Addition of single-wall carbon nanotubes to a liquid crystal material: Impact on dielectric properties

2015 ◽  
Vol 34 ◽  
pp. 182-188 ◽  
Author(s):  
Y. Gursel ◽  
B.F. Şenkal ◽  
N. Yilmaz Canli ◽  
Z. Güven Özdemir ◽  
E. Ahlatcioğlu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Dielectric Properties ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Crystal Material ◽  
Liquid Crystal Material

Liquid crystal behavior of single wall carbon nanotubes

Carbon ◽  
2010 ◽  
Vol 48 (12) ◽  
pp. 3531-3542 ◽  
Author(s):  
M. Bravo-Sanchez ◽  
Trevor J. Simmons ◽  
M.A. Vidal
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon

Morphological and Dielectric Behavior of Carbon Nanotube-Ferroelectric Liquid Crystal Composite

2009 ◽  
Vol 67 ◽  
pp. 167-172 ◽  
Author(s):  
Deepika Sharma ◽  
Sachin Tyagi ◽  
K.K. Raina
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Carbon Nanotube ◽  
Phase Transformations ◽  
Dielectric Behavior ◽  
Morphological Properties ◽  
Scanning Calorimetry ◽  
Crystal Material ◽  
Liquid Crystal Material ◽  
High Dielectric

The present study deals with the effect of dispersing Carbon Nano Tubes in Ferro-electric liquid crystal material. Carbon nanotube dispersed ferroelectric liquid crystals have high dielectric constant, fast switching response, large electro-optic coefficient which makes them ideal for memories, capacitors and display devices etc. An attempt has been made to understand the influence of carbon nanotubes on dielectric and morphological properties of ferro-electric liquid crystal. The effect of carbon nanotubes concentration on the transition temperature of ferro-electric liquid crystal is also studied. Hot Stage Microscope is used to investigate the texture and phase transformations in the composite. Differential Scanning Calorimetry also indicated the phase transformations. The results are compared with the original ferro-electric liquid crystal material which showed that the dielectric permittivity is increased to a great extent with the addition of carbon nanotubes.

scholarly journals Reorientation of single-wall carbon nanotubes in negative anisotropy liquid crystals by an electric field

2016 ◽  
Vol 7 ◽  
pp. 825-833 ◽  
Author(s):  
Amanda García-García ◽  
Ricardo Vergaz ◽  
José F Algorri ◽  
Gianluigi Zito ◽  
Teresa Cacace ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Field ◽  
Single Wall Carbon Nanotubes ◽  
Single Wall Carbon ◽  
Self Organized ◽  
Crystal Properties ◽  
Microscopic Inspection ◽  
Liquid Crystal Orientation

Single-wall carbon nanotubes (SWCNT) are anisotropic nanoparticles that can cause modifications in the electrical and electro-optical properties of liquid crystals. The control of the SWCNT concentration, distribution and reorientation in such self-organized fluids allows for the possibility of tuning the liquid crystal properties. The alignment and reorientation of CNTs are studied in a system where the liquid crystal orientation effect has been isolated. Complementary studies including Raman spectroscopy, microscopic inspection and impedance studies were carried out. The results reveal an ordered reorientation of the CNTs induced by an electric field, which does not alter the orientation of the liquid crystal molecules. Moreover, impedance spectroscopy suggests a nonnegligible anchoring force between the CNTs and the liquid crystal molecules.

scholarly journals Dielectric properties of single wall carbon nanotubes-based gelatin phantoms

2018 ◽  
Vol 08 (02) ◽  
pp. 1850010
Author(s):  
M. M. Altarawneh ◽  
G. A. Alharazneh ◽  
O. Y. Al-Madanat
Keyword(s):  
Carbon Nanotubes ◽  
Dielectric Constant ◽  
Relaxation Time ◽  
Dielectric Properties ◽  
Dielectric Constants ◽  
Static Dielectric Constant ◽  
Single Wall Carbon Nanotubes ◽  
Cole Plot ◽  
Single Wall Carbon ◽  
Average Relaxation Time

In this work, we report the dielectric properties of Single wall Carbon Nanotubes (SWCNTs)-based phantom that is mainly composed of gelatin and water. The fabricated gelatin-based phantom with desired dielectric properties was fabricated and doped with different concentrations of SWCNTs (e.g., 0%, 0.05%, 0.10%, 0.15%, 0.2%, 0.4% and 0.6%). The dielectric constants (real [Formula: see text] and imaginary [Formula: see text] were measured at different positions for each sample as a function of frequency (0.5–20[Formula: see text]GHz) and concentrations of SWCNTs and their averages were found. The Cole–Cole plot ([Formula: see text] versus [Formula: see text] was obtained for each concentration of SWCNTs and was used to obtain the static dielectric constant [Formula: see text], the dielectric constant at the high limit of frequency [Formula: see text] and the average relaxation time [Formula: see text]. The measurements showed that the fabricated samples are in good homogeneity and the SWCNTs are dispersed well in the samples as an acceptable standard deviation is achieved. The study showed a linear increase in the static dielectric constant [Formula: see text] and invariance of the average relaxation time [Formula: see text] and the value of [Formula: see text] at room temperature for the investigated concentrations of SWCNTs.

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