Dielectric studies of dispersions of zinc oxide nanoparticles in p-ethoxy benzylidene-p-cyano aniline (EBCA) nematic liquid crystals

The Nonvolatile memory effect based on ZnO nanomaterials doped p-ethoxy benzylidene-p-cyano aniline (EBCA) nematic liquid crystals has been observed. The memory effect has been analyzed by polarizing optical microscopy and dielectric spectroscopy. This experiments have reported that ZnO nanoparticle...

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Bibliographic Details
Main Authors: Raju, K. V. Surya Narayana, Babu, Shaik, Begum, S. Salma
Format: Conference Proceeding
Language:English
Subjects:
Aniline
Dielectric loss
Dielectric relaxation
Display devices
Liquid crystals
Nanomaterials
Nanoparticles
Nematic crystals
Optical microscopy
Power consumption
Relaxation time
Statistical mechanics
Zinc oxide
Zinc oxides
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Summary:The Nonvolatile memory effect based on ZnO nanomaterials doped p-ethoxy benzylidene-p-cyano aniline (EBCA) nematic liquid crystals has been observed. The memory effect has been analyzed by polarizing optical microscopy and dielectric spectroscopy. This experiments have reported that ZnO nanoparticles have drastic effects on nematic liquid crystals increasing the isotropic nematic transistion temperature by about 10K. To understanding these effects we develop a theory for the statistical mechanics of ZnO nanoparticles in liquid crystals. Detailed studies of the dielectric parameters as a function of frequency (1Hz to 1 KHz) with temperature range (40°C - 130°C) were carried out. It was found that as ZnO concentration in NLC, the value of dielectric permittivity decreases. The dielectric loss and relaxation time have also measured in the nematic phase. Decrease in relaxation time in nanodispersed EBCA suggests the low switching times and power consumption of display devices. This is most wanting feature in the present green technology.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.5047976