Debye type dielectric relaxation in carbon nano-balls' and 4-DMAABCA acid doped E7 coded nematic liquid crystal

Senturk E., Okutan M., San S. E., Koysal O.

Journal of Non-Crystalline Solids, cilt.354, sa.30, ss.3525-3528, 2008 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Derleme
  • Cilt numarası: 354 Sayı: 30
  • Basım Tarihi: 2008
  • Doi Numarası: 10.1016/j.jnoncrysol.2008.03.044
  • Dergi Adı: Journal of Non-Crystalline Solids
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.3525-3528
  • Anahtar Kelimeler: Dielectric properties, relaxation, electric modulus, Liquid crystals and molecular liquids
  • Yıldız Teknik Üniversitesi Adresli: Hayır

Özet

The electrical properties of carbon nano-balls' and 4-dimethylaminoazobenzene-2′-carboxylic acid doped dispersed nematic liquid crystal composite were investigated by impedance spectroscopy technique. The conductivity and capacitance were measured in the frequency range 100 kHz-1 MHz and temperature range 300-380 K. The loss peak was observed in the dielectric loss spectra and was identified as nearly-Debye type relaxation. Cole-Cole plots have been used to describe the characteristic changes of electrical properties in mentioned temperature interval. The sample presents monodispersive relaxation behavior with a relaxation time of ∼10-7 s. The relaxation process is attributed to the dipolar rotation of the long molecular axis and the activation energy is found to be 0.097 eV. © 2008 Elsevier B.V. All rights reserved.