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Preparation and electrochemical performance of spherical Fe_3O_4 as anode materials for Li-ion batteries

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Science China(Technological Sciences) 2009年第11期52卷 3219-3223页

作者： WANG FangBin, CHEN Jie, HUANG KeLong & LIU SuQin college of chemistry & Chemical engineering, Central South University, Changsha 410083, China 1. college of chemistry & Chemical engineering Central South University Changsha 410083 China

Fe3O4 nano-powder was prepared by the hydrothermal method. The structure and morphology of the product were characterized by X-ray diffraction (XRD) and scanning electronic microscopy (SEM). The as-prepared powder has regularly spherical morphology, and the average size of product is about 25 nm. The possible application use of this material as the active mass of anode for rechargeable Li batteries was examined by cyclic voltammeter (CV), galvanostatic charge/*** experimental results showed that this material exhibited large specific capacity at the first cycle, and the discharge and charge capacity retention of this electrode are 37.04% and 48.76%, respectively. Furthermore, the impedance change of Fe3O4 electrode under different cycle number and potential was examined.

关键词： Fe3O4 lithium battery anode electrochemical performance

Fabrication of the DNA/poly(3-methylthiophene) composite film modified electrode and its application for the study on the voltammetric behavior and determination of 8-hydroxy-2'-deoxyguanosine

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Science China chemistry 2009年第11期52卷 2006-2012页

作者： WANG YanHuai,LI Jing,LIU Yan,MA RongNa,JIA WenLi,CUI Hui & WANG HuaiSheng college of chemistry and Chemical engineering,Institute of Analytical chemistry,Liaocheng University,Liaocheng 252059,China 1. college of chemistry and Chemical engineering Institute of Analytical Chemistry Liaocheng University Liaocheng 252059 China

A composite film of DNA/poly(3-methylthiophene)(P3MT) modified glassy carbon electrode(GCE) has been fabricated by electro-deposition method.P3MT film was first electropolymerized at the GCE and the DNA layer was then immobilized on the P3MT layer by electrochemical *** voltammetric behavior of 8-hydroxy-2'-deoxyguanosine(8-OH-dG) at the composite film modified electrode was *** effects of scan rates,pH and the interference of uric acid(UA) on the voltammetric behavior and detection of 8-OH-dG were also *** experimental results suggest that the electrochemical behavior of 8-OH-dG at the composite film modified electrode was greatly improved due to the combination of the advantages of P3MT and *** 0.1 M pH 7.0 phosphate buffer solution(PBS),the anodic peak currents of 8-OH-dG were linear with the 8-OH-dG concentration in two intervals,viz.0.28―4.2 μM and 4.2―19.6 μ*** detection limit of 56 nM 8-OH-dG could be estimated(S/N=3).This proposed composite film modified electrode shows excellent reproducibility and *** may have the potential application for the detection of 8-OH-dG in human urine.

关键词： poly(3-methylthiophene) DNA 8-hydroxy-2’-deoxyguanosine composite film modified electrode

Fluorescence Enhancing Effect of OP on Ga(Ⅲ)-ECBBR system and its Analytical Application

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Rare Metals 2001年第2期20卷 130-132页

作者： Jinzhang Gao, Jianniao Tian, Yanchun Zhao, the Yang, Jingguo Hou, Jingwan Kang (chemistry and Chemical engineering college, Northwest Normal University, Lanzhou 730070, China) 西北师范大学甘肃兰州 730070

The fluorophotometric determination of gallium(Ⅲ) With eriochrome blue black R (ECBBR) was investigated in the presence of OP at pH 2.0n.5. The calibration graph has a good linear relationship in the rabid of 1.6×10-7-1.2× 10-5 mol/L Ga(Ⅲ). The effect of foreign ions was studied and the proposed method was applied to the determination of gallium in aluminum alloy.

关键词： gallium, eriochrome blue black R OP aluminum alloy

A thin-layer spectroelectrochemical study of 3,3',5,5'-tetramethylbenzidine at SnO_2:F film optically transparent electrode

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Science China chemistry 2004年第4期47卷 267-275页

作者： JIAO Kui1, YANG Tao2 & NIU Shuyan1,2 1. college of chemistry and Molecular engineering, Qingdao University of Science and Technology, Qingdao 266042, China 2. college of chemistry and Chemical engineering, Ocean University of China, Qingdao 266003, China Correspondence should be addressed to Jiao Kui 1. college of chemistry and Molecular engineering Qingdao University of Science and Technology 266042 Qingdao China 2. college of chemistry and Chemical engineering Ocean University of China 266003 Qingdao China

The electrooxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) is dependent on the pH value of Britton-Robinson (B-R) buffer solution. In this work, the electrooxidation behavior of TMB was investigated with a SnO2:F film optically transparent thin-layer spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process in the pH range from 2.0 to < 4.0, and two successive one-electron electrooxidation processes in the pH range from 4.0 to < 7.0 in the B-R buffer solution. At pH 6.5, the electrooxidative product of TMB generated a subsequent chemical reaction to yield an azo compound. Several spectroelectrochemical techniques, such as thin-layer cyclic voltammetry, thin-layer cyclic voltabsorptometry, thin-layer potential-controlled electrolysis absorptometry, thin-layer single-potential-step chronoabsorptometry, thin-layer dou-ble-potential-step chronoabsorptometry, thin-layer single-potential-step open-circuit relaxation chronoabsorptometry, were applied to this investigation. The formal potential E0’ and the electron transfer number corresponding to the electrooxidation of TMB in B-R buffer solution, and the reaction rate constant of the subsequent chemical reaction were determined.

关键词： 3,3′,5,5′-tetramethylbenzidine tin oxide film optically transparent electrode thin-layer spectroelectro-chemistry electrooxidation

Effects of Nutrients on Biofouling Formation and Preponderant Bacteria Diversity in Recirculating Cooling Water System

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China Petroleum Processing & Petrochemical Technology 2010年第4期12卷 57-62页

作者： Ma Tao Liu Fang Zhang Guizhi Zhao Chaocheng (college of chemistry and Chemical engineering,China University of Petroleum,Qingdao 266555) China Univ Petr Coll Chem & Chem Engn Qingdao 266555 Peoples R China

A series of orthogonal array experiments were conducted using carbon source, ammonia nitrogen and total phosphorus （TP） as major influencing factors to investigate the effects of nutrients on biofouling formation and preponderant bacteria diversity in the recirculatiug cooling water system. Carbon source was demonstrated to be the most significant determinant affecting the biofouling formation. A minimum biofouling outcome was obtained when BOD2, NHa＋-N and TP were 25, 10, and 1 mg/L, respectively. Then the preponderant bacteria strains in biofouling mass under two typical culture conditions （negative and favorable） were identified applying both traditional biochemical methods and further molecular biology technology with phylogenetic affiliation analysis, which indicated that Enterobacteriaceae Enterobacter, Micrococcaceae Staphylococcus, Bacillaceae Bacillus, Enterobacteriaceae Proteus, Neisseriaceae Neisseria and Pseudomonadaceae Pseudomonas were dominant under negative condition, while Enterobacteriaceae Klebsiella, Enterobacteriaceae Enterobacter and Microbacterium - under favorable one.

关键词： recirculating cooling water biofouling numerical analysis polymerase chain reaction

Effects of combined substitution of Dy and Mo or Si on the crystal structures and magnetic properties of Nd_(1-y)Dy_yFe_(11-x)TiM_x(M=Mo,Si) compounds

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Science China chemistry 2009年第8期52卷 1097-1103页

作者： LI XiangJun,ZHENG Na,HU ZhongBo & YUAN ZhuoBin college of chemistry and Chemical engineering,Graduate University of Chinese Academy of Sciences,Beijing 100049,China 1. college of chemistry and Chemical engineering Graduate University of Chinese Academy of Sciences Beijing 100049 China

A series of Nd1-yDyyFe11-xTiMx(M=Mo,Si) alloys have been prepared by arc melting and studied by X-ray diffraction and neutron *** samples are found to crystallize in the ThMn12-type *** lattice parameters a and c and unit cell volume V of Nd0.5Dy0.5Fe11-xTiMox alloys increase linearly with increasing content of Mo(x),while the lattice parameters a and c and unit cell volume V of Nd0.5Dy0.5Fe11-xTiSix alloys decrease linearly with increasing content of Si(x).In NdyDy1-yFe11-xTiMx(M=Mo,Si) compounds,Ti and Mo atoms preferentially occupy the 8i sites and Si atoms preferentially occupy the 8j and 8f *** measurements show that the substitution of Fe by either Mo or Si leads to a decrease in the Curie temperature.

关键词： rare earth-transition metal compounds crystal structure X-ray diffraction neutron diffraction

Study on Bicoordination Chiral Inducement Catalysis of (R)-4-Thiazolidinecarboxylic Acid

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Chinese Chemical Letters 2004年第12期15卷 1419-1422页

作者： Hui WANG Wei Wei PEI Guo Bin SUN Wei Ping YE college of chemistry and Molecular engineering, Peking University, Beijing 100871 chemistry and Molecular engineering Peking UniversityBeijing 100871

The bicoordination chiral inducement catalysis of (R)-4-thiazolidinecarboxylic acid inthe enantioselective borane reduction of prochiral ketones has been studied. The fact that theabsolute configuration of the main product can be changed by simply using different operationmethods was firstly verified. And the reason of bicoordination chiral inducement was discussed.

关键词： Bicoordination chiral inducement (R)-4-thiazolidinecarboxylic acid.

Study on the Separation of Co^(2+) from Zn^(2+) , Cd^(2+) by Anion-exchange Chromatography

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Journal of Central South University 2000年第2期12卷 88-91页

作者： WANG Xin yan,ZHOU Chun shan,WANG Yan (college of chemistry and Chemical engineering, Central South University of Technology, Changsha 410083, China) 1. college of chemistry and Chemical engineering Central South University of Technology 410083 Changsha China

The separation of Co 2+ from Zn 2+ , Cd 2+ by anion exchange chromatography was discussed. The chromatographic column containing anion resin 201×7 which was saturated with a solution of ammonium chloride. The effects of the eluant acidity and eluant composition on the separation were investigated. The results indicate that this anion exchange chromatography is suitable to the separation of Co 2+ from Zn 2+ , Cd 2+ , and the condition of separation is simple and convenient. When the column is saturated with NH 4Cl solution (2.0 mol/L, pH=4.0), the separation can be completed effectively. Zn 2+ and Cd 2+ can also be separa ted when different eluants are used and the pure solution with high concentration of Zn 2+ , Cd 2+ respectively can be obtained ea sily.

关键词： anion exchange chromatography Zn 2+ Cd 2+ Co 2+ separation

Facile Synthesis of Isoamericanol and Isoamericanin A

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Chinese Chemical Letters 2004年第12期15卷 1392-1394页

作者： Xiao Bi JING Chao Guo YAN Jing SUN Li WANG Lin AN college of chemistry and Chemical engineering, Yangzhou University, Yangzhou 225002 college of chemistry and Chemical engineering Yangzhou UniversityYangzhou 225002

A number of benzodioxane compounds were synthesized using the pal1adium-catalyzedetherification of aryl halides by employing triphenylphosphan ligand. This method was used askey step in the synthesis of isoamericanol ... 详细信息

关键词： Synthesis isoamericanol A isoamericanin A benzodioxane.