scholarly journals Carborane photochromism: A fatigue resistant carborane switch

2021 ◽  
Author(s):  
Chong Li ◽  
Matthew Phillip Aldred ◽  
Rachel Abigail Harder ◽  
Chen Ying ◽  
Dimitrii S. Yufit ◽  
...  
Keyword(s):  
Visible Light ◽  
Fatigue Resistance ◽  
High Contrast ◽  
Colour Changes ◽  
Visual Colour

A dithienylethene molecule involving carborane clusters shows remarkable fatigue resistance and high contrast visual colour changes when irradiated with alternating ultraviolet and visible light. The fluorescence of this assembly can...

scholarly journals Analysis of Adsorption and Decomposition of Odour and Tar Components in Tobacco Smoke on Non-Woven Fabric-Supported Photocatalysts

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 304 ◽  
Author(s):  
Tsuyoshi Ochiai ◽  
Daisuke Aoki ◽  
Hidenori Saito ◽  
Yasuhisa Akutsu ◽  
Morio Nagata
Keyword(s):  
Visible Light ◽  
Tobacco Smoke ◽  
Woven Fabric ◽  
Gas Chromatography Mass Spectrometry ◽  
Interior Decoration ◽  
Complete Combustion ◽  
Practical Applications ◽  
Colour Changes ◽  
Subsequent Decomposition ◽  
Component Adsorption

The release of substantial amounts of toxicologically significant, irritant, and malodourous compounds during the complete combustion of tobacco can generate an unpleasant environment, especially indoors. Herein, we developed non-woven fabric-supported UV- and visible-light-responsive photocatalysts capable of adsorbing and decomposing the odour and tar components of tobacco smoke under irradiation with UV or visible light. The processes of odour component adsorption and subsequent decomposition under irradiation were evaluated in terms of colour changes in the catalytic system and by gas chromatography–mass spectrometry. By considering three different photocatalysts, namely TiO2, Fe(III)-grafted TiO2, and Cu(II)-grafted WO3, we assessed the magnitude of odour and tar component adsorption on the fabric fibres, as well as the decomposition of these species after specific visible light or UV irradiation periods. Considering the expansion of our technology for practical applications, the best results among the three tested materials were obtained for non-woven fabric-supported Fe/TiO2. We believe that our technology can be implemented in the design of interior decoration materials for creating a comfortable environment.

The photolysis of polyvinyl bromide

1975 ◽  
Vol 344 (1636) ◽  
pp. 1-19 ◽  
Keyword(s):  
Visible Light ◽  
Cross Linking ◽  
Mercury Lamp ◽  
Primary Reaction ◽  
Colour Changes

Polyvinyl bromide in solution, in dry tetrahydrofuran (THF) yields a black polymer upon exposure to u.v. light of 260 nm or less. This is shown to be the result of ( a ) the elimination of bromine atoms in the primary reaction, and ( b ) the catalysed formation of a conjugated chain by the eliminated bromine atoms. The black polymer is bleached by visible light with the formation of a cross-linked product. This blackening takes place in the full light of the mercury lamp, but by the introduction of a suitable filter passing only visible light, the colour changes can be arrested and ultimately reversed though the viscosity continues to increase due to cross-linking. In dry solutions the liberated bromine is absorbed by the THF solvent and no free Br 2 or HBr is produced. In the presence of water, the products are completely changed. No blackening occurs, free HBr is eliminated, and the colourless PVB becomes cross-linked and ultimately yields a gel. On irradiating the black polymer in aqueous THF by visible light, it becomes bleached, yielding a cross-linked colourless polymer which ultimately gels.

Visible light metasurfaces based on gallium nitride high contrast gratings

2016 ◽  
Vol 367 ◽  
pp. 144-148 ◽  
Author(s):  
Zhenhai Wang ◽  
Shumin He ◽  
Qifa Liu ◽  
Wei Wang
Keyword(s):  
Gallium Nitride ◽  
Visible Light ◽  
High Contrast

scholarly journals Photo-Switchable Aggregation-Induced Emission of Bisthienylethene-Dipyrimido[2,1-b][1,3]benzothiazole Triad

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5382
Author(s):  
Shan-Shan Gong ◽  
Chun-Hong Zheng ◽  
Zhen-Zhen Chen ◽  
Dong-Zhao Yang ◽  
Mei Chi ◽  
...  
Keyword(s):  
Solid State ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Potential Application ◽  
Optical Memory ◽  
Light Irradiation ◽  
Pmma Film ◽  
High Contrast ◽  
Photochromic Properties ◽  
Non Destructive

A bisthienylethene-dipyrimido[2,1-b][1,3]benzothiazole (BTE-2PBT) triad has been designed and synthesized based on our recent discovery of PBTs as atypical propeller-shaped novel AIEgens. The triad not only maintains the photochromic properties of BTE moiety in solution, film, and solid state but also exhibits remarkable AIE properties. Moreover, the fluorescence of BTE-2PBT PMMA film could be modulated with high contrast by alternate UV and visible light irradiation. Photoerasing, rewriting, and non-destructive readout of fluorescent images on BTE-2PBT PMMA film well demonstrate its potential application as optical memory media.

Self-coherent camera: first results of a high-contrast imaging bench in visible light

2010 ◽  
Author(s):  
Marion Mas ◽  
Pierre Baudoz ◽  
Gerard Rousset ◽  
Raphaël Galicher ◽  
Jacques Baudrand
Keyword(s):  
Visible Light ◽  
High Contrast ◽  
Contrast Imaging ◽  
High Contrast Imaging ◽  
First Results

scholarly journals Multi-Sacrificial Bonds Enhanced Double Network Hydrogel with High Toughness, Resilience, Damping, and Notch-Insensitivity

Polymers ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2263
Author(s):  
Manxi Sun ◽  
Jianhui Qiu ◽  
Chunyin Lu ◽  
Shuping Jin ◽  
Guohong Zhang ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Acrylic Acid ◽  
Polyvinyl Alcohol ◽  
Visible Light ◽  
Fatigue Resistance ◽  
Residual Strain ◽  
Double Network ◽  
High Toughness ◽  
Fracture Elongation ◽  
The Common

The engineering applications of hydrogels are generally limited by the common problem of their softness and brittlness. In this study, a composite double network ionic hydrogel (CDN-gel) was obtained by the facile visible light triggered polymerization of acrylic acid (AA), polyvinyl alcohol (PVA), and hydrolyzed triethoxyvinylsilane (TEVS) and subsequent salt impregnation. The resulting CDN-gels exhibited high toughness, recovery ability, and notch-insensitivity. The tensile strength, fracture elongation, Young’s modulus, and toughness of the CDN-gels reached up to ~21 MPa, ~700%, ~3.5 MPa, and ~48 M/m3, respectively. The residual strain at a strain of 200% was only ~25% after stretch-release of 1000 cycles. These properties will enable greater application of these hydrogel materials, especially for the fatigue resistance of tough hydrogels, as well as broaden their applications in damping.

Electron-accepting carborane viologen and iron based-supramolecular polymers for electrochromism and enhanced photocatalytic hydrogen evolution

2020 ◽  
Vol 8 (46) ◽  
pp. 16326-16332
Author(s):  
Xiaodong Yang ◽  
Yueyan Zhang ◽  
Bingjie Zhang ◽  
Sikun Zhang ◽  
Xu Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Optoelectronic Properties ◽  
Supramolecular Polymers ◽  
High Contrast ◽  
Photocatalytic Hydrogen Evolution ◽  
Visible Light Driven ◽  
Iron Based

CbV2+ and its FeSPs with good optoelectronic properties were used to fabricate a high contrast ECD and enhanced visible-light-driven HER.

scholarly journals A Photoswitchable Colorimetric Sensor for Fluoride Based on a Dithienylethene Unit

2018 ◽  
Vol 42 (6) ◽  
pp. 305-308 ◽  
Author(s):  
Ziyong Li ◽  
Honglin Zhang ◽  
Haining Zhang ◽  
Yanfu Xie ◽  
Hong Chen ◽  
...  
Keyword(s):  
Absorption Spectrum ◽  
Carboxylic Acid ◽  
Visible Light ◽  
Fatigue Resistance ◽  
Elemental Analysis ◽  
Colorimetric Sensor ◽  
Anion Receptor ◽  
Photochromic Properties ◽  
Mild Conditions ◽  
Significant Change

A novel dithienylethene amide-based photoswitchable anion receptor was synthesised by amidation of 4,4′-(cyclopent-1-ene-1,2-diyl) bis(5-methylthiophene-2-carboxylic acid) with 4-nitroaniline in 56% yield under mild conditions; its structure was confirmed by NMR, MS and elemental analysis. Investigation of its photochromic properties indicated that 4,4′-(cyclopent-1-ene-1,2-diyl)bis[5-methyl-N-(4-nitrophenyl) thiophene-2-carboxamide] had good reversibility and excellent fatigue resistance upon irradiation with UV or visible light and can serve as a colorimetric sensor for fluoride, resulting in a significant change in the absorption spectrum.

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