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synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic nanocomposites

Synthesis and Self-Assembly of Core-shell Co@SiO2 Magnetic n...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Si-Ming Wu Nan Jiang Wei Geng Ru-Jin Cheng Jie Hu Jie Ying Sheng-Chun He Yong Wang Xiao-Yu Yang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

In recent years, self-assembly nanoparticles into well-ordered structures possess quite important position in spectroscopy, magnetism, catalysis and biology. Among all of the nanoparticles, magnetic nanoparticles promises an unparalleled opportunity for self-assembly as they can be controlled to form directional arrangements according to the external magnetic fields. Herein we choose Cobalt nanoparticles whose diameter is within 10 nm. In this size they can show fabulous superparamagnetism, which means each nanoparticle is a small domain, when without an external field, the particles are disordered and show paramagnetic. However, when an external field is applied, to which the nanoparticles are controlled to arrange, and at this time they show ferromagnetic. What can’t be ignored is that it is difficult to achieve self-assembly process in smaller size of the nanoparticles due to easy aggregation. Taking this into consideration, core-shell nanostructures provide an effective vehicle to protect magnetic core and enhance their chemical stability. In this work, ordered self- assembly Co@SiO 2 nanocomposites are firstly reported by changing the external magnetic field. Cobalt nanoparticles as the magnetic cores were easily controlled to form varies arrangements, which means they can self- assembly into multi-scale regular patterned structures. Owing to strong external magnetic field, the ordered structured crystalline Co@SiO 2 composite with directional arrangements are successfully achieved by self-assembly. Moreover, by changing the magnetic field, the composite also forms 2D arrays and 3D structures. This nanocomposite can be applied as controlled targeted drug carriers which shows great potential in biological diagnosis and biomedical treatment. It is believed that this methodology of self-assembly can be extended to other similar core-shell nanocomposites with magnetic core and paves way to further applications in magnetism and biomedical researches.

关键词： self-assembly, nanoparticles, core-shell, magnetic.

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WC-Co tool failure mechanism in titanium alloys machining

WC-Co tool failure mechanism in titanium alloys machining

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作者： Xiuxu, Zhao Zude, Zhou Gangqin, Shao School of Mechanical and Electrical Engineering Wuhan University of Technology Wuhan Hubei 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan Hubei 430070 China

The 5-axis milling processes were conducted with several uncoated WC-Co tools, which are with taper ball end mills with four flutes. There is a severe problem of high rate of tool failure, which has led to the high cost and low productivity of the milling process. In order to find out the real reason, some former work, which included the tool geometry analysis, tool path and tool posture analysis, as well as the cutting force calculating, had been done. It has been found that most of the tool failures are resulted from cutting edge chipping or the workpiece material of titanium alloys attached to the tool, Meanwhile, a suddenly applied load or an abrupt unloading of the tool at the end of a cut is another important factor. Moreover, the tool materials had been analyzed, which included the element composition analysis with XRD, the microstructure analysis with SEM. XRD results indicate the cobalt at the tip of tool is less than at the shank of tool. SEM results indicate there are micro-cracks concentrated in the cutting edge area. The tool material failure mechanism will be set up based on the tool material analysis in this study.

关键词： Titanium alloys

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Modeling of the droplet morphology evolution in polymer blends under shear by the pseudo-potential lattice boltzmann method 72

Modeling of the droplet morphology evolution in polymer blen...

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72nd Annual Technical Conference of the Society of Plastics Engineers: The Plastics Conference, ANTEC 2014

作者： Deng, Lin Huang, Zhigao Zhang, Yun Cui, Shubiao Zhou, Huamin Li, Dequn State Key Lab. of Material Processing and Die and Mould Technology Huazhong University of Science and Technology Wuhan China DGHUST Manufacturing Engineering Institute Dongguan China

ISBN: (纸本)9781634397087

In this work, a novel modeling strategy is proposed to simulate the morphology evolution of polymer blends by the inter-particle-potential lattice Boltzmann method. In this model, the binary components of the polymer blends are tracked by two sets of density distribution functions governed by lattice Boltzmann equation. The model is verified by computing the droplet behavior of deformation, breakup and coalescence under shear, and the results are found in good agreement with the theoretical and experimental observations. Copyright © (2014) by the Society of Plastics Engineers.

关键词： Distribution functions

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Multimodal Zeolite Catalysts with Hierarchically Micro-Meso-Macroporous Structure

Multimodal Zeolite Catalysts with Hierarchically Micro-Meso-...

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中国化学会第九届全国无机化学学术会议

作者： Li-Hua Chen Ming-Hui Sun Bao-Lian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Crystalline microporous zeolites are one of the most useful catalysts in industrial processes such as oil refining and organic synthesis owing to their strong catalytic performance, high thermal and hydrothermal stabilities, and well-defined micropores with excellent shape-selectivity in catalysis. However, one disadvantage of these zeolitic catalysts is that their pores are too small to be accessed by bulky reactants, thus hindering their use in the fine chemical and petroleum processing industries. To overcome such drawbacks, we have synthesized hierarchically ordered micro-meso-macroporous solid-acid catalysts via a chemically crystallization process in an improved hydrothermal system. Zeolites, including Silicalite-1, ZSM-5, Beta and TS-1, with hierarchically ordered micro-meso-macroporous structure have been synthesized. It is expected that these hierarchical zeolite materials will exhibit superior catalytic performance owing to the improved mass-transfer properties.

关键词： zeolites hierarchical porous catalyst ordered macro-meso-micro

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synthesis and application of hierarchically porous materials induced by functional proteins in ion screening

Synthesis and application of hierarchically porous materials...

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International Conference on Nanoscience & technology,China 2013(ChinaNANO 2013)

作者： Yong Wang Wei Geng Ru-Jin Cheng Nan Jiang Jie Hu Jie Ying Sheng-Chun He Si-Ming Wu Xiao-Yu Yang State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

Biomineralization is a widespread phenomenon in nature leading to the formation of a variety of solid inorganic structures by living organisms. And many chemists have long strived to mimic this nature’s critical tricks. Many studies have been focused on this field. These biomineralized materials are inorganic-organic hybrid composites formed by self-assembled processes under mild conditions, showing interesting properties, controlled hierarchical structures, and special function. Among the biomineralization, proteins are attractive for synthesis of the hybrid materials, due to its much milder reaction conditions, highly specific or multiple functions and many successful examples existing in nature. Here we chose a functional protein, C96 RIDC-1 4 , which has the ability to selectively bind metal irons, such as Zn 2+ . Because of its high surface area, high stability and the property of capillary effect, the hierarchically structured porous materials are one of the ideal materials for biomineralization. In the typical synthesis process of the macro-meso porous materials, the functional protein was used as the second kind of the templates to induce the formation of the hierarchically structured porous materials, besides the surfactant is a template. For the living of the protein, we change the reaction condition to be much milder, such as at or near neutral pH, choosing the special surfactant which is not harmful to the protein, and so on. We prepared the macro-meso porous materials into the monolithic column. And this monolithic column is porous structure with macropores and two sizes of the mesopores. With the obtained monolithic devices, we tested its adsorption amount of Zn 2+ to get the limit value, the efficiency of the adsorption using the Zn 2+ solution with very low concentration and different filter time. Those results show the potential application in purifying the water to obtain the pure water with less impurity ions, purifying the organic compound and dr

关键词： biomineralization, protein, macro-meso porous materials, monolithic column

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Study on mullite whiskers preparation via non-hydrolytic sol-gel process combined with molten salt method

Study on mullite whiskers preparation via non-hydrolytic sol...

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Chinese materials Congress on Functional and Functionally Structured materials, CMC 2015

作者： Fu, Kai Lin Jiang, Wei Hui Liu, Jian Min Feng, Guo Pan, Mu School of Material Science and Engineering Jingdezhen Ceramic Institute Jingdezhen333001 China Jiangxi Key Laboratory of Advanced Ceramic Materials Jingdezhen333001 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783038357605

Mullite whiskers were prepared via non-hydrolytic sol-gel process combined with molybdate molten salt using tetraethoxysilane and anhydrous aluminum chloride as precussor, anhydrous ether as oxygen donor, molybdate as molten salt. The effects of heat treatment temperature, molten salt amount, holding time on synthesis and morphology of mullite whiskers were investigated by X-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The results show that the mullite whiskers appeared at the lowest temperature of 800℃, and optimized mullite whiskers could be prepared at 900℃ for 8 h with the mass ratio of xerogel and molybdate as 1:2, the diameter of the whiskers was in the range of 0.15-0.22 μm with the aspect ratio of more than 40. © 2016 Trans Tech Publications, Switzerland.

关键词： Aluminum chloride

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Enhanced and suppressed effects of ionic liquid on the photocatalytic activity of TiO2

Enhanced and suppressed effects of ionic liquid on the photo...

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作者： Qi, Lifang Yu, Jiaguo Jaroniec, Mietek State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122# Wuhan 430070 China Department of Chemistry and Biochemistry Kent State University Kent OH 44242 United States

The effects of a room temperature ionic liquid, 1-butyl-3-methylimidazolium terafluoroborate ([Bmim]BF4), on the photocatalytic performance of Degussa P25 TiO2 were investigated. Also, the photocatalysis mechanism was systematically analyzed by conducting different reactive radical trapping experiments. The results showed that photogenerated electrons were the main reactive species involved in the photocatalytic degradation of methyl orange (MO), while •OH radicals and photogenerated holes played an important role in the photocatalytic decomposition of rhodamine B (RhB). The addition of ionic liquid (IL) could slightly enhance the photocatalytic degradation rate of MO because adsorption of [Bmim]+ ions on the TiO2 surface not only enhanced traping and transfer of photogenerated electrons, but also facilitated adsorption of negatively charged MO. On the contrary, IL suppressed the degradation rate of RhB because [Bmim]+ on the TiO2 surface not only hindered the access of positively charged RhB to TiO2, but also restricted the diffusion of positively charged holes to the TiO2/solution interface. © 2013 Springer Science+Business Media New York.

关键词： Titanium dioxide

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Time on the performance of ceramic ball grinding media prepared from refractory waste

Time on the performance of ceramic ball grinding media prepa...

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作者： Zhong, L.Y. Wu, B.L. Zhang, L.M. Song, J.G. State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Key Lab. of Nonferrous Materials and New Processing Technology Guilin University of Technology Ministry of Education Guilin Guangxi 541004 China Department of Materials and Chemical Engineering Guilin University of Technology Guilin 541004 China

Aluminosilicate refractory waste was used to prepare high performance ceramic ball grinding media with 75% Al2O3. The influence of milling time on the particle size of raw materials, the sintering temperature, and performance of ceramic balls were studied. Results show that with increasing milling time the particle size of the raw materials decreased, resulting in a decrease of ceramic ball sintering temperature and an increase in wear resistance and volume density. The wear rate and volume density of balls prepared by milling the materials for 72 h were 0.01886 %/h and 3.374 g/cm 3, respectively.

关键词： Grinding (machining)

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Preparation and properties of mullite - Based iron multi - Functional nanocomposites

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6th Pacific Rim Conference on Ceramic and Glass technology

作者： Wang, Hao Wang, Weimin Fu, Zhengyi Sekino, Tohru Niihara, Koichi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan Hubei Province 430070 China Institute of Scientific and Industrial Research Osaka University Mihogaoka 8-1 Ibaraki Osaka 567-0047 Japan State Key Lab of Advanced Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 Hubei Province China

ISBN: (纸本)0470080337

Mullite-based nanocomposite powders with embedded iron nanoparticles were synthesized by reduction of sol-gel prepared Al5.4Fe 0.6Si2O13 solid solution in hydrogen. Structural characterization studied by TEM revealed that the intra-granular iron nanoparticles along with inter-type iron grains were obtained in mullite matrix. The magnetic properties of nanocomposite powders after reduction at 1200°C were measured by SQUID. It suggests that the intergranular and intragranular α-iron nanoparticles had the ferromagnetic and superparamagnetic behavior at room temperature, respectively. Dense Mullite-based iron composites were prepared from the nanocomposite powders reduced at different temperatures by hot pressing. The mechanical and magnetic properties were strongly affected by the reduction temperature. Flexural strength of mullite based iron nanocomposite reduced at 1200°C and successively hot pressed at 1650°C is one times higher than monothetic mullite. Furthermore, dense composites also behave ferromagnetic property at room temperature.

关键词： Nanostructured materials

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The mechanism of controlling pore microstructure for YAG porous ceramics 6th

The mechanism of controlling pore microstructure for YAG por...

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6th Annual Meeting on Testing and Evaluation of advanced materials, TEIM 2015

作者： Xu, Minghan Song, Jieguang Du, Daming Wang, Fang Li, Yangliang Ji, Gangchang Chen, Fei Engineering and Technology Research Center for Materials Surface Remanufacturing of Jiangxi Provence Department of Materials Engineering Jiujiang University Jiujiang332005 China State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783038357278

YAG is an important advanced structural and functional material. The mechanism of controlling pore microstructure of YAG porous ceramics were investigated in this paper. Through the porosity and SEM result analyzing, the conclusions are shown as follows, the porosity and the pore size of YAG porous ceramics are decreased with increasing the sintering temperature, the pores of YAG porous ceramics show a regular and well-distributed structure as lower sintering temperature, the porosity of YAG porous ceramics is increased with increasing the foaming agent content, but the increasing tendency is few after adding content more 15wt%, when the foaming agent content is less than 15wt%, the big pore is more and the pore microstructure is better. So the sintering temperature at 1500°C for 1 hour and the foaming agent content for 15wt% are better controlling conditions for obtaining better porosity and pore microstructure. © 2016 Trans Tech Publications, Switzerland.

关键词： Yttrium aluminum garnet

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