检索结果-南通市图书馆

Electrochemical Dearomative Halocyclization of Tryptamine and Tryptophol Derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2020年第10期38卷 1070-1074页

作者： Kun Liu Yuqi Deng Wenxu Song Chunlan Song Aiwen Lei College of Chemistry ond molecular Sciences Institute for Advanced Studies(IAS)Wuhan UnivrsityWuhonHpbei 430072China

Summary of main observation and conclusion Owing to the easy functionalization of 3-haloindolines to many biologically active compounds,extensive efforts have been made for their efficient ***,an electrochemical dearomative bromo-and chloro-cyclization of tryptamine and tryp-tophol derivatives has been developed under undivided electrolytic *** this protocol,neither external chemical oxidants nor harsh conditions are needed,and a wide range of substituted hexahydropyrroloindolines/tetrahydrofuroindolines are obtained with halide ion in high ***-ver,this electrolysis could also be scaled up to gram synthesis with good yields.

关键词： conditions. cyclization substituted

Realizing optimized interfacial polarization and impedance matching with CNT-confined Co nanoparticles in hollow carbon microspheres for enhanced microwave absorption

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2024年第8期175卷 1-9页

作者： Chang Zhang Kaicheng Luo Jiwei Liu Huibin Zhang Chunyang Xu Ruixuan Zhang Yifeng Cheng Jincang Zhang Limin Wu Renchao Che Zhejiang laboratory Hangzhou 311100China laboratory of advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsAcademy for Engineering&TechnologyFudan UniversityShanghai 200438China Inner Mongolia University Hohhot 010021China

The hollow porous structure with exceptional interfacial effect and customizable internal environment shows significant potential for application as electromagnetic shielding and absorption ***,designing hollow porous electromagnetic absorbers with both desirable impedance matching and high loss capability remains a ***,3D hollow porous electromagnetic microspheres were constructed by assembling 0D Co magnetic nanoparticles,1D carbon nanotubes,and 2D carbon *** to the sufficient sites for Co^(2+)riveting,the high loading of magnetic carbon nanotubes(CoNC)and porous carbon spheres formed high-density interfaces,enhancing the interfacial ***,high-density CoNC were grown in situ on the hollow porous carbon(HPC)microsphere,forming a highly dispersed 3D magnetic network that inhibited the aggregation of magnetic nanoparticles and enhanced magnetic ***,the asprepared CoNC/HPC microspheres exhibited excellent microwave absorption(MA)performance,with a minimum reflection loss of-33.2 dB and an effective bandwidth of 5.5 GHz at a thickness of only 1.8 *** interfacial polarization mechanism for enhanced MA performance was demonstrated by electron holography and density functional theory *** holography and micromagnetic simulations also revealed magnetic confinement and coupling *** work provides a new approach for designing electromagnetic absorbers with optimized impedance matching and loss capability.

关键词： Microwave absorption Hollow porous structure Multidimensional assembly Interfacial polarization Magnetic coupling

Mainchain conformation ordering self-assembly tailored room temperature phosphorescence emission

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Chemistry 2025年第1期 329-336页

作者： Yuzhu Li Yumeng Gao Feng Tian Yu Wang Yuan Yao Shaoliang Lin Xiang Ma Binbin Xu Shanghai Key laboratory of advanced Polymeric Materials Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute Chinese Academy of Sciences Key laboratory for Advance Materials and Feringa Noble Prize Scientist Joint Research Centre Frontiers Science for Materiobiology and Dynamic Chemistry School of Chemistry and Molecular Engineering East China University of Science & Technology

Developing organic room-temperature phosphorescence （RTP） materials with a wide range of tunable-emission is significant in expanding the applications of RTP ***,we rationally designed amphiphilic alternating copolymers poly(1,2-bis（4-alkoxyphenyl）ethane-1,2-dione-alt-（ethylene glycol）x)(P（Bz-alt-EGx）) that combined the advantage of alternating benzil and EGxskeleton,and tunable mainchain *** a mainchain conformation ordering assembly （COA） process,P（Bz-alt-EGx） self-assembled into well-defined platelets,and such assemblies emitted blue RTP at ca.425 nm due to the ordered folded-chain conformation and confined *** contrast,traditional self-assembly （TA） of P（Bz-alt-EGx） obtained less ordered aggregates,such as asymmetric worms,vesicles,and rod-like *** resultant less ordered aggregates exhibited yellow-green RTP at ca.550 *** wide-tuning RTP emission in solution （between blue and yellow-green,over125 nm） is realized using the P（Bz-alt-EGx） alternating copolymers under the treatment of different self-assembly *** study uncovers a new strategy to tailor the RTP emission through different self-assembly pathways and holds great promise for the fabrication of advanced optical materials.

关键词：

同方期刊数据库

Modulating the alloying mode in the doping-induced synthesis of Au-Pd nanowires

在线全文

学校读者我要写书评

暂无评论

Nano Research 2024年第4期17卷 3334-3343页

作者： Hui Jin Xiaoliang Wei Lecheng Zhao Jialong Yu Qiao Pan Shumin Li Qian Wang Zhaotong Yuan Dan Yang Donghui Zhao Hongyu Chen Yawen Wang Institute of advanced Synthesis School of Chemistry and Molecular EngineeringJiangsu National Synergistic Innovation Center for Advanced MaterialsNanjing Tech UniversityNanjing 211816China School of Science Westlake UniversityHangzhou 310064China Institute of Natural Sciences Westlake Institute for Advanced StudyHangzhou 310064China

Heterogeneous doping is one effective strategy for synthesizing metal alloy ***,the heterogeneous doping processes of Pd on the ultrathin Au nanowires were systematically modulated and ***-Pd alloy nanowires with various morphologies and lattice structures can be obtained by adjusting the morphology of the precursor Au nanowires and the kinetics of the heterogeneous doping *** effects of the rate of Pd reduction and the concentration of the ligand oleylamine(OAm)on the Pd deposition and alloying mode were ***,as the Pd deposition rate decreases,the Pd deposition and alloying mode switches from the island-forming Stransky–Krastanov(SK)mode to the epitaxial Frank-van der Merwe(FM)mode,and eventually to an unconventional twisting alloying mode,where the interdiffusion of Pd and Au causes drastic rearrangement of the lattice structure and formation of helical *** kinetics-related variation of alloying mode could also be observed in the Au-Ag nanowires,demonstrating a general design principle for the synthesis of alloy *** addition,the electrocatalytic performance of various Au-Pd nanowires was evaluated,and the alloy nanowire formed via the SK mode was found to be an excellent electrocatalyst for oxygen reduction and ethanol oxidation.

关键词： gold nanowires Au-Pd alloy oleylamine post-synthetic modification

Overcoming antibiotic resistance through efficient and scalable total synthesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2022年第11期9卷 7-8页

作者： Yang Jiao Tuoping Luo Key laboratory of Bioorganic Chemistry and molecular Engineering Ministry of Education and Beijing National Laboratory for Molecular ScienceCollege of Chemistry and Molecular EngineeringPeking University Peking-Tsinghua Center for Life Sciences Academy for Advanced Interdisciplinary Studies Peking University Institute of molecular Physiology Shenzhen Bay Laboratory

Bacterial ribosome has served as an important target for antibiotics that are essential to public health, such as erythromycins, tetracyclines, aminoglycosides, pleuromutilin and fusidic acid, all with natural origin [1].The structural complexity of these natural products has posed significant challenges to total synthesis, especially in an efficient and scalable manner,

关键词：

Role of pleiotrophin-protein tyrosine phosphatase receptor type Z signaling in myelination

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2016年第4期11卷 549-551页

作者： Akihiro Fujikawa Masaharu Noda Division of molecular Neurobiology National Institute for Basic BiologyThe Graduate University for Advanced Studies (SOKENDAI) School of Life Science The Graduate University for Advanced Studies (SOKENDAI)

Myelination is an essential feature of the vertebrate nervous system that provides electrical insulation to axons,thereby facilitating the transmission of nerve *** in myelination in diseases such as multiple sclerosi... 详细信息

关键词： Role of pleiotrophin-protein tyrosine phosphatase receptor type Z signaling in myelination type PTP Figure

High loading FeS2 nanoparticles anchored on biomass-derived carbon tube as low cost and long cycle anode for sodium-ion batteries

在线全文

学校读者我要写书评

暂无评论

Green Energy & Environment 2020年第1期5卷 50-58页

作者： Kongyao Chen Gaojie Li Yanjie Wang Weihua Chen Liwei Mi Center for advanced Materials Research Zhongyuan University of TechnologyHenan450007China College of Chemistry and molecular Engineering Zhengzhou UniversityHenan450001China

In recent years, the sodium storage mechanism and performance optimization of FeS2 have been studied intensively. However, before the commercial application of FeS2, preconditions of low-cost, simple craft and scale production of nanoscale FeS2 are also essential. Based on above challenges, mesh-like FeS2/carbon tube/FeS2 composites are prepared simply from green, low-cost and renewable natural herb in this work. With the assistance of protogenetic interconnected carbon tube network(only 5.3 wt%), FeS2/carbon tube/FeS2 composites show high capacity(542.2 mA h g^-1), good stability(< 0.005% per cycle over 1000 cycles), and excellent rate performance(426.2 mA h g^-1 at 2 A g^-1).The outstanding electrochemical performance of FeS2/carbon tube/FeS2 composites may be attributed to the unique interconnected reticular structure, meaning that FeS2 nanoparticles are effectively immobilized by carbon tube network via physical encapsulation and chemical *** importantly, this work may provide green and low cost preparation method for specially structured metal sulfides/carbon composites,which promotes their commercial utilization in environmentally friendly energy storage system.

关键词： FeS2 Biomass-drived carbon Mesh-like structure Low cost Sodium-ion batteries

Effects of L-lactic acid and D,L-lactic acid on viability and osteogenic differentiation of mesenchymal stem cells

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2013年第20期58卷 2404-2412,1-3页

作者： HE Yao WANG WeiRan DING JianDong State Key laboratory of molecular Engineering of Polymers Department of Macromolecular Science Advanced Materials Laboratory Fudan University

Poly(lactic acid) (PLA) and other aliphatic polyesters containing the unit of lactic acid are very popular biodegradable materials. While the degradation products, lactic acids, have been worried to bring with negative influence on biocompatibility, the focused experimental studies are less reported. This study is aimed at an in vitro examination of cytotoxicity of both L-lactic acid and D,L-lactic acid. Mesenchymal stem cells (MSCs) derived from rat bone marrow are employed to test the cytotoxicity of the lactic acids. Considering that the addition of lactic acids not only introduces lactate groups but also alters medium pH and ion strength, these three candidate effects are examined in a decoupled way by setting different comparison groups. The results confirm that the change of medium pH is the predominant factor. It has also been found that D-lactate is more cytotoxic than L-lactate at high concentrations. Yet, either L-or D,L-lactic acids seem acceptable in most of medical applications, because the cytotoxicity is significant only when the concentrations are as high as 20 mmol/L for both of them.

关键词：骨髓间充质干细胞 L-乳酸成骨分化细胞毒作用能力细胞毒性可生物降解生物相容性

Construction of hierarchical three-dimensional interspersed flower-like nickel hydroxide for asymmetric supercapacitors

在线全文

学校读者我要写书评

暂无评论

Nano Research 2017年第11期10卷 3726-3742页

作者： Wutao Wei Weihua Chen Luoyi Ding Shizhong Cui Liwei Mi Center for advanced Materials Research Zhongyuan University of Technology Zhengzhou 450007 China College of Chemistry and molecular Engineering Zhengzhou University Zhengzhou 450001 China

Low-cost and easily obtainable electrode materials are crucial for the application of *** hydroxides have recently attracted intensive attention owning to their high theoretical specific capacitance,high redox activity,low cost,and *** this study,novel three-dimensional （3D） interspersed flower-like nickel hydroxide was assembled under mild *** ammonia was used as the precipitant and inhibitor and CTAB was used as an exfoliation agent,the obtained exfoliated ultrathin Ni（OH）2 nanosheets were assembled into 3D interspersed flower-like nickel *** this novel 3D structure,the ultrathin Ni（OH）2 nanosheets not only provided a large contact area with the electrolyte,reducing the polarization of the electrochemical reaction and providing more active sites,but also reduced the concentration polarization in the electrode solution ***,the utilization efficiency of the active material was improved,yielding a high *** electrochemical performance was improved via promoting the electrical conductivity by mixing the as-synthesized Ni（OH）2 with carbon tubes （N-4-CNT electrode）,yielding excellent specific capacitances of 2,225.1 F＆#183;g-1 at 0.5 A＆#183;g-1 in a three-electrode system and 722.0 F＆#183;g-1 at 0.2 A＆#183;g-1 in a two-electrode *** N-4-CNT//active carbon （AC） device exhibited long-term cycling performance （capacitance-retention ratio of 111.4% after 10,000 cycles at 5 A＆#183;g-1） and a high specific capacitance of 180.5 F＆#183;g-1 with a high energy density of 33.5 W＆#183;h＆#183;kg-1 and a power density of 2,251.6 W＆#183;kg-1.

关键词： energy storage hierarchical nanostructures nickel ultrathin nanosheets supercapacitors