scholarly journals Nematic liquid crystal reorientation around multi-walled carbon nanotubes mapped via Raman microscopy

2016 ◽  
Vol 24 (14) ◽  
pp. 15954 ◽  
Author(s):  
T. Cacace ◽  
A. García-García ◽  
G. Zito ◽  
V. Tkachenko ◽  
G. Rusciano ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Raman Microscopy ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications

2021 ◽  
Vol 2 (4) ◽  
pp. 466-481
Author(s):  
Bhupendra Pratap Singh ◽  
Samiksha Sikarwar ◽  
Kamal Kumar Pandey ◽  
Rajiv Manohar ◽  
Michael Depriester ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Orientational Order ◽  
Isotropic Phase ◽  
Multi Walled Carbon Nanotubes ◽  
Vertically Aligned ◽  
Higher Temperature ◽  
Optical Applications ◽  
Walled Carbon Nanotubes

In this paper, we investigate a commercial nematic liquid crystal (LC) mixture namely E7 dispersed with small concentrations of multi-walled carbon nanotubes (MWCNTs). The dielectric and electro-optical characterizations have been carried out in the homogeneously and vertically aligned LC cells. The electro-optical response of LC molecules has been enhanced by 60% after the addition of MWCNTs, which is attributed to the reduced rotational viscosity in the composites. MWCNTs act like barricades for ionic impurities by reducing them up to ∼34.3% within the dispersion limit of 0.05 wt%. The nematic–isotropic phase transition temperature (TNI) of the E7 LC has also been shifted towards the higher temperature, resulting in a more ordered nematic phase. The enhanced birefringence and orientational order parameter in the LC-MWCNTs are attributed to π-π electron stacking between the LC molecules and the MWCNTs. The outlined merits of the LC-MWCNTs composites evince their suitability for ultrafast nematic-based electro-optical devices.

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