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Piezocatalytic performance of Fe_(2)O_(3)−Bi_(2)MoO_(6) catalyst for dye degradation

Frontiers of Chemical science and engineering 2023年第6期17卷 716-725页

作者： Lili Cheng Xiaoyao Yu Danyao Huang Hao Wang Ying Wu Key Laboratory of the Ministry of Education for Advanced Catalysis Materials School of Chemistry and Materials ScienceZhejiang Normal UniversityJinhua 321004China

A Fe_(2)O_(3)−Bi_(2)MoO_(6) heterojunction was synthesized via a hydrothermal *** electron microscopy,transmission electron microscopy,energy-dispersive X-ray,powder X-ray diffraction,Fourier transform infrared spectroscopy and ultra-violet−visible near-infrared spectrometry were performed to measure the structures,morphologies and optical properties of the as-prepared *** various factors that affected the piezocatalytic property of composite catalyst were *** highest rhodamine B degradation rate of 96.6%was attained on the 3% Fe_(2)O_(3)−Bi_(2)MoO_(6) composite catalyst under 60 min of ultrasonic *** good piezocatalytic activity was ascribed to the formation of a hierarchical flower-shaped microsphere structure and the heterostructure between Fe_(2)O_(3) and Bi_(2)MoO_(6),which effectively separated the ultrasound-induced electron–hole pairs and suppressed their ***,a potential piezoelectric catalytic dye degradation mechanism of the Fe_(2)O_(3)−Bi_(2)MoO_(6) catalyst was proposed based on the band potential and quenching effect of radical *** results demonstrated the potential of using Fe_(2)O_(3)−Bi_(2)MoO_(6) nanocomposites in piezocatalytic applications.

关键词： piezocatalysis Fe_(2)O_(3)−Bi_(2)MoO_(6) dye decomposition ultrasonic vibration

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Achieving exceptional strength and ductility combination in a heterostructured Mg-Y alloy with densely refined twins

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Journal of materials science & Technology 2024年第22期189卷 132-145页

作者： Yuliang Yang Yuxin Liu Shuang Jiang Ye Yuan Weiye Chen Lifang Sun Zhufeng He Xiaoli Zhao Nan Jia Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China School of Material Science and Engineering North Minzu UniversityYinchuan 750021China

Metals and alloys with heterogeneous microstructures are an emerging class of materials that exhibit exceptional mechanical properties,owing to the novel scientific principle of hetero-deformation induced(HDI)strengthening and *** magnesium alloys,due to their low recrystallization temperature,poor ductility at room temperature,limited cold workability,and the tendency to generate strong basal texture during deformation,it is difficult to obtain heterostructures without relying on precipitation of the second ***,three heterostructured Mg-2.9Y(wt.%)materials with varying accumulative equivalent true strains,i.e.,5%-5 cycles,7.5%-5 cycles,and 10%-5 cycles materials were fabricated via applying five complete triaxial compression cycles to the bulk *** 5%-5 cycles material with an accumulative equivalent true strain of 0.37 is featured with long twin lamellae embedded in coarse *** the accumulative true strain increases to 0.72,a heterogeneous structure composed of long and short twin lamellae is formed inside the 7.5%-5 cycles *** the equivalent true strain further increases to 1.01,the 10%-5 cycles material exhibits a mixed structure with densely refined twin lamellae embedded in the coarse-grained *** room-temperature uniaxial tensile tests show that the yield strength of the materials processed by triaxial cyclic compression(TCC)has been significantly improved compared to that at the initial state,whereas ductility was not significantly sacrificed without the subsequent heat *** dense and refined twin lamellae that serve as hard domains in this material provide a high density of interfaces and impede dislocation motion *** results in significant HDI strengthening and *** findings provide new insight into the design of heterostructured hexagonal close-packed materials with both high strength and good ductility.

关键词： Heterostructure Magnesium alloy Twin Hetero-deformation induced strengthening and hardening

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Wound microenvironment self-adaptive hydrogel with efficient angiogenesis for promoting diabetic wound healing

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Bioactive materials 2023年第2期20卷 561-573页

作者： Zijian Shao Tianyu Yin Jinbo Jiang Yang He Tao Xiang Shaobing Zhou Key Laboratory of Advanced Technologies of Materials Ministry of EducationSchool of Materials Science and EngineeringSouthwest Jiaotong UniversityChengdu610031PR China

Neovascularization is critical to improve the diabetic microenvironment,deliver abundant nutrients to the wound and promote wound ***,the excess of oxidative stress impedes the healing ***,a self-adaptive multifunctional hydrogel with self-healing property and injectability is fabricated through a boronic ester-based reaction between the phenylboronic acid groups of the 3-carboxyl-4-fluorophenylboronic acid-grafted quaternized chitosan and the hydroxyl groups of the polyvinyl alcohol,in which pro-angiogenic drug of desferrioxamine(DFO)is loaded in the form of gelatin microspheres(DFO@G).The boronic ester bonds of the hydrogel can self-adaptively react with hyperglycemic and hydrogen peroxide to alleviate oxidative stress and release DFO@G in the early phase of wound healing.A sustained release of DFO is then realized by responding to overexpressed matrix *** a full-thickness diabetic wound model,the DFO@G loaded hydrogel accelerates angiogenesis by upregulating expression of hypoxia-inducible factor-1 and angiogenic growth factors,resulting in collagen deposition and rapid wound *** multifunctional hydrogel can not only self-adaptively change the microenvironment to a pro-healing state by decreasing oxidative stress,but also respond to matrix metalloproteinases to release *** self-adaptive multifunctional hydrogel has a potential for treating diabetic wounds.

关键词： Wound microenvironment Self-adaptive hydrogel MMP-9 responsive Angiogenesis Diabetic wound healing

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engineering the interface of porous CoMoO_(3)nanosheets with Co_(3)Mo nanoparticles for high-performance electrochemical overall water splitting

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Journal of materials science & Technology 2023年第6期137卷 184-192页

作者： Haibin Ma Xuejing Yang Zhili Wang Qing Jiang Key Laboratory of Automobile Materials Ministry of Educationand School of Materials Science and EngineeringJilin UniversityChangchun 130022China

The design of high-performance electrocatalysts for alkaline water splitting is of significant importance for the development of a sustainable hydrogen ***,heterostructured Co_(3)Mo nanoparti-cles/porous CoMoO_(3)nanosheets(Co_(3)Mo/CoMoO_(3)NPSs)were constructed for alkaline water splitting by annealing CoMoO x nanosheets under controlled *** to its interfacial electronic structure and increased electrochemical active area,Co_(3)Mo/CoMoO_(3)NPSs exhibit impressive hydrogen evolution reaction(HER)activity with an overpotential of 334 mV at 1000 mA cm^(-2) and a Tafel slope of 46.4 mV per decade in 1.0 M KOH,which outperforms Pt/C catalyst(621 mV and 74.7 mV per decade).Density functional theory calculations illustrate the electron transfer from Co_(3)Mo to CoMoO_(3)at the interfaces,where electron accumulation on CoMoO_(3)favors the dissociation of H_(2)O molecule,and electron-deficient Co atoms in Co_(3)Mo have optimized H∗absorption energy for *** Co_(3)Mo/CoMoO_(3)NPSs also exhibit higher oxygen evolution reaction activity than the RuO_(2)***,the water electrolyzer us-ing Co_(3)Mo/CoMoO_(3)NPSs as both cathode and anode only requires 1.59 V to deliver a current density of 100 mA cm^(-2)in 1.0 M KOH,which outperforms benchmark Pt/C||RuO_(2)electrodes couple with 1.69 V to reach the same current density,providing great potential for large-scale applications.

关键词： interface engineering Heterostructures Interfacial electronic structure Hydrogen evolution reaction Overall water splitting

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Theoretical predictions on cluster radioactivity of superheavy nuclei with Z=119,120

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Chinese Physics C 2024年第1期48卷 125-137页

作者：刘洁洁王震张涵韬任中洲 School of Physics Science and Engineering Tongji UniversityShanghai 200092China Key Laboratory of Advanced Micro-Structure Materials Ministry of EducationShanghai 200092China

In this study,we investigate the cluster radioactivity(CR)of new superheavy elements with Z=119 and 120 based on two successful theoretical methods with modified parameters:the density-dependent cluster model(DDCM)and unified decay formula(UDF).First,we employ the DDCM and UDF to accurately reproduce the experimental half-lives of cluster emissions,which demonstrates the high reliability of our theoretical ***,we systematically predict the probable cluster modes of ^(293-311)119 and ^(293-302)120 as well as their corresponding decay energies and *** half-lives of cluster decay derived from the DDCM are consistent with those from the ***,our results reveal that the cluster emission of ^(8)Be,emitted from the Z=119 and 120 isotopic chains,exhibits the minimum half-life for cluster emission,and hence,^(8)Be emission is considered the most probable cluster decay ***,we explore the competition betweenαdecay and CR and find thatαdecay may be the dominant decay mode against ***,the good linear relationship between the decay energy and the number ofαparticles within the emitted cluster is extended to the range of superheavy nuclei(SHN).We anticipate that our theoretical predictions for CR will provide valuable references for the experimental synthesis of new SHN.

关键词： cluster radioactivity superheavy nuclei density-dependent cluster model

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Perspective about gasoline soot combustion over ceria catalysts:A close look into the"active oxygen"enigma

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Journal of Rare Earths 2025年第4期43卷 641-659,I0001页

作者： Zilin Tu Gongde Wu Changlong Zheng Xiaodong Wu Jie Wan Shuang Liu School of Materials Science and Engineering Ocean University of ChinaQingdao266100China Energy Research Institute Nanjing Institute of TechnologyNanjing211167China Key Laboratory of Advanced Materials of Ministry of Education of China School of Materials Science and EngineeringTsinghua UniversityBeijing100084China

Catalyzed gasoline particulate filters(cGPFs)are being developed to enable compliance with the particulate number limits for passenger cars equipped with gasoline direct injection(GDI)engines in China and Europe,It is appealing to build catalysts with ceria—an irreplaceable"reducible"component in three-way converters—to help eliminate the soot particles trapped in cGPFs via O_(2)-assisted *** research aiming at understanding how these recipes function has continued for more than two decades,a universal model elucidating the roles of different"active oxygen"species is yet to be *** this perspective,by critically assessing the reported data about gasoline soot catalytic combustion over ceria catalysts,it is suggested that ceria ignites soot through contributing its lattice oxygen,giving rise to a"hot ring"region at the periphery of soot-catalyst *** the"re-oxidation"semi-cycles,electrophilic superoxides and/or peroxides(O_(x)^(n-))are produced at the Ce^(3+)and oxygen vacancy sites enriched in this collar-like region,and then work as key reactive phases for soot deep *** on this"O_(x)^(n-)assisted"Mars-van Krevelen mechanism,several guidelines for ceria catalyst designing are proposed,ending with a summary about where future opportunities and challenges may lie in developing efficient and practical cGPF catalysts.

关键词： Gasoline particulate filter Soot combustion Ceria catalysts Rare earths Reaction mechanism Catalyst design

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Unique Duplex Microstructure and Porosity Effect on Mechanical Properties of AlCoCrFeNi_(2.1) Eutectic High-Entropy Alloys Processed by Selective Laser Melting

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Acta Metallurgica Sinica(English Letters) 2023年第9期36卷 1465-1481页

作者： Liwei Lan Wenxian Wang Zeqin Cui Xiaohu Hao College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan030024China Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyMinistry of EducationTaiyuan030024China Shanxi–Zhejiang University New Materials and Chemical Research Institute Taiyuan030032China

Selective laser melting(SLM)was performed on AlCoCrFeNi_(2.1) eutectic high-entropy alloys(EHEAs),and the unique duplex microstructure and porosity were investigated as well as the negative effect on mechanical *** printed AlCoCrFeNi_(2.1) EHEAs is composed of face-centered cubic and BCC/B2 phases,and the surface texture of samples perpendicular to and parallel to the building direction is *** the bottom of the molten pool to the inside,the structure changes from dendrites to columnar crystals and then to cellular crystals,the distribution of elements in and around the molten pool is uniform,and there is no element *** surface hardness of as-printed AlCoCrFeNi_(2.1) EHEAs is higher than that of as-cast ones due to the grain refinement strengthening,and there is anisotropy in different surface hardness,the highest hardness is 580 HV(X–Y plane)and 560 HV(X–Z plane).The reduction of bearing area and tip stress concentration caused by pores have adverse effects on the tensile strength and elongation of the alloy,the ultimate tensile strength increased from 1060 to 1289 MPa.

关键词： Selective laser melting Eutectic high-entropy alloys Metallurgical porosity Microstructure evolution Grains and interfaces

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Stabilized interfacial structure induced by self-dissolved active atoms in the (HfZrTiTaNb)C high-entropy carbide brazed joint using CoCrFeNi alloy

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Ceramics International 2025年第15期51卷 20006-20015页

作者： Mu, Ruijie Wang, Ying Niu, Shiyu Sun, Kongbo Yang, Zhenwen Tianjin Key Laboratory of Advanced Joining Technology School of Materials Science and Engineering Tianjin University Tianjin300350 China Key Laboratory of Advanced Ceramics and Machining Technology Ministry of Education Tianjin300350 China

Understanding reaction behavior of the high-entropy solid/liquid interface induced by multicomponent dissolution is critical for the construction of reliable brazed joints for high-temperature service. The brazed joint of (HfZrTiTaNb)C high-entropy carbide (HEC) bonded with a simple CoCrFeNi high-entropy alloy was investigated at 1440–1550 °C for 15–60 min. Under bonding temperatures, HEC grains dissociated into the liquid alloy, and the self-dissolved Zr atoms at the interface between the HEC grains and liquid alloy induced the formation of Zr-riched HEC phase (ZHEC) attached to HEC grains. The ZHEC phases were characterized by the increased Zr content to 21.44 at.% and the coherent orientation with the HEC. The CoCrFeNi alloy did not undergo phase separation after solidifying in the middle of the joint, resulting in a high-entropy interfacial structure, which remained stabilized in the joints over a wide range of process parameters. In addition, the shear strength and high-temperature performance of the joints were evaluated. A joint strength of 266 MPa could be obtained when brazed at 1460 °C for 45 min. At an test temperature of 1000 °C, the joint strength still retained 87 MPa, indicating its positive potential for high-temperature applications. Intergranular fracture of the CoCrFeNi under elevated temperatures was responsible for the decrease in joint strengths. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Cobalt alloys

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Effect of T6 Treatment on the Microstructure and Properties of Mg-Zn-Ce with Different Zn Contents 75

Effect of T6 Treatment on the Microstructure and Properties ...

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75th World Foundry Congress, WFC 2024

作者： Jiang, Aoxue You, Zhiyong Jin, Shuaishuai Sun, Chunle Wang, Kaiying Institute of Energy Innovation Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of Education College of Materials Science and Engineering Taiyuan University of Technology 030024 China

The alloy compositions and heat treatment processes of Mg-Zn-Ce were designed and formulated based on phase diagram calculations. Mg-5Zn-0.2Ce and Mg-7Zn-0.3Ce alloys with different Zn contents were prepared through rapid solidification and T6 treatment. The study showed that when the Zn content is less than its maximum solubility in Mg (6.2 wt.%), T6 heat treatment results in a coarse microstructure and the occurrence of secondary recrystallization. When the Zn content is greater than 6.2 wt.%, T6 heat treatment refines the grains and significantly improves the mechanical properties. However, T6 treatments will generally produce a large number of MgZn and Mg12Ce precipitates distributed within the MgZn-Ce alloy microstructure. These precipitates greatly enhance the comprehensive mechanical properties of the alloy. © 2024 75th World Foundry Congress, WFC 2024. All rights reserved.

关键词： Rapid solidification

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Numerical simulation of melt flow and temperature field during DC casting 2024 aluminium alloy under different casting conditions

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China Foundry 2024年第4期21卷 387-396页

作者： Jin-chuan Wang Yu-bo Zuo Qing-feng Zhu Jing Li Rui Wang Xu-dong Liu Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern UniversityShenyang 110819China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China Engineering Research Center of Advanced Materials Preparing Technology Ministry of EducationShenyang 110819China CAS Key Laboratory of Nuclear Materials and Safety Assessment Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

Casting speed,casting temperature and secondary cooling water flow rate are the main process parameters affecting the DC casting *** parameters significantly influence the flow and temperature fields during casting,which are crucial for the quality of the ingot and can determine the success or failure of the casting *** simulation,with the advantages of low cost,rapid execution,and visualized results,is an important method to study and optimize the DC casting *** the present work,a simulation model of DC casting 2024 aluminum alloy was established,and the reliability of the model was ***,the influence of casting parameters on flow field and temperature field was studied in detail by numerical simulation *** show that with the increase of casting speed,the melt flow becomes faster,the depths of slurry zone and mushy zone increase,and the variation of slurry zone depth is greater than that of mushy *** an increase in casting temperature,the melt flow rate increases,the depth of the slurry zone becomes shallower,and the depth of the mushy zone experiences only minor *** simulation results further indicate that the increase of the flow rate of the secondary cooling water slightly reduces the depths of both slurry and mushy zone.

关键词： aluminium DC casting flow field temperature field numerical simulation

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