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

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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

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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

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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

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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

Ti-MOF Derived N-Doped TiO2 Nanostructure as Visible-light-driven Photocatalyst

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Chemical Research in Chinese Universities 2020年第3期36卷 447-452页

作者： HE Yilei ZHANG Xing WEI Yanze CHEN Xiaoyu wang zumin YU Ranbo Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversiw of Science and Technology BeijingBeijing 100083P.R.China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China Key Laboratory of Advanced Material Processing&Mold Ministry of EducationZhengzhou UniversityZhengzhou 450002P.R.China

Nanostructured N-doped TiO2 photocatalyst has been prepared via a new approach from Ti-based MOF[NH2-MIL-125(Ti)]*** success of N doping enhances light absorption and narrows the ***,the as-prepared nanostructure is constructed with tiny nanoparticles and resembles a pie-like morphology inherited from the MOF,which accelerates electron ***,as a photocatalyst for the degradation of methylene blue(MB)under visible light irradiation,the N-doped TiO2(N-TiO2)nanostructure shows higher photocatalytic activity with a reaction rate constant of 0.018min^-1 than that of the TiO2-P25 and TiO2 under the visible light.

关键词： TiO2 Mctal-organic framcwork Photo-degradaton N doped Visible-light photocatalysis

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

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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

Cobalt hollow nanospheres： controlled synthesis, modification and highly catalytic performance for hydrolysis of ammonia borane

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Science Bulletin 2017年第5期62卷 326-331页

作者： wangya Wei zumin wang Jie xu Lingbo Zong Kun Zhao Hao wang Haiyan Li Ranbo Yu Department of Physical Chemistry School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Centre for Future Materials University of Southern Queensland Toowoomba Queensland 4350 Australia Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and Architecture Beijing 100044 China

Size tunable cobalt hollow nanospheres with high catalytic activity for the ammonia borane(AB) hydrolysis have been synthesized by using the solvothermal method. The complexation between Co2+and ethylenediamine is observed to be critical for the formation of the cobalt hollow nanospherical *** morphology of the cobalt hollow nanospheres can be regulated by adjusting the original ethylenediamine/ethanol volume ratio, reaction time and temperature. Impressively, the magnetic property study reveals that the coercivity of the as-synthesized cobalt hollow nanospheres is much enhanced compared with that of bulk cobalt materials. Meanwhile, Co/Pt bimetal hollow nanospheres(Co Pt HS) and graphene-cobalt hollow composite nanospheres(Co HS-r GO) have also been explored. In comparison with the cobalt hollow nanospheres, both the Co Pt HS and Co HS-r GO show higher catalytic activities and better repeatability for the catalytic hydrogen generation from AB hydrolysis. Moreover, it is noted that these catalysts could be recycled by using the magnetic separation method.

关键词： Cobalt hollow nanospheres Controlled synthesis Modification Catalysis Hydrolysis

Microstructure evolution and interface structure of Al-40 wt% Si composites produced by high-energy ball milling

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Journal of Materials Science & Technology 2019年第4期35卷 512-519页

作者： Yuanyuan Chen Zhangping Hu Yifei Xu Jiangyong wang Peter Schützendübe Yuan Huang Yongchang Liu zumin wang School of Materials Science and Engineering Tianjin University Department of Physics Shantou University Max Planck Institute for Intelligent Systems

High silicon content Al-Si composites with a composition of Al-40 wt% Si were fabricated via a highenergy ball milling method. The microstructure evolution of Al-40 wt% Si milled powders and sintered composites has been thoroughly studied by scanning electron microscopy, X-ray diffraction, energydispersive spectrometry and high-resolution transmission electron microscopy. The mechanism of ball milling Al-40 wt% Si powders has been disclosed in detail: fracture mechanism dominating in the early stages, followed by the agglomeration mechanism, finally reaching the balance between the fragments and the agglomerates. It has been found that the average particle sizes of mixed Al-Si powders can be refined to the nanoscale, and the crystallite sizes of Al and Si have been reduced to 10nm and 62nm upon milling for 2h–50h, respectively. The finally formed Al-Si interfaces after ball milling for 50h are wellcohesive. A dense and homogenous Al-40 wt% Si composite have been achieved by solid-state sintering at550?C. The results thus provide an effective support for producing bulk nanostructured Al-Si composites.

关键词： Al-Si composites Interface structure High-energy ball milling Nanocrystalline powders

Facile Synthesis of Fe-based MOFs(Fe-BTC) as Efficient Adsorbent for Water Purifications

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Chemical Research in Chinese Universities 2019年第4期35卷 564-569页

作者： HAN Qian wang zumin CHEN Xiaoyu JIAO Chuangwei LI Haiyan YU Ranbo Department of Physical Chemistry School of Metallurgical and Ecological EngineeringUniversityf of Science and TechnologyBeijingBeijing 100083P.R.China School of Environment and Energy Engineering Beijing University of Civil Engineering and ArchitectureBeijing 100044P.R.China Key Laboratory of Material Processing and Mold Ministry of EducationZhengzhou UniversityZhengzhou 450001P.R.China

Fe-based metal-organic frameworks(Fe-BTC) were successfully synthesized in a large scale by using a simple one-pot method at room temperature. To understand its composition, texture and morphology, the as-synthesized material was analyzed systematically. Moreover, based on the adsorption property for anionic organic dyes(methyl orange, Congo red), cationic organic dves(methylene blue, rhodamine B) and heavy metal ions(Pb^2+) in aqueous solutions, it was revealed that the obtained Fe-BTC showed excellent capacities and adsorption rates tor different adsorbates. Besides the general adsorption eftect derived from the numerous pores and large specific surface area, the electrostatic forces and Л-Л interactions between benzene rings are believed to play significant roles in the large uptakes of this Fe-BTC sample. And the existence of mesopores in Fe-BTC might accelerate the adsorption.

关键词： One-pot synthesis Metal-organic framework Water purification Adsorption