View in EDS

Thermal control of tunable photonic optical bandgaps in different cholesteric liquid crystals mixtures.

Saved in:
Bibliographic Details
Title: Thermal control of tunable photonic optical bandgaps in different cholesteric liquid crystals mixtures.
Authors: Labeeb, Ahmad M.1 (AUTHOR) ahmad.labeeb@alumni.manchester.ac.uk, Ward, Yassmin A.2 (AUTHOR) yasmineadel@a-arts.helwan.edu.eg, Fikry, Mohamed1,3 (AUTHOR) m_fikry80@yahoo.com
Source: Journal of Molecular Liquids. Oct2021, Vol. 340, pN.PAG-N.PAG. 1p.
Subjects: Cholesteric liquid crystals, Liquid mixtures, Liquid crystal states, Photonic band gap structures, Liquid crystals, Optical materials
Abstract: • Cholesteric liquid crystals in series of binary and ternary mixtures are acting as photonic liquid crystals. • The materials have the ability to control the photonic band gap energies. • The P hotonic bandgaps energy is tuned in order to change of temperature, texture and phase type of liquid crystal. • In the same fabricated devices without need to be exchanged, varieties of optical properties are available. Tunable photonic optical bandgaps materials and devices have attracted many interests since the beginning of the second millennia. The cholesteric liquid crystals and their mixtures are having the ability to tune photonic bandgaps. This research article is presenting ternary and binary cholesteric liquid crystals which are based on Cholesteryl Oleyl Carbonate COC, Cholesteryl Benzoate CB, and Cholesteryl Nonanoate CN. The six composed mixtures are suitable for tunability adaptation and have been studied by Polarizing optical microscope POM to investigating the formed textures. The differential scanning Calorimetry DSC measurements were performed to determine the thermal stability and phase transitions for both composing materials and composed mixtures. The optical properties as Maximum wavelength (λ max ), full width half maximum (FWHM), and photonic bandgap energy (U g) determination have been determined for all composed mixtures at different temperatures. Interestingly, the bandgap is tuned overall IR-Vis-UV bands with different percentages of cholesteric liquid crystalline materials and concerning to their twist power of the imposed helical structures. The optimum tuned bandgap is produced in mixtures coded AMJ3 and AMJ4. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Molecular Liquids is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
Description
Abstract:• Cholesteric liquid crystals in series of binary and ternary mixtures are acting as photonic liquid crystals. • The materials have the ability to control the photonic band gap energies. • The P hotonic bandgaps energy is tuned in order to change of temperature, texture and phase type of liquid crystal. • In the same fabricated devices without need to be exchanged, varieties of optical properties are available. Tunable photonic optical bandgaps materials and devices have attracted many interests since the beginning of the second millennia. The cholesteric liquid crystals and their mixtures are having the ability to tune photonic bandgaps. This research article is presenting ternary and binary cholesteric liquid crystals which are based on Cholesteryl Oleyl Carbonate COC, Cholesteryl Benzoate CB, and Cholesteryl Nonanoate CN. The six composed mixtures are suitable for tunability adaptation and have been studied by Polarizing optical microscope POM to investigating the formed textures. The differential scanning Calorimetry DSC measurements were performed to determine the thermal stability and phase transitions for both composing materials and composed mixtures. The optical properties as Maximum wavelength (λ max ), full width half maximum (FWHM), and photonic bandgap energy (U g) determination have been determined for all composed mixtures at different temperatures. Interestingly, the bandgap is tuned overall IR-Vis-UV bands with different percentages of cholesteric liquid crystalline materials and concerning to their twist power of the imposed helical structures. The optimum tuned bandgap is produced in mixtures coded AMJ3 and AMJ4. [ABSTRACT FROM AUTHOR]
ISSN:01677322
DOI:10.1016/j.molliq.2021.117179