Dielectric Relaxation in Phase-Segregated Mixtures of Polystyrene and Liquid Crystal 5CB

2004 ◽  
Vol 37 (4) ◽  
pp. 1583-1590 ◽  
Author(s):  
Hironobu Hori ◽  
Osamu Urakawa ◽  
Keiichiro Adachi
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Liquid Crystal 5Cb

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 in Liquid Crystal Phases with Polar Order

2003 ◽  
Vol 297 (1) ◽  
pp. 91-105
Author(s):  
B. Żywucki ◽  
W. Kuczyński ◽  
J. Małecki
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Polar Order ◽  
Crystal Phases ◽  
Liquid Crystal Phases

Polar Anchoring Strength and the Temperature Dependence of Nematic Liquid Crystal (5CB) Aligned on Rubbed Polystyrene Films

1992 ◽  
Vol 31 (Part 1, No. 7) ◽  
pp. 2165-2169 ◽  
Author(s):  
Dae-Shik Seo ◽  
Koh-ichi Muroi ◽  
Toh-ru Isogami ◽  
Hideaki Matsuda ◽  
Shunsuke Kobayashi
Keyword(s):  
Liquid Crystal ◽  
Temperature Dependence ◽  
Nematic Liquid Crystal ◽  
Anchoring Strength ◽  
Liquid Crystal 5Cb

EFFECT OF CELL THICKNESS ON THE DIELECTRIC RELAXATION PROCESSES IN FERROELECTRIC LIQUID CRYSTALS

2008 ◽  
Vol 22 (14) ◽  
pp. 2263-2273 ◽  
Author(s):  
RAJBIR SINGH ◽  
K. K. RAINA
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Dielectric Strength ◽  
Relaxation Processes ◽  
Goldstone Mode ◽  
Ferroelectric Liquid Crystal ◽  
Dielectric Relaxation Spectroscopy ◽  
Dielectric Parameters ◽  
Liquid Crystal Material ◽  
Cell Thickness

Dielectric relaxation spectroscopy in the frequency range 50 Hz to 1 MHz has been carried out in a room temperature ferroelectric liquid crystal mixture in the SmC*, SmA and N* phases in cells of different thickness. The relaxation frequency fr, distribution parameter α and dielectric strength δ∊ have been evaluated. Goldstone mode, domain mode and soft mode have been observed. It is found that the cell thickness has a significant effect on the dielectric parameters of the ferroelectric liquid crystal material. The results have been discussed.

Investigation of dielectric relaxation phenomena in liquid crystal monolayer at the air–water interface

1998 ◽  
Vol 327-329 ◽  
pp. 232-235 ◽  
Author(s):  
Yutaka Majima ◽  
Yoko Sato ◽  
Chen-Xu Wu ◽  
Mitsumasa Iwamoto
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Phenomena ◽  
Water Interface ◽  
Air Water Interface
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