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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Zhang, K.B. Fu, Z.Y. Zhang, J.Y. Wang, W.M. Lee, S.W. Niihara, K. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Materials Engineering SunMoon University Asan ChungNam 336-708 Korea Republic of Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Nagaoka Niigata 940-2188 Japan

Novel CoCrFeNiTiAlx(x:molar ratio, other elements are equimolar) high-entropy alloys were prepared by vacuum arc melting and these alloys were subsequently annealed at 1000°C for 2 h. The annealing effects on structure and mechanical properties were investigated. Compared with the as-cast alloys, there are many complex intermetallic phases precipitated from the solid solution matrix in the as-annealed alloys with Al content lower than Al1.0. Only simple BCC solid solution structure appears in the as-annealed Al 1.5 and Al2.0 alloys. This kind of alloys exhibit high resistance to anneal softening. Most as-annealed alloys possess even higher Visker hardness than the as-cast ones. The as-annealed Al0.5 alloys shows the highest compressive strength while the Al0 alloy exhibits the best ductility, which is about 2.6 GPa and 13%, respectively. The CoCrFeNiTiAlx high-entropy alloys possess integrated high temperature mechanical property as well.

关键词： Vacuum applications

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synthesis of superparamagnetic FePt nanoparticles and their anticancer activities on brain tumor cells

Synthesis of superparamagnetic FePt nanoparticles and their ...

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第十三届全国生物材料学术会议

作者： Haiming Sun Ting Zhang Dan Chen Yixia Yin Qingzhi Wu Shipu Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and Biomedical Materials and Engineering Center Wuhan University of Technology Wuhan 430070China

Superparamagnetic FePt nanoparticles (NPs) have attracted considerable attention due to their extremely promising potentials as the diagnostic and therapeutic reagent in biomedical *** the present study, we developed a facile route to synthesize water-soluble FePtNPsabout 4 nm in diameter and oil-soluble FePtNPs about 6 nm in diameter using amino acids and oleic acid/oleylamine as the capping reagent, *** component, size and magnetic property of FePt NPs were tuned through adjusting the reactant molar ***, the anticancer activities of FePt NPs were evaluated using different brain tumor cell lines (such as U251, U87, H4) as the *** growth prohibition of tumor cells by NPs was measured through MTT assay, while the interaction of NPs and tumor cells was observed through transmission electron microscopy (TEM).The results show that FePt NPs synthesize by oleic acid/oleylamine shows better cytotoxicity toward brain tumor cells than L-cysteine-synthesized FePt *** cellular uptake, intracellular trafficking, and uptake pathways of FePt NRs in three cells were *** conclusion,we developed a facile synthesis of water-soluble superparamagnetic FePt NPs with the different component and the different anticancer activity of FePt NPs on Human brain tumor cells were *** results provide a promising potential of superparamagnetic FePt NPs as the multifunctional diagnostic and therapeutic reagent in biomedical fields.

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The preparation of oriented TiO2 nanotube films by electrophoretic deposition method without hard template and enhanced photocatalytic activity

The preparation of oriented TiO2 nanotube films by electroph...

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9th Chinese International Nanoscience and technology Symposium and the Nano-Products Exposition

作者： Zhao, Li Shen, Yi Wang, Shimin State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan 430070 China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei University Wuhan 430062 China Faculty of Material Science and Chemical Engineering China University of Geosciences Wuhan 430074 China

Highly oriented titanate nanotube (TNT) film was successfully synthesized by a simple electrophoretic deposition (EPD) method without any hard templates and surfactants. This oriented films adequately utilized the excellent properties of ID nanomaterials such as single crystal semiconductor architectures, large surface area, and superior charge transport, which lead to higher photocatalytic activity. We believe that this versatile method can be extent to fabricate other ordered ID nanomaterials films. Copyright © Taylor & Francis Group, LLC.

关键词： Yarn

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Fabrication of translucent boron nitride dispersed polycrystalline silicon nitride ceramics

Fabrication of translucent boron nitride dispersed polycryst...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Joshi, B. Fu, Z. Niihara, K. Lee, S.W. Department of Metallurgy and Material Engineering Sunmoon University Korea Republic of State Key Lab. of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology China Nagaoka University of Technology Nagaoka Japan Department of Environment Engineering Sunmoon University Asan Korea Republic of

Optical transparency was achieved at infrared region and overall translucent silicon nitride was fabricated using hot press sintering (HPS). The increase in h-BN content decreased the optical transparency. Microstructral observations shows that the optical, mechanical and tribological properties of BN dispersed polycrystalline Si3N4 ceramics were affected by the density, α:β-phase ratio and content of h-BN in sintered ceramics. The hot pressed samples were prepared from the mixture of α-Si3N4, AlN, MgO and h-BN at 1850°C. The composite contained from 0.25 to 2 mass % BN powder with sintering aids (9% AlN + 3% MgO). Maximum transmittance of 57% was achieved for 0.25 mass % BN doped Si3N4 ceramics. Fracture toughness was increased and wear volume and friction coefficient were decreased with increase in BN content.

关键词： III-V semiconductors

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Effect of CuO on Microstructure and Microwave Dielectric Properties of CaTiO3-Ca(Zn1/3Nb2/3)O3 Ceramics System

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MRS Online Proceedings Library (OPL) 2011年第1期966卷 0966-T10-06-0966-T10-06页

作者： Hongtao Yu Hua Hao Hanxing Liu Zhongqing Tian yuhongtao2001@*** Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Luoshi Road 122# Wuhan 430070 China People's Republic of 86-27-87864681 86-27-87651779 haohuayang@*** Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China People's Republic of lhxhp@*** Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China People's Republic of tzqmail@*** Chongqing Institute of Technology Chongqing 400050 China People's Republic of

The effect of CuO on the microstructure and microwave dielectric properties of the CaTiO3-Ca(Zn1/3Nb2/3)O3 ceramics prepared by the conventional solid-method has been investigated. Doped with the 0.5∼1.25wt% CuO powder, the system of which the sintering temperatures were lowered exhibited the orthorhombic perovskite. It can effectively promote the microwave dielectric properties of the 0.3CaTiO3-0.7Ca(Zn1/3Nb2/3)O3 system at lower sintering temperature at the level of 1.0wt% CuO additive. The quality factor increases from 10860 to 13900GHz and not any significant change was observed in the TCF value with fixed CuO additive at different sintering temperature.

关键词： ceramic dielectric properties morphology

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Microstructures of Nanotubes Reinforced Alumina Fabricated by Two Fast-Sintering Methods

Microstructures of Nanotubes Reinforced Alumina Fabricated b...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Huang, L.W. Fu, Y. Wang, H. Lee, S.W. Niihara, K. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan

Spark plasma sintering (SPS) and Self-propagating High-temperature synthesis/ quick pressing (SHS/QP) methods were used to fabricate nanotubes reinforced alumina. The difference in microstructure was discussed. In the SHS/QP process, the maximum densification temperature is 1660°C and the heating rate is about 1600°C /min. The whole densification process in SHS/QP is very short, which is much beneficial to protect the nanotubes and restrain the growing of grains. The fracture toughness of the sample prepared by SHS/QP is up to 4.9MPam1/2 for 1mass% CNTs/Al2O3 composites, which shows excellent toughening effects of nanotubes.

关键词： Microstructure

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Wire extension with dual freedom PID control in pulsed MIG welding process of aluminum alloy

Wire extension with dual freedom PID control in pulsed MIG w...

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2011 2nd International Conference on Mechanic Automation and Control Engineering, MACE 2011

作者： Huang, Jiankang Fan, Jiawei Shi, Yu Lu, Lihui Shao, Ling Fan, Ding Key Lab. of Non-ferrous Metal Alloys and Processing under the Management for Ministry of Education Lanzhou University of Technology Lanzhou China State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology Lanzhou China

ISBN: (纸本)9781424494392

Research work of wire extension control with Dual freedom PID controller in pulsed MIG welding process of aluminum alloy. In the condition of optimum parameters, the simulations were firstly completed by separately using Routine PID control and Dual freedom PID control, based on designing the wire speed of wire extension step response and gaining identification model. Based on the results of simulation using Matlab/Simulink, the experimental research on aluminum alloy pulsed MIG welding by using Dual freedom PID control was carried out in the real-time target environment with XPC Target. In the pulsed MIG welding process of aluminum alloy, the results prove that the Dual freedom PID control can bring higher precision and quicker response speed, efficiently control the stability of wire extension, and satisfy the stability of welding process. © 2011 IEEE.

关键词： Three term control systems

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synthesis of superparamagnetic FePt nanoparticles and their anticancer activities on brain tumor cells

Synthesis of superparamagnetic FePt nanoparticles and their ...

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第十一届全国生物无机化学学术会议

作者： Haiming Sun Ting Zhang Mingyan Dong Dan Chen Yixia Yin Qingzhi Wu Shipu Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing and BiomedicalMaterials and Engineering Center Wuhan University of Technology Wuhan 430070 China

Superparamagnetic FePt nanoparticles (NPs) have attracted considerable attention due to their extremely promising potentials as the diagnostic and therapeutic reagent in biomedical *** the present study,water-soluble FePt NPs about 4 nm in diameter and oil-soluble FePt NPs about 6 nm in diameter were successfully synthesized using amino acids and oleic acid/oleylamine as the capping reagent,*** component,size and magnetic property of FePt NPs were tuned through adjusting the reactant molar ***,the anticancer activities of FePt NPs with different capping reagents were evaluated using different brain tumor cell lines (such as U251,U87,H4) as the *** growth prohibition of tumor cells by NPs was measured through MTT assay,while the interaction of NPs and tumor cells was observed through transmission electron microscopy (TEM).The results show that FePt NPs capped with oleic acid/oleylamine displayed better cytotoxic effects toward brain tumor cells than L-cysteine-capped FePt *** is interesting that the cellular uptake of FePt NPs seem to be similar in three cell *** conclusions,we synthesized successfully superparamagnetic FePt NPs with the different component using different capping reagents,which displayed different anticancer activities on Human brain tumor *** results also provide a promising potential of superparamagnetic FePt NPs as the multifunctional diagnostic and therapeutic reagent in biomedical fields.

关键词： FePt superparamagnetic anticancer activities brain tumor cells

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Prepartion of semi-solid AM60 alloy by novel Self-Inoculation Method

Prepartion of semi-solid AM60 alloy by novel Self-Inoculatio...

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2nd International Conference on Manufacturing Science and Engineering, ICMSE 2011

作者： Li, Yuan Dong Xing, Bo Ma, Ying Chen, Ti Jun Hao, Yuan State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology No.287 Lan Gong Ping Road Lanzhou 730050 China Key Lab. of Non-ferrous Metal Alloys and Processing Ministry of Education Lanzhou University of Technology Lanzhou 730050 China

ISBN: (纸本)9783037850312

A research focus on semi-solid metal processing is the preparation of semi-solid slurry with non-dendritic microstructure. During the past several decades, people tended to obtain the non-dendritic structure by stirring melt of alloy which downs to the semi-solid temperature range, such as mechanical stirring and electromagnetic stirring;In recent years, with the technological innovation of semi-solid slurry preparation turned to be more convenient and efficient, most of these processes are based on the control of nucleation and growth process of primary phase during solidification, such as NRC, SSR, SLC, SEED, and CRP. In this paper, a novel process, named as "Self-Inoculation Method (SIM)", has been proposed for semi-solid slurry preparation. The process involves self-inoculants addition to the melt, and then pouring the melt to mould through a multi-stream mixed cooling channel. The melt was avoided chemical pollution due to the particles of self-inoculants from the same composition as the melt. The semi-solid billets of AM60 alloy with non-dendritic structure were prepared by SIM. The effects of process parameters on the microstructure and the mechanism on refinement of alloy were investigated. The results indicate that pouring temperature, addition amount of self-inoculants and slope angle of the cooling channel are key factors for SIM process. The optimized parameters for the billet preparation of AM60 alloy are obtained: pouring temperature is at 680°C∼700°C;addition of self-inoculants are between 5%∼7% (mass fraction);slope angle of the cooling channel is at 30°∼45°. The heterogeneous nucleation was enhanced as the addition of self-inoculants;the formation of chill crystal and the fragmentation of dendrites because of cooling and shearing of the cooling channel, resulting in the increase of grains density and a small grain size. © (2011) Trans Tech Publications.

关键词： Grain refinement

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Facile synthesis of Uniform Hollow Hematite Sub-micro Spheres with Controllable Shell Thickness

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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 controllable 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

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