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Plasma-electrochemical synthesis of europium doped cerium oxide nanoparticles

Frontiers of Chemical Science and Engineering 2019年第3期13卷 501-510页

作者： Liangliang Lin Xintong Ma Sirui Li Marly Wouters Volker Hessel School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China Micro Flow Chemistry and Process Technology Chemical Engineering and Chemistry DepartmentEindhoven University of Technology5600 MB Eindhoventhe Netherlands School of Chemical Engineering The University of AdelaideSouth Australia 5005Australia

In the present study,a plasma-electrochemical method was demonstrated for the synthesis of europium doped ceria ***(NO3)3· 6H2O and Eu(NO3)3·5H2O were used as the starting materials and being dissolved in the distilled water as the electrolyte *** plasma-liquid interaction process was in-situ investigated by an optical emission spectroscopy,and the obtained products were characterized by complementary analytical *** showed that crystalline cubic CeO2:Eu3+ nanoparticles were successfully obtained,with a particle size in the range from 30 to 60 *** crystal structure didn't change during the calcination at a temperature from 400℃ to 1000℃,with the average erystallite size being estimated to be 52 nm at 1000℃.Eu3+ ions were shown to be effectively and uniformly doped into the CeO2 *** a result,the obtained nanophosphors emit apparent red color under the UV irradiation,which can be easily observed by naked *** photoluminescence spectrum further proves the downshift behavior of the obtained products,where characteristic 5Do → 7F1,2,3 transitions of Eu3+ ions had been *** to the simple,flexible and environmental friendly process,this plasma-electrochemical method should have great potential for the synthesis of a series of nanophosphors,especially for bio-application purpose.

关键词： plasma-electrochemical method europium doped ceria rare earth nanoparticles photoluminescence

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Scale-up of micro- and milli-reactors: An overview of strategies, design principles and applications

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Chemical Engineering Science: X 2021年 10卷

作者： Dong, Zhengya Wen, Zhenghui Zhao, Fang Kuhn, Simon Noël, Timothy Micro Flow Chemistry and Synthetic Methodology Department of Chemical Engineering and Chemistry Eindhoven University of Technology Het Kranenveld Bldg 14 – Helix MB Eindhoven5600 Netherlands KU Leuven Department of Chemical Engineering Celestijnenlaan 200F Leuven3001 Belgium

Continuous-flow microreactor technology has been embraced by researchers in academia and industry due to its excellent transport properties and the increased safety and control over challenging chemical transformations. Despite its popularity, scaling the benefits associated with the microenvironment has proven to be a daunting challenge. This review provides an up-to-date overview concerning the different scale-up approaches of micro/milli-reactors, including numbering up (both internal and external), sizing up (increasing length, geometry similarity and constant pressure drop strategies) and a combination of numbering up and sizing up. The strategies, design principles and applications of each approach have been discussed in detail. Each scale-up approach has its merits and limitations. However, scale-up factors, that are required in the fine chemical and pharmaceutical industry, are within reach when different scale-up approaches are combined. © 2021 The Author(s)

关键词： Chemical reactors

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Determining photon flux and effective optical path length in intensified flow photoreactors

Nature Chemical Engineering

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Nature Chemical Engineering 2024年 462-471页

作者： Stefan D. A. Zondag Jasper H. A. Schuurmans Timothy Noël Arnab Chaudhuri Robin P. L. Visser John van der Schaaf Cíntia Soares Natan Padoin Koen P. L. Kuijpers Matthieu Dorbec Flow Chemistry Group Van ’t Hoff Institute for Molecular Sciences Universiteit van Amsterdam Amsterdam The Netherlands Department of Chemical Engineering and Chemistry Sustainable Process Engineering Eindhoven University of Technology Eindhoven The Netherlands Department of Chemical and Food Engineering Federal University of Santa Catarina Florianópolis Brazil Technology and Engineering Group Janssen Research and Development Beerse Belgium

Photocatalysis for small-molecule activation has advanced considerably over the past decade, yet its scale-up remains challenging in part due to photon attenuation effects. One promising solution lies in combining high photonic intensities with continuous-flow reactor technology, requiring careful understanding of photon transport for successful implementation. Here, to address this, we introduce a characterization approach, starting with radiometric light source analysis, followed by three-dimensional reactor and light source simulation. This strategy, when followed up with chemical actinometry experiments, decouples photon flux quantification and path length determination, substantially curtailing the experimental process. The workflow proves versatile across various reactor systems, simplifying intricate light interactions into a single one-dimensional parameter—the effective optical path length. This parameter effectively characterizes photoreactor setups, irrespective of scale, geometry, light intensity or concentration. Additionally, the proposed workflow provides insight into light source positioning and reactor design, and facilitates experiments at lower concentrations, ensuring representative reactor operation. In essence, our approach provides a thorough, efficient and consistent framework for reactor irradiation characterization.

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Front Cover: Electrochemical Hydroxylation of Electron-Rich Arenes in Continuous flow (Eur. J. Org. Chem. 20/2022)

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European Journal of Organic chemistry 2022年第20期2022卷

作者： Anni Kooli Dr. Lars Wesenberg Marko Beslać Anastasiya Krech Prof. Margus Lopp Prof. Timothy Noël Dr. Maksim Ošeka Department of Chemistry and Biotechnology Tallinn University of Technology Akadeemia tee 15 12618 Tallinn Estonia Van't Hoff Institute for Molecular Sciences (HIMS) University of Amsterdam Science Park 904 1098 XH Amsterdam The Netherlands Department of Chemical Engineering and Chemistry Micro Flow Chemistry & Synthetic Methodology Eindhoven University of Technology 5612 AZ Eindhoven The Netherlands

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Life-cycle thinking for the ONE-flow solvent factory and first assessment circumpassing the common lack of solubility data 23

Life-cycle thinking for the ONE-FLOW solvent factory and fir...

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23rd International Congress of Chemical and process Engineering, CHISA 2018 and 21st Conference on process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction, PRES 2018

作者： Morales-Gonzalez, P.M. Zhang, C. Li, S. Hessel, V. Eindhoven University of Technology Dep. Chemical Engineering- Micro Flow Chemistry and Process Technology Groene Loper 5 Eindhoven5612AE Netherlands

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Visible‐Light‐Promoted Iron‐Catalyzed C(sp2)–C(sp3) Kumada Cross‐Coupling in flow

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Angewandte Chemie 2019年第37期131卷

作者： Xiao‐Jing Wei Irini Abdiaj Carlo Sambiagio Chenfei Li Eli Zysman‐Colman Jesús Alcázar Timothy Noël Department of Chemical Engineering and Chemistry Micro Flow Chemistry and Synthetic Methodology Eindhoven University of Technology Den Dolech 2 5612 AZ Eindhoven The Netherlands Discovery Sciences Janssen Research and Development Jannsen-Cilag S.A. Jarama 75A 45007 Toledo Spain Organic Semiconductor Center EaStCHEM School of Chemistry University of St Andrews St Andrews Fife KY16 9ST UK

A continuous‐flow, visible‐light‐promoted method has been developed to overcome the limitations of iron‐catalyzed Kumada–Corriu cross‐coupling reactions. A variety of strongly electron rich aryl chlorides, previously hardly reactive, could be efficiently coupled with aliphatic Grignard reagents at room temperature in high yields and within a few minutes’ residence time, considerably enhancing the applicability of this iron‐catalyzed reaction. The robustness of this protocol was demonstrated on a multigram scale, thus providing the potential for future pharmaceutical application.

关键词： Eisenkatalyse flow-Chemie Keuzkupplungen Kumada-Kupplung Photokatalyse

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Selective C(sp3)−H Aerobic Oxidation Enabled by Decatungstate Photocatalysis in flow

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Angewandte Chemie 2018年第15期130卷

作者： Gabriele Laudadio Sebastian Govaerts Ying Wang Davide Ravelli Hannes F. Koolman Maurizio Fagnoni Stevan W. Djuric Timothy Noël Department of Chemical Engineering and Chemistry Micro Flow Chemistry and Process Technology Eindhoven University of Technology Den Dolech 2 5612 AZ Eindhoven The Netherlands Discovery Chemistry and Technologies AbbVie Inc. 1 North Waukegan Road North Chicago Illinois 60064 USA PhotoGreen Lab Department of Chemistry University of Pavia Viale Taramelli 12 27100 Pavia Italy Current affiliation: Medicinal Chemistry Boehringer Ingelheim Pharma GmbH & Co. KG Birkendorfer Strasse 65 88397 Biberach an der Riss Germany

A mild and selective C(sp 3 )−H aerobic oxidation enabled by decatungstate photocatalysis has been developed. The reaction can be significantly improved in a microflow reactor enabling the safe use of oxygen and enhanced irradiation of the reaction mixture. Our method allows for the oxidation of both activated and unactivated C−H bonds (30 examples). The ability to selectively oxidize natural scaffolds, such as (−)‐ambroxide, pregnenolone acetate, (+)‐sclareolide, and artemisinin, exemplifies the utility of this new method.

关键词： Aerobe Oxidation C(sp3)-H-Funktionalisierung Decawolframat Flusschemie Photokatalyse

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Cover Picture: Nitrogen Fixation by Gliding Arc Plasma: Better Insight by Chemical Kinetics Modelling (ChemSusChem 10/2017)

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ChemSusChem 2017年第10期10卷 2108-2108页

作者： Dr. Weizong Wang Bhaskar Patil Stjin Heijkers Prof. Dr. Volker Hessel Prof. Dr. Annemie Bogaerts Department of Chemistry research group PLASMANT University of Antwerp Universiteitsplein 1 2610 Antwerp Belgium Department of Chemical Engineering and Chemistry Laboratory of Chemical Reactor Engineering/ Micro Flow Chemistry and Process Technology Eindhoven University of Technology P. O. Box 513 5600 MB Eindhoven The Netherlands

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Practical Photocatalytic Trifluoromethylation and Hydrotrifluoromethylation of Styrenes in Batch and flow

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Angewandte Chemie 2016年第50期128卷

作者： Natan J. W. Straathof Sten E. Cramer Volker Hessel Timothy Noël Department of Chemical Engineering and Chemistry Micro Flow Chemistry & Process Technology Eindhoven University of Technology Den Dolech 2 5612 AZ Eindhoven The Netherlands

Styrenes represent a challenging class of substrates for current radical trifluoromethylation and hydrotrifluoromethylation methods due to a myriad of potential side reactions. Herein, we describe the development of mild, selective and broadly applicable photocatalytic trifluoromethylation and hydrotrifluoromethylation protocols for these challenging substrates. The methods use fac‐Ir(ppy) 3 , visible light and inexpensive CF 3 I and can be applied to a diverse set of vinylarene substrates. The use of continuous‐flow photochemical reaction conditions allowed to reduce the reaction time and increase the reaction selectivity.

关键词： Durchflusschemie Hydrotrifluormethylierung Mikroreaktoren Photoredoxkatalyse Trifluormethylierung

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A Leaf‐Inspired Luminescent Solar Concentrator for Energy‐Efficient Continuous‐flow Photochemistry

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Angewandte Chemie 2016年第4期129卷

作者： Dario Cambié Fang Zhao Volker Hessel Michael G. Debije Timothy Noël Department of Chemical Engineering and Chemistry Micro Flow Chemistry & Process Technology Eindhoven University of Technology Den Dolech 2 5612 AZ Eindhoven The Netherlands Department of Chemical Engineering and Chemistry Functional Organic Materials & Devices Eindhoven University of Technology Den Dolech 2 5612 AZ Eindhoven The Netherlands

The use of solar light to promote chemical reactions holds significant potential with regard to sustainable energy solutions. While the number of visible light‐induced transformations has increased significantly, the use of abundant solar light has been extremely limited. We report a leaf‐inspired photomicroreactor that constitutes a merger between luminescent solar concentrators (LSCs) and flow photochemistry to enable green and efficient reactions powered by solar irradiation. This device based on fluorescent dye‐doped polydimethylsiloxane collects sunlight, focuses the energy to a narrow wavelength region, and then transports that energy to embedded microchannels where the flowing reactants are converted.

关键词： Energieumwandlung Lumineszierender Solarkonzentrator Mikroreaktoren Photochemie Sonnenenergie

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