检索结果-内蒙古大学图书馆

Facile synthesis of Uniform Hollow Hematite Sub-micro Spheres with Controllab.e Shell Thickness

Journal of Wuhan University of technology(materials Science) 2010年第1期25卷 32-38页

作者：闫共芹官建国 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A simple method was developed to prepare the uniform hematite hollow submicro-spheres with controllab.e structure and different diameter based on monodisperse poly（styrene-co-acrylic acid） [P（St-co-AA）] particles. The structure and formation mechanism of the hollow spheres were investigated in detail. The control mechanism of shell thickness was also discussed. The results indicated that the shell thickness and coarseness of the synthesized core-shell hematite hollow spheres could be tuned simply by the surface carboxyl content of the P（St-co-AA） particles. This method provided a new approach for the structure control in the preparation of hollow spheres. A Brunauer-Emmett-Teller （BET） test shows that the prepared hollow spheres have large surface areas which were decreased along with the increase of the diameter. The magnetic properties of the as-obtained hematite hollow spheres were investigated. The result showed that the coercivity and saturated magnetization were increased along with the increase of the shell thickness, and the remanent magnetization was increased along with the decrease of the diameter.

关键词： hollow spheres hematite shell thickness BET special surface area magnetization properties

来源：评论

学校读者我要写书评

暂无评论

Interfacial Charge Transfer in ZnO/COF S-Scheme Photocatalyst via Zn─N Bond

引用

advanced materials 2025年 e2505088页

作者： Meng, Kai Zhang, Jianjun Zhu, Bicheng Jiang, Chuanjia García, Hermenegildo Yu, Jiaguo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Material Science and Engineering Wuhan University of Technology Wuhan430070 China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430078 China College of Environmental Science and Engineering Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution Control Nankai University Tianjin300350 China Universitat Politècnica de València Valencia46022 Spain

Photocatalysis is a promising solution to global energy shortage and environmental problems. Inspired by photosynthesis, multicomponent heterostructured photocatalysts are extensively investigated, and step-scheme (S-scheme) heterojunction has emerged as the theoretical basis for delineating charge transfer processes in predominant heterostructured photocatalysts. However, the specific charge transfer pathway across an S-scheme heterojunction remains elusive from an atomic/molecular perspective. Herein, it is demonstrated that in S-scheme heterojunction photocatalysts composed of imine-based covalent organic frameworks and nanostructured zinc oxide, interfacial Zn─N bonds are formed between the two components and play critical roles as a charge transfer gateway in the S-scheme heterojunction, based on theoretical calculations, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy. Moreover, mechanisms for enhanced charge transfer across the S-scheme heterojunction are elucidated using femtosecond transient absorption spectroscopy. This work provides new insights into molecular-level understanding of charge transfer mechanisms in S-scheme heterojunction photocatalysts for promoting energy and environmental applications of artificial photosynthesis. © 2025 Wiley-VCH GmbH.

关键词： Transient absorption spectroscopy

来源：评论

学校读者我要写书评

暂无评论

Fluoridation and Sintering of Hydroxyapatite material and Their Mechanical Properties

引用

Journal of Wuhan University of technology(materials Science) 2014年第1期29卷 190-196页

作者： Muhammad Asif 付正义 WANG Weimin WANG Hao TAN Tiening Shahzad Ahmad Khan State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

In the current work hydroxyapatite Ca10(PO4)6 ·OH2(HA) was sintered with the addition of 3 wt% aluminum isopropoxide(C9H21AlO3) powder and 3 wt % Teflon powder(-C2 F2-). Sample was prepared by following sol-gel technique. Obtained pellets of samples were sintered. For investigation of effects of temperature on microstructures and mechanical properties the samples were sintered at various temperatures. For studying the phase composition, microstructures and elemental analysis the sintered samples were characterized by X-rays diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive X-rays diffraction(EDAX) respectively. After sintering the samples mechanical properties, i e, grains size, apparent density, Vickers hardness, bending strength and compressive strength were found to be 2.14-18.76 μm, 1.523 6-0.752 g/cm3, 3.60-0.600 GPa and bending strength 33.265 8-14.900 MPa, 75-33 MPa, respectively. As a result of sintering fluoridated composite material was obtained.

关键词： fluoridated hydroxyapatite pressureless sintering mechanical properties hydroxyapatite materials

来源：评论

学校读者我要写书评

暂无评论

Gradient Structure of Ti-Al-C Ternary Carbide Prepared by Hot-pressing Sintering

引用

Journal of Wuhan University of technology(materials Science) 2005年第2期20卷 5-7页

作者：梅炳初 State key lab oratory of Advanced Technology for Material Synthesis and Processing Wuhan University of TechnologyWuhan 430070 China Prof

X-ray diffraction (XRD) analysis on different polished surfaces normal to the hot pressing direction reveals that the phase compositions of the polished surfaces from the outside to the inside are pure TiC, Ti_3AlC_2+TiC, pure Ti_3AlC_2 and Ti_2AlC+Ti_3AlC_2, no matter elemental powder or TiC is used as raw materials. It is found that ternary-layered carbide Ti_2AlC samples synthesized at 1500 ℃ by hot-pressing sintering are inhomogeneous and have a gradient *** probe X-ray micro-analysis (EPMA) indicates that the Al content along the hot pressing axis is parabolic, it is the highest in the center and the lowest at the both ends, while the Ti content is constant along the axis. The experimental result reveals that the evaporation of Al in samples in an open system during hot pressing sintering results in a gradient structure.

关键词： titanium aluminum carbide ceramic gradient structure evaporation

来源：评论

学校读者我要写书评

暂无评论

Graphite emulsion with excellent dispersion stability and rheological property for drawing ultrafine tungsten wire

引用

Journal of materials Research and technology 2025年 36卷 9473-9480页

作者： Du Zhao Jun Xie Ranran Hou Qinqin Wei Fuguo Lai Buwei Wang Jian Zhang Guoqiang Luo Qiang Shen State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 PR China Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou 521000 Guangdong PR China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 PR China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan 430070 PR China Hubei Longzhong Laboratory Xiangyang 441000 Hubei PR China Guangdong Xianglu Tungsten Industry Co. Ltd. Chaozhou 515633 PR China

The development of silicon wafers in the photovoltaic industry towards larger and thinner sizes requires ultrafine tungsten wires, and the uniform coating of high-performance graphite emulsion is the key to ensuring the quality of tungsten wires. However, existing graphite emulsion mainly depends on imports, and the limited domestic self-made graphite emulsion shows poor dispersion stability and nonuniform surface coating. This study provides a novel graphite emulsion with excellent dispersion stability and rheological property by introducing carboxymethyl cellulose (CMC). The graphite emulsion with 1.0 % CMC addition has the best dispersion stability, moderate viscosity, and excellent rheological properties. The steric hindrance effect produced by CMC polymer improves the dispersion stability, while the bridges and entanglements of CMC chains regulate the viscosity to ensure uniform coating. The resulted drawn tungsten wire exhibits a large free circle diameter and good surface quality. This work provides a theoretical basis for the preparation of high-performance emulsion and improving the quality of metal wire drawing.

关键词： Graphite emulsion CMC Dispersion stability Rheological property

来源：评论

学校读者我要写书评

暂无评论

Hierarchically porous materials:synthesis strategies and emerging applications

引用

Frontiers of Chemical Science and Engineering 2016年第3期10卷 301-347页

作者： Minghui Sun Chen Chen Lihua Chen Baolian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Laboratory of Inorganic Materials Chemistry

Great interests have arisen over the last decade in the development of hierarchically porous *** hierarchical structure enables materials to have maximum structural functions owing to enhanced accessibility and mass transport properties,leading to improved performances in various *** porous materials are in high demand for applications in catalysis,adsorption,separation,energy and *** the present review,recent advances in synthesis routes to hierarchically porous materials are reviewed together with their catalytic contributions.

关键词： hierarchically porous materials synthesis application

来源：评论

学校读者我要写书评

暂无评论

Thermal Shock Resistance and Erosion Resistance of TiB_2 Multiphase Ceramic Composites

引用

Journal of Wuhan University of technology(materials Science) 2006年第4期21卷 117-120页

作者：何平王为民 State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The thermal shock resistance and anti- aluminum erosion of TiB2 - BN multiphase ceramics composites were studied. The experimental results show that the TiB2-BN multiphase ceramic possesses a good thermal shock resistance at high temperatures （ 1000, 1200, 1400, 1500 ℃ ）, with the increasing in thermal shocking temperature, the electro-conductivity of TiB2-BN ceramics increases. The metal aluminum has a great influence on the properties of TiB2 - BN ceramics and the main reason is that the aluminum reacts seriously with BN. It is suggested that the content of BN should be reduced to the greatest extent.

关键词： thermal shocking resistance erosion resistance microstructure mechanism

来源：评论

学校读者我要写书评

暂无评论

Sintering and Phase Transformation of 7wt% Calcia-stabilized Zirconia Ceramics

引用

Journal of Wuhan University of technology(materials Science) 2009年第2期24卷 304-307页

作者：陈常连 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Calcia stabilized zirconia（CSZ） ceramics were prepared with 7wt% calcia-stabilized zirconia powder by pressureless sintering technology. The crystal phases of the sintered samples were studied by X-ray diffraction（XRD） and Raman spectroscopy techniques, and the microstructures of the fracture surfaces were observed by scanning electron spectroscopy（SEM）. The phase compositions and the lattice parameters of cubic calcia-stabilized zirconia were calculated by XRD patterns. As the sintering temperature increasing from 1400℃ to 1600℃, the monoclinic zirconia content decreases gradually, finally all monoclinic phase transforms to cubic calcia-stabilized zirconia, which is deter- mined to be Ca0.134Zr0.866O1.866. It is revealed that monoclinic zirconia is the main factor causing minute cracks on the surface of sintered samples, and the combination of the XRD patterns and Raman spectra is an effective way to research the phase transformations of zirconia.

关键词： calcia-stabilized zirconia sintering phase transformation relative density

来源：评论

学校读者我要写书评

暂无评论

Preparation and Characterization of Stainless Steel/TiC Nanocomposite Particles by Ball-milling Method

引用

Journal of Wuhan University of technology(materials Science) 2009年第1期24卷 38-41页

作者：陈文怡 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

A stainless steel/10wt%TiC nanocomposite particles were prepared by high-energy ball-milling method using stainless steel, carbon and titanium as raw materials. The evolution of phase composition, microstructure and specific surface area of the stainless steel/TiC nanocomposite particles with increasing ball-milling time in the range of 0-100 h were investigated by XRD, SEM, TEM and BET techniques. The results showed that the stainless steel/TiC nano-composite particles were fabricated when the ball-milling time was longer than 20 h. However, the nanocomposite particles were soldered and agglomerated again when the ball-milling time was longer than 60 h. The microstructure of the composite particles transformed from lamellar structure to nanostructure during the repeated process of the cold welding and cracking. TEM image reveals clearly that the in-situ TiC nanoparticles with grain size of 3-8 nm are in the interior of the stainless steel/TiC nanocomposite particles obtained by ball-milling 100 h.

关键词： stainless steel TiC nanoparticle high-energy ball mill nanocomposite

来源：评论

学校读者我要写书评

暂无评论

Structure and Photoluminescence of Mullite-Ge Nanocomposite

引用

Journal of Wuhan University of technology(materials Science) 2008年第6期23卷 787-790页

作者：高乐王皓 State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Al12Si3.75Ge0.25O26 ceramic powder was prepared by sol-gel method using Al（NO3）3,Si（OC2H5）4 and Cl3GeCH2-CH2COOH as *** structural formation of Al12Si3.75Ge0.25O26 ceramic powder was analyzed by *** reduction by flowing H2/Ar mixture gas,strong room temperature photoluminescence （PL） can be observed at 565 nm,613 nm,682 nm,731 nm and 777 nm,*** PL intensity scarcely depends on the reduction temperature and duration,while the sample reduced at 500 ℃ for A^3 hours has the highest PL *** and after reduction at 500 ℃,the volume of unit cell of mullite solid solution decreases to 0.4699 *** on the analysis of XPS and Raman spectra,it can be approved that the PL phenomenon at room temperature is caused by the embedded Ge nanoparticles with the average size of about 1.95 nm.

关键词： mullite solid solution sol-gel Ge nanoparticles photoluminescence

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：