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Self-assembly of indium phosphide with an urchin-like architecture through a hydrothermal route

Materials Letters 2012年 82卷 95-98页

作者： Hairui Liu Jian Liang Xuguang Liu Husheng Jia Bingshe Xu Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology) Ministry of Education Taiyuan 030024 Shanxi PR China College of Materials Science and Engineering Taiyuan University of Technology Shanxi 030024 PR China College of Chemistry and Chemical Engineering Taiyuan University of Technology Shanxi 030024 PR China

Urchin-like InP architectures were synthesized by hydrothermal route at 160 °C. The products were characterized with scanning electron microscopy, X-ray diffraction, spectrofluorometry. Results show that the hollow urchin-like InP microspheres with diameters of 40–70 μm were composed by numerous microrods with a diameter of about 0.5–2 μm. The obtained InP samples were of high purity zinc blende (cubic) structure. According to the analysis on the effects of reaction time on the morphologies, a possible formation mechanism of hollow urchin-like InP architectures was proposed. The optical properties of the urchin-like InP hollow microspheres were also investigated at room temperature, and results show that the urchin-shape InP microspheres displayed a strong emission at 599 nm, which is quite different from that observed in all previous reports related to the InP nano/micro structures.

关键词： InP Urchin-like architecture Hydrothermal method CTAB PL spectrum

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Omni-directional mirror for visible light based on one-dimensional photonic crystal

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Chinese Optics Letters 2011年第7期9卷 72-75页

作者：关慧欢韩培德杨艳青李玉平张雪张文婷 College of Materials Science and Engineering Taiyuan University of Technology Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education

The omni-directional reflection characteristics of one-dimensional photonic crystals composed of Ta2O5/MgF2 multi-quantum well （MQW） are studied using the transfer matrix method. An omnidirectional reflector consisting of three and four Ta2O5/MgF2 MQWs is investigated. Results show that the photonic band gap of the photonic crystal composed of three and four Ta2O5/MgF2 MQWs, which are within the wavelength ranges of 402-712 and 412-1,023 nm, respectively, could cover the entire visible region. The relationship among the width of the band gap, its location, reflectivity rate, and incident angle of the incident light is analyzed. The optimal structural parameters of the MQW of the omni-directional reflector in the visible region are also calculated. The calculations provide a guide for the design of omni- directional reflection devices in the visible region.

关键词： Omni-directional mirror for visible light based on one-dimensional photonic crystal MQW PBG Ta nm mode Figure

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Synthesis,crystal structures and characterization of a pair of Tb~Ⅲ-based enantiomers

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Journal of Rare Earths 2011年第1期29卷 28-31页

作者：方少明牛晓霞和来福户敏周立明高丽君李郤里 Henan Provincial Key Laboratory of Surface and Interface Science School of Materials and Chemical EngineeringZhengzhou University of Light Industry

A pair of novel Tb^III-based enantiomers, [Tb（dbm）·Lss] （1） and [Tb（dbm）***] （2）（where Lss=（＋）-4,5-pinene bipyridine, LRR= （-）-4,5-pinene bipyridine, dbm=dibenzoylmethanate）, were synthesized and characterized based on single crystal X-ray diffi＇action, elemental analysis, FT-IR, TG and CD spectra. X-ray diffraction analysis showed that both the complexes crystallized in monoclinic crystal system with P21 chiral space group. The Tb^III ion was eight-coordinated by six O atoms of three dbm ligands and two N atoms fi-om one chiral ligand Lss or LRR. The CD spectra revealed that complexes 1 and 2 were enantiomers. Thermogravimetric analysis results indicated that 1 and 2 were thermally stable up to 246 ℃.

关键词： enantiomers chirality rare earths terbium complex

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Durable polytetrafluoroethylene composites in harsh environments: Tribology and corrosion investigation

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Journal of Applied Polymer science 2012年第5期124卷 4307-4314页

作者： Mu, Liwen Chen, Jian Shi, Yijun Feng, Xin Zhu, Jiahua Wang, Huaiyuan Lu, Xiaohua Department of Interface and Molecular Simulation State Key Laboratory of Materials-oriented Chemical Engineering Nanjing University of Technology Nanjing 210009 China Department of Chemistry and Materials Science Institute of Science Nanjing Forestry University Nanjing 210037 China Chemical Engineering Department College of Chemistry and Chemical Engineering Daqing Petroleum Institute Daqing 163318 China

The tribological properties and mass loss of polytetrafluoroethylene (PTFE) composites filled with carbon fiber (CF) or potassium titanate whisker (PTW) after the immersion in 30% sulfuric acid solution for 5 or 15 days were studied under different temperatures (25, 50, and 75°C). Results show that PTW/PTFE composites exhibit better anticorrosive and antiwear properties than those of CF/PTFE composites. Acid immersion has no obvious effect on the wear rate of the PTW/PTFE composite. The wear rate of CF/PTFE immersed for 15 days is thrice as much that of untreated composites and 3.6 times as much that of PTW/PTFE composites. Results also indicate that the wear rate of PTFE composites increases with the increasing corrosive mass loss rate and is more dependent on the corrosive mass loss rate rather than the friction coefficient. © 2011 Wiley Periodicals, Inc.

关键词： Carbon fibers

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Preparation and coagulation efficiency of polyaluminium ferric silicate chloride composite coagulant from wastewater of high-purity graphite production

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Journal of Environmental sciences 2011年第7期23卷 1122-1128页

作者： Xiaoxia Niu Xili Li Jihong Zhao Yigang Ren Yanqin Yang Henan Provincial Key Laboratory of Surface and Interface Science School of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China

The aim of the present work was to produce a polyaluminium ferric silicate chloride （PAFSiC） coagulant from acidic and alkaline wastewater of purifying graphite by roasting, and subsequently to evaluate coagulation efficiency of the reagent by treating surface water from the Yellow River as well as municipal wastewater in comparison with the conventional coagulant polyaluminium chloride （PAC）. The PAFSiC coagulant was prepared by co-polymerization. The effects of （Al＋Fe）/Si molar ratio, OH/（Al＋Fe） molar ratio （i.e., γ value）, coagulant dosage and pH value of test suspension on the coagulation behavior of FAFSiC and the stability of the PAFSiC were also examined. Results showed that PAFSiC performed more efficiently than PAC in removing turbidity, chemical oxygen demand （COD）, and total phosphate （TP）. The PAFSiC with a γ value of 2.0 and （Al＋Fe）/Si ratio of 5 （PAFSiC 2.0/5） showed excellent coagulation effect for both turbidity and COD, while PAFSiC 1.0/5 was the best for TP. The optimum coagulation pH range of PAFSiC 2.0/5 was 5.0–9.0, slightly wider than that of PAC （6.0–8.0）. The process can be easily incorporated into high-purity graphite production plants, thereby reducing wastewater pollution and producing a valuable coagulant.

关键词： polyaluminium ferric silicate chloride industrial minerals recycling coagulant wastewater

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Growth Habit of Polar Crystal ZnO by Solid-vapor Method

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Journal of Wuhan University of Technology(Materials science) 2011年第1期26卷 19-22页

作者：马淑芳许并社 Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of Technology Ministry of Education College of Materials Science and Engineering Taiyuan University of Technology

Crystals of semiconductor ZnO were fabricated by means of solid-vapor growth method-carbon thermal reduction. Powder X-ray diffraction and field emission scanning electron microscope were used to characterize the phase and morphology of the samples. The results showed that the samples were wurtzite ZnO crystals and anisotropy of crystal growth relied on reaction temperature in solid-vapor process. The crystals synthesized at different temperatures were of short column-like shape, flat top hexagon pyramidal-like shape and polyhedron shape. The growth mechanisms of the above three kinds of crystal were consistent with the theory of growth basic structural unit of negative ion coordination polyhedron. At first, Zn2＋ and four O2- form [Zn-O4]6- coordination tetrahedron at any temperature. Then, tetrahedrons stack in different ways into different morphology crystal at different temperatures.

关键词： zinc oxide polar crystal micro-morphology polyhedron growth mechanism

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Building Fluorescent DNA Nanodevices on Target Living Cell Surfaces†

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Angewandte Chemie 2013年第21期125卷

作者： Guizhi Zhu Shengfeng Zhang Erqun Song Jing Zheng Rong Hu Xiaohong Fang Weihong Tan Molecular Science and Biomedicine Laboratory State Key Laboratory of Chemo/Bio‐Sensing and Chemometrics College of Biology and College of Chemistry and Chemical Engineering Collaborative Innovation Center for Chemistry and Molecular Medicine Hunan University Changsha 410082 (China) Center for Research at Bio/Nano Interface Department of Chemistry and Department of Physiology and Functional Genomics Shands Cancer Center UF Genetics Institute and McKnight Brain Institute University of Florida Gainesville FL 32611‐7200 (USA) Key Laboratory of Luminescence and Real‐Time Analysis of the Ministry of Education College of Pharmaceutical Sciences Southwest University Chongqing 400715 (China) Beijing National Laboratory for Molecular Sciences Key Laboratory of Molecular Nanostructures and Nanotechnology Collaborative Innovation Center for Chemistry and Molecular Medicine Institute of Chemistry Chinese Academy of Sciences ZhongGuanCun North 1st Street Beijing 100190 (China)

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Electronic Structures and Spectroscopic Properties of a Novel Iridium (Ⅲ) Complex with an Ancillary Ligand 2-(4-Trifluoromethyl -2-Hydroxylphenyl)Benzothiazole

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Chinese Physics Letters 2011年第6期28卷 86-89页

作者： LEI Li-Ping HAO Yu-Ying FAN Wen-Hao XU Bing-She Department of Physics and Optoelectronics Taiyuan University of TechnologyTaiyuan 030024 Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyTaiyuan 030024

Iridium(Ⅲ)complexes with 2−phenylpyridine(ppy)have been demonstrated as a type of promising phosphorescence dopant in emitting layers of organic light emitting diodes(OLEDs).In most iridium(III)complexes,there exist the strong spin−orbit coupling betweenπ−orbitals of cyclometalated ligands and 5d orbitals of the centric *** study a novel iridium(Ⅲ)complex(ppy)2Ir(4−TfmBTZ)with ppy as cyclometalated ligands and 2-(4-trifluoromethyl-2-hydroxylphenyl)benzothiazole(4-TfmBTZ)as an ancillary ligand using the Gaussian 03 *** geometries,electronic structures and spectroscopic properties of this iridium(Ⅲ)complex are investigated by density functional theory(DFT)and time−dependent density functional theory(TD-DFT).The results show that the spin-orbit coupling occurs not only between ppy and iridium atom but also between 4-TfmBTZ and iridium atom in this *** highest occupied molecular orbital is dominantly localized on the Ir atom and 4-TfmBTZ ligand,while the lowest unoccupied molecular orbital on 4-TfmBTZ *** triplet lowest-lying transition is attributed to the Ir-to-4-TfmBTZ charge-transfer(3MLCT)transition while the sub−low-lying transitions are assigned to the 3MLCT transitions of Ir(ppy)*** nature of the lowest unoccupied orbital changes from ppy−localized to 4-TfmBTZ-localized and reveals that phosphorescent color of Ir(Ⅲ)complex can be controlled by the ancillary ligand and substituent.

关键词： complex orbital occupied

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Synthesis of nanometric LiFePO4 materials in liquid phase: effects of precipitation method and calcination temperature

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Gongneng Cailiao/Journal of Functional Materials 2012年第17期43卷 2347-2350页

作者： Xing, Yu Xu, Bei Liu, Zhen-Xin Li, Chao Zhang, Ai-Qin Zhang, Lin-Sen Wang, Li-Zhen Fang, Shao-Ming Henan Provincial Key Laboratory of Surface and Interface Science School of Materials and Chemical Engineering Zhengzhou University of Light Industry Zhengzhou 450002 China

The intrinsic defects of solid-state synthesis make the derived lithium iron phosphate products difficult to be mass applied to the field of power grade Li-ion batteries. However, liquid phase synthetic routes including precipitation and hydrothermal synthesis were playing more and more important roles. Nanometric LiFePO4 materials are prepared by various precipitation methods. The samples were characterized by powder X-ray diffraction, field-emission scanning electron microscopy, and automatic charge-discharge measurement. The results were analyzed to select the best precipitation method. The mechanism involved in the performance differences among the prepared LFP materials were explained. The effects of calcination temperature on the average particle size, the particle size distribution, and the crystallite morphology were studied in details.

关键词： Iron compounds

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Synthesis and luminescence properties of the Eu(III) complex

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2012年第3期23卷 527-533页

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

The red light fluorescent powder of Eu-benzoylacetone-1, 10-phenanthrolin used in white light emitting diode (WLED) is synthesized. The structure and properties of the complex are characterized by FT-IR spectrometry, UV-vis spectrometry, Fluorescence spectrometry, fluorescence lifetime and thermogravimetric analysis. The results suggest that the ligands have coordinated with Eu(III) ion. The absorption of complexes mainly comes from the ligands absorption. The complex emits characteristic red light at 611 nm excited by 365 nm ultraviolet light. The result indicates that the complex is a photoluminescence fluorescent powder excited by 365 nm ultraviolet light. The fluorescence lifetime of the complex is 5.033×10-4 s. The quantum yield is 68.4%. The decomposition temperature of complex is near 250°C, meeting the requirement of working temperature of white LED. In addition, the singlet and triplet energy levels of the ligands are calculated by quantum chemistry, and the luminous mechanism of the complex is explored.

关键词： Energy transfer

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