Incorporation and orientational order of aligned carbon nanotube sheets on polymer films for liquid crystal-aligning transparent electrodes

2018 ◽  
Vol 267 ◽  
pp. 363-366 ◽  
Author(s):  
MD. Asiqur Rahman ◽  
Hakam Agha ◽  
Thuy-Kieu Truong ◽  
Ji Hyun Park ◽  
Dongseok Suh ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Carbon Nanotube ◽  
Polymer Films ◽  
Orientational Order ◽  
Transparent Electrodes

Optical Study of Liquid Crystal Doped with Multiwalled Carbon Nanotube

2014 ◽  
Vol 13 (04) ◽  
pp. 1440001
Author(s):  
Rita A. Gharde ◽  
Sangeeta Y. Thakare
Keyword(s):  
Liquid Crystal ◽  
Carbon Nanotube ◽  
Optical Fibers ◽  
Liquid Crystalline ◽  
Effective Means ◽  
Orientational Order ◽  
Multiwall Carbon Nanotube ◽  
Multiwalled Carbon ◽  
Vis Spectroscopy ◽  
Crystal Dispersion

Liquid crystalline materials have been useful for display devices i.e watches, calculators, automobile dashboards, televisions, multi media projectors etc. as well as in electro tunable lasers, optical fibers and lenses. Carbon nanotube is chosen as the main experimental factor in this study as it has been observed that Carbon Nano Tube influence the existing properties of liquid crystal host and with the doping of CNT can enhance1 the properties of LC. The combination of carbon nanotube (CNT) and liquid crystal (LC) materials show considerable interest in the scientific community due to unique physical properties of CNT in liquid crystal. Dispersion of CNTs in LCs can provide us a cheap, simple, versatile and effective means of controlling nanotube orientation on macroscopic scale with no restrictions on nanotube type. LCs have the long range orientational order rendering them to be anisotropic phases. If CNTs can be well dispersed in LC matrix, they will align with their long axes along the LC director to minimize distortions of the LC director field and the free energy. In this paper, we doped liquid crystal (Cholesteryl Nonanoate) by a small amount of multiwall carbon nanotube 0.05% and 0.1% wt. We found that by adding carbon nanotube to liquid crystals the melting point of the mixture is decreased but TNI is increased. It has been also observed that with incereas in concentration of carbon nanotube into liquid crystal shows conciderable effect on LC. The prepared samples were characterized using various techniques to study structural, thermal and optical properties i.e PMS, FPSS, UV-Vis spectroscopy, FT-IR measurements, and DTA.

Super-aligned carbon nanotube films as aligning layers and transparent electrodes for liquid crystal displays

Carbon ◽  
2010 ◽  
Vol 48 (7) ◽  
pp. 1876-1879 ◽  
Author(s):  
Weiqi Fu ◽  
Liang Liu ◽  
Kaili Jiang ◽  
Qunqing Li ◽  
Shoushan Fan
Keyword(s):  
Liquid Crystal ◽  
Carbon Nanotube ◽  
Liquid Crystal Displays ◽  
Transparent Electrodes ◽  
Nanotube Films

Heat Resistance of Ga-Doped ZnO Thin Films for Application as Transparent Electrodes in Liquid Crystal Displays

2010 ◽  
Vol 157 (2) ◽  
pp. J13 ◽  
Author(s):  
Naoki Yamamoto ◽  
Hisao Makino ◽  
Takahiro Yamada ◽  
Yoshinori Hirashima ◽  
Hiroaki Iwaoka ◽  
...  
Keyword(s):  
Thin Films ◽  
Liquid Crystal ◽  
Heat Resistance ◽  
Liquid Crystal Displays ◽  
Zno Thin Films ◽  
Transparent Electrodes ◽  
Doped Zno

Strong dark current suppression in flexible organic photodetectors by carbon nanotube transparent electrodes

Nano Today ◽  
2021 ◽  
Vol 37 ◽  
pp. 101081
Author(s):  
Woongsik Jang ◽  
Byung Gi Kim ◽  
Seungju Seo ◽  
Ahmed Shawky ◽  
Min Soo Kim ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Dark Current ◽  
Transparent Electrodes ◽  
Organic Photodetectors

scholarly journals Vertical Orientation of Liquid Crystal on 4-n-Alkyloxyphenoxymethyl-Substituted Polystyrene Containing Liquid Crystal Precursor

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 736
Author(s):  
Kyutae Seo ◽  
Hyo Kang
Keyword(s):  
Molecular Structure ◽  
Liquid Crystal ◽  
Surface Energy ◽  
Polymer Films ◽  
Ultraviolet Irradiation ◽  
Molar Fraction ◽  
Side Chain ◽  
Polymer Modification ◽  
Vertical Orientation ◽  
Surface Energies

We synthesized a series of polystyrene derivatives that were modified with precursors of liquid crystal (LC) molecules, such as 4-ethyloxyphenol (homopolymer PEOP and copolymer PEOP#; # = 20, 40, 60, and 80, where # indicates the molar fraction of 4-ethyloxyphenoxymethyl in the side chain), 4-n-butyloxyphenol (PBOP), 4-n-hexyloxyphenol (PHOP), and 4-n-octyloxyphenol (POOP), via polymer modification reaction to investigate the orientation of LC molecules on polymer films, exhibiting part of the LC molecular structure. LC molecules showed a stable and uniform vertical orientation in LC cells fabricated with polymers that have 4-ethyloxyphenoxymethyl in the range of 40–100 mol%. In addition, similar results were obtained in LC cells fabricated with homopolymers of PEOP, PBOP, PHOP, and POOP. The vertical orientation of LC molecules in LC cells fabricated with polymer films correlated to the surface energy of polymer films. For example, vertical LC orientation was observed when the total surface energies of the polymer films were lower than approximately 43.2 mJ/m2. Good alignment stabilities were observed at 150 °C and 20 J/cm2 of ultraviolet irradiation for LC cells fabricated with PEOP film.

A chiral–racemic lyotropic chromonic liquid crystal system

Soft Matter ◽  
2021 ◽  
Author(s):  
Jordan K. Ando ◽  
Peter J. Collings
Keyword(s):  
Liquid Crystal ◽  
Optical Microscopy ◽  
Orientational Order ◽  
Molecular Assemblies ◽  
Polarized Optical Microscopy ◽  
Crystal System ◽  
System P ◽  
Liquid Crystal System

A lyotropic chromonic liquid crystal consists of oriented molecular assemblies in solution. If the molecules are chiral, the helical pattern of orientational order is revealed by the stripes seen with polarized optical microscopy.

scholarly journals The interplay between spatial and heliconical orientational order in twist-bend nematic materials

2021 ◽  
Vol 23 (7) ◽  
pp. 4055-4063
Author(s):  
R. Saha ◽  
C. Feng ◽  
C. Welch ◽  
G. H. Mehl ◽  
J. Feng ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Correlation Length ◽  
Orientational Order ◽  
Smectic Phase ◽  
Sulfur Containing

In sulfur containing liquid crystal dimers we find that at the transition to the NTB phase the positional correlation length drops. The nanoscale periodicity was also observed in the upper range of a smectic phase that forms below the NTB state.

scholarly journals Liquid Crystal Ordering in the Hexagonal Phase of Rod-Coil Diblock Copolymers

Polymers ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1262
Author(s):  
Mikhail A. Osipov ◽  
Maxim V. Gorkunov ◽  
Alexander A. Antonov
Keyword(s):  
Liquid Crystal ◽  
Order Parameter ◽  
Density Functional ◽  
Diblock Copolymers ◽  
Microphase Separation ◽  
Hexagonal Phase ◽  
Orientational Order ◽  
Order Parameters ◽  
Copolymer Composition ◽  
Rigid Rod

Density functional theory of rod-coil diblock copolymers, developed recently by the authors, has been generalised and used to study the liquid crystal ordering and microphase separation effects in the hexagonal, lamellar and nematic phases. The translational order parameters of rod and coil monomers and the orientational order parameters of rod-like fragments of the copolymer chains have been determined numerically by direct minimization of the free energy. The phase diagram has been derived containing the isotropic, the lamellar and the hexagonal phases which is consistent with typical experimental data. The order parameter profiles as functions of temperature and the copolymer composition have also been determined in different anisotropic phases. Finally, the spatial distributions of the density of rigid rod fragments and of the corresponding orientational order parameter in the hexagonal phase have been calculated.

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