The dielectric parameters of a pyridine-based calamitic liquid crystal

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

MATERIALS RESEARCH EXPRESS, cilt.6, sa.11, 2019 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 6 Sayı: 11
  • Basım Tarihi: 2019
  • Doi Numarası: 10.1088/2053-1591/ab4be1
  • Dergi Adı: MATERIALS RESEARCH EXPRESS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: liquid crystal, impedance spectroscopy (IS), dielectric properties (DS), Cole-Cole plot, ESTER, AZOBENZENE, MESOGENS
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

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.