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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

Novel nanoporous binary Ag-Ni electrocatalysts for hydrazine oxidation

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Rare Metals 2010年第1期29卷 26-31页

作者： YI Qingfeng, LI Lei, YU Wenqiang, LIU Xiaoping, ZHOU Zhihua, and NIE Huidong School of chemistry and chemical engineering, Hunan university of Science and technology, Xiangtan 411201, china School of chemistry and chemical engineering Hunan University of Science and Technology

From an aqueous mixture of Ag（I）-EDTA complex and Ni（II） nitrate, silver and nickel particles were co-deposited on the surface of titanium substrates by the hydrothermal method using hydrazine hydrate as a reduction agent. The prepared titanium-supported nano-scale Ag and Ag-Ni particles （nano Ag/Ti, nano Ag86Ni14/Ti, nano Ag77Ni23/Ti, and nano Ag74Ni26/Ti） exhibit nanoporous 3D network textures. Their electrocatalytic activity towards hydrazine oxidation in alkaline solutions was evaluated by cyclic voltammetry and chronoamperometry. The results show that the four samples present a low onset potential of ca. -0.60 V vs. SCE and considerably high and stable anodic current densities for hydrazine oxidation. Among them, the nano Ag86Ni14/Ti electrode exhibits the highest anodic current density towards hydrazine oxidation, showing an increment of electro-active sites on the nano Ag86Ni14/Ti due to the addition of Ni to Ag particles.

关键词： electrocatalyst silver hydrazine oxidation fuel cell

异丙烯膦酸-丙烯酸共聚物对硫酸钙的阻垢性能研究

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水处理技术 2002年第2期28卷 86-88页

作者：赵彦生太原理工大学化学工程与技术学院山西太原030024

本文研究了异丙烯膦酸 -丙烯酸共聚物对硫酸钙的阻垢性能 ,探讨了共聚物浓度、钙离子浓度、硫酸根浓度、p H值、温度等因素对硫酸钙阻垢性能的影响 ,并用扫描电镜研究了不同共聚物用量下硫酸钙的结晶形态 ,在共聚物浓度为 2 0 mg/L时 ,... 详细信息

本文研究了异丙烯膦酸 -丙烯酸共聚物对硫酸钙的阻垢性能 ,探讨了共聚物浓度、钙离子浓度、硫酸根浓度、p H值、温度等因素对硫酸钙阻垢性能的影响 ,并用扫描电镜研究了不同共聚物用量下硫酸钙的结晶形态 ,在共聚物浓度为 2 0 mg/L时 ,硫酸钙晶体产生了严重的畸变 ;

关键词：异丙烯膦酸丙烯酸共聚物硫酸钙阻垢性能扫描电镜

Preparation of insoluble β-CD polymer and its application to enantiomers and isomers separation

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Journal of Central South university of technology 2001年第1期8卷 57-59页

作者： YI Jian ming 1,TANG Kuo wen 2 (1.college of chemistry and chemical engineering, Central South university, Changsha 410083, china 2.Department of chemical engineering, Yueyang Normal university, Yueyang 414000, china) 1. college of chemistry and chemical engineering Central South University 410083 Changsha China 2. Department of chemical engineering Yueyang Normal University 414000 Yueyang China

An insoluble β-cyclodextrin polymer cross-linked with epichlorohydrin was prepared, and its structure was identified with infrared spectrum. Colloid stationary phase was prepared by dissolving the polymer in the mixed solvent of diisopropyl ether, methylene dichloride and benzene and treated for 0.5 h by ultrasonication, and then was coated on a fused silica capillary column. The optimun reaction conditions are as follows: the mole ratio of epichlohydrin to β-cyclodextrin is 12.1:1, reacting at 65 °C for 24 h. The Chromatographic performance such as column efficiency, thermal stabilities and polarity were studied, two kinds of disubstituted benzene isomers and eight pairs of enantiomers were separated on the capillary column. The results show that the β-cyclodextrin polymer is suitable for use as a capillary gas chromatographic stationary phase, and possess excellent chromatographic properties in separating enantiomers and position isomers.

关键词： insoluble β cyclodextrin polymer capillary gas chromatography enantiomer position isomer separation

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

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

Applications of functionalized ionic liquids

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Science china chemistry 2006年第5期49卷 385-401页

作者： LI Xuehui1, ZHAO Dongbin2,3, FEI Zhaofu2 & WANG Lefu1 1. Department of chemical engineering, Guangdong Provincial Laboratory of Green chemical technology, South china Uni-versity of technology, Guangzhou 510641, china 2. Swiss Federal Institute of technology, Lausanne, EPFL, CH-1015 Lausanne, Switzerland 3. PKU Green chemistry Center, Beijing National Laboratory for Molecular Sciences, college of chemistry and Molecular engineering, Peking university, Beijing 100871, china 1. Department of chemical engineering Guangdong Provincial Laboratory of Green Chemical Technology South China University of Technology Guangzhou 510641 China 2. Lausanne EPFL Swiss Federal Institute of Technology CH-1015 Lausanne Switzerland 3. PKU Green chemistry Center Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular Engineering Peking University Beijing 100871 China

Recent developments of the synthesis and applications of functionalized ionic liquids (including dual-functionalized ionic liquids) have been highlighted in this review. Ionic liquids are at-tracting attention as alternative solvents in green chemistry, but as more functionalized ILs are pre-pared, a greater number of applications in increasingly diverse fields are found.

关键词： ionic liquids functionalized ionic liquids dual-functionallzed ionicliquids reaction media asymmetric synthesis nano-materials porous materials lubricants flue-gas desulfurization oil desul-furization

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

PERFORMANCE AND INITIATION MECHANISM OF ISOPROPYLTHIOXANTHONE IN SURFACE PHOTOGRAFTING

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Chinese Journal of Polymer Science 2000年第5期18卷 431-435页

作者： Wan-tai Yang Mei-zhen Yin Yu-feng Sun college of Material Science and engineering, Beijing university of chemical technology, Beijing 100029, china Beijing Univ Chem Technol Coll Mat Sci & Engn Beijing 100029 Peoples R China

In a polymerization model with low density polyethylene (LDPE) as the substrate and acrylic acid (AA) as the monomer, the performance of isopropylthioxanthone (ITX) in initiating surface photografting polymerization was evaluated. The results show that the reactivity of photopolymerization and photografting of ITX locate between benzophenone (BP) and benzildimethylketal (BDK) for polymerization, BDK > ITX > BP; for surface grafting polymerization, BP > ITX > BDK. These results can be explained by a reaction mechanism of the inter-molecular or intra-molecular hydrogen abstraction reaction of ITX.

关键词： photografting polymerization photopolymerization hydrogen abstraction reaction