Aryl fluoroalkyl sulfoxides: optical stability and pKa measurement

2021 ◽  
Author(s):  
Amélia Messara ◽  
Nicolas Vanthuyne ◽  
Patrick Diter ◽  
Mourad Elhabiri ◽  
Armen Panossian ◽  
...  
Keyword(s):  
Optical Stability

Effect of Techniques for Polishing Molybdenum Mirrors on their Optical Stability under Cleaning D2–N2 Plasma

2020 ◽  
Vol 14 (5) ◽  
pp. 1003-1015
Author(s):  
A. E. Gorodetsky ◽  
A. V. Markin ◽  
V. L. Bukhovets ◽  
V. L. Voytitsky ◽  
T. V. Rybkina ◽  
...  
Keyword(s):  
Optical Stability ◽  
N2 Plasma

scholarly journals Encapsulated Passivation of Perovskite Quantum Dot (CsPbBr3) Using a Hot-Melt Adhesive (EVA-TPR) for Enhanced Optical Stability and Efficiency

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 419
Author(s):  
Saradh Prasad ◽  
Mamduh J. Aljaafreh ◽  
Mohamad S. AlSalhi ◽  
Abeer Alshammari
Keyword(s):  
Quantum Dots ◽  
Band Gap ◽  
Surface Defects ◽  
Optoelectronic Devices ◽  
Ethylene Vinyl Acetate ◽  
Light Emitting ◽  
Optical Stability ◽  
Perovskite Quantum Dots ◽  
Polymer Light Emitting Diodes ◽  
Hot Melt

The notable photophysical characteristics of perovskite quantum dots (PQDs) (CsPbBr3) are suitable for optoelectronic devices. However, the performance of PQDs is unstable because of their surface defects. One way to address the instability is to passivate PQDs using different organic (polymers, oligomers, and dendrimers) or inorganic (ZnS, PbS) materials. In this study, we performed steady-state spectroscopic investigations to measure the photoluminescence (PL), absorption (A), transmission (T), and reflectance (R) of perovskite quantum dots (CsPbBr3) and ethylene vinyl acetate/terpene phenol (1%) (EVA-TPR (1%), or EVA) copolymer/perovskite composites in thin films with a thickness of 352 ± 5 nm. EVA is highly transparent because of its large band gap; furthermore, it is inexpensive and easy to process. However, the compatibility between PQDs and EVA should be established; therefore, a series of analyses was performed to compute parameters, such as the band gap, the coefficients of absorbance and extinction, the index of refractivity, and the dielectric constant (real and imaginary parts), from the data obtained from the above investigation. Finally, the optical conductivities of the films were studied. All these analyses showed that the EVA/PQDs were more efficient and stable both physically and optically. Hence, EVA/PQDs could become copolymer/perovskite active materials suitable for optoelectronic devices, such as solar cells and perovskite/polymer light-emitting diodes (PPLEDs).

Design, Synthesis and Use of Phthalocyanines as a New Class of Visible-Light Photoinitiators for Free-Radical and Cationic Polymerizations

2021 ◽  
Author(s):  
Davy-Louis Versace ◽  
Louise Breloy ◽  
Yusuf Yagci ◽  
Ismail Yilmaz ◽  
Ozgur Yavuz
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Design Synthesis ◽  
New Class ◽  
Optical Stability ◽  
Cationic Polymerizations

Phthalocyanines (Pcs) are interesting molecules offering a fascinating chemistry world which received tremendous interest in the last decade. Their certain features such as high thermal, chemical, and optical stability as...

Nonlinear Optical Stability of Polyphenylsulfone (PPSU)‐Containing Anthraquinones with High Transmittance

2021 ◽  
pp. 2100112
Author(s):  
Zengduo Cui ◽  
Jiale Ding ◽  
Xuanbo Zhu ◽  
Bolong Li ◽  
Haibo Zhang ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Optical Stability

An optically stable and tunable quantum dot nanocrystal-embedded cholesteric liquid crystal composite laser

2014 ◽  
Vol 2 (22) ◽  
pp. 4388-4394 ◽  
Author(s):  
Lin-Jer Chen ◽  
Jia-De Lin ◽  
Chia-Rong Lee
Keyword(s):  
Liquid Crystal ◽  
Quantum Dot ◽  
Cholesteric Liquid Crystal ◽  
Azobenzene Moiety ◽  
Optical Stability ◽  
Composite Laser ◽  
Crystal Composite

This work demonstrates the first quantum-dot-embedded cholesteric liquid crystal composite laser with an added chiral-azobenzene moiety which possesses optical stability and reversible tunability.

Optical Stability of Axially Chiral Push-Pull-Substituted Buta-1,3-dienes: Effect of a Single Methyl Group on the C60 Surface

2010 ◽  
Vol 49 (20) ◽  
pp. 3532-3535 ◽  
Author(s):  
Michio Yamada ◽  
Pablo Rivera-Fuentes ◽  
W. Bernd Schweizer ◽  
François Diederich
Keyword(s):  
Methyl Group ◽  
Axially Chiral ◽  
Optical Stability

scholarly journals Perylene Diimide-Based Fluorescent and Colorimetric Sensors for Environmental Detection

Sensors ◽  
2020 ◽  
Vol 20 (3) ◽  
pp. 917 ◽  
Author(s):  
Shuai Chen ◽  
Zexu Xue ◽  
Nan Gao ◽  
Xiaomei Yang ◽  
Ling Zang
Keyword(s):  
Optical Sensors ◽  
Molecular Design ◽  
Environmental Pollutants ◽  
Comprehensive Overview ◽  
Strong Electron ◽  
Environmental Detection ◽  
Optical Stability ◽  
Sensitivity And Selectivity ◽  
Benzene Homologues ◽  
Multi Mode

Perylene tetracarboxylic diimide (PDI) and its derivatives exhibit excellent thermal, chemical and optical stability, strong electron affinity, strong visible-light absorption and unique fluorescence on/off features. The combination of these features makes PDIs ideal molecular frameworks for development in a broad range of sensors for detecting environmental pollutants such as heavy metal ions (e.g., Cu2+, Cd2+, Hg2+, Pd2+, etc.), inorganic anions (e.g., F−, ClO4−, PO4−, etc.), as well as poisonous organic compounds such as nitriles, amines, nitroaromatics, benzene homologues, etc. In this review, we provide a comprehensive overview of the recent advance in research and development of PDI-based fluorescent sensors, as well as related colorimetric and multi-mode sensor systems, for environmental detection in aqueous, organic or mixed solutions. The molecular design of PDIs and structural optimization of the sensor system (regarding both sensitivity and selectivity) in response to varying analytes are discussed in detail. At the end, a perspective summary is provided covering both the key challenges and potential solutions for the future development of PDI-based optical sensors.

scholarly journals Role of hydrodynamic size in colloidal and optical stability of plasmonic Copper nanoparticles

2019 ◽  
Vol 14 (14) ◽  
pp. 1388-1392
Author(s):  
Purnima Sharma ◽  
Dinesh Goyal ◽  
Bhupendra Chudasama
Keyword(s):  
Copper Nanoparticles ◽  
Hydrodynamic Size ◽  
Optical Stability

Preparation of organic–inorganic hybrid methylene blue polymerized organosilane/sepiolite pigments with superhydrophobic and self-cleaning properties

2019 ◽  
Vol 89 (19-20) ◽  
pp. 4220-4229 ◽  
Author(s):  
Shengtao Wu ◽  
Jinliang Huang ◽  
Haishuai Cui ◽  
Tian Ye ◽  
Fang Hao ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Natural World ◽  
Shielding Effect ◽  
Water Repellent ◽  
Inorganic Hybrid ◽  
Lotus Leaf ◽  
Spider Web ◽  
Chemical Inertness ◽  
Optical Stability ◽  
Self Cleaning

Inspired by the self-cleaning and water-repellent properties of the lotus leaf in the natural world, a kind of organic–inorganic hybrid pigment with superhydrophobic properties was prepared by adsorption of cationic methylene blue (MB) azo dyes onto acid-treated sepiolite (SEP), and then a superhydrophobic functional group of polymerized organosilanes (POSs) obtained from hexadecyltrimethoxysilane (HDTMS) and tetraethoxysilane (TEOS) was introduced onto the composite pigments (MB/SEP). The excellent chemical, thermal and optical stability of MB@POS/SEP are due to the shielding effect caused by the chemical inertness of the POS sheet. Furthermore, the superhydrophobic MB@POS/SEP pigments show an extraordinary self-cleaning property, which is similar to the waterproof property of the lotus leaf and spider web. The superhydrophobicity is strongly linked to their chemical composition and morphology, which can be adjusted by varying the concentration of HDTMS and TEOS. This kind of superhydrophobic pigment can be applied in various fields, such as ceramics, building and daily necessities.

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