检索结果-内蒙古大学图书馆

Metastable amorphous chromium-vanadium oxide nanoparticles with superior performance as a new lithium battery cathode

引用

Nano Research 2014年第11期7卷 1604-1612页

作者： Jinzhi Sheng Qidong Li Qiulong Wei Pengfei Zhang Qinqin Wang Fan Lv Qinyou An Wei Chen Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key LaboratoryWuhan University of Technology Wuhan 430070 China

The main drawbacks of vanadium oxide as a cathode material are its low conductivity, low practical capacity and poor cycling stability. Adding Cr can improve its conductivity and a metastable amorphous state may provide higher capacity and stability. In this work, metastable amorphous Cr-V-O nano- particles have been successfully prepared through a facile co-precipitation reaction followed by annealing treatment. As a cathode material for lithium batteries, the metastable amorphous Cr-V-O nanoparticles exhibit high capacity （260 mAh/g at 100 mA/g between 1.5-4 V）, low capacity loss （more than 80% was retained after 200 cycles at 100 mA/g） and high rate capability （up to 3 A/g）.

关键词： Cr2V4O13 nanoparticles metastable amorphous structure lithium battery

来源：评论

学校读者我要写书评

暂无评论

Promotion of peripheral nerve regeneration and prevention of neuroma formation by PRGD/PDLLA/b-TCP conduit:report of two cases

引用

Regenerative Biomaterials 2015年第2期2卷 119-124页

作者： Yixia Yin Binbin Li Qiongjiao Yan Honglian Dai Xinyu Wang Jifeng Huang Shipu Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Department of Orthopedic Surgery Wuhan General Hospital of Guangzhou Military CommandWuhan430070China

In the field of nerve repair,one major challenge is the formation of ***,reports on both the promotion of nerve regeneration and prevention of traumatic neuroma in the clinical settings are rare in the field of nerve *** of the reasons could be the insufficiency in the follow-up *** have conducted 33 cases of nerve repair using PRGD/PDLLA/b-TCP conduit without any sign of adverse reaction,especially no neuroma *** them,we have selected two cases as representatives to report in this *** first case was a patient with an upper limb nerve wound was bridged by PRGD/PDLLA/b-TCP conduit and a plate fixation was *** nearly 3-years’follow-up,the examination results demonstrated that nerve regeneration effect was very *** the reoperation was performed to remove the steel plate we observed a uniform structure of the regenerated nerve without the formation of neuroma,and to our delight,the implanted conduit was completely degraded 23 months after the *** second case had an obsolete nerve injury with neuroma *** removal of the neuroma,the nerve was bridged by PRGD/PDLLA/b-TCP ***-up examinations showed that the structure and functional recovery were improved gradually in the 10-month follow-up;no end-enlargement and any other abnormal reaction associated with the characteristic of neuroma were *** on our 33-case studies,we have concluded that PRGD/PDLLA/b-TCP nerve conduit could both promote nerve regeneration and prevent neuroma formation;therefore,it is a good alternative for peripheral nerve repair.

关键词： clinical case peripheral nerve regeneration neuroma formation PRGD/PDLLA/b-TCP conduit

来源：评论

学校读者我要写书评

暂无评论

Highly efficient synthesis of ordered nitrogen-doped mesoporous carbons with tunable properties and its application in high performance supercapacitors

引用

Journal of Power Sources 2016年 321卷 143-154页

作者： Dan Liu Chao Zeng Deyu Qu Haolin Tang Yu Li Bao-Lian Su Deyang Qu Department of Chemistry School of Chemistry Chemical Engineering and Life Sciences Wuhan University of Technology 122 Luoshi Road Wuhan 430070 People’s Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 People’s Republic of China Laboratory of Inorganic Materials Chemistry University of Namur 61 Rue de Bruxelles B-5000 Namur Belgium Clare Hall University of Cambridge Herschel Road Cambridge CB3 9AL United Kingdom Department of Mechanical Engineering College of Engineering and Applied Science University of Wisconsin Milwaukee 3200 N. Cramer Street Milwaukee WI 53211 USA

Nitrogen-doped ordered mesoporous carbons (OMCs) have been synthesized via aqueous cooperative assembly route in the presence of basic amino acids as either polymerization catalysts or nitrogen dopants. This method allows the large-scale production of nitrogen-doped OMCs with tunable composition, structure and morphology while maintaining highly ordered mesostructures. For instances, the nitrogen content can be varied from ∼1 wt% to ∼6.3 wt% and the mesophase can be either 3-D body-centered cubic or 2-D hexagonal. The specific surface area for typical OMCs is around 600 m 2 g −1 , and further KOH activation can significantly enhance the surface area to 1866 m 2 g −1 without destroying the ordered mesostructures. Benefiting from hierarchically ordered porous structure, nitrogen-doping effect and large-scale production availability, the synthesized OMCs show a great potential towards supercapacitor application. When measured in a symmetrical two-electrode configuration with an areal mass loading of ∼3 mg cm −2 , the activated OMC exhibits high capacitance (186 F g −1 at 0.25 A g −1 ) and good rate capability (75% capacity retention at 20 A g −1 ) in ionic liquid electrolyte. Even as the mass loading is up to ∼12 mg cm −2 , the OMC electrode still yields a specific capacitance of 126 F g −1 at 20 A g −1 .

关键词： N-doped carbon Mesoporous Supercapacitor Tunable properties

来源：评论

学校读者我要写书评

暂无评论

Surface Passivation of Nanocrystalline Silicon Powder Derived from Cryomilling

引用

Journal of Wuhan University of technology(materials Science) 2014年第1期29卷 65-69页

作者：王志浩 HUANG Zhifeng 陈斐 SHEN Qiang ZHANG Lianmeng State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Key Laboratory of Advanced Technology for Specially Functional Materials Ministry of Education Wuhan University of Technology

The surface passivation mechanism of nanocrystalline silicon powder was studied. The liquid nitrogen/argon was used as the medium to prepare the nanocrystalline silicon powder, using a cryomilling technology. The X-ray diffraction, transmission electron microscopy, plasma emission spectroscopy and infrared spectrum were used to analyze the prepared samples, and density functional theory was used to investigate the cryomilling process. For nanocrystalline silicon powder cryomilled with liquid N2, the amorphous outer layer with N element is formed On the surface, and chemisorption caused by the formation of Si-N-Si bond leads to the surface passivation; although physisorpfion also he confirmed, the Si-N bond is steady after exploded in air for 30 days and no new bond is observed. For nanocrystalline silicon powder cryomilled with liquid At, no new chemical bond is Observed, Ar element absorbs on the surface of the prepared powder only through physisorption, and after exploded in air for 30 days, a Si-O bond can be observed obviously.

关键词： surface passivation nanocrystalline silicon powder cryomilling

来源：评论

学校读者我要写书评

暂无评论

Mechanism of Fixation of Ozone and Its Medical Value

引用

Journal of Wuhan University of technology(materials Science) 2014年第6期29卷 1183-1186页

作者：朱磊 MIN Xinmin WANG Xuchao Chemistry Department School of Sciences Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Because of both ozone gas and ozone solution are instable which limits the application of ozone, to solve the storage problem, it is necessary to find a kind ofideal ozone carrier which can combine ozone as an ＂ozonic compound＂ in which the bond strength between ozone and carrier should not be too high or too low, to appropriately release ozone from the ozonic compound. Combining Criegee’s three-step reaction mechanism of ozone and olefins, the charge, covalent bond levels and energy levels of ozone, ethylene, butadiene and their ozonic compounds were calculated by the first-principles calculation method based on density functional theory methods. The stability of the ozonide, or the bond strength between ozone and ions of carrier were controlled felicitously to release ozone from the ozonide with proper velocity. Ozone antimicrobial was composed on the above principle. It can be used conveniently, especially for common families.

关键词： ozone fixation carrier release velocity antimicrobial

来源：评论

学校读者我要写书评

暂无评论

Effect of Coated PHB on Properties of Abradable Seal Coating

引用

Journal of Wuhan University of technology(materials Science) 2014年第3期29卷 417-421页

作者：程旭东 XIANG Hongyu YE Weiping MENG Xiaoming MIN Jie LIU Minzhi ZHANG Pu LU Wei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology College of Materials Science and Engineering Wuhan University of Technology

As pore-forming materials, the coated polyop-hydroxybenzoate（short for PHB） and h-BN can be applied in the preparation of abradable seal coatings at high temperature. The characteristics of coating such as morphology, thermal stability and composition were studied by SEM, EDS and FTIR. The results show that the modified PHB will change the remained carbon amount, porosity and pore morphology of the coating, which can affect the properties of coatings. If the pore is small enough in uniform distribution, the coating with 5 MPa bond strength, 30-55 HR45Y superficial hardness and certain of carbon can be suitable to well abradability.

关键词： coated-PHB pore morphology seal coating

来源：评论

学校读者我要写书评

暂无评论

New approach for chiral separation: from polysaccharide-based materials to chirality-responsive polymers

引用

Science China Chemistry 2014年第11期57卷 1492-1506页

作者： DING Peng CHANG BaiSong QING GuangYan SUN TaoLei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology

Chiral separation that is closely related to daily life is a meaningful research. Polysaccharide-(e.g., cellulose, amylose derivatives) based chiral packing materials afford powerful chiral stationary phases(CSPs) toward a broad range of racemic compounds. However, considering the explosive growth of specific chiral drugs, the separation efficiencies of these CSPs need further improvement, which calls for new approaches and strategies. Smart polymers can change their physical or chemical properties dynamically and reversibly according to the external stimuli(e.g., thermo-, pH, solvent, ion, light, critical parameters for chromatographic separation) exerted on them, subsequently resulting in tunable changes in the macroscopic properties of materials. In addition to their excellent controllability, the introduction of chiral characteristics into the backbones or side-chains of smart polymers provides a promising route to realize reversibly conformational transition in response to the chiral analytes. This dramatic transition may significantly improve the performance of materials in chiral separation through modulating the enantioselective interactions between materials and analytes. With the help of chirality-responsive polymers, intelligent and switchable CSPs could be developed and applied in column-liquid chromatography. In these systems, the elution order or enantioselectivity of chiral drugs can be precisely modulated, which will help to solve many challenging problems that involve complicated enantiomers. In this paper we introduce some typical examples of smart polymers that serve as the basis for a discussion of emerging developments of CPSs, and then briefly outline the recent CSPs based on natural and certain synthetic polymers.

关键词： chiral separation chiral stationary phases（CSPs） enantioseparation HPLC smart polymer

来源：评论

学校读者我要写书评

暂无评论

Chemical equilibrium controlled synthesis of polyoxymethylene dimethyl ethers over sulfated titania

引用

Journal of Energy Chemistry 2015年第2期24卷 239-244页

作者： Huaju Li Huanling Song Feng Zhao Liwei Chen Chungu Xia Laboratory for Nano-Catalytic Material & Technology Division of Advanced Nano?materials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences i-Lab Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences

The chemical equilibrium and reaction kinetic behavior in the synthesis of polyoxymethylene dimethyl ethers （DMMn） were investigated over sulfated titania in order to reveal the decisive factor controlling the reaction. The results showed that the molar ratio of adjacent DMMn products in equilibrium solution had the same value, which depended absolutely on the reaction temperature. Meanwhile, the reactions had the same DMMn products distributions under varied reaction conditions. The equilibrium constants of the related step-wise reactions for DMMn formation were equal, which were calculated based on the bulk compositions of the reaction solution. And thus, the selectivity to DMMn was mainly controlled by the chemical equilibrium, i.e., thermodynamic control. In brief, the present results provide some guidance for future synthesis of DMMn.

关键词： polyoxymethylene dimethyl ethers sulfated titania chemical equilibrium reaction kinetic molar ratio

来源：评论

学校读者我要写书评

暂无评论

Effects of Al Addition on the Microstructure and Properties of Nb/Nb_5Si_3 in situ Composites Fabricated via Spark Plasma Sintering

引用

Journal of Wuhan University of technology(materials Science) 2014年第5期29卷 1036-1038页

作者：龙文元 YAO Junping FU Zhengyi College of Aeronautical Manufacuring Engineering Nanchang Hangkong University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Dense Nb/Nb5Si3 composites were fabricated via spark plasma sintering technology using Nb, Si, and Al elemental powders as raw materials. The microstructttres of the synthesised composites were analyzed through scanning electron microscopy, X-ray diffraction, and electron probe microanalysis. The results show that the composites consisted of residual Nb particle phase and Nb5Si3 phase. The microstructure of the Nb/ Nb5Si3 in situ composites was evidently affected by Al addition, which prompted the formation of the Al3Nb10Si3 phase. In addition, the Rockwell hardness of the composites decreased with the increase in AI additions. The Rockwell hardness of Nb-20Si is 60HRC, which decreased to approximately 52.7 HRC when the Al content increased to 15 at%. The oxidation resistance of the Nb/NbsSi3 in situ composites significantly improved with the increase in Al addition.

关键词： spark plasma sintering Nb/Nb5Si3 composites oxidation resistance microstructure

来源：评论

学校读者我要写书评

暂无评论

In-situ synthesis and sintering of mullite glass composites by SPS

引用

Journal of advanced Ceramics 2014年第2期3卷 165-170页

作者： Jinyong ZHANG Hai ZHAN Zhengyi FU Richard TODD State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Department of Materials University of OxfordOxfordUK

The main subject of this work is an investigation of the effects of heating rate and current on the crystallisation of amorphous precursors in spark plasma sintering(SPS).For this,dry gel of Al_(2)O_(3)-SiO_(2) with a molar ratio of 1:1,was synthesized and sintered in-situ by SPS,and also by hot pressing(HP)for *** analysis showed that the only crystalline product in both cases was mullite,whose Al_(2)O_(3) content was lower in the SPS *** microstructures showed a low volume fraction of large mullite fibers in the SPS specimens,whereas a high volume fraction of fine equiaxed grains was present in the HP *** main difference in microstructure between HP and SPS specimens could be explained in terms of the higher heating rate of the SPS *** size of the SPS die also affected the size and aspect ratio of the mullite fibers produced,which might have been due to either the different electrical current required or a difference in specimen temperature profile.

关键词： spark plasma sintering(SPS) synthesis extra-field mullite

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：