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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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Photocatalytic Degradation of Rhodamine B Dye with MWCNT/TiO_2/C_(60) Composites by a Hydrothermal Method

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Journal of Wuhan University of technology(materials Science) 2011年第1期26卷 65-69页

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

Multi-walled carbon nanotube （MWCNT）/TiO2/C60 composite catalysts were prepared by hydrothermal method. TiO2 was deposited on the MWCNT surface. Their photocatalytic activities for degradation of Rhodamine B dye were studied. X-ray diffraction, field emission transmission electron microscopy, ultraviolet-visible light absorption spectrum and photoluminescence spectrum were carried out to characterize the composite catalysts. The results indicated that MWCNTs and C60 could greatly enhance the photocatalytic activity of TiO2.

关键词： semiconductors chemical synthesis optical properties surface properties

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synthesis and characterization of LiNi_(0.95-x)Co_xAl_(0.05)O_2 for lithium-ion batteries

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Rare Metals 2006年第4期25卷 303-308页

作者： ZHU Xianjun ZHAN Hui LIU Hanxing ZHOU Yunhong State Key Laboratory of Advanced Technology and Processing for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China College of Chemical and Molecular Science Wuhan University Wuhan 430072 China

Samples of LiNi0.95-xCoxAl0.05O2 （x = 0.10 and 0.15） and LiNiO2, synthesized by the solid-state reaction at 725℃ for 24 h from LiOH-H2O, Ni2O3, Co2O3, and AI（OH）3 under an oxygen stream, were characterized by TG-DTA, XRD, SEM, and electrochemical tests. Simultaneous doping of cobalt and aluminum at the Ni-site in LiNiO2 was tried to improve the cathode performance for lithium-ion batteries. The results showed that co-doping （especially, 5 at.% A1 and 10 at.% Co） definitely had a large beneficial effect in increasing the capacity （186.2 mA.h/g of the first discharge capacity for LiNio.s.42OoaoAlo.0502） and cycling behavior （180.1 mA-h/g after 10 cycles for ***2） compared with 180.7 mA.h/g of the first discharge capacity and 157.7 mA.h/g of the tenth discharge capacity for LiNiO2, respectively. Differen- tial capacity versus voltage curves showed that the co-doped LiNio.95_***2 had less intensity of the phase transitions than the pristine LiNiO2.

关键词： electrochemistry LiNi0.95-xCoxAl0.05O2 lithium-ion batteries co-doping cathode materials LiNiO2

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An efficient bifunctional electrocatalyst derived from layer-by-layer self-assembly of a three-dimensional porous Co-N-C@graphene

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Science Bulletin 2019年第14期64卷 968-975页

作者： Shichang Cai Rui Wang William M. Yourey Junsheng Li Haining Zhang Haolin Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China College of Engineering Penn State University Hazleton PA 18202 USA

Three-dimensional (3D) porous carbon-based materials with tunable composition and microstructure are of great interest for the development of oxygen involved electrocatalytic reactions. Here, we report the synthesis of 3D porous carbon-based electrocatalyst by self-assembling Co-metal organic frameworks (MOF) building blocks on graphene via a layer-by-layer technique. Precise control of the structure and morphology is achieved by varying the MOF layer to tune the electrocatalytic properties. The as-produced electrocatalyst exhibits an excellent catalytic activity for the oxygen reduction reaction in 0.1molL^-1 KOH, showing a high onset potential of 0.963V vs. reversible hydrogen electrode (RHE) and a low tafel slope of 54mVdec^-1, compared to Pt/C (0.934V and 52mVdec^-1, respectively). Additionally, it shows a slightly lower potential vs. RHE (1.72V) than RuO2 (1.75V) at 10mAcm^-2 in an alkaline electrolyte. A rechargeable Zn-air battery based on the as-produced 3D porous catalyst demonstrates a high peak power density of 119mWcm^-2 at a cell voltage of 0.578V while retaining an excellent stability over 250 charge-discharge cycles.

关键词： Oxygen reduction reaction Cobalt Three-dimensional Oxygen evolution reaction Graphene

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Engineering Thermoelectric Performance of α-GeTe by Ferroelectric Distortion

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Energy & Environmental materials 2024年第2期7卷 171-179页

作者： Yuting Fan Chenghao Xie Jun Li Xiangyu Meng Jinchang Sun Jinsong Wu Xinfeng Tang Gangjian Tan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The rhombohedralα-GeTe can be approximated as a slightly distorted rock-salt structure along its[111]direction and possesses superb thermoelectric ***,the role of such a ferroelectric-like structural distortion on its transport properties remains ***,we performed a systematic study on the crystal structure and electronic band structure evolutions of Ge_(1-x)Sn_(x)Te alloys where the degree of ferroelectric distortion is continuously *** is revealed that the band gap is maximized while multiple valence bands are converged at x=0.6,where the ferroelectric distortion is the least but still *** undistorted,the band gap is considerably reduced,and the valence bands are largely separated ***,near the ferro-to-paraelectric phase transition Curie temperature,the lattice thermal conductivity reaches its minima because of significant lattice softening enabled by ferroelectric *** predict a peak ZT value of 2.6 at 673 K inα-GeTe by use of proper dopants which are powerful in suppressing the excess hole concentrations but meanwhile exert little influence on the ferroelectric distortion.

关键词： electronic band structures ferroelectric distortion lattice softening thermoelectric α-GeTe

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Polydopamine-assisted in-situ formation of dense MOF layer on polyolefin separator for synergistic enhancement of lithium-sulfur battery

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Nano Research 2022年第9期15卷 8048-8055页

作者： Xiuxiu Wu Cheng Zhou Chenxu Dong Chunli Shen Binbin Shuai Cheng Li Yan Li Qinyou An Xu Xu Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

The separator is of great significance to alleviate the shuttle effect and dendrite growth of lithium-sulfur ***,most of the current commercial separators cannot meet these requirements *** this work,a dense metal-organic-framework(MOF)modification layer is in-situ prepared by the assistant of polydopamine on the polypropylene *** to the unique structure and synergistic effect of polydopamine(PDA)and zeolitic imidazolate framework-8(ZIF-8),the functional separator can not only trap the polysulfides effectively but also promote the transport of lithium *** a result,the battery assembled with the functional separator exhibits excellent cycle *** capacity remains 711 mAh·g^(−1)after 500 cycles at 2 C,and the capacity decay rate is as low as 0.013%per *** symmetrical battery is cycled for 1,000 h at 2 mA·cm^(−2)(2 mAh·cm^(−2))with the plating/stripping overpotential of 20 *** the same time,the modification separator shows a higher lithium ion transference number(0.88),better thermal stability and electrolyte wettability than the unmodified separator.

关键词： metal-organic frameworks in-situ growth polysulfides shuttle effect gradient distribution

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Energy-dispersive X-ray Spectroscopy for the Quantitative Analysis of Pyrite Thin Specimens

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Journal of Wuhan University of technology(materials Science) 2023年第6期38卷 1304-1310页

作者： LUO Tingting GUO Yi DENG Zhao LIU Xiaoqing SUN Zhenya QI Yanyuan YANG Meijun Center for Materials Research and Analysis Testing Wuhan University of Technology Wuhan 430070China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070Wuhan

To explore ways to improve the accuracy of quantitative analysis of samples in the micrometer to nanometer range of magnitudes,we adopted analytical transmission electron microscopy(AEM/EDS)for qualitative and quantitative analysis of pyrite ***,the k factor of pyrite is calculated *** develop an appropriate non-standard quantitative analysis model for pyrite materials,the experimentally calculated k factor is compared with that estimated from the non-standard quantitative analytical model of the instrument *** experimental findings demonstrate that the EDS attached to a TEM can be employed for precise quantitative analysis of micro-and nanoscale regions of pyrite ***,it serves as a reference for improving the results of the EDS quantitative analysis of other sulfides.

关键词： analytical transmission electron microscopy(AEM) energy dispersive X-ray spectroscopy(EDS) pyrite thin specimen quantitative analysis

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Revisiting Water Oxidation Reaction with Micro Bubble Lithography (MBL) Printed ZIF-67 MOF Electrocatalysts

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Small Methods 2025年 e2401627页

作者： Manna, Khokan Ranjan, Anand Dev Singh, Himanshi Sen, Rakesh Verpoort, Francis Banerjee, Abhik Banerjee, Ayan Roy, Soumyajit EFAML Materials Science Center Department of Chemical Sciences Indian Institute of Science Education and Research Kolkata741246 India Light Matter Lab Department of Physical Sciences Indian Institute of Science Education and Research Kolkata Mohanpur741246 India TCG Centres for Research and Education in Science and Technology Sector V Salt Lake Kolkata700091 India State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China 6 Miklukho-Maklaya Str. Moscow117198 Russia National Research Tomsk Polytechnic University Lenin Avenue 30 Tomsk634050 Russia

Microbubble-based micro-lithographic techniques have developed rapidly over the last ten years and are capable of reproducibly patterning a wide variety of soft materials and colloids, including polymers, metals, and proteins. Zeolitic imidazolate framework (ZIF) materials have attracted a great deal of research and application interest in the field of materials science because of their chemical and thermal stabilities. Furthermore, ZIF-67 has demonstrated significant potential for applications in gas adsorption, molecule separation, electrochemistry, and catalysis, which when converted into "lab-on-a-chip" platforms might produce remarkable and diverse application-oriented outcomes. This is due to their highly adjustable nanostructures. Using Co(OAc)2.4H2O and Co(NO3)2.6H2O as the metal ion sources and 2-methylimidazole as the ligand, To design ZIF-67 (composed of Co2+ ions and imidazolate ligands) is attempted. Inspired by previous results, the Micro-Bubble Lithography (MBL) approach is used to successfully demonstrate an instantaneous in situ green synthesis and micro-patterning of ZIF-67 MOFs in this work. With reasonable stability and an over-potential of 440 mV, these micro-patterns are used as microelectrodes for the electrocatalytic oxygen evolution reaction (OER) in media having different pH. © 2025 Wiley-VCH GmbH.

关键词： Green synthesis

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Characterization and properties of new dielectric ceramics Ba_5LnZnNb_9O_(30)(Ln=La, Nd and Sm)

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中国有色金属学会会刊：英文版 2006年第B02期16卷 534-537页

作者：朱文凤胡长征吴伯麟方亮 Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of Education Guilin University of TechnologyGuilin 541004China Key Laboratory of Nonferrous Materials and New Processing TechnologyMinistry of Education Guilin University of Technology Guilin 541004China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Three novel dielectric ceramics Ba5LnZnNb9O30 (Ln= La, Nd and Sm) were synthesized and characterized in the BaO-Ln2O3-ZnO-Nb2O5 quaternary system, which formed the filled tungsten-bronze structures. The present ceramics exhibit high dielectric constant (εr) up to 310, low dielectric loss in the level of 10 3 at 1 MHz. Meanwhile, the temperature coefficients of the dielectric constant (τε) of Ba5LnZnNb9O3o varies from -1 390×10-6 to -1 220×10-6/℃as the radius of Ln3+ increases. The present ceramics are promising candidates for high dielectric constant and low loss dielectric ceramics.

关键词：介电陶瓷 Ba5LnZnNb9O30 Ba5NdZnNb9O30 Ba5SmZnNb9O30 合成介电性质表征

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synthesis of NiCr_2O_4 spinel coatings with high emissivity by plasma spraying

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International Journal of Minerals,Metallurgy and materials 2012年第3期19卷 266-270页

作者： Zhen-qi Zhu Xu-dong Cheng Wei-ping Ye Jie Min 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

Air plasma spraying （APS） was used to produce high emissivity coatings with a NiCr204 spinel structure. The relationship between the emissivity and the crystal structure was investigated. X-ray diffraction （XRD） analyses show that NiCr204 spinel has been fabri- cated with the space group Fd3m. Scanning electron microscope （SEM） photographs show that the coating consists of a laminated structure with homogeneous grains and high porosity because of the unique feature of plasma spraying. The emissivity measurement and Fourier transformation infrared radiation （FT-IR） spectra show that NiCr204 has a high emissivity of about 0.91 because of its special spinel structure APS is a suitable method to produce high emissivity coatings.

关键词： infrared radiation coatings plasma spraying emissivity crystal structure industrial ftLrnaces

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