Impedance spectroscopy and dielectric anisotropy-type analysis in dye-doped nematic liquid crystals having different preliminary orientations
✍ Scribed by Mustafa Okutan; Fahrettin Yakuphanoglu; S. Eren San; Oğuz Koysal
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 776 KB
- Volume
- 368
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
Reorientation tendencies of liquid crystal (LC) molecules are investigated for two different fundamental orientation configurations known as homogeneous (HG) and homeotropic (HT). Dielectric anisotropy properties of a HT sample and a HG one are investigated as a function of frequency. The dielectric anisotropy changes from the positive type to the negative type. The obtained results suggest that the samples exhibit dielectrically controlled positive dielectric anisotropy (p-type De) with a critical frequency transition to negative dielectric anisotropy (n-type De) behavior. The high-frequency relaxation process exhibits non-Debye-type behavior due to dipolar rotation around the long molecular axis. The orientation configurations (HG and HT) change the dielectric anisotropy properties of the LC in a favorable manner.