Dispersion of multi walled carbon nanotubes in a hydrogen bonded liquid crystal

2010 ◽  
Vol 405 (21) ◽  
pp. 4418-4423 ◽  
Author(s):  
V.N. Vijayakumar ◽  
M.L.N. Madhu Mohan
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes ◽  
Hydrogen Bonded

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.

Depth map sensor based on optical doped lens with multi-walled carbon nanotubes of liquid crystal

2015 ◽  
Vol 55 (1) ◽  
pp. 140 ◽  
Author(s):  
Li Hui ◽  
Pan Fan ◽  
Wu Yuntao ◽  
Zhang Yanduo ◽  
Xie Xiaolin
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Depth Map ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

scholarly journals Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes

2015 ◽  
Vol 6 ◽  
pp. 396-403 ◽  
Author(s):  
Amanda García-García ◽  
Ricardo Vergaz ◽  
José Francisco Algorri ◽  
Xabier Quintana ◽  
José Manuel Otón
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Electric Field ◽  
Electrical Response ◽  
Characteristic Impedance ◽  
Self Organized ◽  
The Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Elongated Nanoparticles ◽  
Walled Carbon Nanotubes

The inclusion of nanoparticles modifies a number of fundamental properties of many materials. Doping of nanoparticles in self-organized materials such as liquid crystals may be of interest for the reciprocal interaction between the matrix and the nanoparticles. Elongated nanoparticles and nanotubes can be aligned and reoriented by the liquid crystal, inducing noticeable changes in their optical and electrical properties. In this work, cells of liquid crystal doped with high aspect ratio multi-walled carbon nanotubes have been prepared, and their characteristic impedance has been studied at different frequencies and excitation voltages. The results demonstrate alterations in the anisotropic conductivity of the samples with the applied electric field, which can be followed by monitoring the impedance evolution with the excitation voltage. Results are consistent with a possible electric contact between the coated substrates of the LC cell caused by the reorientation of the nanotubes. The reversibility of the doped system upon removal of the electric field is quite low.

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