Low frequency dielectric relaxation and optical behaviour of a nematic liquid crystal 4-methyl (2ʹ-hydroxy, 4ʹ-N-hexadecyloxy) azobenzene

2013 ◽  
Author(s):  
Pankaj Kr Tripathi ◽  
Abhishek Kr Misra ◽  
Shivani Pandey ◽  
Rajiv Manohar
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Nematic Liquid Crystal ◽  
Low Frequency ◽  
Optical Behaviour

Dielectric Relaxation Studies of Silver Nanoparticles dispersed Liquid Crystal

2015 ◽  
Vol 8 (3) ◽  
pp. 2176-2188 ◽  
Author(s):  
Keisham Nanao Singh
Keyword(s):  
Activation Energy ◽  
Silver Nanoparticles ◽  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Process ◽  
Relaxation Times ◽  
Low Frequency ◽  
Bulk Liquid ◽  
Molecular Rearrangement ◽  
Relaxation Studies

This article reports on the Dielectric Relaxation Studies of two Liquid Crystalline compounds - 7O.4 and 7O.6 - doped with dodecanethiol capped Silver Nanoparticles. The liquid crystal molecules are aligned homeotropically using CTAB. The low frequency relaxation process occurring above 1 MHz is fitted to Cole-Cole formula using the software Dielectric Spectra fit. The effect of the Silver Nanoparticles on the molecular dipole dynamics are discussed in terms of the fitted relaxation times, Cole-Cole distribution parameter and activation energy. The study indicate a local molecular rearrangement of the liquid crystal molecules without affecting the order of the bulk liquid crystal molecules but these local molecules surrounding the Silver Nanoparticles do not contribute to the relaxation process in the studied frequency range. The observed effect on activation energy suggests a change in interaction between the nanoparticles/liquid crystal molecules.

Dielectric Relaxation and Optical Transmittance of PVC Membranes Modified by Nematic Liquid Crystal

2009 ◽  
Vol 58 (11) ◽  
pp. 588-603
Author(s):  
P. Simeao Carvalho ◽  
F. Figueiras ◽  
S. Mendonca ◽  
C. M. Pereira ◽  
M. Rodrigues
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Nematic Liquid Crystal ◽  
Optical Transmittance ◽  
Pvc Membranes

Anomalously high dielectric strength and low frequency dielectric relaxation of a bent-core liquid crystal with a large kink angle

2017 ◽  
Vol 17 (6) ◽  
pp. 858-863 ◽  
Author(s):  
Anoop Kumar Srivastava ◽  
Jongyoon Kim ◽  
Sunggu Yeo ◽  
Jinyoung Jeong ◽  
E-Joon Choi ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Low Frequency ◽  
Dielectric Strength ◽  
Kink Angle ◽  
High Dielectric
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