Diselenide mediated controlled radical polymerization under visible light irradiation: mechanism investigation and α,ω-ditelechelic polymers

2015 ◽  
Vol 6 (35) ◽  
pp. 6416-6423 ◽  
Author(s):  
Chunlai Ding ◽  
Caiwei Fan ◽  
Ganquan Jiang ◽  
Jiandong Zhang ◽  
Xiaohong Li ◽  
...  
Keyword(s):  
Visible Light ◽  
Radical Polymerization ◽  
Benzene Ring ◽  
Visible Light Irradiation ◽  
Controlled Radical Polymerization ◽  
Light Irradiation

The radical polymerization of styrene was investigated in the presence of five diaryl diselenide compounds with different groups on the benzene ring under visible light irradiation.

scholarly journals Self-strengthening hybrid dental adhesive via visible-light irradiation triple polymerization

RSC Advances ◽  
2016 ◽  
Vol 6 (57) ◽  
pp. 52434-52447 ◽  
Author(s):  
Linyong Song ◽  
Qiang Ye ◽  
Xueping Ge ◽  
Anil Misra ◽  
Candan Tamerler ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Visible Light Irradiation ◽  
Cationic Polymerization ◽  
Sol Gel ◽  
Free Radical Polymerization ◽  
Light Irradiation ◽  
Dental Adhesive ◽  
Polymerization System

An integrated triple polymerization system containing free radical polymerization, cationic polymerization, and photoacid-induced sol–gel reaction was designed and successfully applied to develop dental adhesive capable of self-strengthening property in wet environments.

Visible-light induced controlled radical polymerization of methacrylates with Cu(dap)2Cl as a photoredox catalyst

2016 ◽  
Vol 7 (25) ◽  
pp. 4226-4236 ◽  
Author(s):  
Wenchao Ma ◽  
Dong Chen ◽  
Yuhong Ma ◽  
Li Wang ◽  
Changwen Zhao ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Block Copolymers ◽  
Visible Light ◽  
Radical Polymerization ◽  
Visible Light Irradiation ◽  
Controlled Radical Polymerization ◽  
Molecular Weights ◽  
Molecular Weight Distributions ◽  
System P ◽  
Weight Distributions

Under visible light irradiation, block copolymers of PPEGMA-b-PMMA with high molecular weights and narrow molecular weight distributions are obtained starting from a PPEGMA macroinitiator in the presence of the Cu(dap)2Cl/Me6TREN catalytic system.

Straightforward catalyst/solvent-free iodine-mediated living radical polymerization of functional monomers driven by visible light irradiation

2016 ◽  
Vol 52 (72) ◽  
pp. 10850-10853 ◽  
Author(s):  
Xiaodong Liu ◽  
Lifen Zhang ◽  
Zhenping Cheng ◽  
Xiulin Zhu
Keyword(s):  
Visible Light ◽  
Radical Polymerization ◽  
Visible Light Irradiation ◽  
Living Radical Polymerization ◽  
Solvent Free ◽  
Light Irradiation ◽  
Efficient Catalyst ◽  
Functional Monomers ◽  
Polymerization System ◽  
Free Iodine

A simple and highly efficient catalyst/solvent-free iodine-mediated polymerization system for functional monomers (DMAEMA, PEGMA and GMA) was successfully developed under irradiation of visible light or sunlight.

Cu Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity and High Temperature Anatase Stability

2018 ◽  
Author(s):  
Snehamol Mathew ◽  
Priyanka Ganguly ◽  
Stephen Rhatigan ◽  
Vignesh Kumaravel ◽  
Ciara Byrne ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Density Functional ◽  
Anatase Phase ◽  
Sol Gel ◽  
Chemical Properties ◽  
Light Irradiation ◽  
Health Concern ◽  
Bacterial Inactivation ◽  
X Ray

Indoor surface contamination by microbes is a major public health concern. A damp environment is one potential sources for microbe proliferation. Smart photocatalytic coatings on building surfaces using semiconductors like titania (TiO<sub>2</sub>) can effectively curb this growing threat.<b> </b>Metal-doped titania in anatase phase has been proved as a promising candidate for energy and environmental applications. In this present work, the antimicrobial efficacy of copper (Cu) doped TiO<sub>2 </sub>(Cu-TiO<sub>2</sub>) was evaluated against <i>Escherichia coli</i> (Gram-negative) and <i>Staphylococcus aureus</i> (Gram-positive) under visible light irradiation. Doping of a minute fraction of Cu (0.5 mol %) in TiO<sub>2 </sub>was carried out <i>via</i> sol-gel technique. Cu-TiO<sub>2</sub> further calcined at various temperatures (in the range of 500 °C – 700 °C) to evaluate the thermal stability of TiO<sub>2</sub> anatase phase. The physico-chemical properties of the samples were characterised through X-ray diffraction (XRD), Raman spectroscopy, X-ray photo-electron spectroscopy (XPS) and UV-visible spectroscopy techniques. XRD results revealed that the anatase phase of TiO<sub>2</sub> was maintained well, up to 650 °C, by the Cu dopant. UV-DRS results suggested that the visible light absorption property of Cu-TiO<sub>2 </sub>was enhanced and the band gap is reduced to 2.8 eV. Density functional theory (DFT) studies emphasises the introduction of Cu<sup>+</sup> and Cu<sup>2+</sup> ions by replacing Ti<sup>4+</sup> ions in the TiO<sub>2</sub> lattice, creating oxygen vacancies. These further promoted the photocatalytic efficiency. A significantly high bacterial inactivation (99.9%) was attained in 30 mins of visible light irradiation by Cu-TiO<sub>2</sub>.

Semiconductor Photocatalysts for Solar-to-Hydrogen Energy Conversion: Recent Advances of CdS

2020 ◽  
Vol 16 ◽  
Author(s):  
Yuxue Wei ◽  
Honglin Qin ◽  
Jinxin Deng ◽  
Xiaomeng Cheng ◽  
Mengdie Cai ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Water Splitting ◽  
Visible Light Irradiation ◽  
Noble Metals ◽  
Light Irradiation ◽  
Photocatalytic Hydrogen Evolution ◽  
Theoretical Design ◽  
Recent Developments

Introduction: Solar-driven photocatalytic hydrogen production from water splitting is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. In this review, recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. In particular, the factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Background: Photocatalytic hydrogen evolution from water splitting using photocatalyst semiconductors is one of the most promising solutions to satisfy the increasing demands of a rapidly developing society. CdS has emerged as a representative semiconductor photocatalyst due to its suitable band gap and band position. However, the poor stability and rapid charge recombination of CdS restrict its application for hydrogen production. The strategy of using a cocatalyst is typically recognized as an effective approach for improving the activity, stability, and selectivity of photocatalysts. Methods: This review summarizes the recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation. Results: Recent developments in CdS cocatalysts for hydrogen production from water splitting under visible-light irradiation are summarized. The factors affecting the photocatalytic performance and new cocatalyst design, as well as the general classification of cocatalysts, are discussed, which includes a single cocatalyst containing noble-metal cocatalysts, non-noble metals, metal-complex cocatalysts, metal-free cocatalysts, and multi-cocatalysts. Finally, future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are described. Conclusion: The state-of-the-art CdS for producing hydrogen from photocatalytic water splitting under visible light is discussed. The future opportunities and challenges with respect to the optimization and theoretical design of cocatalysts toward the CdS photocatalytic hydrogen evolution are also described.

Spatial separation of dual-cocatalysts on bismuth vanadate for selective aerobic oxidation of benzylalcohols to benzaldehydes under visible light irradiation

2018 ◽  
Vol 8 (23) ◽  
pp. 6173-6179 ◽  
Author(s):  
Xu Jin ◽  
Rengui Li ◽  
Yue Zhao ◽  
Xiaodan Liu ◽  
Xiaoqi Wang ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Aerobic Oxidation ◽  
Spatial Separation ◽  
Bismuth Vanadate ◽  
Light Irradiation ◽  
Selective Aerobic Oxidation

Efficient converting of alcohols to aldehydes under visible light can be achieved on BiVO4 crystals with spatial separation of dual-cocatalysts.

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