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Flame-retardant Mechanism of Magnesium Oxychloride in Epoxy Resin

Journal of Wuhan University of technology(materials Science) 2009年第1期24卷 127-131页

作者：秦麟卿 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Center for Material Research and Analysis Wuhan University of Technology

Flame-retardant mechanism of magnesium oxychloride （M OC） in EP was in-vestigated by limiting oxygen index （LOI）, XRD, SEM, TG-DTG and DSC. The results show that MOC performed well as an inorganic flame-retardant in EP. When the content of MOC is 50%, the LOI of EP reaches 29.6% and mass of residual char reaches 9.6%. The flame retarde mechanism of MOC is due to the synergies of diluting, cooling, catalyzing char forming and obstructing effects.

关键词： magnesium oxychloride epoxy resin flame-retardant properties flame retardedmechanism

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Fabrication and Characterization of Nano Silver Powder Prepared by Spray Pyrolysis

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Journal of Wuhan University of technology(materials Science) 2009年第6期24卷 871-874页

作者：章桥新 School of Mechanical and Electronic Engineering Wuhan University of Technology State Key Laboratory of Advanced Technology for Materials Synthesis & Processing Wuhan University of Technology

Silver powder was fabricated by spray pyrolysis, using 2%-20% AgNO3 solution, 336-500 mL/h flux of AgNO3 solution, 0.28-0.32 MPa flux of carrier gas and in the 620-820 ℃ temperature range. The effects of furnace set temperature, concentration of AgNO3 aqueous solution, flux of AgNO3 aqueous solution as well as carrier gas on the morphology and particle size distribution of silver powder, were investigated. The experimental results showed that with the high concentration of AgNO3 aqueous solution, the average grain size of silver decreased with the increasing of furnace set temperature. But the gain size distribution was not homogenous, the discontinuous grain growth occurred. With the low concentration of AgNO3 aqueous solution, the higher furnace set temperature made the nano sliver grains sintered together to grow. Nano silver powder about 100 nm was fabricated by spray pyrolysis, using 2wt% AgNO3 solutions, 336 mL/h flux of AgNO3 aqueous solution, 0.32 MPa flux of carrier gas at 720 ℃ furnace set temperature.

关键词： nano silver powder fabrication characterization spray pyrolysis

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Preparation,Microstructure and Properties of NiO-Cr_2O_3-TiO_2 Infrared Radiation Coating

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Journal of materials Science & technology 2009年第5期25卷 695-698页

作者： Wu Chen Weiping Ye Xudong Cheng Wei Duan Fang Mao Deliang Li State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China College of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China

The spherical agglomerated particles were fabricated by spray drying with the powders of NiO, Cr2O3 and TiO2. Plasma spray power, which has good property of flowability, was acquired by heat treatment from the particles at 1200℃ in the reducing atmosphere. Dark and uniform coating of More than 50 μm thick was deposited on the copper sheet substrate by plasma spraying. It is found that the infrared normal total emissivity of the coating is up to 0.91 at 600℃ by infrared radiation testing. The X-ray diffraction analysis shows that the formation of （Cr0.88Ti0.12）2O3 and spinel structural NiCr2O4 in the coating is the main reason for high efficient infrared radiation, and the phase structure and performance of coating is favorable under the thermal cycle between room temperature and 600℃.

关键词： Spray drying Agglomerated particles Plasma spraying Normal total emissivity

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Electrochemical performances of electroactive nano-layered organic-inorganic perovskite containing trivalent iron ion and its use for a DNA biosensor preparation

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International journal of analytical chemistry 2010年第1期2010卷 419439页

作者： Jing Wu Hanxing Liu Zhidong Lin Minghe Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China.

A steady nano organic-inorganic perovskite hybrid with [H(2)3-AMP](3/2)Fe(CN)(6) (3-AMP = 3-methylaminopyridine) was prepared in the air. The structure is an unusual layered organic-inorganic type. The resulting hybrid enveloped in paraffin to prepare [H(2)3-AMP](3/2)Fe(CN)(6) paste electrode (HPE) shows good electrochemical activity and a couple of oxidation and reduction peaks with potential of cyclic voltammometry (CV) at around 440 mV and 30 mV. Compared with that on CPE, oxidation potential of Fe(CN)(6) (3-) on HPE shifts negatively 259.7 mV and that of reduction shifts positively 338.7 mV, which exhibits that [H(2)3-AMP](3/2)Fe(CN)(6) can accelerate the electron-transfer to improve the electrochemical reaction reversibility. Such characteristics of [H(2)3-AMP](3/2)Fe(CN)(6) have been employed to prepare the DNA biosensor. The single-strand DNA (ssDNA) and double-strand DNA (dsDNA) immobilized on HPE, respectively, can improve the square wave voltammometry (SWV) current and SWV potential shifts positively. The effect of pH was evaluated. And there is hybridization peak on SWV curve using HPE immobilized ssDNA in the complementary ssDNA solution. And HPE immobilized ssDNA can be utilized to monitor the DNA hybridization and detect complementary ssDNA, covering range from 3.24 x 10(-7) to 6.72 x 10(-5) g/mL with detection limit of 1.57 x 10(-7) g/mL. The DNA biosensor exhibits a good stability and reproducibility.

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Large Magnetostriction from Morphotropic Phase Boundary in Ferromagnets

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Physical Review Letters 2010年第19期104卷 197201-197201页

作者： Sen Yang Huixin Bao Chao Zhou Yu Wang Xiaobing Ren Yoshitaka Matsushita Yoshio Katsuya Masahiko Tanaka Keisuke Kobayashi Xiaoping Song Jianrong Gao Multi-disciplinary Materials Research Center Frontier Institute of Science and Technology State Key Laboratory for Mechanical Behavior of Materials and MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter Xi’an Jiaotong University Xi’an 710049 China Ferroic Physics Group National Institute for Materials Science Tsukuba 305-0047 Ibaraki Japan National Institute for Materials Science Beamline BL15XU Spring-8 1-1-1 Kohto Sayo-cho Hyogo 679-5148 Japan Key Lab of Electromagnetic Processing of Material Northeastern University 3-11 Wenhua Road Shenyang 110004 China

For more than half of a century, morphotropic phase boundary (MPB) in ferroelectric materials has drawn constant interest because it can significantly enhance the piezoelectric properties. However, MPB has been studied merely in ferroelectric systems, not in another large class of ferroic systems, the ferromagnets. In this Letter, we report the existence of an MPB in a ferromagnetic system TbCo2−DyCo2. Such a magnetic MPB involves a first-order magnetoelastic transition, at which both magnetization direction and crystal structure change simultaneously. The MPB composition demonstrates a 3–6 times larger “figure of merit” of magnetostrictive response compared with that of the off-MPB compositions. The finding of MPB in ferromagnets may help to discover novel high-performance magnetostrictive and even magnetoelectric materials.

关键词： Ferromagnetism

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Cyanobacteria immobilised in porous silica gels: Exploring biocompatible synthesis routes for the development of photobioreactors

Cyanobacteria immobilised in porous silica gels: Exploring b...

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作者： Léonard, Alexandre Rooke, Joanna C. Meunier, Christophe F. Sarmento, Hugo Descy, Jean-Pierre Su, Bao-Lian 61 rue de Bruxelles B-5000 Namur Belgium 61 rue de Bruxelles B-5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China Fonds National de la Recherche Scientifique 5 rue d'Egmont B-1000 Brussels Belgium Fonds National de la Recherche Scientifique B-1000 Brussels Belgium Institut de Ciències Del Mar-CMIMA CSIC Departament de Biologia Marina i Oceanografia Pg Maritim de la Barceloneta 37-49 E08003 Barcelona Catalunya Spain

With the aim of designing photobioreactors (PBR) based on a smart exploitation of microalgae for the production of biofuels and metabolites of interest, this paper describes a novel approach where cyanobacteria are entrapped within highly porous silica matrices. With this concept, it would be possible to work with a constant population of organisms for a continuous (and increased) photoproduction of metabolites, in contrast to "one-shot" uses of liquid cultures. Different hybrid materials based on porous silica gels are described with a special emphasis on finding the most appropriate immobilisation conditions for prolonged cell survival. It is found that an aqueous route based on acid-exchanged sodium silicate combined with the use of silica nanoparticles as a gel-strengthening species shows the best results with a high primary production rate post immobilisation and a preservation of the photosynthetic pigments of up to 35 weeks. Oxygen production, though very low, could be evidenced up to 17 weeks after entrapment, demonstrating the suitability of using porous silica matrices in PBR design. © 2010 The Royal Society of Chemistry.

关键词： Metabolites

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Carbothermal reduction and nitridation synthesis of γ-AlON powder under high heating rate

Carbothermal reduction and nitridation synthesis of γ-AlON ...

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1st International Symposium on advanced synthesis and processing technology for materials, ASPT08

作者： Peng, Ding Wang, Hao Wang, Weimin Wang, Yucheng Fu, Zhengyi State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan 430070 China

ISBN: (纸本)0878493298

In this paper, a carbothermal reduction and nitridation (CRN) synthesis for cubic aluminum oxynitride (γ-AlON) powders is reported. The CRN reaction was conducted via a two-step synthesis procedure at a heating rate of 100 °C/min. In the first step, the mixture of fine γ-Al2O3and soluble starch was annealed at 1550˜1580 °C for different duration. It is found that the mixture of α-Al2O3and AlN with an appropriate ratio can be obtained by CRN reaction. The content of AlN in mixture is closely related with the reaction condition. In the second step, the as-received mixture of α-Al2O3and AlN was heat-treated at 1700 °C for 10 min. The single phase γ-AlON powders with particle size less than 3 μm were obtained. © (2009) Trans Tech Publications, Switzerland.

关键词： Powders

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Phenomenon of “contact guidance” on the surface with nano-micro-groove-like pattern and cell physiological effects

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Chinese Science Bulletin 2009年第18期54卷 3200-3205页

作者： ZHOU Feng 1,2, YUAN Lin 1,3, HUANG He 1,2 & CHEN Hong1,2 1 state key lab.ratory of advanced technology for materials synthesis and processing, Wuhan 430070, China 2 School of materials Science and Engineering, Wuhan University of technology, Wuhan 430070, China 3 Biomedical materials Research Center, Wuhan University of technology, Wuhan 430070, China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan 430070 China School of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Biomedical Materials Research Center Wuhan University of Technology Wuhan 430070 China

The topography of material surface has important influence on cell behavior and physiological functions. Groove-like pattern has drawn much attention among various patterns, due to the phenomenon of "contact guidance" induced by this kind of topography. This review mainly focuses on "contact guidance" formation as well as its influence on cell behavior and physiological effects. The possible mechanisms of "contact guidance" formation were discussed. The research trend and the potential applications were also suggested.

关键词：细胞行为生理功能材料表面逻辑效应触指纳米微米生理效应

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Diffusion Kinetics of Carbonate Hydroxyapatite (CHAP) for Adsorbing F−Dissolved in Water

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Acta Geologica Sinica - English Edition 2010年第2期80卷

作者： HUANG Zhiliang ZHANG Lianmeng LIU Yu WANG Qilin HE Qianjun CHEN Wei State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei 430070 Research Institute of Mineral Material Wuhan Institute of Technology Wuhan Hubei 430073

Abstract A systematic research was performed about diffusion kinetics of adsorbing F − dissolved in water for carbonate hydroxyapatite (CHAP) from the natural hydroxyapatite which was modified by adulterating with CO 2 3 . The result shows that the speed of F − adsorption is controlled by membrane diffusion when F − concentration is relatively low, which is expressed by the kinetic equation of diffusion Q =0.0005( C 1 - C )( t - t 1 )+0.3967, or by vacancy diffusion when F − concentration is relatively high, which is expressed by the kinetic equation of diffusion In[ C (o, t )]=8.4718-0.5048ln t . Based on the feature of CHAP for adsorbing F − dissolved in water and its special channel of the structure of CO 2 3 - modified hydroxyapatite, models of vacancy diffusion and membrane diffusion were established.

关键词： carbonate hydroxyapatite (CHAP) F− ion diffusion kinetics

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Structural and electrochromic properties of molybdenum doped vanadium pentoxide thin films by sol-gel and hydrothermal synthesis

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Thin Solid Films 2009年第6期517卷 2023-2028页

作者： Jin, Aiping Chen, Wen Zhu, Quanyao Yang, Ying Volkov, V.L. Zakharova, G.S. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Institute of Materials Science and Engineering Wuhan University of Technology Wuhan 430070 China Institute of Solid-State Chemistry Ural Division Russian Academy of Science Pervomaiskaya 91 Yekaterinbur 620219 Russia

Molybdenum-doped vanadium pentoxide (Mo-doped V2O5) thin films with doping levels of 3-10 mol% were prepared by dip-coating technique from a stable Mo-doped V2O5 sol synthesized by sol-gel and hydrothermal reaction. The Mo-doped V2O5 films had a layered V2O5 matrix structure along c-axis orientation with Mo6+ as substitutes. Values of the inserted and extracted charge density of 21.4 and 21.3mCcm- 2 and the transmittance variation (ΔT at 640nm) between anodic (+ 1.0V) and cathodic (- 1.0V) colored states of 41% were observed for the films with 5 mol% Mo6+ doping. Above this dopant concentration, the charge capacity and ΔT decreased. The enhancement of the electrochemical and electrochromic properties of the films is related to changes in the electronic properties of V2O5 films due to the creation of energy levels in the band gap of V2O5 by the Mo doping, accompanied by the reduction of the forbidden-band width and the increase of the conductivity. © 2008 Elsevier B.V. All rights reserved.

关键词： Sol-gels

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