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Structure and luminescence properties of color-tunable phosphor Sr_(2)La_(3)(SiO_(4))_(3)F:Tb^(3+),Sm^(3+)

Journal of Rare Earths 2023年第9期41卷 1288-1294,I0001页

作者： Haikun Liu Kun Nie Yuanyuan Zhang Lefu Mei Dina V.Deyneko Xiaoxue Ma Department of Energy and Chemical Engineering Dongguan University of TechnologyDongguan 523808China State Key Laboratory of New Textile Materials&Advanced Processing Technology and Hubei Key Laboratory for New Textile Materials and Applications School of Materials Science and EngineeringKey Laboratory of Polyphenylene Sulfide Fiber and Application in Textile IndustryWuhan Textile UniversityWuhan430200China Beijing Key Laboratory of Materials Utilization of Nonmetallic Minerals and Solid Wastes National Laboratory of Mineral MaterialsSchool of Materials Sciences and TechnologyChina University of GeosciencesBeijing 100083China School of Materials Sciences and Technology Dongguan University of TechnologyDongguan 523808China School of Materials Science and Engineering Xi'an Jiaotong UniversityXi'an 710049China Department of Chemistry Lomonosov Moscow State UniversityMoscow 119991Russia Laboratory of Arctic Mineralogy and Material Sciences Kola Science CentreRussian Academy of Sciences14 Fersman Str.184209ApatityRussia

A series of single-phase and color-tunable phosphors Sr_(2)La_(3)(SiO_(4))_(3)F:0.15Tb^(3+),xSm^(3+)(SLSOF:0.15Tb^(3+),xSm^(3+)) was prepared using solid-state *** X-ray diffraction(XRD) was used to characterize the phase of the as-prepared *** synthesized phosphors have apatite-type structure without other ***^(3+) and Tb^(3+) ions substitute La^(3+) into the lattice and form a single-phase solid *** elements are evenly distributed in the sample according to the scanning electron microscopy(SEM) *** crystal structure of the host phosphor was refined by the Rietveld *** optical properties were studied in detail by investigation of the luminescence and diffuse spectra,fluorescence decay curves and energy transfer *** phosphor color can be changed from green(0.29,0.48) to yellow/orange and red(0.57,0.42) via adjusting the doping ratio of Sm^(3+).The SLSOF:0.15Tb^(3+),xSm^(3+)phosphors can emit typical multicolor light such as green,yellow,orange and red with gradually increasing Sm^(3+)doping *** results indicate the occurrence of the energy transfer which results in the color-tunable properties of the phosphors.

关键词： Apatite Calcination Phosphor Optical property Luminescence Rare earths

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An atomic insight into effect of grain boundary on diffusion behavior of Cu/Al dissimilar materials undergoing ultrasonic welding

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Journal of Iron and Steel Research International 2024年第10期31卷 2555-2567页

作者： Jing-wei Yang Chu-hao Xie Jie Zhang Zong-ye Ding Jian Qiao School of Mechatronic Engineering and Automation Foshan UniversityFoshan528225GuangdongChina School of Mechanical Engineering University of Science and Technology BeijingBeijing100083China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China State Key Laboratory of Advanced Brazing Filler Metals&Technology Zhengzhou Research Institute of Mechanical Engineering Co.Ltd.Zhengzhou450001HenanChina

The diffusion processes in bicrystalline Cu/Al joints,characterized by typical high-angle grain boundaries(GBs),were investigated using molecular dynamics *** was found that GBs facilitated the diffusion of both Cu and Al atoms,predominantly enhancing the migration of Cu atoms into Al *** to mean squared displacement results,the movement of Al atoms within Al matrix was more vigorous than that of Cu *** mechanisms of atomic rearrangement,dislocation movement,stacking fault formation,and dynamic recrystallization were *** the compression and initial welding stages,the mismatch in lattice constants and the twisting of grains initiated a squeeze-induced rearrangement of Al atoms at the interface,leading to the formation of dislocations and *** the advanced stages of welding,the plastic deformation primarily occurred within Al matrix,marked by the emergence of dislocations,stacking faults,and GB ***,the shearing effect during the ultrasonic welding process,combined with GB sliding,collectively induced grain recrystallization at the ***,the diffusion between Cu/Al joints could be enhanced by increasing the vibration frequency,due to a significant rise in the number of amorphous regions.

关键词： Grain boundary Molecular dynamics Diffusion behavior Ultrasonic welding Dissimilar material

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Bismuth stabilized by ZIF derivatives for electrochemical ammonia production:Proton donation effect of phosphorus dopants

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Nano Research 2023年第4期16卷 4574-4581页

作者： Qiaoling Wu Ying Sun Qin Zhao Hui Li Zhengnan Ju Yu Wang Xiaodong Sun Baohua Jia Jieshan Qiu Tianyi Ma Institute of Clean Energy Chemistry Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials of Liaoning ProvinceCollege of ChemistryLiaoning UniversityShenyang 110036China School of Science RMIT UniversityMelbourneVIC 3000Australia College of Chemical Engineering State Key Laboratory of Chemical Resource EngineeringBeijing University of Chemical TechnologyBeijing 100029China

N2 electroreduction reaction(NRR)offers a feasible and promising alternative for NH_(3)production by using clean energy ***,it is still obstructed by the pretty low NH3 yield rate and Faradaic efficiency(FE)primarily due to the undesired competing hydrogen evolution reaction and the extremely stable N≡N ***,bismuth nanoparticles were successfully embedded in N and P co-doped carbon nanoflakes(Bi/NPC)by high-temperature pyrolyzation of Bi-zeolitic imidazole frameworks(ZIF)followed by phosphorization,and used as a high-efficiency catalyst toward N2 electroreduction to *** 0.1 M KHCO_(3)electrolyte,Bi/NPC exhibits excellent NRR performances,including a high NH3 yield rate of 3.12μg·h^(−1)·cm^(−2)(−0.6 V *** hydrogen electrode(RHE)),an outstanding FE of 13.58%(−0.4 V ***),and a remarkable stability up to 36 h under ambient *** outstanding NRR catalytic activity is mainly attributed to the intrinsic electrocatalytic NRR activity combined with the inert hydrogen evolution reaction(HER)activity of Bi,the adsorption and activation of N2 facilitated by N dopants,as well as the superior conductivity and the large specific surface area of the two-dimensional layered carbon ***,the hydrogen source provided by P dopant promotes the hydrogenation of the adsorbed N,which further boosts the NRR performance in alkaline *** ultralong durability of Bi/NPC is attributed to the highly dispersed bismuth catalytic active centers confined in the skeleton of N and P co-doped carbon nanoflakes,which inhibits the agglomeration of bismuth *** work presents a novel avenue for designation and fabrication of high-performance Bi-based electrocatalysts for NRR.

关键词： N2 reduction bismuth N P co-doped carbon nanoflakes electrocatalysis

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Novel experimental strategy towards temperature inhomogeneity during spark plasma sintering of metallic glasses

Advanced Powder Materials

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advanced Powder materials 2023年第3期2卷 1-10页

作者： Huaping Ding Xiaoqian Bao Mao Zhang Junsong Jin Lei Deng Kefu Yao Atefeh Solouk Pan Gong Xinyun Wang State Key Laboratory of Materials Processing and Die&Mould Technology School of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing30 Xue Yuan RoadBeijing 100083China School of Materials Science and Engineering Tsinghua UniversityBeijing 100084China Biomedical Engineering Department Amirkabir University of Technology(Tehran Polytechnic)TehranIran

Despite the importance of temperature distribution in spark plasma sintering of metallic glasses,its quantiﬁcation has been experimentally *** work proposes an experimental strategy to determine the sintering temperature by establishing a quantitative relationship between the temperature-thermal *** reproduced the thermal proﬁles of spark plasma sintering by isothermal annealing and found a correlation between annealing temperature and isothermal crystallization *** strong correlation indicates the temperature-dependent structural evolution of glassy *** isothermal crystallization time as the measuring gauge,we correlated the annealing temperature to the sintering temperature and obtained the sample temperature *** sample temperature is at least 19C higher than the nominal temperature of 425C measured by the ***,the sample temperature shows a hump-shaped pattern closely correlated with the current *** maximum temperature of 453C occurs on the sample/punches contact *** heterogeneity within the sample induces diverse microstructures and porous *** elucidate that the temperature inhomogeneity is intrinsic,given the presence of contact *** resistances affect the current distribution and heat transfer,resulting in a larger temperature gradient than the traditional powder metallurgy process.

关键词： Metallic glass Spark plasma sintering Temperature inhomogeneity Isothermal crystallization time Current distribution

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Flexible coatings with microphase separation structure attained by copolymers and ultra-fine nanoparticles for endurable antifouling

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Journal of materials Science & technology 2021年第23期82卷 179-186页

作者： Zhuo Chen Shun Chen Yufei Xiong Yuping Yang Yang Zhang Lijie Dong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Center for Smart Materials and DevicesWuhan University of TechnologyWuhan430070China School of Civil Engineering Architecture and EnvironmentHubei University of TechnologyWuhan430068China

Incorporating antibacterial agent into biomimetic coating inspired by natural organisms with micronano structure surface has generated more interest for antifouling *** this work,poly(dimethylsiloxane)(PDMS)-based triblock copolymers and sub-20 nm nanoparticles Ag and heterogeneous Fe_(3)O_(4)-coated Ag(Fe_(3)O_(4)@Ag)were used to construct microphase separation topography with oriented copolymer blocks *** artificial surface was verified by atomic force microscopy and scanning electron microscopy ***,the surface exhibited relative stable hydrophobic property,which was demonstrated by the water contact angle and dynamic air-bubble contact angle ***,after immersed in BSA solution 24 h and 720 h,the actual BSA absorption amount of the surface with Fe_(3)O_(4)@Ag nanoparticles was as low as 10%and 27%that of the initial BSA amount,***,the surface also showed remarkable antibacterial performance,which effectively suppressed the growth rate of Escherichia *** strategy of constructing the flexible micro p hase separation structure by introducing heterogeneous inorganic antibacterial nanoparticles into a block copolymer substrate opens up a new way to create an antifouling surface coating.

关键词： Microphase separation topography Ultra-fine nanoparticles Antifouling surfaces Antibacterial performance

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Joining of dissimilar metals between magnesium AZ31B and aluminum A6061-T6 using galvanized steel as a transition joining layer

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Journal of Iron and Steel Research International 2022年第4期29卷 677-686页

作者： Wei Li Jing-huan Chang Bao-feng Wen Rui Cao State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of TechnologyLanzhou 730050GansuChina Department of Materials Science and Engineering Lanzhou University of TechnologyLanzhou 730050GansuChina

A galvanized steel is used to join Mg AZ31B alloy and Al A6061-T6 alloy as a joining transition layer by cold metal transfer(CMT)***,to optimize the process variables,extensive welding tests were performed by a design of experiment ***,microstructures,joining mechanisms and tensile properties were characterized and *** indicated that Mg and Al alloys can be joined by using galvanized steel as a joining transition layer and cold metal transfer welding *** formed joint is called as a Mg–steel–Al CMT *** using galvanized steel transition joining layer,Mg–Al brittle intermetallics Al12Mg17 and Al3Mg2 were *** properties of Mg–steel–Al CMT joints have been improved after optimizing the welding *** strength of Mg–steel–Al CMT joint is comparable to those of Al–Al joint and Mg–Mg *** strength of Mg–steel–Al CMT joint can reach 100%that of Al–Al joint and Al–steel joint,and reach 90%that of Mg–Mg joint and Mg–steel *** optimized Mg–steel–Al CMT welded joint with galvanized steel transition layer is fractured at the heat affected zone of Al base metal rather than at the weld-brazed interface,due to softening of Al base metal.

关键词： Cold metal transfer Mg alloy Al alloy Galvanized steel Transition joining layer Dissimilar metal joining

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Ductile and high strength Cu fabricated by solid-state cold spray additive manufacturing

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Journal of materials Science & technology 2023年第3期134卷 234-243页

作者： Chaoyue Chen Yingchun Xie Shuo Yin Wenya Li Xiaotao Luo Xinliang Xie Ruixin Zhao Chunming Deng Jiang Wang Hanlin Liao Min Liu Zhongming Ren State Key Laboratory of Advanced Special Steels School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Institute of New Materials Guangdong Academy of SciencesNational Engineering Laboratory of Modern Materials Surface Engineering TechnologyGuangdong Provincial Key Laboratory of Modern Surface Engineering TechnologyGuangzhou 510651China Trinity College Dublin The University of DublinDepartment of Mechanical and Manufacturing EngineeringParsons BuildingDublin 2Ireland State Key Laboratory of Solidification Processing Shaanxi Key Laboratory of Friction Welding TechnologiesSchool of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China State Key Laboratory for Mechanical Behavior of Materials School of Materials Science and EngineeringXi’an Jiaotong UniversityXi’an 710049China Key laboratory for Light-weight Materials Nanjing Techchnology UniversityNanjing 211816China ICB UMR 6303 CNRSUniv.Bourgogne Franche-ComtéUTBMF-90010 BelfortFrance

In this work,pure Cu with excellent strength and ductility(UTS of 271 MPa,elongation to fracture of 43.5%,uniform elongation of 30%)was prepared using cold spray additive manufacturing(CSAM),realizing a breakthrough in the *** in-depth investigation was conducted to reveal the microstructure evolution,strengthening and ductilization mechanisms of the CSAM Cu,as well as the single *** results show that the CSAM Cu possesses a unique heterogeneous microstructure with a bimodal grain structure and extensive infinitely circulating ring-mounted distribution of *** on the single splat observation,the entire copper particle forms a gradient nano-grained(GNG)structure after high-speed impact *** GNG-structured single splat serves as a unit to build the heterogeneous microstructure with bimodal grain distribution during the successive deposition in *** results also show that CSAM can achieve synergistic strengthening and ductilization by controlling the grain refinement and dislocation *** work provides potential for CSAM technique in manufacturing various metallic parts with the desired combination of high strength and good ductility without additional post-treatments.

关键词： Cold spray additive manufacturing Copper Heterogeneous microstructure Strength Ductility

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synthesis of hierarchical SAPO-11-based catalysts with Al-based metal-organic framework derivative as mesoporogen to improve n-decane branched isomerization

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Petroleum Science 2022年第6期19卷 3171-3181页

作者： Xue-Man Wang Cheng-Long Wen Yu Fan State Key Laboratory of Heavy Oil Processing China University of PetroleumBeijing102249China Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Centerand School of Petrochemical EngineeringChangzhou UniversityChangzhouJiangsu213164China

Hierarchical SAPO-11 molecular sieve(ACS-11) was successfully synthesized employing the Al2O3/carbon(Al_(2)O_(3)/C) composite obtained through the pyrolysis of Al-based metal-organic framework(Al-MOF-96)as *** other carbon-based mesoporogens with strong hydrophobicity,the Al_(2)O_(3)/C interacts with phosphoric acid and generates the AlPO_(4)/C structure,which promotes the Al2O3/C dispersion in the synthesis gel of SAPO-11 and avoids the phase separation between *** Al_(2)O_(3)/C as mesoporogen decreases the crystallite size of SAPO-11 via preventing the aggregation of ***,the addition of Al_(2)O_(3)/C improves the Si distribution in the ACS-11 ***,ACS-11 has smaller crystallites,more mesopores,and a greater amount of medium Bronsted acid centers than the conventional microporous SAPO-11 and the SAPO-11 synthesized using activated carbon as *** corresponding Pt/ACS-11 catalyst exhibits the maximal selectivity to multi-branched C10isomers(23.28%) and the minimal cracking selectivity(15.83%) in n-decane hydroisomerization among these *** research provides a new approach for preparing hierarchical silicoaluminophosphate molecular sieve-based catalysts to produce high-quality fuels.

关键词： Hierarchical SAPO-11 Al_(2)O_(3)/C composite Hydroisomerization Branched isomers

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Deformation Evolution and Perceptual Prediction for Additive Manufacturing of Lightweight Composite Driven by Hybrid Digital Twins

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Chinese Journal of Mechanical Engineering 2024年第5期37卷 94-112页

作者： Jinghua Xu Linxuan Wang Mingyu Gao Chen Jia Qianyong Chen Kang Wang Shuyou Zhang Jianrong Tan Shaomei Fei State Key Lab of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310058China Zhejiang Key Lab of Advanced Manufacturing Technology School of Mechanical EngineeringZhejiang UniversityHangzhou 310058China State Key Laboratory of Materials Processing and Die and Mould Technology Huazhong University of Science and TechnologyWuhan 430074China Institute of Design Engineering Zhejiang UniversityHangzhou 310058China School of Mechanical and Aerospace Engineering Nanyang Technological UniversitySingapore City 639798Singapore

This paper proposes a deformation evolution and perceptual prediction methodology for additive manufacturing of lightweight composite driven by hybrid digital twins(HDT).In order to improve manufacturing quality of irregular lightweight composite through boosting conceptual design in aeronautic and aerospace engineering,the HDT meaning hybridization of physical and digital domains,including deformation and energy efficiency can be built,where the essential parameters can be perceptually predicted in advance,by virtue of the fusion of physical sensors and digital *** long short term memory(LSTM)can be employed to void vanishing gradient problem and improve predicting precision via Recurrent Neural Networks,thereby laying a foundation for the *** diverse manufacturing requirements of different regions are integrated into the parameters designing phase by attaching region weights confirmed via empiricism and in-service *** effects of slicing strategy and external support structures on manufacturing quality are considered from the perspective of improving dimensional *** manufacturing efficiency and comprehensive costs are accounted as consideration factors,which are perceptually predicted via *** designed manufacturing parameters through HDT were virtually examined by evaluating the deformation and equivalent stress distributions of fabricated lightweight component with composite material through AM process *** physical experiments were conducted to verify the HDT-based pre-designing and optimization method of manufacturing parameters via fused deposition modeling(FDM).The energy consumption of actual manufacturing process was measured via digital power meter and applied to evaluate accuracy of perceptual prediction *** dimensional accuracy and distortion distribution of the manufactured lightweight prototype made with composite material were measured through the coordinate measuring machine(CMM)and 3D optica

关键词： Deformation evolution Perceptual prediction Lightweight composite Hybrid digital twins(HDT) Long short term memory(LSTM)

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Persistence of charge density wave against variation of band structures in V_(x)Ti_(1−x)Se_(2)(x=0–0.1)

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Nano Research 2024年第3期17卷 2129-2135页

作者： Zhanfeng Liu Tongrui Li Wen Zhu Hongwei Shou Mukhtar Lawan Adam Qilong Cui Yuliang Li Sheng Wang Yunbo Wu Hongen Zhu Yi Liu Shuangming Chen Xiaojun Wu Shengtao Cui Li Song Zhe Sun National Synchrotron Radiation Laboratory CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230029China CAS Key Laboratory of Strongly-coupled Quantum Matter Physics University of Science and Technology of ChinaHefei 230026China Collaborative Innovation Center of Advanced Microstructures Nanjing 210093China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China School of Chemistry and Materials Sciences CAS Key Laboratory of Materials for Energy Conversionand CAS Center for Excellence in NanoscienceUniversity of Science and Technology of ChinaHefei 230026China School Zhejiang Institute of Photonelectronics Jinhua 321004China

Charge density wave(CDW)is a phenomenon that occurs in materials,accompanied by changes in their intrinsic electronic *** study of CDW and its modulation in materials holds tremendous significance in materials research,as it provides a unique approach to controlling the electronic properties of ***_(2) is a typical layered material with a CDW phase at low *** V substitution for Ti in TiSe_(2),we tuned the carrier concentration in V_(x)Ti_(1-x)Se_(2) to study how its electronic structures ***-resolved photoemission spectroscopy(ARPES)shows that the band-folding effect is sustained with the doping level up to 10%,indicating the persistence of the CDW phase,even though the band structure is strikingly different from that of the parent compound TiSe_(2).Though CDW can induce the band fold effect with a driving force from the perspective of electronic systems,our studies suggest that this behavior could be maintained by lattice distortion of the CDW phase,even if band structures deviate from the electron-driven CDW *** work provides a constraint for understanding the CDW mechanism in TiSe_(2),and highlights the role of lattice distortion in the band-folding effect.

关键词： charge density wave band structure lattice distortion

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