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Catalytic Removal of PM by Li-Co Delafossite Catalysts

Journal of Wuhan University of technology(materials Science) 2015年第2期30卷 433-435页

作者：王伟 ZHANG Jichen 肖静 LUO Dabing School of Automotive Engineering Wuhan University of Technology Hubei Province Key Laboratory of Modern Automotive Technology Hubei Province Automotive Parts Synergy Innovation Center State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology

By using solution combustion synthesis method, several Li-Co delafossite catalysts were prepared via a highly exothermic and self-sustaining reaction. The prepared catalysts were characterized by XRD, SEM and the catalytic activities of the catalysts were evaluated by small sample experiment. It is shown that under loose contact conditions this catalyst can catalyze soot combustion at 360 ℃, and the best prepared catalyst Li Co0.9O2 can ignite soot combustion below 300 ℃. In the incompletely synthesized catalysts the Co cations shift to higher electrovalence, so the number of the surface adsorbed oxygen（O-） of the prepared delafossite catalysts increase and Li Co0.9O2 has the optimum catalytic activity.

关键词： solution combustion synthesis delafossite catalysts particulate matter

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Catalytic Activity of Iridium Dioxide With Different Morphologies for Oxygen Reduction Reaction

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Journal of Wuhan University of technology(materials Science) 2015年第5期30卷 882-887页

作者：汪广进 HUANG Fei XU Tian YU Yi CHENG Feng ZHANG Yue 潘牧 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cell College of Chemistry and Materials Science Hubei Engineering University Sericultural & Agri-food Research Institute Guangdong Academy of Agricultural Sciences/Key Laboratory of Functional Foods Ministry of Agriculture/Guangdong Key Laboratory of Agricultural Products Processing

Iridium dioxide with different morphologies(nanorod and nanogranular) is successfully prepared by a modified sol-gel and Adams methods. The catalytic activity of both samples for oxygen reduction reaction is investigated in an alkaline solution. The electrochemical results show that the catalytic activity of the nanogranular Ir O2 sample is superior to that of the nanorod sample due to its higher onset potential for oxygen reduction reaction and higher electrode current density in low potential region. The results of Koutecky-Levich analysis indicate that the oxygen reduction reaction catalyzed by both samples is a mixture transfer pathway. It is dominated by four electron transfer pathway for both samples in high overpotential area, while it is controlled by two electron transfer process for both samples in low overpotential area.

关键词： Iridium dioxide modified sol-gel method Adams method oxygen reduction reaction

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Evaluation on biocompatibility of biomedical polyurethanes with different hard segment contents

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Frontiers of materials Science 2015年第4期9卷 397-404页

作者： Dai-Wei MA Rong ZHU Yi-Yu WANG Zong-Rui ZHANG Xi n-Yu WANG State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China Biomedical Materials and Engineering Research Center of Hubei Province Wuhan University of Technology Wuhan 430070 China

In this paper, polyurethane （PU） materials with different contents of hard segment （20%, 25%, 30%） were prepared based on hexamethylene diisocyanate and polycarbonate diols by solution polymerization. The obtained polycarbonate-urethane （PCU） elastomers were characterized by very good hydrophobic property and excellent resistance to hydrolysis. Hemolysis, recalification time and platelet-rich plasma adhesion were used to evaluate the blood compatibility of the materials. L929 cells cultured with leach liquor of these PU membranes were selected to perform the cytotoxicity experiments. The results indicate that the hemolysis rates of PU membranes are all less than 5%, which can meet the requirement of the national standards for biomaterials. However, compared with 20% and 30% groups, the recalification time of the sample containing 25% hard segment is longer, while the number of platelet adhesion is less. Additionally, cells cultured in the leach liquor of PU membranes with 25% hard segment proliferated relatively more thriving, meaning that this proportion of the material has the lowest cytotoxicity.

关键词： polyurethane （PU） hydrolytic stability blood compatibility cytotoxicity

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Preparation and properties of triazine dithiol-silane composite self-assembled hydrophobility films on stainless steel surfaces

Preparation and properties of triazine dithiol-silane compos...

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2014 - China Functional material technology and Industry Forum, CFMTIF 2014

作者： Hu, Ming-Ming Zhang, Dong-Ming State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9783038353522

Self-assembled method for controllable fabrication of a hydrophobic triazine dithiol-silane composite film on 304 stainless steel (SS) is reported in this paper. Hierarchical structure composed of micro/nano-featherlike surface was obtained by acid etching. After modification with 2-(Dibutylamino)-4,6-dimercapto-1,3,5-triazine (DB) and n-octadecyltrichlorosilane (OTS), the suface became hydrophobicity. By applying SEM, FTIR-RAS, and water contact angle analysis, the surface morphology and hydrophobicity of the as-prepared surfaces were studied in detailed. The results indicated that at the optimal condition, the surface showed a good hydrophobicity with a water contact angle as high as 152±3°. Possible growth mechanism of featherlike hierarchical structure was discussed. Additionally, the anticorrosion effect of the hydrophobic surface was studied by potentiodynamic polarization measurement. It showed that the surface covered with hydrophobic composite film was found to be more positive than bare and monolayer, the corrosion current was significantly lower to 1.68 nA/cm2, and the corrosion potential shifted positively from -253 mV to -118 mV (vs SEC). © (2015) Trans Tech Publications, Switzerland.

关键词： Hydrophobicity

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Solar Fuel Photocatalysts

Solar Fuel Photocatalysts

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Photonics for Energy, PFE 2015

作者： Yu, Jiaguo State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

ISBN: (纸本)9781943580019

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 H2 production by water splitting and photocatalytic hydrocarbon formation by CO2 reduction have become important and promising methods for clean, economical, and renewal production of solar fuels by using solar light. Usually, the photocatalytic H2-production performance on TiO2 is strongly 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 intersively pursued in recent years.

关键词： Graphene Metals Solar energy Solar fuels Titanium dioxide

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Density functional theory investigation of oxygen interaction with boron-doped graphite

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Applied Surface Science 2016年 390卷 273-282页

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

Boron inserted as impurity by substitution of carbon atoms in graphite is known to change (improve or deteriorate) oxidation resistance of nuclear graphite, but the reason for both catalytic and inhibiting oxidation is still uncertain. As a first step, this work is more specially devoted to the adsorption and diffusion of oxygen atoms on the surface and related to the problem of oxygen retention on the pure and boron-containing graphite surfaces. Adsorption energies and energy barriers associated to the diffusion for molecular oxygen recombination are calculated in the density functional theory framework. The existence of boron modifies the electronic structure of the surface, which results in an increase of the adsorption energy for O. However, low boron loading makes it easier for the recombination into molecular oxygen. For high boron concentration, it induces a better O retention capability in graphite because the presence of B-B bonds decreases recombination of the adsorbed oxygen atoms. A possible explanation for both catalytic and inhibiting effects of boron in graphite is proposed.

关键词： Density functional calculations Chemisorption Graphite Boron Oxygen

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Graphene Foams: A Bubble‐Derived Strategy to Prepare Multiple Graphene‐Based Porous materials (Adv. Funct. Mater. 23/2018)

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advanced Functional materials 2018年第23期28卷

作者： Rujing Zhang Ruirui Hu Xinming Li Zhen Zhen Zhenhua Xu Na Li Limin He Hongwei Zhu Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material Department 5 P.O. Box 81‐5 AECC Beijing Institute of Aeronautical Materials Beijing 100095 China State Key Lab of New Ceramics and Fine Processing School of Materials Science and Engineering and Center for Nano and Micro Mechanics Tsinghua University Beijing 100084 China International Center for Materials Nanoarchitectonics (WPI‐MANA) National Institute for Materials Science (NIMS) 1‐1 Namiki Tsukuba Ibaraki 305‐0044 Japan

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Crystallization of calcium carbonate under the influences of casein and magnesium ions

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RSC Advances 2016年第111期6卷 110362-110366页

作者： Zhang, Ao Xie, Hao Liu, Nian Chen, Bao-Li Ping, Hang Fu, Zheng-Yi Su, Bao-Lian School of Chemistry Chemical Engineering and Life Science Wuhan University of Technology Wuhan430070 China Laboratory of Living Materials State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Laboratory of Inorganic Materials Chemistry University of Namur NamurB-5000 Belgium

Various proteins and molecules are involved in the crystallization pathways of biomineralization. The present study investigated the involvement of casein and magnesium ions in the crystallization of calcium carbonate (CaCO3). The calcium carbonate crystals obtained under the control of casein and magnesium ions were characterized by various techniques such as XRD and FTIR. Results showed that the morphology of the CaCO3 crystals was significantly affected by casein and magnesium ions. The secondary structure of casein proteins and the size of casein micelles play important roles in the morphological construction of CaCO3 crystals. Magnesium ions can directly interact with CaCO3 crystals to affect the morphology. Magnesium ions are also indirectly involved in the casein assisted CaCO3 mineralization by affecting the size of casein micelles to regulate the CaCO3 mineralization. This work may not only provide insight into natural biomineralization process, but also be helpful in designing and synthesizing novel functional materials. © 2016 The Royal Society of Chemistry.

关键词： Calcium carbonate

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Influence of TiO2 additive on the microwave dielectric properties of α-CaSiO3-Al2O3 ceramics

Influence of TiO2 additive on the microwave dielectric prope...

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作者： Hu, Wei Liu, Hanxing Hao, Hua Yao, Zhonghua Cao, Minghe Wang, Zhijian Song, Zhe State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan Hubei430070 China

The effects of TiO2 additives on microstructure and microwave dielectric properties of α-CaSiO3-2 wt%Al2O3 ceramics have been investigated in detail. Specifically, the TiO2 addition results in the presence of two distinct phases, e.g. CaTiO3 and CaTiSiO5, which can inhibit the growth of α-CaSiO3 grains by surrounding their boundaries and also improve the bulk density of α-CaSiO3-2 wt%Al2O3 ceramics. However, the TiO2 addition undermines the microwave dielectric properties of the title ceramics because the derived phases of CaTiO3 and CaTiSiO5 have poor quality factor. The τf value is strongly correlated to the compositions and can be controlled through the compositional ratio. The α-CaSiO3-2 wt%Al2O3 ceramics containing 2.5 wt% of TiO2 sintered at 1250 °C showed excellent microwave dielectric properties (Εr=7.88, Q×f=24,412 GHz and τf=-0.52 ppm/°C). © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.

关键词： Titanium dioxide

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Integrated Intercalation-Based and Interfacial Sodium Storage in Graphene-Wrapped Porous Li4Ti5O12 Nanofibers Composite Aerogel

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advanced Energy materials 2016年第13期6卷

作者： Chen, Chaoji Xu, Henghui Zhou, Tengfei Guo, Zaiping Chen, Lineng Yan, Mengyu Mai, Liqiang Hu, Pei Cheng, Shijie Huang, Yunhui Xie, Jia State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan430074 China State Key Laboratory of Materials Processing and Die and Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China School of Mechanical Materials and Mechatronics Engineering University of Wollongong North WollongongNSW Australia State Key Laboratory of Advanced Technology for Materials Synthesis and Processing WUT-Harvard Joint Nano Key Laboratory Wuhan University of Technology Wuhan430070 China Collaborative Innovation Center of Intelligent New Energy Vehicle Tongji University Shanghai201804 China

Sodium storage in both solid–liquid and solid–solid interfaces is expected to extend the horizon of sodium-ion batteries, leading to a new strategy for developing high-performance energy-storage materials. Here, a novel composite aerogel with porous Li4Ti5O12 (PLTO) nanofibers confined in a highly conductive 3D-interconnected graphene framework (G-PLTO) is designed and fabricated for Na storage. A high capacity of 195 mA h g−1 at 0.2 C and super-long cycle life up to 12 000 cycles are attained. Electrochemical analysis shows that the intercalation-based and interfacial Na storage behaviors take effect simultaneously in the G-PLTO composite aerogel. An integrated Na storage mechanism is proposed. This study ascribes the excellent performance to the unique structure, which not only offers short pathways for Na+ diffusion and conductive networks for electron transport, but also guarantees plenty of PLTO–electrolyte and PLTO–graphene interfacial sites for Na+ adsorption. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

关键词： Storage (materials)

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