Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

Hexylcyanobiphenyl liquid crystal was doped with graphene oxide at ratios %0.25GO, %0.5GO, %1GO and %2GO, and the change in physical properties of pristine and the doped liquid crystals has been investigated. The phase transitions of prepared samples were studied by differential scanning calorimeter...

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Bibliographic Details
Published in:Journal of theoretical and applied physics 2018-09, Vol.12 (3), p.169-176
Main Authors: Özgan, Şükrü, Eskalen, Hasan, Tapkıranlı, Yusuf
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Atomic
Condensed Matter Physics
Dispersion
Electrical properties
Electrical resistivity
Graphene
Impedance
Light transmittance
Liquid crystals
Liquid phases
Medical and Radiation Physics
Microscopy
Molecular
Nanoscale Science and Technology
Optical and Plasma Physics
Optical microscopy
Phase transitions
Physical properties
Physics
Physics and Astronomy
Temperature
Thermal stability
Threshold voltage
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Summary:Hexylcyanobiphenyl liquid crystal was doped with graphene oxide at ratios %0.25GO, %0.5GO, %1GO and %2GO, and the change in physical properties of pristine and the doped liquid crystals has been investigated. The phase transitions of prepared samples were studied by differential scanning calorimeter and polarized optical microscopy. The differential scanning calorimeter and polarized optical microscopy results are in good agreement when examining the nematic–isotropic liquid phase transition temperatures of the hexylcyanobiphenyl. The liquid crystal texture images obtained with polarized optical microscopy reveals that thermal stability of sample changed with graphene oxide concentration, i.e., increased with graphene oxide concentration. Impedance, capacitance, conductivity and real and imaginary dielectric constants of the pure and doped liquid crystals were obtained depending on frequency and voltage at the room temperature by using impedance analyzer. These electrical properties of the pure and the graphene oxide-doped samples showed an increase with increasing the graphene oxide ratio. The voltage-dependent light transmittance experiment revealed that threshold voltage of LC cells decreased for %0.25GO- and  % 1GO-dispersed samples, but it was increased at %0.5GO- and %2GO-dispersed samples.
ISSN:2251-7227
2251-7235
DOI:10.1007/s40094-018-0307-y