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Hierarchical mesoporous urchin-like Mn 3 O 4 /carbon microspheres with highly enhanced lithium battery performance by in-situ carbonization of new lamellar manganese alkoxide (Mn-DEG)

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Nano Energy 2015年 12卷 833-844页

作者： Shao-Zhuan Huang Yi Cai Jun Jin Jing Liu Yu Li Yong Yu Hong-En Wang Li-Hua Chen Bao-Lian Su Laboratory of Living Materials at the State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan Hubei China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium Department of Chemistry and Clare Hall College University of Cambridge Cambridge United Kingdom

Two types of hierarchical mesoporous urchin-like Mn 3 O 4 /carbon microspheres (HM-MO/C-MS) have been prepared via the in situ carbonization of the newly synthesized lamellar manganese alkoxide (Mn-DEG) along with the crystallization of Mn 3 O 4 in air (MO-A) and nitrogen (MO-N), respectively. Such unique HM-MO/C-MS with high surface area provides obvious advantages including a large contact area with electrolyte, a short transport path for Li + ions, a low resistance for charge transfer, and a superior structural stability. When used as an anode material for lithium ion batteries in the voltage range of 0.01–3 V, the HM-MO/C-MS obtained in nitrogen (MO-N) exhibits high lithium storage capacity (915 mA h g −1 at 100 mA g −1 for 50 cycles), great cycling stability (94.5% capacity retention versus the second cycle) and excellent rate capability (510 mA h g −1 at 1000 mA g −1 ). In particular, when cycling at a high current density of 1500 mA g −1 , the reversible capacity of the MO-N sample can still be maintained as high as 480 mA h g −1 with a high capacity retention of 93.7% after 200 cycles. Even in a narrower voltage range of 0.01–1.5 V, the lithium storage capacity of the MO-N sample can reach 556 mA h g −1 at 100 mA g −1 with a very good cycling stability (over 91% capacity retention from the second cycle) and have an excellent rate capability of 269 mA h g −1 at 1000 mA g −1 . Both MO-N and MO-A samples present a very high volumetric capacity of 741.2 mA h cm −3 and 647.4 mA h cm −3 at 100 mA g −1 , respectively. Such high performances both in the voltage ranges of 0.01–3 V and 0.01–1.5 V are among the highest reported. Ex-situ SEM images showed clearly the excellent morphological and structural stability of our materials. The results demonstrate that the unique hierarchical mesoporous microspheres/carbon structure is favorable for improving the cyclability and rate capability in energy

关键词： Lamellar manganese alkoxide Carbonization Hierarchically porous Mn 3 O 4 /carbon microspheres Anode materials Li battery

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Applications of hierarchically structured porous materials from energy storage and conversion, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine

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Chemical Society reviews 2016年第12期45卷 3479-563页

作者： Ming-Hui Sun Shao-Zhuan Huang Li-Hua Chen Yu Li Xiao-Yu Yang Zhong-Yong Yuan Bao-Lian Su State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China. chenlihua@*** baoliansu@***. Collaborat Innovat. Ctr. Chem. Sci. & Engn. Tianjin Key Lab. Adv. Energy Mat. Chem. Minist. Educ. Coll. Chem. Nankai Univ. Tianjin 300071 China. State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Luoshi Road 122 Wuhan 430070 China. chenlihua@*** baoliansu@*** and Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium. bao-lian.su@unamur.be and Clare Hall University of Cambridge Cambridge CB2 1EW UK. bls26@cam.ac.uk.

Over the last decade, significant effort has been devoted to the applications of hierarchically structured porous materials owing to their outstanding properties such as high surface area, excellent accessibility to active sites, and enhanced mass transport and diffusion. The hierarchy of porosity, structural, morphological and component levels in these materials is key for their high performance in all kinds of applications. The introduction of hierarchical porosity into materials has led to a significant improvement in the performance of materials. Herein, recent progress in the applications of hierarchically structured porous materials from energy conversion and storage, catalysis, photocatalysis, adsorption, separation, and sensing to biomedicine is reviewed. Their potential future applications are also highlighted. We particularly dwell on the relationship between hierarchically porous structures and properties, with examples of each type of hierarchically structured porous material according to its chemical composition and physical characteristics. The present review aims to open up a new avenue to guide the readers to quickly obtain in-depth knowledge of applications of hierarchically porous materials and to have a good idea about selecting and designing suitable hierarchically porous materials for a specific application. In addition to focusing on the applications of hierarchically porous materials, this comprehensive review could stimulate researchers to synthesize new advanced hierarchically porous solids.

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First principles study of oxidation behavior of irradiated graphite

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Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with materials and Atoms 2015年 352卷 160-166页

作者： Juan Liu Limin Dong Chen Wang Tongxiang Liang Wensheng Lai Beijing Key Lab of Fine Ceramics Institute of Nuclear and New Energy Technology Tsinghua University Beijing 100084 China State Key Lab of New Ceramic and Fine Processing Tsinghua University Beijing 100084 China Advanced Material Laboratory School of Materials Science & Engineering Tsinghua University Beijing 100084 China

The relationship between nuclear graphite microstructure and its oxidation resistance underlines the importance of comprehensive oxidation characterization studies of the new grades of nuclear graphite. Periodic DFT calculations are performed to model oxidation behavior of irradiated graphite. O 2 molecules adsorbed on perfect and defective graphite surfaces are calculated. The adsorptive energy of O 2 on defective graphite adsorption site with one carbon atom missing is approximately 10 times as strong as that on a defect-free perfect graphite surface. Monovacancy and divacancy on graphite surface can easily chemisorb O 2 molecule compared to perfect surface. Two oxidation processes including CO and CO 2 formation steps are analyzed. For symmetric monovacancy defect, three dangling C atoms are unsaturated and exhibit high adsorption ability, as well as reconstructed monovacancy and divacancy defects. These vacancy defects in irradiated graphite decrease oxidation resistance of nuclear graphite.

关键词： Nuclear graphite Irradiation Oxidation First-principles calculation

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The effect of diluent gases on the growth of β-SiC films by laser CVD with HMDS

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materials Research Innovations 2015年 19卷 403-407页

作者： Zhu, P.P. Tu, R. Zhang, S. Han, M.X. Xu, Q.F. Sun, Q.Y. Zhang, L.M. Goto, T. Yan, J.S. Li, S.S. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road Wuhan430070 China Institute for Materials Research Tohoku University 2-1-1 Katahira Aoba-ku Sendai980-8577 Japan Tech Semiconductors Ltd Xiangyang441000 China

β-SiC films have been fabricated on (100) Si substrates by laser chemical vapour deposition using hexamethyldisilane ((CH3)3-Si-Si-(CH3)3) as a source precursor while argon or hydrogen as a diluent gas, respectively. The effects of different diluent gases species on the microstructure and deposition rate have been investigated by varying the flow rate of hexamethyldisilane (fHMDS). The results showed that pyramid, flower and needle-like morphologies were obtained using argon as diluent gas, whereas only pyramid with little flower structure appeared in the case of hydrogen. The deposition rate (Rdep) was in proportion to the fHMDS irrespective of diluent gases. Rdep was nearly 50% higher for hydrogen as diluent gas. © 2015 W. S. Maney & Son Ltd.

关键词： Microstructure

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Effects of the Interaction between Hydroxyapatite Nanoparticles and Hepatoma Cells

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Journal of Wuhan University of technology(materials Science) 2014年第3期29卷 635-642页

作者：尹美珍 XU Weiguo CUI Bingcun 戴红莲 HAN Yingchao YIN Yixia LI Shipu School of Medicine Hubei Polytechnic University Tongji Hospital Tongji Medical College Huazhong University of Science and Technology State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Biomedical Materials and Engineering Center Wuhan University of Technology

To gain a better understanding of the anticancer effects of hydroxyapatite （HAP） nanoparticles in vivo and in vitro, the effects of the interaction of HAP nanoparticles with hepatoma cells were explored. HAP nanoparticles were prepared by homogeneous precipitation and characterized by laser particle analysis and transmission electron microscopy （TEM）. HAP nanoparticles were observed to be uniformly distributed, with rod-like shapes and diameters in the range of 42.1-87.1 nm. Overnight attached, suspended, and proliferating Bel-7402 cells were incubated with HAP nanoparticles. Inverted microscopy observation revealed that HAP nanoparticles with a cell membrane showed good adsorption. TEM demonstrated that HAP nanoparticles were present on the surface of cells, continuously taken up by cells through endocytosis, and transported in vesicles close to the nucleus. Fluorescence microscopy showed that the concentrations of intracellular Ca2＋ labeled with Fluo-3 calcium fluorescent probe were significantly enhanced. In addition, inverted microscopy observation revealed that suspended cells treated with HAP nanoparticles did not adhere to the culture bottle, resulting in cell death. After the overnight attached cells were treated with HAP nanoparticles for 96 h with increasing doses of HAP nanoparticles, inverted microscopy observation revealed that cell proliferation was slowed and ceU-ceU adhesion was weakened. Feulgen staining and image analysis indicated that the nuclear DNA content of the cells was markedly reduced, and argyrophilic nucleolar organizer region （AgNOR） staining and image analysis indicated that the number of AgNORs was significantly decreased. Therefore, hepatoma cells brought about the adsorption, uptake, transport and degradation of HAP nanoparticles. In addition, HAP nanoparticles affected hepatoma cells with regard to cell-cell adhesion, cell and extracellular matrix adhesion, and DNA and protein synthesis; thus inhibiting cell proliferation. This und

关键词： hydroxyapatite nanoparticles hepatoma cells interaction effects cell adhesion

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Microstructure and Mechanical Properties of Ductile Cast Iron in Lost Foam Casting with Vibration

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Journal of Iron and Steel Research International 2014年第11期21卷 1049-1054页

作者： Bo-tao XIAO Zi-tian FAN Wen-ming JIANG Xin-wang LIU Wei LONG Qiang HU State Key Laboratory of Material Processing and Die & Mould Technology Huazhong University of Science and Technology School of Materials Science and Engineering Jiangxi Science and Technology Normal University School of Mechanical & Electrical Engineering Wuhan Institute of Technology Jiangxi Key Laboratory for Advanced Copper and Tungsten Materials Jiangxi Academy of Sciences

The microstructures and mechanical properties of the ductile cast iron （DI） specimens obtained by lost foam casting （LFC） with and without vibration were investigated. The results indicate that the number of the graphite nodule increases from 175 mm 2 of the specimens produced by LFC without vibration to 334 mm^-2 of the specimens produced by LFC with vibration, and the thickness of the ferrite shell increases. Meanwhile, the amount of the carbides decreases in the specimens produced by LFC with vibration and the granule structure then forms. These are mainly attributed to the ＂crystal shower＂ caused by the vibration. In addition, the tensile strength and elongation of DI specimens produced by LFC with vibration are improved due to the dispersion-strengthening of refined carbide and Dearlite colonv, uniform distribution of the graphite nodule, and increase of the amount of dimples and tearing edges.

关键词： ductile cast iron （DI） microstructure mechanical property mechanical vibration lost foam casting （LFC）

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Mechanical alloying and spark plasma sintering of CoCrFeNiMnAl high-entropy alloy

Mechanical alloying and spark plasma sintering of CoCrFeNiMn...

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作者： Wang, Chao Ji, Wei Fu, Zhengyi Department of Architecture and Material Engineering Hubei University of Education Wuhan430205 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

An equiatomic CoCrFeNiMnAl high-entropy alloy was synthesized by mechanical alloying, and alloying behaviors, microstructure and annealing behaviors were investigated. It was found that a solid solution with refined microstructure of 20 nm in grain size could be obtained after 30 h milling. As-milled powder transformed into a face-centered cubic phase above 500 °C. The as-milled powder was subsequently consolidated by spark plasma sintering at 800 °C, BCC phase and FCC phase coexisted in the consolidated HEA, which had excellent properties in Vickers hardness of 662 HV and compressive strength of 2142 MPa. © 2014 The Society of Powder technology Japan. Published by Elsevier B.V. and The Society of Powder technology Japan. All rights reserved.

关键词： Mechanical alloying

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Microstructural evolution and mechanism of grain growth in magnesia ceramics prepared by high pressure and temperature with ultra-high heating rate

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Science China(Technological Sciences) 2014年第6期57卷 1085-1092页

作者： LIU JiangHao FU ZhengYi WANG WeiMin ZHANG JinYong WANG Hao WANG YuCheng LEE SooWohn NIIHARA Koichi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Department of Environmental Engineering Sun Moon University Extreme Energy-Density Research Institute Nagaoka University of Technology1603-1 KamitomiokaNagaokaNiigata 940-2188Japan

The fast densification method of combustion reaction plus quick pressing was adopted to prepare nanocrystalline *** densification process of magnesia compact with a particle size of 100 nm was investigated,under the applied pressure of up to 170 MPa,and the temperature range of 1740–2080 K with ultra-high heating rate(above 1700 K/min).High-purity magnesia ceramics with a relative density of 98.8%and an average grain size of 120 nm was obtained at 1740 K,and the grain growth during the densification process was effectively *** characteristic morphology of evaporation-condensation was observed in the compact prepared at 2080 K,which revealed the actual process of mass transfer by gas ***,the investigation on the microstructure evolution and mechanism of grain growth was carried out,on the basis of as-preserved nanocrystalline *** result indicated that the grain growth of the nanocrystalline MgO was controlled by the mechanism of evaporation-condensation rather than surface ***,the pressure had an influence of restraining the grain growth based on solid diffusion and strengthening the effect of gas diffusion with the increasing *** the particular conditions,there existed an appropriate temperature for the densification of nanocrystalline magnesia,while the excessive temperature would exaggerate grain growth and impede densification.

关键词： grain growth densification heating rate evaporation-condensation surface diffusion nanocrystalline ceramics

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Graphene-based composite photocatalyst for solar fuel production

Graphene-based composite photocatalyst for solar fuel produc...

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中国化学会第29届学术年会

作者： Jiaguo Yu State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology

The production of solar fuels by solar energy conversion is considered to be one of major strategies for solving the global energy and environmental problems in the future. Photocatalytic water splitting for H2 production and CO2 reduction for methane formation have become important and promising methods for clean, economical, and renewal production of solar fuels by using solar light since Fujishima and Honda first reported the photoelectrochemical water splitting on a TiO2 electrode in 1972. Among various semiconductors, titania(TiO2) has attracted special attention because of its strong oxidizing and reduction power, cost effectiveness, lack of toxicity, and high photochemical corrosive resistance. Usually, the photocatalytic H2-production activity on TiO2 is significantly dependent on the type and amount of co-catalyst because bare TiO2 has poor photocatalytic H2-Production activity. It is well-known that the loading of Pt as a co-catalyst on TiO2 significantly enhances H2-production activity for photocatalytic water splitting in the presence of sacrificial reagents. However, Pt is a rare and expensive noble metal. Therefore, alternative co-catalysts based on non-precious metals and earth-abundant materials have been actively pursued. Graphene-based nanocpmposite photocatalysts have recently caused tremendous interest as a viable alternate to increase photocatalytic H2-production and CO2-reduction performance in converting solar energy into chemical energy. The use of graphene as cocatalyst and support to enhance the H2-production activity of photocatalysts has been confirmed due to its unique two-dimensional conjugated structure and electronic properties. In this talk, I will present our recent work on the design and fabrication of graphene-based nanocomposite photocatalytic materials for H2 production and CO2 reduction. The rational designs for high-performance photocatalytic materials using graphene-based materials are described. Our work also demonstrates gr

关键词： Graphene-based composite photocatalyst for solar fuel production

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Carbon nanotubes suspended in ethylene glycol yield nanofluids with enhanced heat transfer properties 13

Carbon nanotubes suspended in ethylene glycol yield nanoflui...

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13th International Conference on Simulation and Experiments in Heat and Mass Transfer, HT 2014

作者： Cheng, H.B. Ma, W.T. Hu, W. Wu, J.F. Xiao, J. Chen, Z.B. Zhang, Q.J. Wereley, N.M. State Key Laboratory of Advanced technology for Materials Synthesis and Processing Wuhan University of Technology China Department of Aerospace Engineering University of Maryland United States

ISBN: (纸本)9781845647940

Nanofluids (NFs) consisting of carbon nanotubes (CNTs) suspended in ethylene glycol (EG) were synthesized, and their stability and thermal conductivity enhancement rate were investigated. Stability of the CNT/EG-based NFs was enhanced by adding gum Arabic (GA). The increase in suspension stability was experimentally characterized using static and centrifugal testing processes. The mechanisms of GA in enhancing the fluid stability were characterized and the optimal mass ratio of GA to CNT was found to be about 11% by weight. Thermal conductivity was measured for varying CNT volume fraction under different fluid temperatures, and a nearly linear relationship between the thermal conductivity and the CNT volume fraction and temperature was observed. © 2014 WIT Press.

关键词： Stability

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