检索结果-南通市图书馆

Science China Chemistry 2022年第1期65卷 7-19页

作者： Jiangyan wang zumin wang Dan Mao Dan wang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Hollow multishelled structure(HoMS)is one of the most promising multifunctional *** high complexity of its structure makes the general and controllable synthesis of HoMS rather *** integration of multidisciplinary knowledge,a great achievement in HoMSs has been obtained in the past ***,the developed sequential templating approach has significantly boomed the progress of HoMS in composition and structure diversity and application *** implementation of the temporal-spatial ordering in HoMS makes it indispensable in solving the key scientific problems in energy conversion,catalysis and drug delivery *** development in HoMSs with novel intricate structures will bring new *** this review,we systematically introduce the development history of HoMSs,summarize the inspiration inherited from the previous research on hollow structures,and discuss the milestones in the development of HoMSs,with a focus on the sequential templating approach for HoMS fabrication,attractive temporal-spatial ordering property and dynamic smart behavior for advanced *** hope to reveal the inherent relationship between the precise synthesis of HoMS and its highly tunable compositional and structural characteristics,and point out its future direction to boost HoMS area further.

关键词： hollow multishelled structure sequential templating approach temporal-spatial ordering smart dynamic behavior

Direct alloying of immiscible molybdenum-silver system and its thermodynamic mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第6期65卷 18-28页

作者： Jinlong Du Cai Li zumin wang Yuan Huang Institute of Advanced Metallic Materials School of Material Science and EngineeringTianjin UniversityTianjin 300072China

Direct alloying is difficult to be realized in an immiscible Mo-Ag system with a positive formation heat due to the absence of thermodynamic driving force at *** this work,a direct alloying method is developed to realize the direct alloying between Mo and Ag and construct Mo-Ag *** direct alloying method was mainly carried out through a direct diffusion bonding for Mo and Ag rods at a temperature close to the melting point of Ag(Tm Ag).Then the microstructure and phase constitution of the as-constructed Mo-Ag interface are *** results show that Mo-Ag metallurgical bonding interface has been constructed successfully,indicating that a direct alloying in the immiscible Mo-Ag system has been ***,mechanical tests are carried out for the Mo-Ag joints prepared through the direct alloying *** test results show that the average maximum tensile strength of the joints is about 107 *** effect of alloying parameters on the tensile strength is also discussed,which shows that there is an effective temperature range for the direct alloying between Mo and ***,an improved thermodynamic model that considers the formation of Mo-Ag crystalline and amorphous phase is presented to reveal the thermodynamic mechanism of the direct *** the calculation and differential scanning calorimetry(DSC)tests results,the Gibbs energy diagram for the direct alloying is *** is confirmed that the co-release of storage energy and surface energy can serve as the thermodynamic driving force to overcome the effect of positive formation heat and lead to direct alloying for Mo-Ag systems.

关键词： Direct alloying Immiscible Mo-Ag system Metallurgical bonding interface Thermodynamic driving force Joints

Oxidation of amorphous alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第11期34卷 1977-2005页

作者： Zhiqiang Xu Yifei Xu An Zhang Jiangyong wang zumin wang School of Materials Science and Engineering Tianjin University Department of Physics Shantou University

Owing to their unique short-or medium-range ordered microstructures and excellent mechanical, physical, and chemical properties, amorphous alloys have attracted significant interest in recent years. For the application of amorphous alloys, clarifying their oxidation processes and mechanisms is necessary since many of the surface-related properties of amorphous alloys largely depend on the surface oxide *** aim of this paper is to review the recent research on the thermal oxidation behaviors of amorphous alloys under pure oxygen or air condition. The contents are divided into three categories according to the number of components the research considers, i.e., the oxidation of binary, ternary, and multi-component（〉3） amorphous alloys. Each section discusses the thermal stability of the amorphous matrix, oxidation kinetics, and the oxide layer and amorphous substrate, which are strongly affected by internal factors（i.e., alloy elements and microstructure） and external factors（i.e., oxidation temperature, duration, and oxygen partial pressure, etc.）. The general features of the oxidation of amorphous alloys – from simple binary to complex multi-component amorphous alloys – will be summarized. This overview of the current scientific understanding on the fundamentals of these materials may provide guidelines for the development of strongly corrosion-resistant amorphous alloys.

关键词： Amorphous alloys Oxidation Oxidation kinetics Microstructure Surface treatment

Towards a Service-Oriented Architecture for a Mobile Assistive System with Real-time Environmental Sensing

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2016年第6期21卷 581-597页

作者： Darpan Triboan Liming Chen Feng Chen zumin wang the Context Intelligence and Interaction Research Group (CIIRG) De Montfort University the Department of Information Engineering Dalian University

With the growing aging population, age-related diseases have increased considerably over the *** response to these, Ambient Assistive Living（AAL） systems are being developed and are continually evolving to enrich and support independent living. While most researchers investigate robust Activity Recognition（AR）techniques, this paper focuses on some of the architectural challenges of the AAL systems. This work proposes a system architecture that fuses varying software design patterns and integrates readily available hardware devices to create Wireless Sensor Networks（WSNs） for real-time applications. The system architecture brings together the Service-Oriented Architecture（SOA）, semantic web technologies, and other methods to address some of the shortcomings of the preceding system implementations using off-the-shelf and open source components. In order to validate the proposed architecture, a prototype is developed and tested positively to recognize basic user activities in real time. The system provides a base that can be further extended in many areas of AAL systems,including composite AR.

关键词： Activities of Daily Living (ADL) Service-Oriented Architecture (SOA) semantic web ontology modeling Web Ontology Language (OWL) Activity Recognition (AR) Smart Homes (SH) Wireless Sensor Networks (WSNs)

Constructing BaTiO_(3)/TiO_(2)@polypyrrole composites with hollow multishelled structure for enhanced electromagnetic wave absorbing properties

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 581-590页

作者： Dan Mao Zhen Zhang Mei Yang zumin wang Ranbo Yu Dan wang State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Department of Energy Storage Science and Engineering School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijing 100083China University of Chinese Academy of Sciences Beijing 100049China

BaTiO_(3)/TiO_(2)@polypyrrole(PPy)composites with hollow multishelled structure(HoMS)were constructed to enhance the electromagnetic wave absorbing properties of BaTiO_(3)-based absorbing ***_(3)/TiO_(2)HoMSs were prepared by hydrothermal crystallization using TiO_(2)Ho MSs as ***,FeCl3 was introduced to initiate the oxidative polymerization of pyrrole monomer,forming BaTiO_(3)/TiO_(2)@PPy HoMSs *** electromagnetic wave absorbing properties of BaTiO_(3)/TiO_(2)HoMSs and BaTiO_(3)/TiO_(2)@PPy Ho MSs with different shell number were investigated using a vector network *** results indicate that BaTiO_(3)/TiO_(2)@PPy HoMSs exhibit improved microwave absorption compared with BaTiO_(3)/TiO_(2)*** particular,tripled-shelled BaTiO_(3)/TiO_(2)@PPy HoMS has the most excellent absorbing *** best reflection loss can reach up to-21.80 dB at 13.34 GHz with a corresponding absorber thickness of only 1.3 mm,and the qualified absorption bandwidth of tripled-shelled BaTiO_(3)/TiO_(2)@PPy HoMS is up to 4.2 *** work paves a new way for the development of high-performance composite microwave absorbing materials.

关键词： BaTiO_(3)/TiO_(2)@polypyrrole composites hollow multishelled structure electromagnetic wave absorbing

Microstructure-dependent oxidation behavior of Ni-Al single-crystal alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2020年第17期52卷 162-171页

作者： Jianlu Pei Yefan Li Chong Li zumin wang Yongchang Liu Huijun Li State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science&EngineeringTianjin UniversityTianjin 300354China School of Mechanical Materials and Mechatronic EngineeringUniversity of WollongongNew South Wales 2522Australia

The effect of theγ+γtwo-phase structure on the oxidation behaviors of Ni-Al single-crystal alloys at 650℃was investigated by scanning electron microscopy,transmission electron microscopy,atomic force microscopy,X-ray diffraction and Auger electron *** the initial oxidation stage,the oxidation behavior is primarily determined by the growth pattern of oxides in theγ*** outward convex NiO was formed in unprotected wideγ*** Ni-Al spinel oxide provides a great number of short-circuit paths,accelerating the inward diffusion of oxygen and outward diffusion of *** the late stage of oxidation,the elongated internal oxide in the largeγphase contributes to the diffusion of oxygen along the oxide/metal ***,the Ni-Al single-crystal alloy with wideγchannels and largeγprecipitates exhibited poor oxidation performance.

关键词： Ni-Al single-crystal alloys γ'Phase γPhase Oxidation behavior

Role of solute in stress development of nanocrystalline films during heating:An in situ synchrotron X-ray diffraction study

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第13期144卷 188-197页

作者： Jing wang Xiaohu Li Emad Maawad Lu Han Yuan Huang Yongchang Liu zumin wang State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300350China German Engineering Materials Centre at MIZ Helmholtz-Zentrum GeesthachtGarching D-85747Germany Helmholtz-Zentrum Geesthacht Institute of Materials PhysicsMax-Planck-Str.1Geesthacht D-21502Germany

The effect of the solute(Mo)on the stress development of nanocrystalline Ni and Ni-Mo films upon heat-ing has been investigated in real time using in situ synchrotron X-ray *** complex and distinct relationship between the film stress and grain boundaries(GBs)has been examined by the evolution of real-time intrinsic stress in combination with the in situ grain growth and thermal *** different intrinsic stress evolutions in the Ni and Ni-Mo films during the heating process result from the modification of GBs by Mo alloying,including GB amorphization,GB relaxation,and GB *** has been found that GBs play a vital role in the stress development of nanocrystalline *** addition of a solute can not only inhibit grain growth but also influence the stress evolution in the film by changing the atomic diffusivity at the *** work provides valuable and unique insights into the effect of solutes on stress development in nanocrystalline films during annealing,permitting control of the film stress through solute addition and heat treatment,which is critical for improving the design,processing,and lifetime of advanced nanocrystalline film devices at high temperatures.

关键词： Synchrotron X-ray diffraction Nanocrystalline film Solute Stress development Grain boundary

Supermodulus effect by grain-boundary wetting in nanostructured multilayers

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2021年第6期65卷 202-209页

作者： Jing wang Lu Han Xiaohu Li Dongguang Liu Laima Luo Yuan Huang Yongchang Liu zumin wang State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300350China German Engineering Materials Centre at MLZ Helmholtz-Zentrum GeestachtD-85747 GarchingGermany Institute of Industry and Equipment Technology Hefei University of TechnologyHefei 230009China School of Materials Science and Engineering Hefei University of TechnologyHefei 230009China

The effect of thermal treatments on mechanical properties was systematically investigated in Ni/Mo multilayers with a constant modulation period(160 nm)prepared by magnetron sputtering deposition.A supermodulus effect was found in the annealed multilayers as compared to the as-deposited state.A large tensile stress development was observed in the *** evolution of grain-boundary(GB)wetting was observed at the interfaces of the multilayers,which results in an enhanced modulus based on the mechanism of GB-wetting-induced interfacial stress/*** GB wetting phenomenon was further supported by a thermodynamic *** results not only bring clear evidence of the important role of interfacial structures in governing the elastic behavior of metallic multilayers,but also allow designing the multilayers with special properties through atomic diffusion and wetting at the interfaces based on the thermodynamic calculation.

关键词： Multilayer Elastic modulus Grain-boundary wetting Stress Thermodynamic calculation

Anomalous formation of micrometer-thick amorphous oxide surficial layers during high-temperature oxidation of ZrAl2

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第7期35卷 1479-1484页

作者： Zhangping Hu Yifei Xu Yuanyuan Chen Peter Schutzendube Jiangyong wang Yuan Huang Yongchang Liu zumin wang School of Materials Science and Engineering Tianjin UniversityTianjin300350China Max Planck Institute for Intelligent Systems Heisenbergstrasse 3D-70569StuttgartGermany Department of Physics Shantou UniversityShantou515063China

The thermal oxidation of ZrAl2 in the temperature range of 550–750℃ in pure oxygen has been investigated by a combinational experimental approach using X-ray diffraction, scanning electron microscopy/energy dispersive spectrometer, Auger electron spectroscopy and cross-sectional transmission electron microscopy. The thermal oxidation leads to the growth of anomalously thick(up to 4.5 μm)amorphous(Zr0.33 Al0.67)O1.66 surficial layers at temperatures as high as 750℃. The oxidation kinetics obeys a parabolic law with an activation energy of 143 kJ/mol. The underlying mechanism for the formation of such micrometer-thick amorphous oxide surficial layers has been discussed on the basis of interface thermodynamics and the occurrence of high interface stability associated with a synchronous oxidation of Al and Zr elements.

关键词： Thermal oxidation Zr-Al alloys Amorphous oxides Oxidation kinetics Interface thermodynamics

Boosting the Activity and Stability of the Photoreduction of Diluted CO_(2) by Copper Oxide Decorated CeO_(2) Hetero-shells

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2024年第3期40卷 513-520页

作者： XIAO Mingjiao LI Di WEI Yanze HE Yilei wang zumin YU Ranbo Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversity of Science&Technology BejingBeijing 100083P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Key Laboratory of Biopharmaceutical Preparation and Delivery Chinese Academy of SciencesBeijing 100190P.R.China

Inspired by the natural photosynthesis systems,the integrated harnessing and conversion of CO_(2) present a promising solution for addressing the ever-rising global atmospheric concentration of CO_(2).Hollow multi-shelled structured(HoMS)photocatalysts,featuring alternating shells and cavities,have recently gained recognition as efficient nano-reactors for capturing CO_(2) molecules and facilitating effective photoreduction within these hierarchical structures,leveraging the preeminent enrichment *** this work,to augment the photocatalytic efficacy of HoMS in CO_(2) treatment,highly dispersed Cu_(x)O nanoparticles(NPs)were incorporated on the CeO2 shells through a polymer-assisted impregnation method to create more active sites and strengthen the interaction between the hetero-shells and CO_(2) *** photoreduction of the CO_(2)-to-CO rate under a diluted CO_(2)(15%,volume fraction)atmosphere is improved by the introduction of Cu_(x)O NPs,with the highest CO yielding rate reaching 120µmol·h^(−1)·g^(−1) without any sacrificial *** comparison experiments and theoretical calculations reveal that the Cu_(x)O NPs promote the adsorption of CO_(2) molecules in HoMS,accelerate the charge transfer efficiency,and stabilize the surface oxygen vacancies(Ovs)during the photoreduction CO_(2) conversion *** hope these easy-to-prepare HoMS nanoreactors can contribute to the effective enrichment and valorization of CO_(2) in industrial exhaust gases.

关键词： Photoreduction CO_(2) Cu_(x)O/CeO_(2)hollow multi-shell structure(HoMS) Hetero-shell