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Adsorption of cationic red X-GRL from aqueous solutions by graphene: Equilibrium, kinetics and thermodynamics study

Chemical and Biochemical Engineering Quarterly 2011年第4期25卷 483-491页

作者： Li, Y.H. Liu, T. Du, Q. Sun, J. Xia, Y. Wang, Z. Zhang, W. Wang, K. Zhu, H. Wuc, D. Laboratory of Fiber Materials and Modern Textile Growing Base for State Key Laboratory Qingdao University 308 Ningxia Road Qingdao 266071 China College of Electromechanical Engineering Qingdao University 308 Ningxia Road Qingdao 266071 China Key Laboratory for Advanced Manufacturing by Material Processing Technology Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Graphene was prepared and used as an adsorbent for removal of cationic red X-GRL from aqueous solutions. The physico-chemical properties of graphene were characterized by the transmission electron microscope (TEM), the Brunauer-Emmett-Teller (BET) specific surface area measurement, atomic force microscope (AFM), and Raman microscope. The adsorption properties of cationic red X-GRL onto graphene were studied as a function of pH, adsorbent dosage, contact time, and temperature. Kinetic data were well fitted by a pseudo second-order model. Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants. Equilibrium data agreed very well with the Langmuir model. Thermodynamic studies showed that the adsorption was a spontaneous and endothermic process.

关键词： Kinetics

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Preparation, Characterization and Dielectric Properties of Sr_5RTi_3Ta_7O_(30) (R=Pr and Eu) Ferroelectric Ceramics

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Journal of Wuhan University of technology(materials Science) 2010年第2期25卷 291-294页

作者：胡长征方亮 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of Technology

Polycrystalline samples of Sr5PrTi3Ta7O30 （SPTT） and Sr5EuTi3Ta7O30 （SETT） compounds were prepared by high-temperature solid-state reaction method and their formation, structure and dielectric properties were studied. They are found to be ferroelectric phase of filled tetragonal tungsten bronze （TB） structure at room temperature and undergoes diffuse type of ferroelectric-paraelectric phase transition around 34 ℃ and 31 ℃, respectively. At 1 MHz SPTT exhibits high dielectric constants of 177 and low dielectric losses of 3.5×10^-4 and SETT has high dielectric constants of 125 and low dielectric losses of 2.4×10^-3.

关键词： dielectrics ceramic ferroelectric tungsten-bronze

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Calculation of the thermal conductivity of L2SrAl2O7 (L= La, Nd, Sm, Eu, Gd, Dy)

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Physical Review B 2011年第2期84卷 024302-024302页

作者： Jing Feng Chunlei Wan Bing Xiao Rong Zhou Wei Pan David R. Clarke State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 P. R. China Key Laboratory of Advanced Materials of Precious-Nonferrous Metals Education Ministry of China Kunming University of Science and Technology Kunming 650093 P. R. China Department of Physics School of Science and Engineering Tulane University LA 70118 USA School of Engineering and Applied Science Harvard University Cambridge MA 02138 USA

Density functional perturbation theory, combined with quasi-harmonic approximation theory and the Debye theory, has been used to calculate the thermal conductivity of the double-perovskite perovskite slab–rocksalt layer oxide compounds L2SrAl2O7 (L = La, Nd, Sm, Eu, Gd, and Dy), a promising class of high-temperature thermal insulators. The predicted properties are compared with experimental data and show excellent agreement from room temperature up to 1000 °C. This indicates that the methodology is an effective approach to calculating the thermal conductivity of complex, defect-free crystal structures.

关键词： PERTURBATION (Quantum dynamics) OXIDE minerals PEROVSKITE CHEBYSHEV systems FUNCTIONAL analysis

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The investigation of PMS-PNW-PZT piezoelectric ceramics

The investigation of PMS-PNW-PZT piezoelectric ceramics

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12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18

作者： Dong, Zhang Weibing, Ma Qingchi, Sun Hongye, Gao Yong, Zhang Key Laboratory for Advanced Ceramics and Machining Technology of Ministry of Education School of Materials Science and Engineering Tianjin University Tianjin 300072 China State Key Laboratory of New Ceramic and Fine Processing Tsinghua University China

Pb0.95Sr0.05[(Mn1/3Sb2/3) 0.06(Ni1/2W1/2)x(Zr 0.49Ti0.51)1-x-0.06]O3 (PMS-PNW-PZT) (x = 0.01∼0.04) were prepared by using traditional technique with solid reaction process. The effects of PNW contents and sintering temperatures on microstructure, dielectric and piezoelectric properties of PMS-PNW-PZT ceramics were investigated. When the amount of doping content was about 2 mol% and the sintering temperature was 1250°C, the optimum values of buck density, mechanical quality factor, dielectric loss, piezoelectric constant, dielectric constant, planar coupling coefficient were obtained as follows:ρ = 7.54 g/cm3, Qm = 2800, tanδ = 0.27%, d33 = 360pC/N, Ε3T3/Ε0 = 1990, kp = 0.63, which can meet the requirements of piezoelectric transformers.

关键词： Piezoelectric ceramics

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Structure Characterization calculation of Tetragonal Zirconia

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IOP Conference Series: materials Science and Engineering 2011年第20期18卷

作者： J Feng X Y Wang X R Ren Z C Huang R Zhou W Pan State Key Laboratory of New Ceramics and Fine Processing Department of Materials Science and Engineering Tsinghua University Beijing 100084 P R China Key Laboratory of Advanced Materials of Precious-Nonferrous Metals Education Ministry of China Kunming University of Science and Technology Kunming 650093PRChina

Structure characterization and elastic properties of tetragonal phase of zirconia have been investigated by density functional theory (DFT). The XRD spectrums and vibration properties of Raman active modes of T-ZrO2 were calculated and the results were compared with references. The calculated results have showed researchers may distinguish cubic and tetragonal phases used XRD spectrums in the 2 range of 72.5°-75.5°, 122°-129° and 138°-148°. The calculated vibrated properties of Raman active modes as follows: the modes of Zr-O stretching are 262.6, 486.2, and 641.6 cm−1 the modes of Zr-O bending and O-O coupling are 344.4 and 606.9 cm−1 and the modes of Zr-O-Zr or O-Zr-O bending is 141.2 cm−1.

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Thermal Expansion Behavior of Hexagonal ZnS Single-Crystal Nanowires Embedded in Anodized Aluminum Oxide Template

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Chinese Physics Letters 2010年第10期27卷 168-171页

作者：于彦龙郑立辉徐鑫孙宏宇 Department of Applied Technology Daqing Petroleum Institute Qinhuangdao 066004 Beijing National Center for Electron Microscopy The State Key Laboratory of New Ceramics and Fine Processing. Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084

The thermal expansion behavior of semiconductor single-crystal nanowire arrays is of importance for their applications in electronic and optoelectronic nanodevices. We prepare hexagonal ZnS single-crystal nanowire arrays growing along the [110] direction via electrodeposition. The thermal expansion properties of the as-prepared ZnS nanowires have been studied by in situ x-ray diffraction method. The thermal expansion coefficient （TEC） of the ZnS nanowires decreases consistently from room temperature to 225℃ where it reaches a minimum value, and then increases rapidly. The average TEC in the studied temperature range is 4.74 × 10-6/℃, which is smaller than that of the conventional bulk counterpart.

关键词： THERMAL expansion NANOWIRES ELECTROFORMING ZINC sulfide TEMPERATURE effect DOPED semiconductors OPTOELECTRONIC devices

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An approach to improve the piezoelectric property of (Bi0.5Na0.5)TiO3-(Bi0.5K0.5)TiO3-BaTiO3 and Li-doped BNBK-based lead-free piezoelectric ceramics

An approach to improve the piezoelectric property of (Bi0.5N...

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2010年无铅高性能压电材料国际研讨会(IWLFFM-2010)

作者： Ye-Jing Dai Shujun Zhang Thomas R.Shrout Xiao-Wen Zhang Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education School of Materials Science and Engineering Tianjin University Tianjin 300072 PR China Materials Research Institute Pennsylvania State University University Park Pennsylvania 16802 USA The State Key Laboratory of New Ceramics and Fine Processing

ad-free piezoelectric ceramics of a(Bi0.5Na0.5)TiO3-b(Bi0.5K0.5)TiO3-cBaTiO3 (BNBK) ternary system near the composition of MPB has been widely investigated in recent decades.

关键词： Lead-free piezoelectric BNBK MPB

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Effect of Co2O3-doped on dielectric properties of tungsten-bronze structure ceramic Ba4Eu2Fe2Nb8O3030

Effect of Co2O3-doped on dielectric properties of tungsten-b...

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IEEE International Symposium on Applications of Ferroelectrics (ISAF)

作者： X.Y. Peng L. Fang C.C. Li C.Z. Hu B.L. Wu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan China Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of Technology GLITE Guilin China Guilin University of Technology Guilin Guangxi CN

In present work, undoped and Co 2 O 3 -doped Ba 4 Eu 2 Fe 2 Nb 8 O 30 ceramics were fabricated by routine solid state method. Wide temperature range measurement shows two kinds of dielectric peaks. The low-temperature peak attributes to ferroelectric-paraelectric phase transition. The high-temperature peak is affected greatly by Co 2 O 3 additives. With increasing the content of Co 2 O 3 dopant the second peak vanished, indicating that it is related to space charge.

关键词： Dielectric materials Ceramics Educational technology Temperature measurement Dielectric measurements Ferroelectric materials Temperature distribution Niobium compounds Laboratories Permittivity

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CIS(CIGS) thin films prepared for solar cells by one-step electrodeposition in alcohol solution

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Journal of Physics: Conference Series 2009年第1期152卷

作者： Long, Fei Wang, Weiming Du, Jingjing Zou, Zhengguang State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing Wuhan University of Technology Hubei Wuhan 430070 China Key Laboratory of Nonferrous Materials and New Processing Technology Ministry of Education Guilin University of Technology Guangxi Guilin 541004 China

The precursors of CIS and CIGS thin films were prepared by one-step electrodeposition in alcohol solution and then annealed in Ar atmosphere at 550°C for 30min. The influences of deposition potentials and salt concentrations on the morphology and composition of the thin films were studied in details. The films were characterized by X-ray diffraction(XRD), scanning electron microscopy(SEM), and energy-dispersive X-ray spectroscopy(EDS). The results show that annealed films have pure CIS or CIGS phases with good crystallization and the morphology of the films are very uniform and dense. The high quality precursor films were obtained using optimized deposition parameters. Moreover the electrodeposition mechanism of CIS thin films was briefly discussed. © 2009 IOP Publishing Ltd.

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The effect of poly(vinyl alcohol) hydrolysis on the properties of its blends with nylon 6

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Polymer Engineering and Science 2009年第8期49卷 1553-1561页

作者： Cui, Li Fu, Qiang Chang, Chang-Jung Yeh, Jen-Taut Key Laboratory of Green Processing and Functional Textiles of New Textile Materials Wuhan University of Science and Engineering Ministry of Education Wuhan 430073 China Department of Chemistry State Key Laboratory of Polymer Materials Engineering Sichuan University Chengdu 610065 China Department of Polymer Engineering National Taiwan University of Science and Technology Taipei Taiwan Faculty of Material Science and Engineering Hubei University Wuhan China

An investigation of the properties of the blends of nylon 6(PA6) and poly(vinyl alcohol) (PVA) with varying degrees of hydrolysis was conducted. A near disappearance of the characteristics of the α-form PVA crystals, crystallization exotherms, and hydrogen-bonded hydroxyl groups and the tensile properties originally associated with the PVA molecules of PA6 xPVA98y, PA6xPVA95y, and PA6xPVA6y specimens was observed as the PVA contents of the specimens became equal to or less than their corresponding "critical" values at 16.7 wt%, 33.3 wt%, and 50 wt%, respectively. These results support the idea that PVA molecules are miscible with PA6 molecules to some extent at the molecular level as the PVA contents of the blends become equal to or less than their corresponding critical PVA contents. In this article, we have proposed the possible reasons accounting for these properties of the PA6xP-VAy series specimens with a varying degree of hydrolysis. POLYM. ENG. SCI., 49:1553-1561, 2009.© 2009 Society of Plastics Engineers.

关键词： Hydrolysis

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