroscopy (IS), dielectric properties (DS), Cole-Cole plot, ESTER, AZOBENZENE, MESOGENS
  • Yıldız Technical University Affiliated: Yes

Abstract

In this research, a new pyridine-based calamitic compound Methyl 5-(4-(S)-3,7-dimethyloctyloxyphenyl)pyridine-2-carboxylate (MDPC) was synthesized and the mesomorphic properties was investigated by traditional method. The dielectric parameters of MDPC showing an enantiotropic smectic A phase have also been evaluated from 44 degrees C to 100 degrees C and from 1 kHz to 2 MHz. The dielectric parameters (absorption coefficient, relaxation time and dielectric strength) have been determined by Origin Lab 8.5. This material can be used in super capacitors between 65 degrees C-95 degrees C. Furthermore, it has been found that the conductivity mechanism of the MDPC exhibits from 44 degrees C to 60 degrees C Quantum Tunneling Model (QMT) and after 60 degrees C exhibits DC conductivity mechanism and QMT mechanisms in low and high angular frequency region, respectively.