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Growth of magnetic metals on carbon microspheres with synergetic dissipation abilities to broaden microwave absorption

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Journal of materials Science & technology 2022年第12期107卷 100-110页

作者： Biao Zhao Yang Li Qingwen Zeng Bingbing Fan Lei Wang Rui Zhang Renchao Che Laboratory of Advanced Materials Shanghai Key Lab of Molecular Catalysis and Innovative MaterialsFudan UniversityShanghai 200438China Department of Materials Science Fudan UniversityShanghai 200438China Henan Key Laboratory of Aeronautical Materials and Application Technology School of Material Science and EngineeringZhengzhou University of AeronauticsZhengzhouHenan 450046China School of Material Science and Engineering Zhengzhou UniversityZhengzhouHenan 450001China State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China

Microwave absorption(MA) materials have been captured extensive attentions due to the serious electromagnetic(EM) pollution. Numerous interests focus on the MA performances of core-shell structural composites with magnetic constituents as cores and dielectric constituents as shells, which inevitably suppressed the magnetic coupling causing the decrease of magnetic loss to some extent. Herein, the coreshell structural carbon(C) microsphere/magnetic metal composites were fabricated through the combination of an electrostatic assembly approach and subsequent in-situ reduction reaction. The complex permittivity and permeability of core-shell C@magnetic metal composite system can be effective adjusted by the constituent and microstructure of shells. Thanks to the distinct magnetic coupling from the subtle designed structures and the promotion of the magnetic-dielectric synergy, the C@magnetic metal composite exhibited enhanced MA properties. The optimal reflection loss(RL) of C@Ni composite was-54.1 dB with a thickness of 3.4 mm, meanwhile the effective absorbing band could reach over 5.5 GHz at only a1.8 mm thickness. Broad absorption bandwidth with RL below-10 d B could achieve 6.0 GHz and 6.7 GHz for C@Co and C@Ni Co composites with a thin 2.1 mm thickness, respectively. Our exciting findings might lead a guide on the novel structure design for the functional core-shell structural composites used for microwave absorption.

关键词： Microwave absorption Core-shell structure C@magnetic metal composite Interfacial polarization Magnetic coupling

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Recent progress on highly efficient bulk heterojunction polymer solar cells

Recent progress on highly efficient bulk heterojunction poly...

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作者： Xiao, Shengqiang Price, Samuel C. Zhou, Huaxing You, Wei Department of Chemistry University of North Carolina at Chapel Hill Chapel Hill NC 27599-3290 United States State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Bulk heterojunction polymer solar cells, based on thin films of polymer/fullerene blends, have progressed rapidly during the past few years. Efficiencies over 6% have been achieved in research lab.. In this chapter, a brief review on recent progress was given by focusing on polymers over 3% efficiency in bulk heterojunction solar cells. Design rationales were summarized, as well as the general methods for morphology control. © 2010 American Chemical Society.

关键词： Polymer solar cells

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A simultaneous thermal study in quantitative analysis of calcium oxalate hydrates

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Analytical Methods 2013年第24期5卷 6900-6903页

作者： Fei, Tao Hao, Xie Bao-Lian, Su Department of Biological Science and Biotechnology School of Science Wuhan University of Technology 122 Luoshi Road 430070 Wuhan China Lab. of Living Mat. at State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology 122 Luoshi Road 430070 Wuhan China 61 rue de Bruxelles B-5000 Namur Belgium Department of Chemistry University of Cambridge Lensfield Road Cambridge CB2 1EW United Kingdom

The potential use of simultaneous thermal technology has been explored for quantifying mixed calcium oxalate monohydrate and dihydrate, which are major mineral components of urinary stones. Based on the observation and theoretical analysis of thermal dehydration of calcium oxalates, an effective and simple method has been developed for quantitative analysis of calcium oxalate hydrates. The present approach would be useful in medical practice and in quantifying inorganic hydrates with water-containing crystals similar to calcium oxalate hydrates. © 2013 The Royal Society of Chemistry.

关键词： Hydrates

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Thermal Stress Calculation and Fabrication of 6063 Al/60SiC‐35Al‐5Si Graded materials by Spark Plasma Sintering

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AIP Conference Proceedings 2008年第1期973卷 844-849页

作者： Zhang Dongming Zhang Lianmeng Gu Xiaofeng Chen Fei State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 P.R. China

The high intensity of thermal stress was generated during fabrication of 6063 aluminum/60SiC‐35Al‐5Si double‐layer material. In order to decrease the thermal stress, graded materials of Al/60SiC‐35Al‐5Si was fabricated by spark plasma sintering. The CTE in the graded layer was controlled by SiC fraction and particle sizes. The calculation results indicate that the net stress of more than 800 MPa was generated in the double‐layer materials, but it decreased to 170 MPa or less in the graded materials. So the stability can be guaranteed in the graded composites. The graded layers also have the potential for high thermal conductivity, more than 180W/Mk for every layer, which satisfies the application.

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Effect of particles morphology of α-Al2O3 on sintering property of its compact

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Wuhan Ligong Daxue Xuebao/Journal of Wuhan University of technology 2006年第2期28卷 7-9+60页

作者： Qin, Lin-Qing Wu, Bo-Lin Center for Materials Research and Analysis Wuhan University of Technology Wuhan 430070 China State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

The effect of particle morphology of α-Al2O3 on sintering property of its compact is investigated in this paper. The morphology of α-Al2O3 particles and its compact were studied by SEM and TEM, and line-shrinkage rate, density and water absorption rate were measured respectively. The results showed that the expansion of compact at elevated temperature brought harm to densification and formation of homogenous structure of the compact and the sintering property of compact was influenced by the morphology of α-Al2O3 particles in different degrees.

关键词： α-Al2O3 Line-shrinkage rate Particle morphology Sintering property

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Numerical and experimental evaluation of the temperature and stress fields during plasma deposition dieless manufacturing 15

Numerical and experimental evaluation of the temperature and...

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15th International Symposium on Electromachining, ISEM 2007

作者： Wu, Sheng-Chuan Zhang, Hai-Ou Wang, Gui-Lan College of Mechanical Science and Engineering State Key Lab. of Digital Manufacturing Equipment and Tech. Huazhong University of Science and Technology Wuhan430074 China College of Materials Science and Engineering State Key Lab. of Material Processing and Die and Mould Tech. Huazhong University of Science and Technology Wuhan430074 China

ISBN: (纸本)0979497701

Plasma deposition dieless manufacturing is a rapid heating and solidification process, in which how to avoid cracks and distortions is a key problem. To explore the thermal behaviors of this process, the preheated and water-cooled programs were designed and evaluated numerically by finite element method and the watercooled scheme showed lower hot crackability and better formability. Thereafter, evolutions of the temperature and stress field were simulated based on the water-cooled scheme under optimized process conditions. Computational and experimental results confirm that reasonable process-cooled conditions can reduce the temperature and stress gradients and thus ultimately improve the possibly-intended formability.

关键词： Finite element method

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Particle size control of silver nanoparticles prepared by pulsed wire discharge in liquid media

Particle size control of silver nanoparticles prepared by pu...

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International Symposium on Multifunctional Ceramic materials Based on Nanotechnology, ISMCN 2010

作者： Tokoi, Y. Josho, K. Izuari, Y.M. Suzuki, T. Nakayama, T. Suematsu, H. Lee, W. Fu, Z. Niihara, K. Extreme Energy-Density Research Institute Nagaoka University of Technology Niigata 940-2188 Japan Department of Environmental Engineering Sun Moon University Chungnam 336-708 Korea Republic of State Key Lab. of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electrical circuit to the vaporization energy of the wire. From energy deposition calculated by the measured voltage and current waveforms, deposited energy of the wire was increased with increasing K. From X-ray diffraction (XRD) analysis, prepared nanoparticles were phase identified as silver. From transmission electron microscopy observations, the shape of prepared silver nanoparticles were spherical and the median particle diameter (D50) and the geometric standard deviation (σg) were calculated from the particle distribution. D50 was decreased from 34 to 19 nm with increasing K. The particle size in prepared by PWD in liquid media can be controlled by K.

关键词： Silver nanoparticles

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Bioinspired cellulose-integrated MXene-based hydrogels for multifunctional sensing and electromagnetic interference shielding

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Interdisciplinary materials 2022年第4期1卷 495-506页

作者： Jingjiang Wei Chenglong Zhu Zhihui Zeng Fei Pan Fuqiang Wan Liwen Lei Gustav Nyström Zhengyi Fu State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhanHubeiPR China Laboratory for Cellulose and Wood Materials Swiss Federal Laboratories for Materials Science and Technology(Empa)DübendorfSwitzerland Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials School of Material Science and EngineeringShandong UniversityJinanShandongPR China Laboratory for Biointerfaces Swiss Federal Laboratories for Materials Science and Technology(Empa)St.GallenSwitzerland Department of Health Science and Technology ETH ZürichZürichSwitzerland

Bioinspired hydrogels are complex materials with distinctive properties comparable to biological *** exceptional sensitivity to various external stimuli leads to substantial application potential in wearable smart ***,these multifaceted hydrogels are often challenging to be combined with pattern customization,stimulus responsiveness,self-healing,and ***,inspired by mussel secretions,a printable,self-healing,and biocompatible MXene-based composite hydrogel was designed and prepared by incorporating Ti3C2Tx MXene nanosheets into the hydrogel framework through the chelation of calcium ions(Ca2+)with polyacrylic acid and cellulose nanofibers at alkaline *** biocompatible conductive hydrogel exhibited sensitivity(gauge factor of 2.16),self-healing(within 1 s),recognition,and adhesion,distinguishing it as an ideal candidate for wearable multifunctional sensors toward strain sensing,vocal sensing,signature detection,and Morse code ***,the multifunctional hydrogel manifested efficient electromagnetic interference shielding properties(reaching more than 30 dB at a thickness of 2.0 mm),protecting electronics and humans from electromagnetic radiation and ***,the presented work represents a versatile strategy for developing environmentally friendly conductive hydrogels,demonstrating the perspectives of intelligent hydrogels for multifunctional applications.

关键词： cellulose nanofiber electromagnetic interference shielding hydrogel MXene sensor

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Preparation of Mesoporous V 2 O 5 @TiO 2 Composites with Enhanced Photoactivity for Gaseous Benzene Degradation

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Physics Procedia 2013年 48卷 38-45页

作者： Chunxia Zhao Subo Feng Wen Chen Xiaoyu Li Yanbao Song Jinqiao Cao State Key Laboratory of Advanced Technology for Materials Synthesis and Processing School of Material Science and Engineering Wuhan University of Technology Wuhan 430070 P.R.China

Mesoporous V 2 O 5 @TiO 2 composites were fabricated by an ultrasonic method with V 2 O 5 sol as the guest precursor. The prepared materials were characterized by powder X-ray diffraction, field emission-scanning electron microscopy, transmission electron microscope, X-ray photoelectron spectroscopy, UV-Vis spectroscopy and nitrogen sorption analysis. The results indicated that V 2 O 5 nanoparticles dispersed well on/into the porous structure of TiO 2 matrix. The composites presented typical IUPAC IV isotherms with type H 2 hysteresis loops, revealing the mesoporous structure. It was observed that V 2 O 5 loading led to red shift of the absorption edge to 540 nm and reduced the band gap < 3.0 eV. The V 2 O 5 @TiO 2 composites with V/Ti molar ratio of 0.1 exhibited outstanding degradation efficiency of gaseous benzene.

关键词： Mesoporous composites V2O5 TiO2 photoactivity benzene degradation

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Effects of PSMA and experimental conditions on the morphologies of BaCO_3 whiskers

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北京科技大学学报 2006年第8期28卷 773-773页

作者： CHENG Bei YU Xiaoxiao YU Jiaguo ZHAO Xiujian State Key Laboratory of Advanced Technology for Material Synthesis and Processing Wuhan University of Technology Wuhan 430070 China

BaCO3 whiskers exhibiting different morphologies were fabricated by a simple precipitation reaction of barium chloride with sodium carbonate in the absence and presence of poly-（styrene-alt-maleic acid）（PSMA） as a crystal growth modifier at room temperature. The as-prepared products were characterized by scanning electron microscopy （SEM）,transmission electron microscopy （TEM）,and X-ray diffraction （XRD）. The influences of experimental parameters on the size and morphology of BaCO3 whiskers were investigated and discussed. It was found that the as-prepared BaCO3 whiskers are single crystals with diameter ranging from 100 to 300?nm,and grow along the crystallographic a-axis or [100] direction. BaCO3 whiskers with different morphologies,such as branching and dendritic structure,can be obtained depending on the experimental conditions. With increasing PSMA concentration,the diameter of BaCO3 whiskers decreases.

关键词：碳酸钡晶须形态学单晶聚-(苯乙烯-交互-顺丁烯二酸) 实验条件

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