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Dynamic Mechanical and Thermal Properties of Cross-linked Polystyrene/Glass Fiber Composites

Journal of Wuhan University of technology(materials Science) 2010年第5期25卷 780-784页

作者：朱泉峣陈文 School of Materials Science and Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Cross-linked polystyrene/glass fiber composites were fabricated using cross-linked polystyrene （CLPS） as matrix and E-glass fiber as the reinforcement. Surfaces of E-glass fibers were modified by vinyl triethoxysilane （VTES）, vinyl trimethoxysilane （VTMS） and γ-methacryloylpropyl trimethoxysilane （MPS）. The treated glass fibers were analyzed by fourier transform infrared spectroscopy （FTIR）. Dynamic mechanical thermal analysis （DMTA） and thermo-gravimetric analysis （TGA） were employed to investigate the effect of glass fibers surface modification on viscoelastic behavior and thermal properties. The morphology of fracture surfaces of various composites was observed by scanning electron microscopy （SEM）. The results revealed that these coupling agents were connected to the surfaces of the fibers by chemical bonding. Dynamic mechanical properties as well as thermal stability of the composites were improved considerablely, but to varying degrees depending on the fiber modification. The diversities of improvement of properties were attributed to the different interfacial adhesion between CLPS matrix and the glass fibers.

关键词： polymer-matrix composite cross-linked polystyrene （CLPS） fiber/matrix bond dynamic mechanical thermal analysis.

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Fine-structured TiO2 ceramic patterns on the ceramic surface fabricated by replication

Fine-structured TiO2 ceramic patterns on the ceramic surface...

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

作者： Kim, H.D. Nakayama, T. Hong, B.J. Imaki, K. Yoshimura, T. Suzuki, T. Suematsu, H. Lee, S.W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology 1603-1 Kamitomioka Nagaoka 940-2188 Japan Department of Physics and Electronics Graduate School of Engineering Osaka Prefecture University 1-1 Gakuencho Nakaku Sakai 599-8531 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The ability to fabricate high precision micro- to nanoscale structure in a wide variety of materials is of crucial importance for the advancement of microtechnology, nanotechnology and nanoscience. Also, the ability to create micrometer and sub-micrometer architecture for functional ceramics is a prerequisite of exploring the rich field of ceramic nanotechnology. In this work we fabricated three-dimensional oxide ceramic materials with fine-structure over multiple length scales by combining replication patterning technique, polyvinyl alcohol (PVA), oxide ceramic material (TiO2) nano-sized particles. Our study is based on the idea that PVA can be easily detached from a mold by peeling. We confirmed that micron and sub-micron-sized fine-structured oxide ceramic patterns containing nano-sized pores could be fabricated using this procedure. The results presented demonstrate the compositional and structural diversities that are possible with a facile approach and simple method.

关键词： Ceramic materials

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Design of leaf-like materials capable of energy conversion and CO2 assimilation

Design of leaf-like materials capable of energy conversion a...

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International Conference on Clean Energy Science 2011年国际清洁能源科学会议(ICCES2011)

作者： Christophe F.Meunier Pierre Van Cutsem Baolian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology430070 WuhanChina Laboratory of Inorganic Materials Chemistry University of NamurB-5000 NamurBelgium Unit of Research in Plant Cellular and Molecular BiologyUniversity of NamurB-5000 NamurBelgium Laboratory of Inorganic Materials ChemistryUniversity of NamurB-5000 NamurBelgium

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Phase field simulation of precipitation in a Mg-Al alloy using two techniques of approximation

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IOP Conference Series: materials Science and Engineering 2012年第1期33卷

作者： G M Han Z Q Han A A Luo A K Sachdev B C Liu Key Laboratory for Advanced Materials Processing Technology (Ministry of Education) Department of Mechanical Engineering Tsinghua University Beijing 100084 China Correspondent: Z Q Han Ph.D Associate professor Department of Mechanical Engineering Tsinghua University Haidian District Beijing 100084 China Chemical Sciences and Materials Systems Laboratory General Motors Global Research and Development Center Warren MI 48090-9055 USA State Key Laboratory of Automotive Safety and Energy Department of Automotive Engineering Tsinghua University Beijing 100084 China

In this paper, the precipitation of β-Mg17Al12 in aging process of Mg-9%Al (mass fraction) alloy was studied using a diffuse-interface phase field model. In the model, the precipitate phase and the matrix are distinguished by a structural order parameter, and the interface region is assumed to be a mixture of the precipitate phase and the matrix. The mixture composition was calculated using a weighted average method. Two techniques of approximation for the chemical free energy of precipitate phase and matrix were employed, where the variation characteristics of the free energy with the mole fraction of solute were included. In the simulation, the temperature and diffusion mobility coefficient were assumed to be constant. The effects of the solution approximations on the morphology evolution and growth kinetics of the precipitate were discussed. The effects of the interface mobility coefficient on the interface growth kinetics were examined, and the effects of the interface anisotropy between the precipitate phase and the matrix on the morphology of the precipitate were also discussed. It is demonstrated that the solution approximation taking into account the interaction between atoms for a binary system provides a good description for the chemical free energy. The simulation results showed that the precipitate phase growing from a supersaturated solid solution has a plate-like shape, which is in agreement with experimental observations. The growth kinetics of the precipitate phase is significantly influenced by the interface mobility coefficient.

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Silver Hollow Microspheres: Large-scale synthesis, Characterization and Electromagnetic Shielding Property

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Chinese Journal of Structural Chemistry 2010年第4期29卷 555-564页

作者：王一龙章桥新邵寒梅官建国 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Chemistry School of Sciences Wuhan University of Technology

A facile and large-scale synthesis method to fabricate silver hollow microspheres with controllable morphologies and shell thickness is described using low-cost glass microspheres as templates. The method mainly involves two steps of the preparation of silver-coated glass microsphere core–shell particles by a controllable liquid reduced reaction of Ag[（NH3）2]＋ solution, which only produces silver nanoparticles anchored on the surface of the thiolated glass microsphere templates, and the removal of glass microspheres by wet chemical etching with HF solution. The products are well characterized by field emitted scanning electron microscopy （SEM）, transmitted electron microscopy （TEM）, X-ray photoelectron spectra （XPS）, X-ray diffraction （XRD） and energy dispersive X-ray （EDX） etc. The as-prepared core-shell particles and hollow particles have even and compact silver shells. The electromagnetic shielding coatings based on the silver hollow microspheres are demonstrated to have high conductivity, excellent shielding effectiveness and long durability, suggesting that the silver hollow microspheres obtained here are a novel light-weight electromagnetic shielding filler and will have extensive applications in the electromagnetic compatibility fields.

关键词： electroless plating core-shell particles silver hollow microsphere electromagnetic shielding

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Rapid growth of ZnO hexagonal tubes by direct microwave heating

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International Journal of Minerals,Metallurgy and materials 2010年第1期17卷 80-85页

作者： Zhen-qi Zhu Jian Zhou School of Materials Science and Technology Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Zinc oxide hexagonal tubular crystals were synthesized by direct microwave heating from ZnO powders within 5 min without any metal catalysts or transport agents. ZnO source materials were evaporated from the high-temperature zone in an enclosure, and crystals were grown on the self-source substrate in an appropriate condition. The ZnO vapor formed in the high-temperature zone can deposit and grow on the powders located in the low-temperature zone to form crystals. The scanning electron microscopy （SEM） reveals that these products are hexagonal tube crystals with 80 ~rn in diameter and 250 μm in length, having a well faceted end and side surface. A possible growth mechanism and the influence of reaction temperature on the formation of crystalline ZnO hexagonal tubes were presented. The photoluminescence （PL） exhibits strong ultraviolet emission at room temperature, indicating the potential applications in short-wave light-emitting photonic devices.

关键词： ZnO crystal microwave heating vapor growth photoluminescence （PL）

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Structural Optimization of Two-stage Thermoelectric Generator for Wide Temperature Range Application

Structural Optimization of Two-stage Thermoelectric Generato...

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International Conference on Electric Information and Control Engineering

作者： Tianqi Yang Jinsheng Xiao Wenyu Zhao Qingjie Zhang School of Automotive Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

ISBN: (纸本)9781424480364

A 3-D finite element model of two-stage thermoelectric generator based on low-temperature thermoelectric material bismuth-telluride and medium-temperature thermoelectric material skutterudites is established. Based on the formal model, structural optimization of the two-stage thermoelectric generator is carried out. Results show that, reasonable design of the structure of two-stage thermoelectric generator can take full advantage of the characteristics of thermoelectric materials and effectively improve the performance of power generation. If contact resistance and all heat losses are neglected, the conversion efficiency of the two-stage thermoelectric generator can reach a value of 17.02%.

关键词： Design optimization Thermoelectric generator Thermoelectric unicouple Conversion efficiency Finite element

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Polyaniline nanoparticles for supercapacitor prepared by using polystyrene microsphere as carrier

Polyaniline nanoparticles for supercapacitor prepared by usi...

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2011 International Conference on Remote Sensing, Environment and Transportation Engineering, RSETE 2011

作者： Tan, Yong-Tao Ran, Fen Wang, Ling-Ren Kong, Ling-Bin Kang, Long State Key Laboratory of Gansu Advanced Non-Ferrous Metal Materials Lanzhou University of Technology Lanzhou 730050 China Key Laboratory of Non-ferrous Metal Alloys and Processing Ministry of Education Lanzhou University of Technology Lanzhou 730050 China

ISBN: (纸本)9781424491711

Polyaniline nanopaticles for supercapacitor were prepared by using polystyrene microsphere as carrier. They were characterized by FTIR, SEM and TGA for structure and electrochemical station for supercapacitive performance. The results show that, the polystyrene-polyaniline composite, about 4∼5 μm, keep the microsphere structure of polystyrene, and was covered on its surface with polyaniline nanoparticle of about 50 nm. The composite shows excellent supercapacitive performance. Increasing the fraction of PANI/PS-PANI (w) result in an increase of capacitance of PS-PANI composite, and a maximum specific capacitance was 275 F/g, and capacitance of polyaniline first increased, then decreased. When w was 0.44, capacitance was a maximum capacitance of 498 F/g. © 2011 IEEE.

关键词： Nanoparticles

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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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International Conference on Mechanic Automation and Control Engineering (MACE)

作者： Jiankang Huang Jiawei Fan Yu Shi Lihui Lu Ling Shao Ding Fan Key Laboratory 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)9781424494361

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.

关键词： Welding Wires Process control Aluminum alloys Control systems Real time systems Stability analysis

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Monitoring of pulsed MIG welding process of aluminum alloy based on the LabVIEW real-time vision

Monitoring of pulsed MIG welding process of aluminum alloy b...

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Chinese Control Conference (CCC)

作者： Jiankang Huang Lihui Lu Ling Shao Yu Shi Ding Fan Key Laboratory of Non-ferrous Metal Alloys and Processing under the management for Ministry of Education Lanzhou University of Technology 730050 China State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials Lanzhou University of Technology 730050 China

A real-time synchronous acquisition and control system was designed to meet the requirements of measurement and control for pulsed MIG welding process of aluminum alloy using virtual instrument design software LabVIEW. Considering the characteristics of pulsed MIG welding, development efficiency and control response time, the mode of "data acquisition card+ PC+ real-time controller" was adopted and the parallel processing of voltage, current and vision signals was realized with complex signal processing algorithm based on hardware platform and COM technology. The test results show that the developed platform can acquire and process the information real-timely and effectively in pulsed MIG welding process of aluminum alloy and also has friendly program interface and good expansibility.

关键词： Welding Data acquisition Real time systems Aluminum alloys MATLAB Process control

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