Microwave discharge electrodeless lamps (MDEL) : Part VII. Photo-isomerization of trans-urocanic acid in aqueous media driven by UV light from a novel Hg-free Dewar-like microwave discharge thermally-insulated electrodeless lamp (MDTIEL). Performance evaluation

2011 ◽  
Vol 10 (7) ◽  
pp. 1239 ◽  
Author(s):  
Satoshi Horikoshi ◽  
Tatsuro Sato ◽  
Kazutami Sakamoto ◽  
Masahiko Abe ◽  
Nick Serpone
Keyword(s):  
Performance Evaluation ◽  
Microwave Discharge ◽  
Uv Light ◽  
Aqueous Media ◽  
Urocanic Acid ◽  
Electrodeless Lamp

Degradation of Active Brilliant Red X‐3B by a microwave discharge electrodeless lamp in the presence of activated carbon

2010 ◽  
Vol 31 (7) ◽  
pp. 771-779 ◽  
Author(s):  
Jie Fu ◽  
Teng Wen ◽  
Qing Wang ◽  
Xue‐Wei Zhang ◽  
Qing‐Fu Zeng ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Microwave Discharge ◽  
Electrodeless Lamp

UV light and urocanic acid

1996 ◽  
Vol 6 (SUPPLEMENT 1) ◽  
pp. S24
Author(s):  
F. de Fine Olivarius ◽  
H. C. Wulf ◽  
J. Crosby ◽  
M. Norval
Keyword(s):  
Uv Light ◽  
Urocanic Acid

Triply-Responsive Poly(N,N-Dimethylaminoethyl Mathacrylate) with an Azobenzene Moiety

2010 ◽  
Vol 663-665 ◽  
pp. 1049-1052
Author(s):  
Xin De Tang ◽  
Xin Wang ◽  
Yuan Yuan Dou
Keyword(s):  
Uv Light ◽  
Aqueous Media ◽  
Gel Permeation Chromatography ◽  
Terminal Group ◽  
Light Irradiation ◽  
Solution Temperature ◽  
Critical Solution Temperature ◽  
Molecular Weights ◽  
Azobenzene Moiety ◽  
Azobenzene Group

A serious of triply-responsive poly(N,N-dimethylaminoethyl methacrylate) (PMAEMA) containing an azobenzene group as the terminal group were synthesized by atom transfer radical polymerization (ATRP). The ATRP process of DMAEMA was initiated by an azobenzene derivative substituted with a 2-bromoisobutyryl group (Azo-Br) using CuCl/Me6TREN as catalyst and the mixture of DMA and H2O (v/v = 3:1) as solvent. The molecular weights and their distributions of the resulting homopolymers (Azo-PDMAEMA) were characterized by gel permeation chromatography (GPC). The polymers are soluble in aqueous media and exhibit a lower critical solution temperature (LCST) that alternated reversibly in response to pH and photoisomerization of the terminal azobenzene moiety. It was found that the LCST increased as pH decreased in the range of testing. Under UV light irradiation, the trans-to-cis photoisomerization of the azobenzene moiety resulted in a higher LCST, while it recovered under visible light irradiation.

scholarly journals Titanium Dioxide Nanoparticles – Prospects and Applications in Medicine

2020 ◽  
Author(s):  
Daniel Ziental ◽  
Beata Czarczynska-Goslinska ◽  
Dariusz T. Mlynarczyk ◽  
Arleta Glowacka-Sobotta ◽  
Beata Stanisz ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Metallic Nanoparticles ◽  
Malignant Tumors ◽  
Uv Light ◽  
Titanium Dioxide Nanoparticles ◽  
Aqueous Media ◽  
Resistant Bacteria ◽  
Antibiotic Resistant ◽  
Tio2 Nps ◽  
Wide Range

Metallic nanoparticles (NPs), among polymeric NPs, liposomes, micelles, quantum dots, dendrimers, or fullerenes, are becoming more and more important due to their potential use in the novel medical therapies. Titanium dioxide (titanium(IV) oxide, titania, TiO2) is an inorganic compound that owes its recent rise in scientific interest to photoactivity. After the illumination in aqueous media with UV light, TiO2 produces an array of reactive oxygen species (ROS). The capability to produce ROS and thus induce cell death has found application in the photodynamic therapy (PDT) for the treatment of a wide range of maladies, from psoriasis to cancer. Titanium dioxide NPs were studied as photosensitizing agents in the treatment of malignant tumors as well as in photodynamic inactivation of antibiotic-resistant bacteria. Both TiO2 NPs themselves, as well as their composites with other molecules, can be successfully used as photosensitizers in PDT. Moreover, various organic compounds can be grafted on TiO2 NPs, leading to hybrid materials. These nanostructures can reveal increased light absorption allowing their further use in targeted therapy in medicine. In order to improve efficient anticancer therapy, many approaches utilizing titanium dioxide were tested. The most significant studies are discussed in this review.

Color Transition Properties of Water Dispersible Polydiacetylene Particles Conjugated with the Thermosensitive Polymer

2017 ◽  
Vol 863 ◽  
pp. 38-43
Author(s):  
Izumi Harano ◽  
Chigusa Okano ◽  
Yuriko Takayama ◽  
Eri Nasuno ◽  
Ken-ichi Iimura ◽  
...  
Keyword(s):  
Color Change ◽  
Uv Light ◽  
Aqueous Media ◽  
Polymerization Reaction ◽  
Solution Temperature ◽  
Thermosensitive Polymer ◽  
Critical Solution Temperature ◽  
Color Transition ◽  
Water Dispersible ◽  
System A

An assembly of diacetylene molecules is necessary to progress a topochemical reaction as UV-irradiated polymerization. In this study, we attempt to regularly assemble 10, 12- pentacosadiynoic acid (PCDA) by freezing the solution, followed by lyophilization. Dried PCDA assembly was easily dispersed in aqueous solution by sonication. Irradiation of UV light can promote polymerization reaction of PCDA judging from a color change of the solution into blue. A color transition of the polyPCDA-dispersed solution from blue to red was observed at approximately 56°C due to distortion of its π-conjugated system. A color transition temperature could be controlled by hybridization with thermosensitive hydroxypropyl cellulose, of which lower critical solution temperature appears around 38-39°C. By synchronizing to coli-globule transition of HPC in aqueous media, blue-red transition response of water-dispersed polyPCDA could be induced by changing conformation of surrounded polymer.

Microwave discharge electrodeless lamps (MDELs). Part IX. A novel MDEL photoreactor for the photolytic and chemical oxidation treatment of contaminated wastewaters

2015 ◽  
Vol 14 (12) ◽  
pp. 2187-2194 ◽  
Author(s):  
Satoshi Horikoshi ◽  
Akihiro Tsuchida ◽  
Tomohiro Shinomiya ◽  
Nick Serpone
Keyword(s):  
Microwave Discharge ◽  
Chemical Oxidation ◽  
Oxidation Treatment ◽  
E Coli ◽  
Microwave Assisted ◽  
Electrodeless Lamp

A novel microwave discharge electrodeless lamp (MDEL) with enhanced performance was fabricated for the microwave-assisted remediation of wastewaters contaminated with the 2,4-D herbicide and such microorganisms as E coli.

scholarly journals Quasi-homogenous photocatalysis of quantum-sized Fe-doped TiO2 in optically transparent aqueous dispersions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Marcus Einert ◽  
Pascal Hartmann ◽  
Bernd Smarsly ◽  
Torsten Brezesinski
Keyword(s):  
Surface Defects ◽  
Uv Light ◽  
Sol Gel ◽  
Aqueous Media ◽  
Catalytic Performance ◽  
Defect States ◽  
Adsorption Sites ◽  
Photoelectrochemical Characterization ◽  
Shallow Defect ◽  
Pre Treatment

AbstractIn this study, the preparation of anatase TiO2 nanocrystals via a facile non-aqueous sol–gel route and their characterization are reported. The 3–4 nm particles are readily dispersable in aqueous media and show excellent photoreactivity in terms of rhodamine B degradation. The catalytic performance can be further increased considerably by doping with iron and UV-light irradiation as a pre-treatment. The effect of surface ligands (blocked adsorption sites, surface defects etc.) on the photoreactivity was thoroughly probed using thermogravimetric analysis combined with mass spectrometry. Photoelectrochemical characterization of thin-film electrodes made from the same TiO2 nanocrystals showed the opposite trend to the catalytic experiments, that is, a strong decrease in photocurrent and quantum efficiency upon doping due to introduction of shallow defect states.

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