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

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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Li3N film modified separator with homogenization effect of lithium ions for stable lithium metal battery

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Progress in Natural Science:materials International 2021年第6期31卷 845-851页

作者： Zhongyun Yan Cheng Zhou Cheng Li Yan Li Chunli Shen Kaijian Yan Xu Xu International School of Materials Science and Engineering State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

Lithium metal anode with high theoretical capacity is considered to be one of the most potential anode materials of the next generation. However, the growth of lithium dendrite seriously affects the application of lithium metal anode and the development of lithium metal batteries（LMBs）. Herein, an ultrathin Li3N film modified separator to homogenize the lithium ions and protect the lithium metal anode was reported. Due to the intrinsic properties of Li3N, the functional separator possessed good thermal stability, mechanical properties and electrolyte wettability, and the homogenization of the lithium ion was realized without increasing the interface impedance. With this functional separator, the Li/Li symmetrical cell could achieve a long cycle with low overpotential for 1000 h at a current density of 1 m A cm-2. Furthermore, when the full battery was assembled with Li FePO4and the discharge capacity could be maintained at 151 m Ah g-1after 400 cycles at 1 C. In addition, the full battery also showed good rate performance, and provided a high discharge capacity of 114 m Ah g-1at 5 C.

关键词： Functional separator Solid electrolyte interface Physical vapor deposition Li metal anode

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synthesis of Cr_2AlC from Elemental Powders with Modified Pressureless Spark Plasma Sintering

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Journal of Wuhan University of technology(materials Science) 2019年第2期34卷 287-292页

作者：葛梦妮 WANG Xiaofan LI Gaiye LU Chen 张建峰 TU Rong College of Mechanics and Materials Hohai University State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

We introduced a modified pressureless sintering strategy by SPS with a new T-shape die and tapered punches, which helps the evaporation of melted Al and reduces the sample sticking with the inner wall of the die. Thus, the die breaking risk in the sintering process or the de-molding process is avoided at all. At a low temperature and short holding time, a high purity of Cr_2 AlC was obtained in this SPS process from the optimization of different molar ratios of raw materials. Simultaneously, the high porosity of the as-obtained sample was also a distinguishing feature worth noticing. The reaction mechanism for this process was also discussed in detail. This study presented a new venue for future development of high purity "MAX" materials and others related materials by a modified pressureless sintering strategy.

关键词： pressureless spark plasma sintering Cr2AlC reaction mechanism

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Influence of an Optimized Fibre Coating on Interfacial and Mechanical Properties of Glass Fibre/Polypropylene Composites

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Journal of Wuhan University of technology(materials Science) 2002年第1期17卷 62-65页

作者：余剑英 State Key Laboratory for Advanced Technology of Materials Synthesis and Processing Wuhan University of Technology Wuhan China

The influence of pretreatment of fibre on interfacial and mechanical properties of glass fibre/ polypropylene composites was investigated. Firstly, the glass fibres were coated with the blends of m-IPP (maleic anhydride grafting isotatic polypropylene ) and m-APP ( maleic anhydride grafting amorphous polypropylene) in different, ratios. Secondly, the interfaced reaction of the coated composites was analysed by FTIR, which shows that the interfacial chemical reaction between m-IPP/m-APP in the fibre coating and the fibre surface- bound coupling agent is in existence. Thirdly, the microstructure of the coated composites wax studied by SEM. The results indicate that the coating treatment is effective on improving interfacial adhesion of the, fibre-matrix and the right amount of m-APP added to the coal impels the plastic deformation surrounding the point of cracks , which makes cracks turn to region and prevents from further interface debonding. Lastly, the mechanical properties were evaluated by measurement, of the flexural strength and impact strength of the composites. It was found that, the flexural strength and impact strength of the composites with coating fibre are higher than those of uncoating fibre composite. The results of these investigations draw the conclusion that the pretreatment of fibre with m-IPP/m-APP blends can form an optimize interlayer between the fibre and the PP matrix, which improves both the strength and lough-ness of the composites.

关键词： glass fibre surface treatment interfare thermoplastic composites

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Progress of advanced electrocatalysts towards electrochemical selectivity reduction CO2 to formic acid

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Applied Catalysis A: General 2025年 701卷

作者： Long, Xiaofeng Peng, Yujie Yu, Ze Zhang, Yuhong Jiang, Xueliang Yang, Huan Hubei Key Laboratory of Plasma Chemistry and Advanced Materials School of Materials Science and Engineering Key Laboratory of Green Chemical Engineering Process of Ministry of Education Wuhan Institute of Technology No. 206 Guanggu 1st Road Wuhan430205 China Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules College of Chemistry and Chemical Engineering Hubei University Wuhan430062 China Hubei Key Laboratory of Processing and Application of Catalytic Materials Huanggang Normal University China

Electrocatalytic reaction can convert carbon dioxide (CO2) into formic acid (HCOOH), which is considered as a promising pathway for sustainable energy conversion and valuable chemicals production. Nevertheless, CO2 reduction reaction (CO2RR) to HCOOH exists high reaction potential, insufficient active site and low product selectivity. In this review, various catalysts, including metal and metal oxides, metal-organic frameworks, covalent organic frameworks and carbon-based materials, are summarized from the structure-activity relationship between electrocatalysts and CO2RR performance. Then, the regulation strategies of morphology control, defect engineering, and interface engineering, to improve the selectivity and stability of CO2RR have been successively analyzed. In addition, the practical application of CO2RR to HCOOH in electrochemical energy technologies (formic acid fuel cells and water splitting) are comprehensively discussed. Finally, the perspectives and outlook of advanced catalysts for electrochemical selectivity reduction CO2 to HCOOH are thoroughly addressed. This review will be helpful to provide new insights for designing high selective and stable CO2RR to HCOOH electrocatalysts. © 2025 Elsevier B.V.

关键词： Electrolytic reduction

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Accelerated life-time test of MEA durability under vehicle operating conditions in PEM fuel cell

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Frontiers in Energy 2017年第3期11卷 326-333页

作者： Tian TIAN Jianjun TANG Wei GUO Mu PAN State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Hubei Provincical Key Laboratory of Fuel Cell Wuhan University of Technology Wuhan 430070 China

In this paper, a novel accelerated test method was proposed to analyze the durability of MEA, considering the actual operation of the fuel cell vehicle. The proposed method includes 7 working conditions： open circuit voltage （OCV）, idling, rated output, overload, idling-rated cycle, idling-overload cycle, and OCV-idling cycle. The experimental results indicate that the proposed method can effectively destroy the MEA in a short time （165 h）. Moreover, the degradation mechanism of MEA was analyzed by measuring the polarization curve, CV, SEM and TEM. This paper may provide a new research direction for improving the durability of fuel cell.

关键词： polymer electrolyte membrane fuel cell accelerated life-time test load cycling test durability

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Fluoridation and Sintering of Hydroxyapatite Material and Their Mechanical Properties

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Journal of Wuhan University of technology(materials Science) 2014年第1期29卷 190-196页

作者： Muhammad Asif 付正义 WANG Weimin WANG Hao TAN Tiening Shahzad Ahmad Khan State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

In the current work hydroxyapatite Ca10(PO4)6 ·OH2(HA) was sintered with the addition of 3 wt% aluminum isopropoxide(C9H21AlO3) powder and 3 wt % Teflon powder(-C2 F2-). Sample was prepared by following sol-gel technique. Obtained pellets of samples were sintered. For investigation of effects of temperature on microstructures and mechanical properties the samples were sintered at various temperatures. For studying the phase composition, microstructures and elemental analysis the sintered samples were characterized by X-rays diffraction(XRD), scanning electron microscopy(SEM) and energy dispersive X-rays diffraction(EDAX) respectively. After sintering the samples mechanical properties, i e, grains size, apparent density, Vickers hardness, bending strength and compressive strength were found to be 2.14-18.76 μm, 1.523 6-0.752 g/cm3, 3.60-0.600 GPa and bending strength 33.265 8-14.900 MPa, 75-33 MPa, respectively. As a result of sintering fluoridated composite material was obtained.

关键词： fluoridated hydroxyapatite pressureless sintering mechanical properties hydroxyapatite materials

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Simulation research of thermionic emission process and impact of voltage parameters in the three-pole electron gun

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Results in Physics 2025年 70卷

作者： Hu, Haoyang Zhao, Yue Shang, Pengcheng Zhang, Feibin Wu, Aiping Zhao, Haiyan Li, Lihang State Key Laboratory of Clean and Efficient Turbomachinery Power Equipment Department of Mechanical Engineering Tsinghua University Beijing 100084 China Key Laboratory for Advanced Materials Processing Technology Ministry of Education Beijing 100084 China Department of Mechanical Engineering Tsinghua University Beijing 100084 China State Key Laboratory of Tribology in Advanced Equipment Tsinghua University Beijing 100084 China Science and Technology on Power Beam Processes Laboratory AVIC Manufacturing Technology Institute Beijing 100024 China

The three-pole electron gun is composed of cathode, anode and grid electrode, which can effectively control the emission beam current and is widely used in welding and additive manufacturing equipment. However, the characteristics of the emission beam and the process of beam control have yet to be fully and accurately elucidated. Considering that the characteristics of the electron beam at the emission stage have a significant effect on the beam quality, the electric field distribution and electron beam trajectory at the emission stage are studied based on the simulation method of bidirectionally coupled particle tracing. The results show that a spatial potential barrier several tens of microns high is formed on the cathode surface. The different relative potential across the barrier at different positions leads to the non-uniform effective emission beam density of the cathode. With the increase of bias voltage, the effective emission area and emission beam density decrease simultaneously. The average emission beam density varies with the accelerating voltage, which does not follow the Child-Langmuir law, but exhibits a more significant trend of variation. The present work proposes a modified formula suitable for the three-pole electron gun for calculating the average emission beam density, obtaining good fitting results. © 2025

关键词： Beam emission Numerical simulations Potential barrier Process parameters Three-pole electron gun

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Binding of Streptavidin to Surface-attached Biotin with Different Spacer Thicknesses

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Journal of Wuhan University of technology(materials Science) 2015年第6期30卷 1304-1309页

作者：李易非张海宁 Wuhan University of Technology Hospital State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

The specific binding of receptor to ligand covalently attached to surface with different surface densities was studied using streptavidin-biotin model pair. Biotinylated substrates with different spacer thicknesses as formed through a simple reaction between amine immobilized surfaces and N-hydroxysucciimide groups at the end of biotin modifi ed PEG in anhydrous organic solutions（＂grafting to＂ technique）. The amount of the specifi cally adsorbed protein was measured as a function of spacer thickness between hard surface and biotin moieties. It has been shown that the amount of specifically adsorbed streptavidin decreases with the increase spacer thickness and the protein adsorbs onto the functionalized surfaces in a single molecular manner. It provides an interesting model system for studying single molecular interactions.

关键词： specifi c interaction biotin streptavidin polymer monolayer spacer thickness

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Effects on the thermal expansion coefficient and dielectric properties of CLST/PTFE filled with modified glass fiber as microwave material

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Chinese Chemical Letters 2019年第5期30卷 1111-1114页

作者： Liu Zheng Jing Zhou Jie Shen Yanyuan Qi Wen Chen State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Materials Science and Engineering Wuhan University of Technology

Ceramic and polytetrafluoroethylene composites as dielectric materials have a low dielectric loss at high frequency and play an important role in the modern communication ***,room temperature phase transformation of PTFE resins,which is accompanied by a large volume change(>400 ppm/℃),seriously affects the dimensional stability and performance stability of *** LD125 modified glass fiber(GF)was introduced to the CaO-Li2 O-Sm2O3-TiO2(CLST)/PTFE composite,to reduce the thermal expansion coefficient(CTE)of the *** tri-phase composites(CLST/PTFE/GF)show the low dielectric loss and excellent *** effect of GF content on the dielectric properties and CTE was also *** CLST/PTFE filled with 5%GF exhibits the best overall performance,which is a promising microwave dielectric material for microwave communication.

关键词： Microwave communication Thermal expansion coefficient CLST PTFE Dielectric loss Dielectric constant

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