scholarly journals STATISTICAL THEORY OF HELICAL STRUCTURE IN SmC* LIQUID CRYSTALS

1996 ◽  
Vol 45 (7) ◽  
pp. 1168
Author(s):  
QIAN XIANG-ZHONG
Keyword(s):  
Statistical Theory ◽  
Liquid Crystals ◽  
Helical Structure

scholarly journals Statistical Theory of Helical Twisting in Nematic Liquid Crystals Doped with Chiral Nanoparticles

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1432
Author(s):  
Mikhail A. Osipov ◽  
Alexey S. Merekalov ◽  
Alexander A. Ezhov
Keyword(s):  
Field Theory ◽  
Statistical Theory ◽  
Liquid Crystals ◽  
Optical Activity ◽  
High Frequency ◽  
Low Frequency ◽  
Helical Structure ◽  
Dielectric Susceptibility ◽  
Effective Polarizability ◽  
Nematic Solvent

A molecular field theory of the cholesteric ordering in nematic nanocomposites doped with chiral nanoparticles was developed taking into consideration chiral dispersion interaction between rod-like nanoparticles. It was shown that the inverse pitch of the cholesteric helical structure is proportional to the anisotropy of the effective polarizability and the anisotropy of the effective gyration tensor of a nanoparticle in the nematic host. The theory enables one to predict the helical sense inversion induced by a change of the low-frequency dielectric susceptibility of the nematic host phase. The components of the high-frequency effective polarizability and the effective optical activity of a gold rod-like nanoparticle in a particular nematic solvent were calculated numerically.

scholarly journals Electrical Response of the Supramolecular Helical Structure and Laser Action in Chiral Photonic Bandgap Liquid Crystals

2003 ◽  
Vol 60 (10) ◽  
pp. 555-560 ◽  
Author(s):  
Seiichi FURUMI ◽  
Shiyoshi YOKOYAMA ◽  
Akira OTOMO ◽  
Shinro MASHIKO
Keyword(s):  
Liquid Crystals ◽  
Photonic Bandgap ◽  
Electrical Response ◽  
Laser Action ◽  
Helical Structure

Correlation in statistical theory of liquid crystals

1978 ◽  
Vol 25 (8) ◽  
pp. viii
Author(s):  
D.A. Badalyan ◽  
A.G. Khachaturyan
Keyword(s):  
Statistical Theory ◽  
Liquid Crystals

scholarly journals Sensing Characteristics of Side-Polished Fiber Based on the Alterations in Helical Structure of Thermo-Sensitive Cholesteric Liquid Crystals

Crystals ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 465
Author(s):  
Yuqi Han ◽  
Yan Jiang ◽  
Wei Guo
Keyword(s):  
Liquid Crystals ◽  
Structural Changes ◽  
Helical Structure ◽  
Polished Surface ◽  
Loss Peak ◽  
Cholesteric Liquid Crystals ◽  
Fiber Sensors ◽  
Temperature Changes ◽  
Solid Foundation ◽  
Transmitted Spectrum

Cholesteric liquid crystals (CLCs) are sensitive to environmental temperature changes, and have been employed as a specific intermediary for biosensors. Considering the temperature-dependent structural changes of CLCs, this study aimed to determine the sensing properties of side-polished fibers (SPFs) after coating with CLCs. The experimental results demonstrated that, with regard to the transmitted spectrum, the loss peak of CLC-coated SPFs exhibited a positive linear relationship with temperature changes over a range of 20 to 50 °C. The linear correlation coefficient achieved 97.8% when the temperature increased by 10 °C, and the loss peak drifted by 12.72 nm. The reflectance spectrum of CLCs coated on the polished surface were obtained using optical fiber sensors. The feasibility of measuring the helical structure of CLCs was further verified using SPF transmission spectroscopy. The findings indicated that the transmitted spectrum of SPFs could be adopted to characterize the helical structure of CLCs, which lays a solid foundation for further study on SPF-based biosensors.

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