检索结果-南通市图书馆

Nano Research 2023年第3期16卷 4085-4092页

作者： Yunong Zhao Jing Huang Qing Huang Yanbing Tao Ruiqin Gu Hua-Yao Li Huan Liu School of Optical and Electronic Information Wuhan National Laboratory for OptoelectronicsOptics Valley LaboratoryHuazhong University of Science and TechnologyWuhan 430074China

Rapid and accurate detection of glucose is of great significance for diabetic management.Highly sensitive glucose sensors promise to achieve noninvasive detection technology,enabling more convenient and efficient means for large-scale screening and long-term dynamic monitoring of diabetes patients.In this work,we demonstrate a sensitive glucose electrochemical biosensor through the synergetic labelling strategy utilizing PbS colloidal quantum dots(CQDs)and Au nanospheres(AuNSs).The PbS CQDs/AuNSs/glucose oxidase(GOx)mixture could be stably immobilized on the carbon electrode surface via the onestep dip-coating method.The electrochemical biosensor employing PbS CQDs/AuNSs/GOx-modified electrode integrates the functions of specific molecule recognition,signal transduction as well as signal amplification.The sensor is capable of transducing the glucose enzyme-catalyzed reaction into significant current signals,exhibiting a good linear response in the glucose concentration range of 0.1μM-10 mM with the limit of detection being 1.432 nM.

关键词： colloidal quantum dot gold nanosphere ligand exchange electrochemical glucose biosensor electronic labelling

electrochemical construction of 2,5-diaryloxazoles via N–H and C(sp_(3))-H functionalization

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 340-345页

作者： Tong Li Leping Pan Yan Zhang Jihu Su Kai Li Kuiliang Li Hu Chen Qi Sun Zhiyong Wang Hefei National Center for Physical Sciences at Microscale Key Laboratory of Precision and Intelligent ChemistrySchool of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China Anhui University of Science and Technology Huainan 232001China CAS Key Laboratory of Microscale Magnetic Resonance Department of Modern PhysicsUniversity of Science and Technology of ChinaHefei 230026China

An efficient N–H and C(sp~3)-H functionalization of aryl ketones with benzylamines/amino acids was developed under mild conditions by virtue of anodic oxidation. A variety of functionalized 2,5-diaryloxazoles were obtained with good to excellent yields. Moreover, some important natural products can be prepared by this method. The reaction features a broad substrate scope, scalability, metal-free and chemical oxidant-free.

关键词： electrochemical Metal-free Oxazole Oxidant-free

electrochemical analysis of microRNAs with hybridization chain reaction-based triple signal amplification

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第7期34卷 210-213页

作者： Jianfeng Ma Lingbo Gong Yingying Cen Lin Feng Yan Su Xingfen Liu Jie Chao Ying Wan Shao Su Lianhui Wang State Key Laboratory of Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced Materials(IAM).Nanjing University of Posts and TelecommunicationsNanjing 210023China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China

Selective and sensitive detection of trace microRNA is important for early diagnosis of diseases due to its expression level related to diseases.Herein,a triple signal amplification strategy is developed for trace microRNA-21 (miRNA-21) detection by combining with target-triggered cyclic strand displacement reaction (TCSDR),hybridization chain reaction (HCR) and enzyme catalytic amplification.Four DNA hairpins(H1,H2,H3,H4) are employed to form an ultralong double-strand DNA (dsDNA) structure,which is initiated by target miRNA-21.As H3 and H4 are labeled with horseradish peroxidase (HRP),numerous HRPs are loaded on the long dsDNA,producing significantly enhanced electrocatalytic signals in the hydrogen peroxide (H_(2)O_(2)) and 3,3,5,5-tetramethylbenzidine (TMB) reaction strategy.Compared with single signal amplification,the triple signal amplification strategy shows higher electrochemical response,wider dynamic range and lower detection limit for miRNA-21 detection with excellent selectivity,reproducibility and stability.Taking advantage of the triple signal amplification strategy,the proposed electrochemical biosensor can detect miRNA-21 in 10 He La cell lysates,suggesting that it is a promising method for fruitful assay in clinical diagnosis.

关键词： electrochemical Biosensor microRNAs Hybridization chain reaction Target-triggered cyclic strand displacement reaction Triple signal amplification

electrochemical Oxidation Dearomatization of Anisol Derivatives toward Spiropyrrolidines and Spirolactones

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第4期4卷 1199-1207页

作者： Cui Zhang Faxiang Bu Chulin Zeng Dan Wang Lijun Lu Heng Zhang Aiwen Lei College of Chemistry and Molecular Sciences Institute for Advanced Studies(IAS)Wuhan UniversityWuhanHubei 430072 State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032

Spiro compounds are widely prevalent in biological activities and natural products.However,developing new strategies for their efficient synthesis and derivatization remains a challenge.Outstanding progress has been made in the synthesis of spiro compounds through dearomatization of aromatic compounds,most of them are mediated by the hypervalent iodine reagents.Herein,we report a method of anodic oxidation spiroamination and spirolactonization of anisole derivatives with concomitant cathodic reduction of protons in the absence of hypervalent iodine reagents.A wide variety of spiropyrrolidines and spirolactones with diverse functional groups made useful scaffolds in this transformation,with yields up to 97%.Moreover,hectogram-scale synthesis could supply target product with 83% yield in a flow electrochemical cell using carbon paper as the anode and nickel plate as the cathode,demonstrating the potential application of this method.

关键词： electrochemical spiropyrrolidine spirolactone dearomatization spiro-cycle anisole derivatives hectogram synthesis flow cell

electrochemical determination of an anti-hyperlipidimic drug pitavastatin at electrochemical sensor based on electrochemically pre-treated polymer film modified GCE

维普期刊数据库评论

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 Pharmaceutical Analysis 2017年第4期7卷 258-264页

作者： Umar J.Pandit Gowhar A.Naikoo Mehraj Ud Din Sheikh Gulzar A.Khan K.K.Raj S.N.Limaye Department of Chemistry Dr. Harisingh Gour UniversitySagarM.P.India Department of Mathematics and Sciences College of Arts and Applied SciencesDofar UniversitySalalahOman

An electrochemically pretreated silver macroporous(Ag MP) multiwalled carbon nanotube modified glassy carbon electrode(PAN-Ag MP-MWCNT-GCE) was fabricated for the selective determination of an antihyperlipidimic drug, pitavastatin(PST). The fabricated electrochemical sensor was characterized by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The fabricated electrode was employed in quantifying and determining PST through differential pulse adsorptive stripping voltammetry(DPAdSV) and CV. The electrode fabrication proceeded with remarkable sensitivity to the determination of PST. The effect of various optimized parameters such as pH, scan rate(ν), accumulation time(t_(acc)), accumulation potential(U_(acc))and loading volumes of Ag MP-MWCNT suspension were investigated to evaluate the performance of synthesized electrochemical sensor and to propose a simple, accurate, rapid and economical procedure for the quantification of PST in pharmaceutical formulations and biological fluids. A linear response of PST concentration in the range 2.0×10^(-7)–1.6×10^(-6)M with low detection(LOD) and quantification(LOQ) limits of 9.66 ± 0.04 nM and 32.25 ± 0.07 nM, respectively, were obtained under these optimized conditions.

关键词： Pitavastatin electrochemical sensor Adsorptive stripping voltammetry Biological fluids Pharmaceutical formulations

electrochemical characterization of AlPO_(4) coated LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2) cathode materials for high temperature lithium battery application

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2021年第1期40卷 78-83页

作者： Jian-Hua Wang Yu Wang Yu-Zhong Guo Chang-Wei Liu Lu-Lu Dan Research Center for Analysis and Measure Kunming University of Science and TechnologyKunming 650093China School of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Aluminum phosphate(AlPO_(4))was used to modify the surface of LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(NCM)cathode material.The surface structure and electrochemical properties of the coated materials were investigated by X-ray photoelectron spectroscopy(XPS)and electrochemical impedance spectroscopy(EIS).The results confirm the formation of aluminum-containing solid solution on the surface of NCM particles.An aluminum phosphate coating blocks the Li+insertion-extraction process in cells charged at high rates at room temperature,increasing surface film resistance and decreasing discharge capacity.However,an aluminum phosphate aids the formation of a stable solid electrolyte interface film on NCM surface and stabilizes the Rct of cell as samples electrochemically cycled at 55℃.The electrochemical studies suggest that the initial columbic efficiency is significantly enhanced.An NCM sample coated with 1.0 wt%AlPO_(4) delivers a higher discharge capacity and shows excellent capacity retention ability.

关键词： Surface Lithium battery electrochemical

electrochemical process of sulfur in carbon materials from electrode thickness to interlayer

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2019年第4期28卷 119-124页

作者： Xiaonan Tang Zhenhua Sun Huicong Yang Haitao Fang Fei Wei Hui-Ming Cheng Shuping Zhuo Feng Li School of Chemical Engineering Shandong University of Technology Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China School of Materials Science and Engineering Harbin Institute of Technology Department of Chemical Engineering Tsinghua University Tsinghua-Berkeley Shenzhen Institute Tsinghua University

Lots of efforts have been done on different porous carbon materials as cathode for Lithium–sulfur(Li–S)battery. However, seldom researches have been done on the relationship between cathode thickness and electrochemical performance. Our work investigates the relation between electrochemical performance and cathode thickness with typical porous carbon materials. We explain the phenomenon that only a modest cathode thickness can have the most adequate electrochemical reaction trend through the aspect of thermodynamics(chemical potential) so that the best electrochemical performance can be obtained.Besides, interlayer can remit the shuttle effect but hinder the lithium ion diffusion process simultaneously. And we verify the effect of interlayer thickness on the shuttle effect and lithium ion diffusion process.

关键词： Lithium-sulfur battery electrochemical reaction Cathode thickness Chemical potential Ion diffusion

electrochemical behavior of Mg-Al-Zn-Ga-In alloy as the anode for seawater-activated battery

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第6期41卷 33-42页

作者： Jiarun Li Zhuoyuan Chen Jiangping Jing Jian Hou Key Laboratory of Marine Environmental Corrosion and Bio-fouling Institute of OceanologyChinese Academy of Sciences7 Nanhai RoadQingdao266071China State Key Laboratory for Marine Corrosion and Protection Luoyang Ship Material Research InstituteWenhai RoadQingdao266237China Center for Ocean Mega-Science Chinese Academy of Sciences7 Nanhai RoadQingdao266071China Open Studio for Marine Corrosion and Protection Pilot National Laboratory for Marine Science and Technology(Qingdao)No.1 Wenhai RoadQingdao266237China

The effect of indium alloying on the corrosion and discharge behaviors of Mg-Al-Zn-Ga alloys is investigated via materials characterization,immersion test and electrochemical methods.The results indicate that indium alloying can effectively modify the distribution of intermetallic phases in Mg matrix via promoting the segregation of Al in the form of Mg17Al12 in matrix.The addition of indium can effectively activate Mg-Al-Zn-Ga alloy evidenced by increased hydrogen evolution volume and weight loss,negative shift of corrosion and discharge potentials,increase of corrosion current density,decrease of polarization resistance and promoted Faradic efficiency.Nonetheless,excessive indium alloying(2.0 wt.%)would strikingly deteriorate the electrochemical performance of Mg-Al-Zn-Ga anode due to the exorbitant active effect.The Mg-6 wt.%Al-3 wt.%Zn-1 wt.%Ga-1 wt.%In in as-cast state with acceptable corrosion rate and desirable discharge performance is a low cost,non-toxic and well-performance magnesium alloy,which is a promising anode materials for seawater-activated batteries.

关键词： Magnesium alloy Corrosion electrochemical behavior Anode Seawater-activated battery

electrochemical Aziridination of Tetrasubstituted Alkenes with Ammonia

在线全文

学校读者我要写书评

暂无评论

CCS Chemistry 2022年第2期4卷 693-703页

作者： Shuai Liu Wenxuan Zhao Jin Li Na Wu Chang Liu Xin Wang Shuohao Li Yan Zhu Yong Liang Xu Cheng Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023 Jiangsu Provincial Engineering Laboratory of Advanced Materials for Salt Chemical Industry College of Chemical EngineeringHuaiyin Institute of TechnologyHuaianJiangsu 223003 Henan-Macquarie University Joint Center for Biomedical Innovation School of Life SciencesHenan UniversityKaifengHenan 475004 State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071

Ammonia(NH3)is an ideal nitrogen source in terms of availability,reactivity,safety,atom economy,environmental compatibility,and ease of isolation.However,its utility for amine synthesis is limited by its high bond dissociation energy,its strong coordination ability,and the difference between its reactivity and that of the product amines.Herein,we reported the first electrochemical protocol for direct syntheses of unprotected tetrasubstituted aziridines with NH3 and alkenes in the absence of an oxidant,which are highly challenging to achieve by other methods.The combination of graphite felt as the anode material and MeOH as the solvent was the key to the success of the protocol,and the effects of these factors were investigated by means of cyclic voltammetry and density functional theory calculations.

关键词： ammonia aziridination electrochemical graphite felt amination

electrochemical synthesis of 3-azido-indolines from amino-azidation of alkenes

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2021年第3期32卷 1033-1036页

作者： Shengping Guo Liyan Liu Kangfei Hu Qi Sun Zhenggen Zha Yu Yang Zhiyong Wang Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Soft Matter Chemistry&Center for Excellence in Molecular Synthesis of Chinese Academy of SciencesCollaborative Innovation Center of Suzhou Nano Science and Technology&School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China School of Chemistry and Chemical Engineering Hefei Normol UniversityHefei 230601China

An electrochemical amino-azidation of 2-aminostyre ne with sodium azide(NaN3)was developed,which can be carried out smoothly in water under metal-free condition,affording a series of 3-azido indolines with high yields.

关键词： electrochemical Amino-azidation 2-Amino styrene Metal-free Oxidant-free 3-Azido indolines