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Polymer hydrogel confined palladium nanoparticles as recyclable catalysts for Suzuki and Heck cross-coupling reactions

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Chinese Chemical Letters 2020年第6期31卷 1630-1634页

作者： kan zhan Ping Lu Jian Dong Xu Hou School of Chemistry and Chemical Engineering Shaoxing UniversityShaoxing 312000China School of Chemistry and Chemical Engineering Xiamen UniversityXiamen 361005China

Reusable palladium nanoparticles highly dispersed in porous and hydrophilic interpenetrating polymer networks(IPN),i.e.,Pd@IPN hybrid gels,are employed for catalysis of Suzuki and Heck coupling *** yields are obtained with high turnover frequencies when the reactions are run with very low *** use of IPN gives better recyclability than that of crosslinked polyvinyl alcohol *** polymer networks allow the reactants to have easy access to the Pd *** catalysts combine high activity with the reusability offered by the heterogeneous system,without the need for strong coordination or chelating ligands.

关键词： Nanoparticle Catalysis Hydrogels Palladium Water

ATRP-Template Dispersion Polymerization of Methacrylic Acid/PVP

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Chinese Journal of Polymer Science 2014年第4期32卷 476-487页

作者： Cheng-cheng Yang Dan Meng kan zhan Yu-lu Chen Hui zhang Min Wu 倪恨美 School of Chemistry and Chemical Engineering Southeast University

ATRP-template dispersion polymerization of methacrylic acid （MAA） on the template of polyvinyl pyrrolidone （PVP K-30） was carried out in the aqueous solution by using methyl 2-bromopropionate （MBP）/CuC1/2,2＇-bipyridine （bpy） as the initiation system. The scanning electron microscopy （SEM）, dynamic light scattering （DLS） and gel permeation chromatography （GPC） were employed for evaluating the results of polymerization. As a result, the minimonomer droplets formed due to the H-bond interaction of PVP-MAA. The stability of droplets was dependent on pH and the concentrations of both PVP and MAA. When pH 〈 2, the coagulum of PVP-MAA formed, whereas when pH 〉 4.5, the droplets were not observable by DLS. In order to prepare the stable latex, the concentration of PVP should be lower than 9 wt%, whilst the concentration of MAA should be lower than 5.5 wt%. The optimum condition was pH 2.4, PVP 4.76 wt% and MAA 5 wt%, by which the stable latex of ca. 50 nm nanoparticles of PMAA/PVP was prepared by ATRP polymerization and simultaneously the molar mass of PVP was duplicated by PMAA according to GPC diagrams. In contrast, by using AIBN, KPS and KPS-Na2SO3 redox initiation system, the coagulum accompanying with the larger molar mass of PMAA was obtained, irrespective of pH and concentrations of PVP and MAA.

关键词： Nanoparticle ATRP Dispersion polymerization Template polymerization Hydrogel.

Partition of Initiators in Quasi-static Precipitation Polymerization of AAm/MAc

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Chinese Journal of Polymer Science 2014年第10期32卷 1400-1412页

作者：倪恨美 Hui zhang Guo-xia Chen Jun-xiu Liu Ya-dong Yang Li-jun zhang Min Wu kan zhan Yu-lu Chen School of Chemistry and Chemical Engineering Southeast University

In order to investigate the partition of initiators for quasi-static precipitation polymerization of acrylamide （AAm） and methacrylic acid （MAc） in ethanol, azo-initiators were employed with various functional groups such as --COOCH3 （V- 601, dimethyl 2,2＇-azobis（isobutyrate））, --CN （V-65, 2,2＇-Azobis（2,4-diemthylvaleronitrile））, --COOH （V-501, 4,4＇-azobis（4-cyanovaleric acid）） and --NH-（VA-061, 2,2＇-azobis[2-（2-imidazolin-2-yl）propane]）, respectively. Particle size, induction time and kinetics of polymerization were investigated by the scanning electron microscopy （SEM） and gravimetry. It was observed that the polymerization parameters, such as the particle size, induction time and polymerization rate, were considerably affected by the functional groups of initiators. Besides, the monomer concentration also played important roles in the particle formation. By using V-601, the polymerization rate was strongly correlated with the total surface area of particles and the concentration of initiators. However, by using V-50 l, the polymerization rate was strongly related to WoQo, where W0 is the initial concentration of monomers and Ci,0, the initial concentration of initiators. The results indicated that the different functional groups determined the different partition types of initiators between the minimonomer droplets and the continuous phase due to the molecular interactions of initiator and monomers. V-601 was all partitioned in the continuous phase, but a part of V-65 was partitioned in the minimonomer droplets. Besides the V-501 dissolved in the continuous phase, a part of V-501 was adsorbed on the surface of minimonomer droplets. VA-061 destroyed the stability of minimonomer droplets by the formation of zwitterions with MAA.

关键词： Partition of initiator Precipitation of polymerization Quasi-static state Methacrylic acid and acrylamide

Nanopore-based surface-enhanced Raman scattering technologies

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Science Bulletin 2022年第15期67卷 1539-1541页

作者： Hai-Ling Liu kan zhan kang Wang Xing-Hua Xia School of Chemistry and Chemical Engineering Shaoxing UniversityShaoxing 312000China State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China College of Biotechnology and Bioengineering Zhejiang University of TechnologyHangzhou 310014China

Nanopore-based technologies for the detection of single molecules have shown great promise in many applications,such as DNA sequencing,ion recognition and detection,nucleic acids and proteins detections,and mimicing ions transportation across biological membranes[1,2].The advantages of nanopore-based technologies mainly include high efficiency,versatility,and simple *** passage of analytes through a nanopore induces the change of ionic current,which is used for the detection and study of the ions,biomolecules and polymers,etc.[3].

关键词：表面增强拉曼散射技术 passage transportation

Discontinuous streaming potential via liquid gate

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eScience 2022年第6期2卷 615-622页

作者： Jian zhang kan zhan Shusong zhang Yigang Shen Yaqi Hou Jing Liu Yi Fan Yunmao zhang Shuli Wang Yanbo Xie Xinyu Chen Xu Hou State Key Laboratory of Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen361005China Institute of Artificial Intelligence Xiamen UniversityXiamen361005China School of Physical Science and Technology Northwestern Polytechnical UniversityXi'an710072China School of Aeronautics and Institute of Extreme Mechanics Northwestern Polytechnical UniversityXi'an710072China Fujian Engineering Research Center for Solid-State Lighting Department of Electronic ScienceSchool of Electronic Science and EngineeringXiamen UniversityXiamen361005China College of Physical Science and Technology Xiamen UniversityXiamen361005China Office of International Cooperation and Exchange Xiamen UniversityXiamen361005China Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province(IKKEM) Xiamen361005China

Streaming potential is mainly related to electrokinetic energy conversion,which has been considered to show promising potential for advanced technologies,especially *** inherent property of streaming potential is that the energy conversion process is always a continuous ***,practical applications include many cases of discontinuous states,such as nonlinear ***,we report a discontinuous streaming potential electrokinetic energy conversion fluid *** and theoretical calculations reveal that this system exhibits a discontinuous electrokinetic effect and provides a gating liquid slip in micropores,offering the advantages of gating liquid charge coupling and interfacial drag ***,the system is demonstrated in a wearable fall-down alert *** expect this liquid gating energy conversion system to open up a platform for the design and application of autonomous health monitoring devices,seismic sea wave warning systems,and beyond.

关键词： Liquid gating technology Electrokinetic effect Membrane science Discontinuous behavior Streaming potential

学习型社会视角下地方高校继续教育学校定位的应然与实然探析

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成人教育 2015年第3期35卷 20-23页

作者：陈娟占侃淮阴师范学院继续教育学院江苏淮阴223001

我国以地方高校为依托的继续教育在激烈的竞争中占据主体地位,它们与普通高校资源共享,合作共生,在培养地方应用型人才、指导地方科技创新和服务社会大众方面有着独特的优势条件,但置身于以传统的普通高等教育为重心的地方高校实然环境... 详细信息

我国以地方高校为依托的继续教育在激烈的竞争中占据主体地位,它们与普通高校资源共享,合作共生,在培养地方应用型人才、指导地方科技创新和服务社会大众方面有着独特的优势条件,但置身于以传统的普通高等教育为重心的地方高校实然环境中,继续教育则暴露出了明显的定位偏差。从学习型社会视角重新审视继续教育的目标定位和学校行为,矫正对继续教育认识上的偏差,使其获得应有的重视,发挥应有的"全民教育""终身教育"功能。

关键词：学习型社会地方高校继续教育定位

江苏高校校企合作研究:基于社会网络分析的视角

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科研管理 2016年第10期37卷 146-152页

作者：占侃孙俊华淮阴师范学院继续教育学院江苏淮安223001 南京大学教育研究院江苏南京210093 厦门大学教育研究院福建厦门361005

本文通过统计江苏省内56所高校2007-2012年间的校企合作关系数量,利用社会网络分析方法,对高校参与校企合作的情况进行了分析。研究发现,校企合作整体上存在较大提升空间;对于大部分高校而言,积极参与校企合作有助于获取更多科研经费,... 详细信息

本文通过统计江苏省内56所高校2007-2012年间的校企合作关系数量,利用社会网络分析方法,对高校参与校企合作的情况进行了分析。研究发现,校企合作整体上存在较大提升空间;对于大部分高校而言,积极参与校企合作有助于获取更多科研经费,有助于提高科研产出;但过多参与则可能对高校的人才培养质量、科研人员自主性、高校发展方向等方面产生一定影响。

关键词：江苏校企合作社会网络分析实证研究

Industrial applications of biomanufacturing technology in high-value chemicals based on single-carbon(C1)feedstocks and olefins

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Science Bulletin 2024年第22期69卷 3483-3486页

作者： kan zhan Yongnan Shi Junping Zhou Lianggang Huang Heng Tang Liqun Jin Renchao Zheng Yuguo Zheng College of Biotechnology and Bioengineering Zhejiang University of TechnologyHangzhou 310014China

The global chemical industry market is steadily improving after the *** to statistics from the European Chemical Industry Council(CEFIC),the industry's market value was 4.4 trillion dollars in 2022 and is projected to rise to 9.0 trillion dollars by 2030[1,2].Chemical manufacturing produces more than70,000 diverse products each year,ranging from agricultural chemicals,basic chemicals,specialty chemicals,and consumer products to pharmaceuticals.

关键词： dollar value chemicals

Cooperative maximum adhesion tracking control for multi-motor electric locomotives

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Railway Sciences 2025年第1期4卷 22-36页

作者： Leiting Zhao Yongxiang Wang kan Liu Liran Li Jingyuan zhan Qingliang Liu AC Transmission Department China Academy of Railway Sciences Corporation LimitedBeijingChina School of Information Science and Technology Beijing University of TechnologyBeijingChina

Purpose–This study aims to propose a cooperative adhesion control method for trains with multiple motors electric *** method is intended to optimize the output torque of each motor,maximize the utilization of train adhesion within the total torque command,reduce the train skidding/sliding phenomenon and achieve optimal adhesion utilization for each axle,thus realizing the optimal allocation of the multi-motor electric ***/methodology/approach–In this study,a model predictive control(MPC)-based cooperative maximum adhesion tracking control method for multi-motor electric locomotives is ***,train traction system with multiple motors is constructed in accordance with Newton’s second *** equations include the train dynamics equations,the axle dynamics equations,and the wheel-rail adhesion coefficient ***,a new MPC-based multi-axle adhesion co-optimization method is put *** method calculates the optimal output torque through real-time iteration based on the known reference slip speed to achieve multi-axle co-optimization under different ***–This paper presents a MPC system designed for the cooperative control of multi-axle *** results indicate that the proposed control system is able to optimize the adhesion of multiple axles under numerous different conditions and achieve the optimal power distribution based on the reduction of train skidding/***/value–This study presents a novel cooperative adhesion tracking control *** is designed for multi-motor electric locomotives,which has rarely been studied *** simulations are carried out in different conditions,including variable surfaces and motor failing.

关键词： Cooperative control Adhesion control Model predictive control Slip prevent Paper type Research paper