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1. Synthesis of ternary oxide Zn₂GeO₄ nanowire networks and their deep ultraviolet detection properties

Author:
Han, Xu; Feng, Shuanglong; Zhao, Yiming; Li, Lei; Zhan, Zhaoyao; Tao, Zhiyong; Fan, Yaxian; Lu, Wenqiang; Zuo, Wenbin; Fu, Dejun
Source:
RSC advances 2019 v.9 no.3 pp. 1394-1402
ISSN:
2046-2069
Subject:
ultraviolet radiation,   etc   ; nanowires; semiconductors; vapors;     Show all 4 Subjects
Abstract:
... Ternary oxide Zn₂GeO₄ with a wide bandgap of 4.84 eV, as a candidate for fourth generation semiconductors, has attracted a great deal of attention for deep ultraviolet (DUV) photodetector applications, because it is expected to be blind to the UV-A/B band (290–400 nm) and only responsive to the UV-C band (200–290 nm). Here, we report on the synthesis of Zn₂GeO₄ nanowire (NW) networks by lower pres ...
DOI:
10.1039/c8ra09307e

2. Y₈O(OH)₁₅(CO₃)₃Cl: an excellent short-wave UV nonlinear optical material exhibiting an infrequent three-dimensional inorganic cationic framework

Author:
Zhang, Yiting; Long, Ying; Dong, Xuehua; Wang, Lei; Huang, Ling; Zeng, Hongmei; Lin, Zhien; Wang, Xin; Zou, Guohong
Source:
Chemical communications 2019 v.55 no.31 pp. 4538-4541
ISSN:
1364-548X
Subject:
ultraviolet radiation,   etc   ; anions; carbonates; chemical reactions;     Show all 4 Subjects
Abstract:
... A novel compound with four mixed anions, Y₈O(OH)₁₅(CO₃)₃Cl, exhibiting an infrequent three-dimensional (3-D) inorganic cationic framework, has been successfully designed and synthesized by introducing π-conjugated planar triangular CO₃ groups and chloride anions into a rare earth oxide system, which exhibits good balance among its wide UV transmission range, large second harmonic generation (SHG) ...
DOI:
10.1039/c9cc00581a

3. Circularly polarized light modulated supramolecular self-assembly for an azobenzene-based chiral gel

Author:
Shao, Kenan; Lv, Ziyu; Xiong, Yuting; Li, Guodong; Wang, Dongdong; Zhang, Haining; Qing, Guangyan
Source:
RSC advances 2019 v.9 no.18 pp. 10360-10363
ISSN:
2046-2069
Subject:
ultraviolet radiation,   etc   ; gels; light; optical isomerism;     Show all 4 Subjects
Abstract:
... UV light-triggered trans-to-cis isomerization of azobenzene usually results in the collapse of a self-assembly system owing to the breaking of molecular planarity. Interestingly, two totally opposite self-assembly trends have been detected when a C₂ᵥ-symmetric chiral gelator was irradiated by a circularly polarized light (CPL) with specific handedness, indicating that CPL could become a powerful t ...
DOI:
10.1039/c9ra01974j

4. A prior shape-based level-set method for auroral oval segmentation

Author:
Meng, Yong; Zhou, Zeming; Liu, Yudi; Luo, Qixiang; Yang, Pinglv; Li, Miaoying
Source:
Remote sensing letters 2019 v.10 no.3 pp. 292-301
ISSN:
2150-7058
Subject:
ultraviolet radiation,   etc   ; image analysis; remote sensing;     Show all 3 Subjects
Abstract:
... Low-contrast and dayglow contamination pose a challenge to the accurate contour extraction of the auroral oval captured by the ultraviolet imager (UVI). To address the segmentation difficulties, a novel prior shape-based level-set method (PSLSM) is proposed by introducing prior knowledge into the variational framework. Firstly, driven by the local information term and the distance constraint term, ...
DOI:
10.1080/2150704X.2018.1547928

5. Quantifying the effects of a low-ozone event and shallow stratocumulus clouds on ultraviolet erythemal radiation exposure

Author:
Kelbch, A.; Wittlich, M.; Bott, A.
Source:
International journal of biometeorology 2019 v.63 no.3 pp. 359-369
ISSN:
0020-7128
Subject:
ultraviolet radiation,   etc   ; bioclimatology; erythema; ozone; stratosphere; England;     Show all 6 Subjects
Abstract:
... Meteorological and dosimetric ultraviolet (UV) erythemal radiation (UVER) measurements were performed in Didcot, England, on 6 and 7 April 2017. Both days were characterized by clear-sky conditions in the morning and the afternoon with development of shallow stratocumulus clouds (SSC) around noon. In addition, a low-ozone event occurred on 7 April characterized by a 34 DU (Dobson Unit) drop in tot ...
DOI:
10.1007/s00484-018-01669-8

6. Self-Propelled Motion of a Camphor Disk on a Photosensitive Amphiphilic Molecular Layer

Author:
Nakata, Satoshi; Nasu, Kyoko; Irie, Yasutaka; Hatano, Sayaka
Source:
Langmuir 2019 v.35 no.12 pp. 4233-4237
ISSN:
1520-5827
Subject:
ultraviolet radiation,   etc   ; camphor; irradiation; photochemical reactions; photosensitivity;     Show all 5 Subjects
Abstract:
... We have studied the self-propelled motion of a camphor disk on a 2,2′-bis(2-chlorophenyl)-4,4′,5,5′-tetraphenyl-1,2′-biimidazole (o-Cl-HABI) molecular layer, which was developed on water, as a photomechanical sensing system. The o-Cl-HABI dimer changed to its monomeric form upon UV light irradiation, and as a result, the surface pressure of the o-Cl-HABI molecular layer decreased. The reciprocatin ...
DOI:
10.1021/acs.langmuir.8b04285

7. Tuning the Luminescence of Layered Halide Perovskites

Author:
Smith, Matthew D.; Connor, Bridget A.; Karunadasa, Hemamala I.
Source:
Chemical reviews 2019 v.119 no.5 pp. 3104-3139
ISSN:
1520-6890
Subject:
ultraviolet radiation,   etc   ; color; infrared radiation; photoluminescence;     Show all 4 Subjects
Abstract:
... Layered halide perovskites offer a versatile platform for manipulating light through synthetic design. Although most layered perovskites absorb strongly in the ultraviolet (UV) or near-UV region, their emission can range from the UV to the infrared region of the electromagnetic spectrum. This emission can be very narrow, displaying high color purity, or it can be extremely broad, spanning the enti ...
DOI:
10.1021/acs.chemrev.8b00477

8. Phototriggered Dynamic and Biomimetic Growth of Chlorosomal Self-Aggregates

Author:
Matsubara, Shogo; Tamiaki, Hitoshi
Source:
Journal of the American Chemical Society 2019 v.141 no.3 pp. 1207-1211
ISSN:
1520-5126
Subject:
ultraviolet radiation,   etc   ; bacteria; biomimetics; chlorophyll; photosynthesis; polymerization;     Show all 6 Subjects
Abstract:
... Supramolecular polymerizations mimicking native systems, which are step-by-step constructions to form self-aggregates, were recently developed. However, a general system to successively and spontaneously form self-aggregates from monomeric species remains challenging. Here, we report a photoinduced supramolecular polymerization system as a biomimetic formation of chlorophyll aggregates which are t ...
DOI:
10.1021/jacs.8b13056

9. Triplet-sensitised di-π-methane rearrangement of N-substituted 2-azabarrelenones

Author:
Tröster, Andreas; Bach, Thorsten
Source:
Chemical communications 2019 v.55 no.3 pp. 302-305
ISSN:
1364-548X
Subject:
ultraviolet radiation,   etc   ; chemical compounds; chemical reactions;     Show all 3 Subjects
Abstract:
... When irradiated at λ = 366 nm or at λ = 420 nm in the presence of an appropriate sensitiser the title compounds underwent a di-π-methane rearrangement which led to the formation of tricyclic azasemibullvalenones (2a,2a¹,2b,4a-tetrahydroazacyclopropa[cd]pentalenones) in yields of 63–87%. ...
DOI:
10.1039/c8cc08704k

10. Assessment of UV radiation emitted by linear fluorescent lamps in Iran

Author:
Dehghani, Mohammad Hadi; Bazargani, Azam; Mirdoraghi, Mohammad
Source:
MethodsX 2019 v.6 pp. 477-481
ISSN:
2215-0161
Subject:
ultraviolet radiation,   etc   ; fluorescent lamps; wavelengths; Iran;     Show all 4 Subjects
Abstract:
... The aim of the study was to evaluate ultraviolet (UV) radiation emitted from linear fluorescent lamps widely used in Iran. This study was conducted on 40 linear fluorescent lamps (15 different brands) with different wattages. The UV radiation was measured at 2, 5, 20, 50, 150 cm for one, 5, 30, 60 min in 2 spectral values i.e. UVC (100 ≤ wavelength ≤ 280) and UVA (300 ≤ wavelength ≤ 400). Data ana ...
DOI:
10.1016/j.mex.2019.02.031

11. Selective and sensitive spectrofluorimetric quantification of velpatasvir in presence of sofosbuvir. Application to their co-formulated tablet

Author:
El-Gamal, Rania M.; Abdel-Gawad, Sherif A.; Belal, Fathalla F.; Moustapha, Moustapha E.
Source:
RSC advances 2018 v.8 no.57 pp. 32909-32915
ISSN:
2046-2069
Subject:
ultraviolet radiation,   etc   ; fluorescence; methanol;     Show all 3 Subjects
Abstract:
... A new sensitive, rapid and simple spectrofluorimetric method was utilized for the assessment of velpatasvir (VPS) in its bulk form as well as in its combined tablet with sofosbovir (SFV). The technique relies on measuring the native fluorescence of VPS in methanol at 385 nm and 400 nm after excitation at 295 nm. The fluorescence–concentration plots were rectilinear through the range of 2.0–20.0 ng ...
DOI:
10.1039/c8ra06588h

12. UV-mediated hydrophosphinylation of unactivated alkenes with phosphinates under batch and flow conditions

Author:
Gelat, Fabien; Roger, Maxime; Penverne, Christophe; Mazzad, Ahmed; Rolando, Christian; Chausset-Boissarie, Laëtitia
Source:
RSC advances 2018 v.8 no.15 pp. 8385-8392
ISSN:
2046-2069
Subject:
ultraviolet radiation,   etc   ; alkenes; catalysts;     Show all 3 Subjects
Abstract:
... A UV-mediated hydrophosphinylation of unactivated alkenes with H-phosphinates and hypophosphorous acid under radical free conditions is presented. The reaction affords selectively a large number of structurally diverse organophosphorous compounds in moderate to good yields under mild reaction conditions in the presence of an organic sensitizer as catalyst irradiated by UV-A LEDs. Furthermore, the ...
DOI:
10.1039/c7ra12977g

13. Examine all available evidence before making decisions on sunscreen ingredient bans

Author:
Sirois, Jay
Source:
The Science of the total environment 2019 v.674 pp. 211-212
ISSN:
0048-9697
Subject:
ultraviolet radiation,   etc   ; coral bleaching; coral reefs; ingredients; sunscreens;     Show all 5 Subjects
Abstract:
... Coral bleaching is a worldwide problem and more needs to be done to determine causes and potential solutions. A myopic focus on sunscreen ingredients as the proximate cause of coral bleaching provides consumers a false belief that enacted bans of these ingredients will erase decades of coral reef decline. Instead, these bans will likely only lead to decreased sunscreen use and exposure to potentia ...
DOI:
10.1016/j.scitotenv.2019.04.137

14. Selecting the best piping arrangement for scaling-up an annular channel reactor: An experimental and computational fluid dynamics study

Author:
Moreira, Francisca C.; Bocos, Elvira; Faria, Ana G.F.; Pereira, Joana B.L.; Fonte, Cláudio P.; Santos, Ricardo J.; Lopes, José Carlos B.; Dias, Madalena M.; Sanromán, M.A.; Pazos, M.; Boaventura, Rui A.R.; Vilar, Vítor J.P.
Source:
The Science of the total environment 2019 v.667 pp. 821-832
ISSN:
0048-9697
Subject:
ultraviolet radiation,   etc   ; aqueous solutions; hydrodynamics; models; pipes; remediation; wastewater;     Show all 7 Subjects
Abstract:
... This study is focused on the selection of the best piping arrangement for a pilot scale annular channel reactor intended for the remediation of waters and wastewaters. Two annular channel reactors composed of a single UV lamp and distinct piping arrangements were considered: (i) a novel reactor with tangential inlet/outlet pipes – the FluHelik reactor, and (ii) a conventional Jets reactor. These t ...
DOI:
10.1016/j.scitotenv.2019.02.260

15. Photocontrolled morphological conversion and chiral transfer of a snowflake-like supramolecular assembly based on azobenzene-bridged bis(dibenzo-24-crown-8) and a cholesterol derivative

Author:
Wang, Hui-Juan; Zhang, Heng-Yi; Wu, Huang; Dai, Xian-Yin; Li, Pei-Yu; Liu, Yu
Source:
Chemical communications 2019 v.55 no.31 pp. 4499-4502
ISSN:
1364-548X
Subject:
ultraviolet radiation,   etc   ; chemical reactions; cholesterol; circular dichroism spectroscopy;     Show all 4 Subjects
Abstract:
... A snowflake-like supramolecular clockwise-helical assembly was fabricated via the host–guest interaction of trans-azobenzene-bridged bis(dibenzo-24-crown-8) (trans-1) and a cholesterol derivative, while a snowflake-like supramolecular non-helical assembly can be obtained upon complexation of cis-1 after UV-irradiation, accompanying the disappearance of circular dichroism signals from the azobenzen ...
DOI:
10.1039/c9cc01874c

16. Self-Assembly of Single Chain Janus Nanoparticles with Tunable Liquid Crystalline Properties from Stilbene-Containing Block Copolymers

Author:
Wen, Wei; Huang, Tianyu; Guan, Song; Zhao, Yongbin; Chen, Aihua
Source:
Macromolecules 2019 v.52 no.8 pp. 2956-2964
ISSN:
1520-5835
Subject:
ultraviolet radiation,   etc   ; composite polymers; crosslinking; liquids; nanoparticles; transmission electron microscopy;     Show all 6 Subjects
Abstract:
... Functional particles self-assembled from polymer single chain nanoparticles have potential applications in various fields, but functionality incorporation is difficult due to their ultrasmall sizes. Here, the preparation and self-assembly of amphiphilic polymer single chain Janus nanoparticles (SCJNPs) with tunable liquid crystalline (LC) properties are reported via intrachain photo-cross-linking ...
DOI:
10.1021/acs.macromol.9b00154

17. Investigation into reactions of methyl methacrylate and ethyl acrylate with chlorine atom

Author:
Lin, Xuan; Li, Zhaohui; Yu, Yepeng; Chen, Jun; Meng, Qinghui; Zhang, Hang; Shan, Xiaobin; Liu, Fuyi; Sheng, Liusi
Source:
Chemosphere 2019 v.221 pp. 263-269
ISSN:
0045-6535
Subject:
ultraviolet radiation,   etc   ; chlorine; energy; esters; gases; ionization; isomers; spectrometers;     Show all 8 Subjects
Abstract:
... Reactions between chlorine and unsaturated esters in gas phase are examined in a slow-flow reaction tube inside the laboratory-built photoionization mass spectrometer at the energy range of 8–11 eV. 248 nm laser radiation is used to initiate the reaction. Products are distinguished, C5H8O2Cl for addition, and C5H7O2, C5H7O2Cl and C5H9O2Cl for abstraction. The direct or indirect products are detect ...
DOI:
10.1016/j.chemosphere.2018.12.202

18. Facile and Microcontrolled Blade Coating of Organic Semiconductor Blends for Uniaxial Crystal Alignment and Reliable Flexible Organic Field-Effect Transistors

Author:
Kim, Kyunghun; Hong, Jisu; Hahm, Suk Gyu; Rho, Yecheol; An, Tae Kyu; Kim, Se Hyun; Park, Chan Eon
Source:
ACS applied materials & interfaces 2019 v.11 no.14 pp. 13481-13490
ISSN:
1944-8252
Subject:
ultraviolet radiation,   etc   ; coatings; crystal structure; crystals; hydrophobicity; polyurethanes; solvents; transistors;     Show all 8 Subjects
Abstract:
... The ability to fabricate uniform and high-quality patterns of organic semiconductors using a simple method is necessary to realize high-performance and reliable organic field-effect transistors (OFETs) for practical applications. Here, we report the facile fabrication of chemically patterned substrates in order to provide solvent wetting/dewetting regions and grow patterned crystals during blade c ...
DOI:
10.1021/acsami.8b21130

19. Photopolymerization of maleimide perfluoropolyalkylethers without a photoinitiator

Author:
Bonneaud, Céline; Burgess, Julia M.; Bongiovanni, Roberta; Joly‐Duhamel, Christine; Friesen, Chadron M.
Source:
Journal of polymer science 2019 v.57 no.6 pp. 699-707
ISSN:
0887-624X
Subject:
ultraviolet radiation,   etc   ; air; coatings; molecular weight; polymerization; polymers;     Show all 6 Subjects
Abstract:
... Perfluoropolyalkylethers derived from hexafluoropropylene oxide were functionalized with maleimide groups. Irradiated by UV‐light, the new maleimide macromonomers demonstrated very fast polymerization kinetics with a curing time as fast as 8 s. The effect on photopolymerization of different features such as the molecular weight of the fluorinated chain and the chain length of the hydrogenated spac ...
DOI:
10.1002/pola.29311

20. Endowing a Light-Inert Aqueous Surfactant Two-Phase System with Photoresponsiveness by Introducing a Trojan Horse

Author:
Yu, Menghong; Liu, Zihao; Du, Yichen; Ma, Cheng; Yan, Yun; Huang, Jianbin
Source:
ACS applied materials & interfaces 2019 v.11 no.16 pp. 15103-15110
ISSN:
1944-8252
Subject:
ultraviolet radiation,   etc   ; encapsulation; light; mixing; quaternary ammonium compounds; sodium; surfactants;     Show all 7 Subjects
Abstract:
... The ability to modulate the phase behavior of an aqueous surfactant two-phase (ASTP) system reversibly with light is of great importance in both fundamental and applied science. Thus far, most of the light-responsive ASTP systems are based on covalent modification of the component molecules. In this article, we, for the first time, achieve photoresponsiveness in a light-inert ASTP system by physic ...
DOI:
10.1021/acsami.8b20817