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Your search keyword '"Song, Zhigang"' showing total 6 results
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6 results on '"Song, Zhigang"'

1. Cell gap effects on domain size and electro-optical properties of normal-mode polymer-stabilised cholesteric texture

Author

Song Zhigang, Zong-Quan Wu, Xianghua Wang, Hongbo Lu, He Xiaoyue, Juntao Hu, Guobing Zhang, Guoqiang Lv, and Longzhen Qiu

Subjects
chemistry.chemical_classification, Materials science, genetic structures, business.industry, Scanning electron microscope, General Chemistry, Polymer, Condensed Matter Physics, eye diseases, Threshold voltage, Optics, chemistry, Liquid crystal, Normal mode, Electric field, General Materials Science, Contrast ratio, Texture (crystalline), Composite material, business
Abstract

The effects of cell gap on the electro-optical properties of normal-mode polymer-stabilised cholesteric texture (PSCT) have been investigated. In this study, the size of the domain and electro-optical properties of PSCT are analysed as a function of the thickness of the cells. Increasing cell gap helps to improve the contrast ratio, but the threshold voltage would increase simultaneously. The scanning electron microscopy indicates that the polymer networks are tightened with increasing cell gap. A denser polymer network leads to smaller domain size, higher effective electric field and decreased field-off response time.

Published
2015

2. Thickness dependence of the electro-optical properties of reverse-mode polymer-stabilised cholesteric texture

Author

Guobing Zhang, Wei Xu, Song Zhigang, Xianghua Wang, Jun Zhang, Jinliang Hu, Juntao Hu, Longzhen Qiu, Guoqiang Lv, and Hongbo Lu

Subjects
chemistry.chemical_classification, Morphology (linguistics), Materials science, genetic structures, Scanning electron microscope, business.industry, General Chemistry, Polymer, Condensed Matter Physics, eye diseases, Threshold voltage, Optics, chemistry, Liquid crystal, Molecule, General Materials Science, Contrast ratio, sense organs, Texture (crystalline), Composite material, business
Abstract

The cell gap dependence of the electro-optical properties of reverse-mode polymer-stabilised cholesteric texture has been investigated. In this study, the morphology and electro-optical properties were analysed as a function of the thickness of the cells. The scanning electron microscopy indicates that the polymer networks become tighter with the decrease of cell gap. Increasing cell gap can improve the contrast ratio exponentially, while the threshold voltage increases linearly. The field-off response time increases, which is ascribed to the decreasing elastic force between the polymer network and the LC molecules.

Published
2014

6. The influence of helical twisting power on the electro-optical properties of reverse-mode polymer-stabilised cholesteric texture.

Author

Lu, Hongbo, Song, Zhigang, Zhang, Jun, and Lv, Guoqiang

Subjects
*ELECTROOPTICS, *POLYMERS, *CHOLESTERIC liquid crystals, *DOPING agents (Chemistry), *CHIRALITY, *SCANNING electron microscopy, *MIXTURES
Abstract

Helical twisting power (HTP), an important parameter of the chiral dopant, was reported to have great influence on the electro-optical properties of reverse-mode polymer-stabilised cholesteric texture (PSCT). In this study, chiral dopants with different HTPs were used to prepare PSCT with the same pitch length. The effect of HTP on the morphology and electro-optical properties of PSCT was investigated. The scanning electron microscopy indicates that the polymer networks become tighter with the increase of HTP. It was found that the threshold voltage increases and field-off response time reduces, which is ascribed to the increasing elastic force between the polymer network and the LC molecules. [ABSTRACT FROM AUTHOR]

Published
2014
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