The determination of the phase transition temperatures of a semifluorinated liquid crystalline biphenyl ester by impedance spectroscopy as an alternative method

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

Physica B: Condensed Matter, cilt.503, ss.152-156, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 503
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.physb.2016.10.001
  • Dergi Adı: Physica B: Condensed Matter
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.152-156
  • Anahtar Kelimeler: Differential scanning calorimetry (DSC), Impedance spectroscopy (IS), Liquid crystal, Phase transition temperature
  • Yıldız Teknik Üniversitesi Adresli: Evet

Özet

© 2016 Elsevier B.V.Dielectric spectroscopy (DS) is a very powerful and important for better understanding of the molecular dynamics and relaxation phenomena in liquid crystals. The dielectric and impedance characteristics Ethyl 4-(7,7,8,8,9,9,10,10,10-nonafluorodecyloxy)biphenyl-4′-carboxylate (ENBC) liquid crystal have been analyzed over the frequency range of 100 Hz to MHz in the temperature region from room temperature to 180 °C. The compound ENBC shows enantiotropic a smectic mesophase in a wide temperature range. The phase transition temperatures T (°C) of the liquid crystal ENBC, which were characterized by Differential Scanning Calorimetry (DSC), have been verified by the dielectric measurements and conductivity mechanisms of the ENBC. The activation energies for some selected angular frequencies have also been calculated.