scholarly journals Studies of nanocomposites of carbon nanotubes and a negative dielectric anisotropy liquid crystal

2014 ◽  
Vol 140 (10) ◽  
pp. 104908 ◽  
Author(s):  
P. Kalakonda ◽  
R. Basu ◽  
I. R. Nemitz ◽  
C. Rosenblatt ◽  
G. S. Iannacchione
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Dielectric Anisotropy

Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes

Carbon ◽  
2019 ◽  
Vol 152 ◽  
pp. 865-872 ◽  
Author(s):  
Yun-Yun Ji ◽  
Fei Fan ◽  
Shi-Tong Xu ◽  
Jian-Ping Yu ◽  
Yan Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Dual Frequency

scholarly journals Signal Amplification in an Optical and Dielectric Biosensor Employing Liquid Crystal-Photopolymer Composite as the Sensing Medium

Biosensors ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 81
Author(s):  
Hassanein Shaban ◽  
Shih-Chun Yen ◽  
Mon-Juan Lee ◽  
Wei Lee
Keyword(s):  
Dielectric Constant ◽  
Liquid Crystal ◽  
Uv Irradiation ◽  
Signal Amplification ◽  
Limit Of Detection ◽  
Optical Signal ◽  
Uv Exposure ◽  
Dielectric Anisotropy ◽  
Optical Texture ◽  
Potential Development

An optical and dielectric biosensor based on a liquid crystal (LC)–photopolymer composite was established in this study for the detection and quantitation of bovine serum albumin (BSA). When the nematic LC E7 was doped with 4-wt.% NOA65, a photo-curable prepolymer, and photopolymerized by UV irradiation at 20 mW/cm2 for 300 s, the limit of detection determined by image analysis of the LC optical texture and dielectric spectroscopic measurements was 3400 and 88 pg/mL for BSA, respectively, which were lower than those detected with E7 alone (10 μg/mL BSA). The photopolymerized NOA65, but not the prepolymer prior to UV exposure, contributed to the enhanced optical signal, and UV irradiation of pristine E7 in the absence of NOA65 had no effect on the optical texture. The effective tilt angle θ, calculated from the real-part dielectric constant ε’, decreased with increasing BSA concentration, providing strong evidence for the correlation of photopolymerized NOA65 to the intensified disruption in the vertically oriented LC molecules to enhance the optical and dielectric signals of BSA. The optical and dielectric anisotropy of LCs and the photo-curable dopant facilitate novel quantitative and signal amplification approaches to potential development of LC-based biosensors.

scholarly journals Effect of Doping ofCd1−xZnxS/ZnS Core/Shell Quantum Dots in Negative Dielectric Anisotropy Nematic Liquid Crystal p-Methoxybenzylidene p-Decylaniline

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 605
Author(s):  
Ayushi Rastogi ◽  
Fanindra Pandey ◽  
Rajiv Manohar ◽  
Shri Singh
Keyword(s):  
Quantum Dots ◽  
Liquid Crystal ◽  
Dielectric Permittivity ◽  
Nematic Liquid Crystal ◽  
Phase Shifters ◽  
Ion Trapping ◽  
Dielectric Anisotropy ◽  
Core Shell ◽  
Optical Parameters ◽  
Dielectric Parameters

We report the effect of the doping of Cd1−xZnxS/ZnS core/shell quantum dots (CSQDs) in nematic liquid crystal p-methoxybenzylidenep-decylaniline (MBDA) at 0.05 wt/wt%, 0.1 wt/wt%, 0.15 wt/wt%, 0.2 wt/wt%, 0.25 wt/wt%, and 0.3 wt/wt% concentrations of CSQDs in MBDA. Dielectric parameters with and without bias with respect to frequency have been investigated. The change in electro-optical parameters with temperature has also been demonstrated. The increase in the mean dielectric permittivity was found due to the large dipole moment of CSQDs, which impose stronger interactions with the liquid crystal molecules. The dielectric anisotropy changes sign on doping CSQDs in MBDA liquid crystal. It was concluded that the CSQD doping noticeably increased the dielectric permittivity of nematic MBDA in the presence of an electric field. The doping of CSQDs in nematic MBDA liquid crystal reduced the ion screening effect effectively. This phenomenon is attributed to the competition between the generated ionic impurities during the assembling process and the ion trapping effect of the CSQDs. The rotational viscosity of nematic liquid crystal decreased with increasing concentration of the CSQDs, with a faster response time observed for the 0.05 wt/wt% concentration. The birefringence of the doped system increased with the inclusion of CSQDs in MBDA. These results find application in the field of display devices, phase shifters, LC – gratings, TIR waveguide, industries, and projectors.

66.1: High Birefringence and Negative Dielectric Anisotropy Liquid Crystal Mixtures for Vertical Alignment Applications

2009 ◽  
Vol 40 (1) ◽  
pp. 992
Author(s):  
Sebastian Gauza ◽  
Meizi Jiao ◽  
Shin-Tson Wu ◽  
Przemysław Kula ◽  
Roman Dabrowski ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Vertical Alignment ◽  
High Birefringence

scholarly journals A tactile sensing array with tunable sensing ranges using liquid crystal and carbon nanotubes composites

2012 ◽  
Vol 177 ◽  
pp. 48-53 ◽  
Author(s):  
Yu-Tse Lai ◽  
Yung-Ming Chen ◽  
Tyng Liu ◽  
Yao-Joe Yang
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Tactile Sensing

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

scholarly journals Liquid crystal suspensions of carbon nanotubes assisted by organically modified Laponite nanoplatelets

Carbon ◽  
2014 ◽  
Vol 68 ◽  
pp. 389-398 ◽  
Author(s):  
O. Yaroshchuk ◽  
S. Tomylko ◽  
O. Kovalchuk ◽  
N. Lebovka
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Organically Modified

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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