检索结果-内蒙古大学图书馆

Beijing Keji Daxue Xuebao/Journal of University of science and Technology Beijing 2013年第10期35卷 1353-1359页

作者： Zhang, Yong Li, Guang-Yin Gao, Hai-Li Zhang, Jian Huang, Shu-Rong Wang, Li-Zhen Song, Yan-Hua Department of Material and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China Henan Provincial Key Laboratory of Surface and Interface Science Zhengzhou 450002 China Mechanical Power Company AVIC Aircraft Corporation Hanzhong Aircraft Company Hanzhong 723215 China Refined Station AVIC Aircraft Corporation Hanzhong Aircraft Company Hanzhong 723215 China

MnO2 powders with micro/nano spheres and microrods for supercapacitors were synthesized via a simple, quick and low-temperature hydrothermal method. Their preparation process was optimized by orthorhombic test and single factor experiment. The crystalline structure, surface morphology and supercapacitive properties of the as-prepared MnO2 powders were studied by X-ray diffraction, scanning electron microscopy and electrochemical measurement. Experimental results show that the optimal reaction conditions are the reaction temperature of 150°C, the KMnO4/MnCl2 molar ratio of 2.5: 1.0, the reaction time of 3 h, and the filling factor of 40%. Under the optimal conditions, the as-prepared MnO2 powders have typical α-MnO2 structure with hollow and porous micro/nano spheres and microrods. The α-MnO2 micro/nano sphere diameter is about from 0.2 to 0.8 μm, while the α-MnO2 microrods have the diameter of 30 nm and the length of 5 μm. The discharge specific capacitance of products at the 5th discharge cycle retains 255, 170, 133, 105 and 88 F·g-1 at current densities of 100, 150, 200, 250 and 300 mA·g-1, respectively. Moreover, the values of equivalent series resistance and charge transfer resistance decrease to 0.37 Ω and 0.40 Ω, respectively.

关键词： Scanning electron microscopy

来源：评论

学校读者我要写书评

暂无评论

Preparation and Self-assembly of Chitosan/Carbon Microsphere Composite

引用

Journal of Wuhan University of Technology(Materials science) 2012年第3期27卷 454-458页

作者：杨永珍刘旭光 Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education Research Center on Advanced Materials Science and Technology Taiyuan University of Technology College of Chemistry and Chemical Engineering Taiyuan University of Technology

Carbon-based films were synthesized by self-assembly of chitosan-encapsulated carbon microsphere （CMS@CS） composite. First, carbon microspheres （CMSs） prepared by chemical vapor deposition were modified by HNO3 and H2O2. Second, oxidized CMSs were modified by chitosan （CS）. Finally, CMS@CS was self-assembled by vertical deposition, in which suspension concentration and deposition temperature on the quality of self-assembling film were investigated. Field emission scanning electron microscopy, atomic force microscopy, X-ray diffraction, thermogravimetry, and Fourier transformation infrared spectrometry were employed to characterize the morphology and structure of the samples. The results show that CMSs modified by CS had uniform particle size and good dispersion, CMS@CS was self-assembled into a dense film, the film thickened with increasing suspension concentration at fixed temperature, and more ordered film was obtained at 1 wt% of suspension concentration and 50 ℃. The ultraviolet-visible absorption spectra show that the absorbance of CMS@CS film grew steadily with increasing suspension concentration and that the CMSs with oxygen-containing groups have a good assembling performance to form composite films with CS.

关键词： carbon film carbon microspheres chitosan vertical deposition self-assembly

来源：评论

学校读者我要写书评

暂无评论

Spectroscopic Ellisposmetry of ultra-thin films of Zinc oxide formed on Zn metal

Spectroscopic Ellisposmetry of ultra-thin films of Zinc oxid...

引用

中国化学会第十七次全国电化学大会

作者： Juan Zuo Ying Chen Changjian Lin Andreas Erbe School of Materials Science and Engineering. Xiamen University of Technology.XiamenFujian361024 Department of Interface Chemistry and Surface EngineeringMax-Planck-Institut für Eisenforschung GmbHDüsseldorfGermany State Key Laboratory of Physical Chemistry of Solid Surfacesand College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005

来源：评论

学校读者我要写书评

暂无评论

Effect of rolling and heat treatment on microstructure and mechanical properties of Mg3.5Y0.8Ca0.4Zr alloy

引用

Journal of Rare Earths 2012年第11期30卷 1146-1149页

作者：樊建锋陈志远马跃宇韩刚许并社董洪标 Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of Technology Shanxi Research Center of Advanced Materials Science and Technology College of Materials Science and Engineering Taiyuan University of Technology General Research Institute for Non-ferrous Metals

The effect of rolling and heat treatment on microstructure and mechanical properties of Mg3.5Y0.8Ca0.4Zr alloy was investigated. With the addition of 0.4Zr, the average grain size of the as-cast alloy was markedly refined to 5-10 μm. After hot rolling process, the grain size of Mg3.5Y0.8Ca0.4Zr alloy was refined further into 3-5 lain and the tensile strength was enhanced while the plasticity was degraded because the accumulation of rolling reduction increased the density oft-wins, and refined the grain structures. After the solution heat treatment at 743 K, the elongation of alloy was greatly enhanced from 3% to 17%.

关键词： magnesium alloy plastic deformation heat treatment mechanical properties rare earths

来源：评论

学校读者我要写书评

暂无评论

Effect of yttrium,calcium and zirconium on ignition-proof principle and mechanical properties of magnesium alloys

引用

Journal of Rare Earths 2012年第1期30卷 74-78页

作者： FAN Jianfeng CHEN Zhiyuan YANG Weidong FANG Shuang XU Bingshe Key laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China Shanxi Research Center of Advanced Materials Science and Technology Taiyuan University of TechnologyTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China

Good ignition-proof principle and mechanical properties were realized in Mg-Y-Ca-Zr alloy *** adding Y and Ca elements,the ignition point of Mg-3.5Y-0.8Ca alloy was improved to over 1173 K,and the alloy could be melted in air without any *** ef-fect of Zr addition on the microstructures and mechanical properties of Mg-3.5Y-0.8Ca alloys were investigated,and Mg-3.5%Y-0.8%Ca-0.4%Zr alloy had good comprehensive properties with tensile strength of 190 MPa and elongation of 11%.Auger electron spectros-copy（AES） and X-ray diffraction（XRD） analysis revealed that the oxide film formed on the surface of Mg-3.5Y-0.8Ca alloy was mainly composed of *** measurements in dry air indicated that the oxidation dynamics curves measured at 773,873 and 973 K followed the cubic ***,the semiconductor characteristic of Y2O3 film and its effect on ignition-proof properties of Magnesium al-loys were discussed from the viewpoint of electrochemistry.

关键词： magnesium alloys ignition proof principle mechanical properties rare earths

来源：评论

学校读者我要写书评

暂无评论

DFT Studies of Ag-Loading Intrinsic and Functionalized Single-Walled Carbon Nanotubes (vol 30, pg 121, 2012)

引用

CHINESE JOURNAL OF CHEMISTRY 2012年第5期30卷 1192-1192页

作者： Zhang Zhuxia Hao Yaxian Wang Liping Dong Minghui Hou Wensheng Han Peide Liu Xuguang Xu Bingshe Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology) Ministry of Education Taiyuan Shanxi 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan Shanxi 030024 China College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan Shanxi 030024 China

The first principles study was performed on the stability of Ag adsorbed on the internal walls of single‐walled carbon nanotube (SWCNT) and loaded on acid modified SWCNT. The calculation results show that Ag can be adsorbed stably on the internal walls of SWCNT. With the increase of SWCNT diameter, the adsorption energy increases in a certain range. Ag can also be loaded on the modified SWCNT surface in the form of COOAg and OAg groups, and COOAg group is more stable than OAg group. For either the adsorption on the inner SWCNT or the load on the modified SWCNT surface, only a small proportion of the Ag ions can be stably bonded to the walls of SWCNT.

关键词： ab initio calculations adsorption intrinsic and functionalized single‐walled carbon nanotubes

来源：评论

学校读者我要写书评

暂无评论

Worm-like Ag/ZnO core-shell heterostructural composites: Fabrication, characterization, and photocatalysis

引用

Journal of Physical Chemistry C 2012年第30期116卷 16182-16190页

作者： Liu, H.R. Shao, G.X. Zhao, J.F. Zhang, Z.X. Zhang, Y. Liang, J. Liu, X.G. Jia, H.S. Xu, B.S. Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education Taiyuan Shanxi 030024 China College of Materials Science and Engineering Taiyuan University of Technology Taiyuan Shanxi 030024 China College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan Shanxi 030024 China

Novel worm-like Ag/ZnO core-shell heterostructural composites were fabricated using a two-step chemical method. As-prepared silver nanowires were soaked in a solution of zinc acetate and triethanolamine to form worm-like Ag/ZnO core-shell composites under ultrasonic irradiation. Samples were characterized by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), photoluminescence spectroscopy, and UV-vis spectrophotometer. The results show that the core-shell composites are composed of single-crystal Ag nanowires serving as the core, on which dense ZnO particles grow as the shell. The surface plasmon absorption band of Ag/ZnO composites is distinctly broadened and red shifted to monometallic Ag nanowires. The PL intensity of Ag/ZnO heterostructural composites varies and has the minimum intensity for the sample prepared with Ag of 2.8 atom %. Moreover, photocatalytic tests show that the Ag/ZnO composites exhibit higher photocatalytic activity compared to pure ZnO particles. © 2012 American Chemical Society.

关键词： Zinc oxide

来源：评论

学校读者我要写书评

暂无评论

How will carbon material lead to a Low Carbon Society – A review of Carbon 2012

引用

Carbon 2013年 51卷 438-438页

作者： Xu-guang Liu College of Chemistry and Chemical Engineering Taiyuan University of Technology Taiyuan Shanxi 030024 China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education Taiyuan Shanxi 030024 China

A review is given of the Annual World Conference on Carbon, which was held on June 17–22, 2012 in Krakow, Poland and organized by the Polish Carbon Society. In this conference, 5 plenary lectures, 30 keynote lectures, 220 oral presentations and 465 posters were divided into 10 topics, i.e., carbons for energy storage; carbons for health and environmental protection; precursors, processing and technology; carbon nanomaterials; porous carbons; carbon-based composites; graphene; new methods for carbon characterization; computation and modeling; and industrial news. Besides traditional modification on surface area and porosity, doping with hetero atoms such as N, B and P or compositing with metals or metal oxides have been developed into effective means for modifying carbon materials for improved adsorption, catalysis and energy-storage performance. The applications of novel carbon structures like nanotubes are still limited by the controllable and scalable preparation, processability and reactivity. Research on the structure and properties of graphene is moving from curiosity-oriented to application-oriented. Mathematical formulation or modeling of pore structures has been promoted by the progress in characterization methods. The modification of the surface/interface in carbon materials, which plays important roles in determining their physical, chemical or mechanical properties is still a focus of research activity in carbon materials.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Research Development for Morphology and Function of GaN with Different Metal Catalysts

引用

Procedia engineering 2012年 27卷 1744-1751页

作者： Lin Zhu Hua Zhang Chunyan Yu Junfu Zhao Jian Liang Shufang Ma Bingshe Xu Education Key Laboratory of Interface Science and Engineeringin Advanced Materials TaiYuan 030024 China College of Material Science and Engineering of TYUT TaiYuan 030024 China

GaN nanomaterials are displaying infinite develop potential in blue light-emitting diode (LED).Therefore, the preparation of low-cost and high-powered GaN nonmaterial has been one of the focuses for scientific researchers. It is known that different catalysts have different impacts on the surface and function of GaN in the process of preparation. Therefore the proper catalysts must be selected to grow GaN nanostructure with high-quality and performance. In the present study, the effects of different catalysts on the surface and function of GaN have been summarized. Those catalysts includes Ni, In, Au, Ag, and so on. Furthermore, the advantages and disadvantages of those catalysts have been overviewed.

关键词： metal catalysts GaN nano materials eresearch development

来源：评论

学校读者我要写书评

暂无评论

Methodology for prediction of triplet energy level of the ligands of Tb3+ by quantum chemistry calculation

引用

Gongneng Cailiao/Journal of Functional Materials 2012年第2期43卷 253-256+260页

作者： Zhang, Ai-Qin Pan, Qi-Liang Jia, Hu-Sheng Xu, Bing-She College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Key Laboratory of Materials Interface Science and Engineering Ministry of Education Taiyuan University of Technology Taiyuan 030024 China

Three Tb (III) complexes were synthesized using 2-aminobenzoic acid (HL) as primary ligand and 1,10-phenanthroline (Phen) and triphenylphosphine oxide (TPPO) as neutral ligand. The structure of the complexes was characterized with IR spectrum. The result shows that both amino and carboxyl were coordinated with Tb (III) ion, and Phen and TPPO were coordinated with Tb (III) ion. The luminescent properties were studied by UV-Vis absorption spectrometry and fluorescence spectrometry. Luminescent intensity has the order of Tb(L)3(TPPO)2>Tb(L)3 (H2O)2>Tb(L)3(Phen). The highest occupied molecular orbital (HOMO), the lowest unoccupied molecular orbital (LUMO), and the singlet and triplet energy levels of ligands were calculated by quantum chemistry calculation. Energy transfer process was researched into the Tb (III) complexes with different neutral ligands.

关键词： Energy transfer

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：