Textural Spectral Characteristics of the Cholesteric Liquid Crystal

2010 ◽  
Vol 428-429 ◽  
pp. 241-246
Author(s):  
Jia Ling Wang ◽  
Xin Du ◽  
Jia Lv ◽  
Tian Chi Yu ◽  
Zhi Xin Fan
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Cholesteric Liquid Crystal ◽  
Spectral Characteristics ◽  
Optoelectronic Devices ◽  
Liquid Crystal Displays ◽  
Transmission Property ◽  
Large Crystal ◽  
Important Significance

For the cholesteric liquid crystal (hereinafter short for Ch-LC) possesses special optical properties, it has specific applications in the area of liquid crystal displays and optoelectronic devices. Specimens of Ch-LCs in planar and focal conic texture stably are prepared. The photographs of textures are shot by polarizing microscope and transmittance spectrums of different textures are measured by spectrophotometer. It is found that the specimen in focal conic texture with large crystal domains has the well transmission property. The experiment has an important significance for applications of liquid crystals.

Acetone Sensing Based on Transmittance of Hydroxyethyl Methacrylate-Liquid Crystal Materials

2020 ◽  
Vol 840 ◽  
pp. 424-429
Author(s):  
Harry Miyosi Silalahi ◽  
Wei Fan Chiang ◽  
Chia Yi Huang
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Cholesteric Liquid Crystal ◽  
Thickness Effect ◽  
Helical Axis ◽  
Hydroxyethyl Methacrylate ◽  
Absorption Process ◽  
Natural Property ◽  
Mixture Concentration

Poly hydroxyethyl methacrylate (p-HEMA) has a natural property that is very easy to absorb a liquid or solution and become a hydrogel when absorbing water. In this work, by combining p-HEMA material with a cholesteric liquid crystal (CLC), the material can absorb the solution and the optical properties of the liquid crystal will change depending on the solution it absorbs. The solution used in this work is acetone. During the absorption process the p-HEMA material expanded so that the orientation direction of liquid crystal molecular twist with a helical axis along can freely move and change. In this work, we observed the study of transmittance caused by thickness effect and the mixture concentration effect of the poly hydroxyethyl methacrylate liquid crystals (PHM-LC).

scholarly journals Thermo-Chromic Response of Polymer Stabilized Cholesteric Liquid Crystal for Thermal Imaging

2019 ◽  
Vol 1 (2) ◽  
Author(s):  
Rishi Kumar
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Thermal Imaging ◽  
Cholesteric Liquid Crystal ◽  
Helical Structure ◽  
Cholesteric Liquid Crystals ◽  
Polymer Stabilized

Cholesteric liquid crystal (Ch-LC) exhibits many remarkable optical properties due to formation of a macroscopic helical structure. A low amount of monomer (5wt.%) is dispersed into cholesteric liquid crystal and get polymerized under UV radiations to form polymer stabilized cholesteric texture (PSCT). The thermo-chromic response made this device suitable for the developing applications in thermal imaging. Temperature based measurements of PSCT exploits the key property of some polymer stabilized cholesteric liquid crystals (PSCLC) to reflect definite colors at specific temperatures. The selective color of PSCT texture shifts with raise in temperature from 30oC to 85oC, which can be utilized in thermal imaging applications.

Nonlinear optical properties of fast, photoswitchable cholesteric liquid crystal bandgaps

2011 ◽  
Vol 1 (5) ◽  
pp. 943 ◽  
Author(s):  
Uladzimir A. Hrozhyk ◽  
Svetlana V. Serak ◽  
Nelson V. Tabiryan ◽  
Timothy J. White ◽  
Timothy J. Bunning
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Nonlinear Optical ◽  
Cholesteric Liquid Crystal ◽  
Nonlinear Optical Properties

Luminescent dichroic-dye-doped cholesteric liquid-crystal displays

2004 ◽  
Vol 12 (3) ◽  
pp. 341 ◽  
Author(s):  
Andro Chanishvili ◽  
Guram Chilaya ◽  
Gia Petriashvili ◽  
Riccardo Barberi ◽  
Roberto Bartolino ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Liquid Crystal Displays ◽  
Dichroic Dye

Substrate-free cholesteric liquid-crystal displays

2008 ◽  
Vol 16 (1) ◽  
pp. 113 ◽  
Author(s):  
Irina Shiyanovskaya ◽  
Seth Green ◽  
Asad Khan ◽  
Greg Magyar ◽  
Oleg Pishnyak ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Liquid Crystal Displays

scholarly journals Optimized Soft Lithography Method for Polymer Cholesteric Liquid Crystal Flakes Fabrication

Micromachines ◽  
2019 ◽  
Vol 10 (7) ◽  
pp. 441 ◽  
Author(s):  
Guanqing Zhou ◽  
Sunqian Liu ◽  
Wei Liu ◽  
Dong Yuan ◽  
Guofu Zhou
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Polyvinyl Alcohol ◽  
Soft Lithography ◽  
Cholesteric Liquid Crystal ◽  
Release Time ◽  
Pdms Mold ◽  
Speed Up ◽  
Liquid Crystal Flakes

Polymer cholesteric liquid crystal (PCLC) flakes are gaining increasing interest for a wide variety of applications because of their unique optical properties and capabilities. Soft lithography is the most effective way to fabricate regularly shaped PCLC flakes. However, it is not easy to peel the flakes from the mold without breaking them. In order to peel the PCLC flakes from the patterned polydimethylsiloxane (PDMS) mold in a convenient way, in this paper, a method of coating a layer of polyvinyl alcohol (PVA) on a PDMS mold was proposed. The influence of the thickness of the PVA layer on the shape of the PCLC flakes and the release time from the PDMS mold were investigated. The results show that the presence of the PVA layer can speed up the release of the PCLC flakes and help maintain the shape effectively. Notably, the utilization of a PVA layer makes the PDMS mold recyclable. The influence of PCLC flake shape was also studied. This work will promote the development of switchable PCLC flake-based technologies.

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