FIELD INDUCED STUDIES IN CARBON NANOTUBES DOPED NEMATIC LIQUID CRYSTAL MIXTURE

2014 ◽  
Vol 4 (3) ◽  
pp. 565-570 ◽  
Author(s):  
Praveen Malik
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Optical Responses ◽  
Crystal Mixture ◽  
Current Behavior

Carbon nanotubes (CNTs) doped nematic liquid crystal (NLC) mixture of varying concentrations of CNTs in 0.0, 0.2 and0.5 wt./wt.% ratios have been prepared and studied. The effect of electric field on current behavior and optical propertiesin pure NLC and CNTs-NLC mixtures has been investigated. Dispersion of CNTs in NLC mixture increases the currentnearly 3 times. The lower concentration of CNTs leads to better optical responses

DYNAMIC RESPONSE OF CARBON NANOTUBES DISPERSED IN NEMATIC LIQUID CRYSTAL

NANO ◽  
2007 ◽  
Vol 02 (01) ◽  
pp. 41-49 ◽  
Author(s):  
SANG YOUN JEON ◽  
KYUNG AH PARK ◽  
IN-SU BAIK ◽  
SEOK JIN JEONG ◽  
SEOK HO JEONG ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Electric Field ◽  
Dynamic Response ◽  
Nematic Liquid Crystal ◽  
Density Functional ◽  
Strong Electric Field ◽  
Optical Microscope ◽  
Analysis Of Dynamics ◽  
Vertical Cell

The alignment and dynamic response of carbon nanotubes (CNTs) in nematic liquid crystal (NLC) medium induced by strong electric field have been observed through polarizing optical microscope. Density-functional calculations suggest that LC molecule anchors helically to the CNT wall to enhance π-stacking with a binding energy of nearly -2.0 eV due to a considerable amount of charge transfer from LC molecule to CNT, resulting in the formation of excess charges and permanent dipole moment in CNTs. Under strong electric field, the motion of CNTs distorted the director of adjacent LC molecules. Our detailed analysis of dynamics revealed that the four-lobe textures in vertical cell and two vertical stripes in in-plane switching cell were strongly correlated, i.e., the side view of textures by the vertical motion of CNTs in vertical cell was similar to the textures in in-plane switching cell. Interestingly, the magnitude of textures in microscope was strongly dependent on the size of CNTs and the applied field strength. The statistical size distribution of textures similar to that of CNTs provided information for the degree of dispersion of CNTs.

scholarly journals Dynamic behavior of a nematic liquid crystal with added carbon nanotubes in an electric field

2018 ◽  
Vol 9 ◽  
pp. 233-241 ◽  
Author(s):  
Emil Petrescu ◽  
Cristina Cirtoaje
Keyword(s):  
Carbon Nanotubes ◽  
Relaxation Time ◽  
Liquid Crystal ◽  
Electric Field ◽  
Dynamic Behavior ◽  
Nematic Liquid Crystal ◽  
Relaxation Times ◽  
Continuum Theory ◽  
Pure Liquid ◽  
Significant Difference

The dynamic behavior of a nematic liquid crystal with added carbon nanotubes (CNTs) in an electric field was analyzed. A theoretical model based on elastic continuum theory was developed and the relaxation times of nematic liquid crystals with CNTs were evaluated. Experiments made with single-walled carbon nanotubes dispersed in nematic 4-cyano-4’-pentylbiphenyl (5CB) indicated a significant difference of the relaxation time when compared to pure liquid crystal. We also noticed that the relaxation time when the field is switched off depends on how long the field was applied. It is shorter when the field is switched off immediately after application and longer when the field was applied for at least one hour.

Electric-Field-Induced Dispersion of Multiwalled Carbon Nanotubes in Nematic Liquid Crystal

2011 ◽  
Vol 115 (44) ◽  
pp. 21652-21658 ◽  
Author(s):  
Weiwei Tie ◽  
Gyu Hyung Yang ◽  
Surjya Sarathi Bhattacharyya ◽  
Young Hee Lee ◽  
Seung Hee Lee
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Electric Field ◽  
Multiwalled Carbon Nanotubes ◽  
Nematic Liquid Crystal ◽  
Multiwalled Carbon

Field-induced effects in an eutectic nematic liquid crystal mixture

2003 ◽  
Vol 81 (12) ◽  
pp. 1427-1432 ◽  
Author(s):  
A K Gathania ◽  
K K Raina
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Work Function ◽  
Domain Structure ◽  
Nematic Liquid Crystal ◽  
Threshold Field ◽  
Electric Field Effects ◽  
Dc Electric Field ◽  
Substrate Surfaces ◽  
Crystal Mixture

Electric-field effects were investigated in a planar-aligned nematic liquid crystal mixture. Under a DC electric field, we observed the presence of domains. The domain structure changed near the threshold field. The effects of charge injection from the substrate surfaces were investigated. The work function is calculated using Richardson's equation.PACS No.: 61.30.Hn

LIQUID CRYSTLASLIGHT SCATTERING BY FLUCTUATIONS INDUCED BY AN APPLIED ELECTRIC FIELD IN A NEMATIC LIQUID CRYSTAL (APAPA)

1972 ◽  
Vol 33 (C1) ◽  
pp. C1-63-C1-67 ◽  
Author(s):  
M. BERTOLOTTI ◽  
B. DAINO ◽  
P. Di PORTO ◽  
F. SCUDIERI ◽  
D. SETTE
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Applied Electric Field

scholarly journals Modeling Static Electric Field Effect on Nematic Liquid Crystal Director Orientation in Side-Electrode Cell

2018 ◽  
Vol 173 ◽  
pp. 03002 ◽  
Author(s):  
Alexander Ayriyan ◽  
Edik Ayryan ◽  
Alexandre Egorov ◽  
Maria Dencheva-Zarkova ◽  
Georgi Hadjichristov ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Finite Difference Methods ◽  
Electric Field Effect ◽  
Dimensional Model ◽  
Static Electric Field ◽  
Electrode Cell ◽  
Field Influence ◽  
Director Orientation

A two-dimensional model of Fredericks effect was used for the investigation of the static electric field influence on nematic liquid crystal director orientation in the side-electrode cell. The solutions of the equations describing the model were obtained by finite-difference methods. Fredericks transition threshold for the central part of the cell, as well as dependencies of the distribution of the director orientation patterns on the electric field and location, were obtained. The numerical results are found to agree qualitatively with the experiment. Further investigations are needed to elucidate completely the Fredericks effect.

Electric field assisted-unidirectional hybrid films of carbon nanotubes and liquid crystal polymer for light modulation

2019 ◽  
Vol 47 (3) ◽  
pp. 317-329 ◽  
Author(s):  
Weiwei Tie ◽  
Surjya Sarathi Bhattacharyya ◽  
Zhi Zheng ◽  
Kyung Jun Cho ◽  
Tae Hyung Kim ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Electric Field ◽  
Liquid Crystal Polymer ◽  
Light Modulation ◽  
Hybrid Films ◽  
Crystal Polymer ◽  
Unidirectional Hybrid
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