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Kinetic theory of self-condensing vinyl polymerization

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Science china chemistry 2010年第12期53卷 2429-2439页

作者： ZHOU ZhiPing 1 & YAN DeYue 2 1 school of Materials Science and engineering,Jiangsu university,Zhenjiang 212013,china 2 school of chemistry and chemical engineering,Shanghai Jiao Tong university,Shanghai 200240,china school of Materials Science and engineering Jiangsu University Zhenjiang China school of chemistry and chemical engineering Shanghai Jiao Tong University Shanghai China

This review introduces the kinetic theory of self-condensing vinyl polymerization (SCVP),including the SCVP of AB inimers,the SCVP with non-equal reactivity between A and B groups,the SCVP in the presence of a small amount of multifunctional initiators,also the SCVP of both inimers and *** analytical expressions of various molecular parameters for the resulting hyperbranched polymers,such as the molecular size distribution function,the average molecular weight,the polydispersity index and the degree of branching,are reviewed systematically.

关键词： kinetic theory self-condensing vinyl polymerization (SCVP) hyperbranched polymers

Synthesis and Characterization of Polyaniline in Magnetic Field

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Journal of Wuhan university of Technology(Materials Science) 2008年第3期23卷 316-318页

作者：马利 College of chemistry and chemical engineering Chongqing University

Polyaniline was obtained by chemical oxidation in the microemulsion system consisting of aniline, emulsifier, assistant emulsifier and water in magnetic field （0 T, 0.2 T, 0.4 T, 0,6 T）. The effect of magnetic field on the polymerization rate and the inherent viscosity of polyaniline were studied. The molecular structure of polyaniline was characterized by IR spectra and the thermal degradation behavior was assessed using TG techniques. The results show that the polymerization rate, molecular weight, thermal stability and conductivity of the synthesized polyaniline enhanced and no effect on the basic structural units of polyaniline was observed in magnetic field, Within the range of the intensity of magnetic field studied, the magnetic field of 0.4 T exerts the largest influence on polymerization of aniline.

关键词： magnetic field polyaniline microemulsion polymerization conductivity

Electrochemical behavior of Cu(II) reduced in CH3OH and DMSO

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Rare Metals 2003年第3期22卷 210-214页

作者： SONG Jiguo, SONG Huacan, and YANG Qiqinschool of chemistry and chemical engineering, Zhongshan university, Guangzhou 510275, china school of chemistry and Chemicul engineering Zhongshan University Guangzhou 510275

The cyclic voltammetry and the potential-time curve after galvanostaticelectrolysis were used to study the electrode processes of Cu(II) in CH_3OH solution and DMSOsolution. The electroreduction of Cu(II) to Cu on a Pt electrode proceeds in two steps: Cu(II) + evelence Cu(I); Cu(I) + e velence Cu. The reduction potential of Cu(II) in DMSO solution is morenegative than that in CH_3OH solution, and the diffusion coefficient of Cu(II) ion in DMSO solutionis larger than that in CH_3OH solution because the polarity of DMSO is larger than that of CH_3OHobservably and has a stronger solvating power.

关键词： electrochemistry electroreduction of Cu(II) cyclic voltammetry diffusioncoefficient solvability

3D-QSAR studies on glycogen phosphorylase inhibitors by flexible comparative molecular field analysis

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Science china chemistry 2007年第4期50卷 568-573页

作者： ZHOU Peng1 & LI ZhiLiang1,2 1 College of chemistry and chemical engineering, chongqing university, chongqing 400044, china 2 State Key Laboratory of Chemo/Biosensing and Chemometrics, Changsha 410082, china College of chemistry and chemical engineering Chongqing University Chongqing China State Key Laboratory of Chemo/Biosensing and Chemometrics Changsha China

Canceling grids accommodating probes in comparative molecular field analysis (CoMFA), the idea of flexibleness is introduced into the CoMFA, and in combination with swarm intelligent algorithm which attempts to optimize distributions of diverse probes around drug molecules, a new 3D-QSAR method is proposed in this context as flexible comparative molecular field analysis (FCoMFA). In preliminary at-tempts to performing QSAR studies on 47 glycogen phosphorylase inhibitors, FCoMFA is employed and confirmed to be potent to exploring ligand-receptor interaction manners at active positions and thus to generating stable and predictable models. Simultaneously by an intuitive graphics regarding probe distribution patterns, impacts of different substituted groups on activities is also given an insight into.

关键词： flexible comparative molecular field analysis (FCoMFA) three-dimensional quantitative structure-activity relationship (3D-QSAR) particle swarm optimization algorithm (PSO) glycogen phosphorylase inhibitor probe distribution pattern

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 Xiangtan China

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

Synthesis and purification of trialkyl compounds of gallium and indium

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Rare Metals 2002年第1期21卷 1-6页

作者： SHU Wangen, ZHOU Zhongcheng and LI Xiong chemistry and chemical engineering College, Central South university, Changsha 410083, china chemistry and chemistry engineering College Central South University Changsha 410083 chemistry and chemical engineering College Central South University Changsha 410083

The The research progress in trialkyl compounds of gallium andindium was discussed from two aspect, one was the chemical synthesisof the compounds and the other was the purification of them. Thereare three synthesis routes be- ing reported in the first aspect, *** route staring form pure metal, the route starting from the puremetal trihalides, and the electrochemical route. In the secondaspect, the purifying methods of decomposition-distillation and zonerefining were reviewed.

关键词： trialkyl compounds gallium nd indium synthesis purification

Recognition behavior of chiral nanocomposites toward biomolecules and its application in electrochemical immunoassay

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Science china chemistry 2010年第6期53卷 1453-1458页

作者： FU YingZi1,CHEN Min1,CUI Xin2,WANG LiLan1,CHEN Qiao1 & ZHOU Juan1 1Key Laboratory on Luminescence and Real-Time Analysis,Ministry of Education College of chemistry and chemical engineering,southwest university,chongqing 400715,china 2Key Laboratory of Green chemistry & Technology,Ministry of Education College of chemistry,Sichuan university,Chengdu 610064,china Key Laboratory on Luminescence and Real-Time Analysis Ministry of Education College of chemistry and chemical engineering Southwest University Chongqing China Key Laboratory of Green chemistry & Technology Ministry of Education College of chemistry Sichuan University Chengdu China

The novel nanocomposites were obtained by covalently linking arginine enantiomers with the sidewall of multi-walled carbon nanotubes,and utilized as sensing materials for biomolecular recognition in electrochemical *** were characterized by X-ray photoelectron spectroscopy (XPS),transmission electron microscopy (TEM) and circular dichroism spectroscopy (CD).Nano-gold and Prussian Blue were employed to amplify the analytical signal *** specific antibody/antigen and carcinoembryonic antibody/antigen were used as model *** results showed that the different configurations of nanocomposites could readily facilitate chiral recognition of antibodies,and D-nanocomposites displayed a larger signal.

关键词： arginine multi-walled carbon nanotubes chiral nanocomposites recognition electrochemical immunoassay

Reversible folding/unfolding of small α-helix in explicit solvent investigated by ABEEMσπ/MM

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Science china chemistry 2009年第11期52卷 1917-1924页

作者： LIU Cui & YANG ZhongZhi chemistry and chemical engineering Faculty,Liaoning Normal university,Dalian 116029,china chemistry and chemical engineering Faculty Liaoning Normal University Dalian China

We have performed molecular dynamics simulations on the reversible folding/unfolding of small α-helix(short Ala based peptide Ala5) in explicit water solvent in terms of ABEEMσπ/MM.A dynamics analysis shows that the α-helical turn can be preserved up to a period of about 2 ns at 300 K,which supports the conclusions of Margulis et *** time trajectory of the root mean square deviation between the heavy atoms of the backbone and the helical reference structure indicate that "helix melting and formation occurs rapidly on a time scale of 0.1 ns at 300 K" is not a felicitous *** first quantificationally concluded that the helix nucleation can maintain 2 ns,1―1.5 ns and 0.8 ns for Ala5 at 300 K,400 K and 500 K,***,increasing temperature dose not alter the pathway of folding/unfolding,but change the *** analysis of structures in a "transition-state ensemble" shows that helix-to-coil transitions occurs predominantly through breaking of hydrogen bonds at the helix ends(92%),particularly at the C-terminus(50%).Hydrogen bonds' breaking and formation occurs on a time scale of 0.1 ns.

关键词： reversible folding/unfolding of protein Ala5 temperature hydrogen bond

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以人为本:基础教育课程改革的核心价值

教育发展研究 2010年第22期30卷 79-83页

作者：黄梅西南大学化学化工学院副教授重庆400715

以人为本是科学发展观的核心,也是指导基础教育改革的核心价值。新课程改革从人本的目标发展观、人道的课程实施观、人性的学生认识观、人文的评价功能观方面都体现了以人为本的价值诉求。课程改革中落实以人为本,就是处理好课程目标、... 详细信息

以人为本是科学发展观的核心,也是指导基础教育改革的核心价值。新课程改革从人本的目标发展观、人道的课程实施观、人性的学生认识观、人文的评价功能观方面都体现了以人为本的价值诉求。课程改革中落实以人为本,就是处理好课程目标、课程价值、课程开发、课程体系、课程内容中人与课程关系的问题,人个体发展的问题。

关键词：以人为本课程改革核心价值