Dielectric relaxation studies in 5CB nematic liquid crystal at 9 GHz under the influence of external magnetic field using microwave cavity spectrometer

Pramana ◽  
2011 ◽  
Vol 76 (4) ◽  
pp. 621-628 ◽  
Author(s):  
MANOJ JOHRI ◽  
ABHAY SAXENA ◽  
S JOHRI ◽  
S SAXENA ◽  
D P SINGH
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
External Magnetic Field ◽  
Dielectric Relaxation ◽  
Nematic Liquid Crystal ◽  
Microwave Cavity ◽  
Relaxation Studies

TM modes in a slab waveguide filled with nematic liquid crystal in an external magnetic field

1989 ◽  
Vol 6 (1) ◽  
pp. 126 ◽  
Author(s):  
E. Santamato ◽  
M. Settembre ◽  
M. Romagnoli ◽  
P. Maddalena ◽  
B. Daino
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
External Magnetic Field ◽  
Nematic Liquid Crystal ◽  
Slab Waveguide

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.

Dynamics of a disc in a nematic liquid crystal

Soft Matter ◽  
2016 ◽  
Vol 12 (4) ◽  
pp. 1279-1294 ◽  
Author(s):  
Alena Antipova ◽  
Colin Denniston
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Numerical Simulations ◽  
Nematic Liquid Crystal ◽  
Weak Magnetic Field ◽  
Angular Speed ◽  
The Magnetic Field

We explain the motion of a micron-sized ferromagnetic disc immersed in a nematic liquid crystal under the action of a weak magnetic field using numerical simulations. We show that the disc's behaviour can be controlled by the angular speed of the magnetic field and its magnitude.

Eigenmodes in a photonic structure with a torsion-deformed nematic liquid crystal exposed to a magnetic field

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
Vladimir A. Gunyakov ◽  
Alexander M. Parshin ◽  
Ivan V. Timofeev ◽  
Victor Ya. Zyryanov
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Photonic Structure

Magnetic field effect on the thresholds of a sequence of transitions in the electroconvection of a homeotropic nematic liquid crystal

2002 ◽  
Vol 66 (3) ◽  
Author(s):  
Nándor Éber ◽  
Szilárd Németh ◽  
Axel G. Rossberg ◽  
Lorenz Kramer ◽  
Ágnes Buka
Keyword(s):  
Magnetic Field ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Field Effect ◽  
Magnetic Field Effect
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