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Vacuum brazing TiAl intermetallic to K4169 alloy using amorphous filler metals Ti_(56.25–x)Zr_(x)Ni_(25)Cu1_(8.75)

Journal of Materials Science & Technology 2023年第23期154卷 217-231页

作者： Liangliang Zhang Honggang Dong Peng Li Shuai Li Baosheng wu Yueting Ma Libing huang Chao Li Jiachen Li Yuesen Yang School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China School of Mechanical Engineering North China University of Water Resources and Electric Power Zhengzhou 450045 China

A series of Ti_(56.25-x)Zr_(x)Ni_(25)Cu1_(8.75)(x=0–25,at.%) filler metals were designed based on a cluster-plus-glue-atom model to vacuum braze TiAl intermetallic to K4169 alloy. The impact of Zr content on the interfacial microstructure and shear strength of joints was examined. And the relationship between the interfacial lattice structure and the fracture behavior of the joint was investigated. The findings reveal a sectionalized characteristic with three reaction zones (Zone I, Zone II and Zone III) in the microstructure of the TiAl intermetallic to K4169 alloy joint. As the Zr content in filler metals increased, the diffusion of Ti transitioned from long-distance to short-distance in Zone I, changing the initial composition from TiNi_(3) /TiNi/NiNb/(Cr, Fe, Ni)SS to NiCrFe/(Cr, Fe, Ni)SS /TiNi. In Zone II, the initial composition altered from TiNi_(3) /TiNi to TiNi/Ti_(2) Ni/TiNi_(3) /TiCu/TiNi. The interface between Zones II and III altered from a non-coherent and semi-coherent interface of TiNi/TiAl/Ti_(3) Al with significant residual stress to a semi-coherent interface of TiNi/TiNi_(3) /TiAl_(2) /Ti_(3) Al with a gradient distribution. The shear strength of the joint initially decreased and then increased. When the Zr content of filler metal was 25 at.%, the shear strength of the joint reached 288 MPa. The crack initiation position changed from non-coherent TiNi/TiAl interface with high angle grain boundaries (HAGBs) and lattice mismatch of 65.86 at.% to a semi-coherent Ti3 Al/TiAl2 interface with a lattice mismatch of 20.07 at.% when the Zr content increased. The brittle fracture was present on the fracture surfaces of all brazed joints.

关键词： Vacuum brazing TiAl intermetallic to K4169 alloy brazed joint Ti-Ni based amorphous filler metal EBSD Lattice mismatch

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Computational Design of Single Mo Atom Anchored Defective Boron Phosphide Monolayer as a High-performance Electrocatalyst for the Nitrogen Reduction Reaction

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Energy & Environmental Materials 2021年第2期4卷 255-262页

作者： Zaichun Liu Ting huang Huhu Chang Faxing Wang Juan Wen Haodong Sun Masud Hossain Qingji Xie Yan Zhao Yuping wu State Key Laboratory of Materials-Oriented Chemical Engineering School of Energy Science and Engineering&Institute of Advanced MaterialsNanjing Tech UniversityNanjing 211816Jiangsu ProvinceChina State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China Key Laboratory of Chemical Biology&Traditional Chinese Medicine Research(Ministry of Education of China) College of Chemistry and Chemical EngineeringHunan Normal UniversityChangsha 410081HunanChina Department of Chemistry and Food Chemistry&Center for Advancing Electronics Dresden(cfaed) Technische Universit¨at DresdenDresden 01062Germany

Catalytic reduction of molecular dinitrogen(N_(2))to ammonia(NH_(3))is one of the most important and challenging industrial *** reduction is considered as an energy-saving technology for artificial ambient nitrogen fixation,which is emerging as an optimal potential sustainable strategy to substitute for the Haber–Bosch ***,this process demands efficient catalysts for the N_(2)reduction reaction(NRR).Here,by means of first-principles calculations,we systematically explored the potential electrocatalytic performance of single transition metal atoms(Pd,Ag,Rh,Cu,Ti,Mo,Mn,Zn,Fe,Co,Ru,and Pt)embedded in monolayer defective boron phosphide(TMs/BP)monolayer with a phosphorus monovacancy for ambient NH_(3)*** them,the Mo/BP exhibits the best catalytic performance for ambient reduction of N_(2)through the typical enzymatic and consecutive reaction pathways with an activation barrier of 0.68 e V,indicating that Mo/BP is an efficient catalyst for N_(2)*** believe that this work could provide a new avenue of ambient NH_(3)synthesis by using the designed single-atom electrocatalysts.

关键词： boron phosphide monolayer first-principles calculations nitrogen reduction reaction single-atom electrocatalysts

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Molten metal-organic complex to synthesize versatile ultrathin nonlayered oxides

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Nano Research 2024年第4期17卷 3147-3155页

作者： Kaisi Liu Jiabin wu Qun Li Hongrun Jin Yongxin Luo Bei Qi Simin Dai Jianquan Zhao Liang huang Jun Zhou Hubei Key Laboratory of Biomass Fibers and Eco-Dyeing&Finishing Wuhan Textile UniversityWuhan 430200China wuhan National Laboratory for Optoelectronics School of Optical and Electronic InformationHuazhong University of Science and TechnologyWuhan 430074China Analytical and Testing Center Huazhong University of Science and TechnologyWuhan 430074China

Two-dimensional(2D)materials have attracted a great deal of research interest because of their unique electrical,magnetic,optical,mechanical,and catalytic properties for various *** date,however,it is still difficult to fabricate most functional oxides as 2D materials unless they have a layered ***,we report a one-step universal strategy for preparing versatile non-layered oxide nanosheets by directly annealing the mixture of metal nitrate and dimethyl imidazole(2-MI).The 2-MI plays the key role for 2D oxides since 2-MI owns a very low molten point and sublimation temperature,in which its molten liquid can coordinate with metal ions,forming a metal-organic framework,and easily puffing by its gas molecules.A total of 17 materials were prepared by this strategy,including non-layered metal oxide nanosheets as well as metal/metal oxide loaded nitrogen-doped carbon *** as-prepared cobalt particle-loaded nitrogen-doped carbon nanosheets(Co@N/C)exhibit remarkable bifunctional oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)electrocatalytic activity and ***,the Zn-air battery utilizing a Co@N/C catalyst exhibits high power density of 174.3 mW·cm^(-2).This facile strategy opens up a new way for large-scale synthesis of 2D oxides that holds great potential to push 2D oxides for practical applications.

关键词： non-layered oxide nanosheet metal/metal oxide@N/C oxygen evolution reaction(OER) oxygen reduction reaction(ORR) Zn-air battery

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In-situ transient photovoltage study on interface electron transfer regulation of carbon dots/NiCo_(2)O_(4) photocatalyst for the enhanced overall water splitting activity

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Nano Research 2022年第3期15卷 1786-1795页

作者： Haodong Nie Yan Liu Yi Li Kaiqiang Wei Zhenyu wu Hong Shi Hui huang Yang Liu Mingwang Shao Zhenhui Kang Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyTaipa 999078Macao SARChina

Photocatalytic hydrogen production by overall water solar-splitting is a prospective strategy to solve energy ***,the rapid recombination of photogenerated electron–hole pairs deeply restricts photocatalytic activity of ***,the in-situ transient photovoltage(TPV)technique was developed to investigate the interfacial photogenerated carrier extraction,photogenerated carrier recombination and the interfacial electron delivery kinetics of the *** carbon dots/NiCo_(2)O_(4)(CDs/NiCo_(2)O_(4))composite shows weakened recombination rate of photogenerated carriers due to charge storage of CDs,which enhances the photocatalytic water decomposition activity without any *** can accelerate the interface electron extraction about 0.09 ms,while the maximum electron storage time by CDs is up to 0.7 *** optimal CDs/NiCo_(2)O_(4)composite(5 wt.%CDs)displays the hydrogen production of 62µmol·h^(−1)·g^(−1) and oxygen production of 29µmol·h^(−1)·g^(−1) at normal atmosphere,which is about 4 times greater than that of pristine NiCo_(2)O_(4).This work provides sufficient evidence on the charge storage of CDs and the interfacial charge kinetics of photocatalysts on the basis of in-situ TPV tests.

关键词： carbon dots photocatalytic hydrogen evolution transient photovoltage technique normal pressure continuous wavelet analysis

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Fatigue crack growth behavior of 2624-T39 aluminum alloy with different grain sizes

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Rare Metals 2021年第9期40卷 2523-2529页

作者： Guan huang Zhi-Hui Li Li-Ming Sun Xi-wu Li Kai Wen Li-Zhen Yan Bai-Qing Xiong Yong-An Zhang State Key Laboratory of Nonferrous Metals and Processes GRINM Group Co.Ltd.Beijing 100088China GRIMAT Engineering Institute Co. Ltd.Beijing 101407China General Research Institute for Nonferrous Metals Beijing 100088China Northeast Light Alloy Co. Ltd.Harbin 150060China

The microstructure of 2624-T39 aluminum alloy was analyzed by means of metallographic(OM), scanning electron microscope(SEM) and transmission electron microscope(TEM). The effects of different microstructure characteristics on the tensile properties and fatigue crack growth rate of 2624-T39 aluminum alloy were *** showed that the grain size of the alloy was a typical fiber structure along the rolling direction, and the main second phase was the A_(l2)CuMg phase. The grain size of the alloy had an obvious influence on the fatigue crack growth rate, and the alloy showed a lower fatigue crack growth rate due to the larger grain size. The crack initiation zone on the fracture surface of alloys with lower fatigue crack growth rate was relatively rough, the crack propagation zone had obvious fatigue striations, and the transient fracture zone had a large number of smaller dimples.

关键词： 2624-T39 aluminum alloy Grain size Fatigue crack growth rate Fatigue fracture morphology

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Regulation of the macrophage-related inflammatory microenvironment for atherosclerosis treatment and angiogenesis via anti-cytokine agents

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Nano Research 2022年第8期15卷 7342-7354页

作者： Hongji Pu Minghua Yao Zhaoyu wu Zhijue Xu Chaoyi Cui Renhua huang Muhammad Shafiq Weimin Li Xinwu Lu Bo Li Department of Vascular Surgery Shanghai Ninth People’s HospitalShanghai Jiao Tong University School of MedicineShanghai 200011China Department of Ultrasound Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200040China Department of Radiation Renji HospitalShanghai Jiao Tong University School of MedicineShanghai 200127China Department of Chemical Engineering Faculty of EngineeringGraduate SchoolKyushu University744 MotookaNishi-kuFukuoka 819-0395Japan

Macrophages-mediated atherosclerosis(AS)is an inflammatory disease and the most common cause of *** the progress of basic and clinical research,anti-cytokine therapy has garnered considerable attention of the research community for the regulation of the inflammatory microenvironment for AS *** of their promising potential,primary clinical trials have revealed that anti-cytokine drugs exhibit poor selectivity and thus affect other parts of the immune system,especially during long-term *** circumvent these limitations,herein we exploited mesoporous silica nanoparticles(MSNs)with a pore size of 15.5 nm as carriers for the anti-interleukin-1β(anti-IL-1β)delivery to be the anti-cytokine *** vitro mechanistic studies indicated that the MSNs@anti-IL-1βcan regulate the macrophage-related inflammatory microenvironment,promote the viability of vascular endothelial cells(vECs),and reduce proliferation and phenotypic switching of vascular smooth muscle cells(vSMCs).In vivo evaluation further revealed that the MSNs@anti-IL-1βwere preferentially accumulated in macrophages,impeding the AS progress by maintaining the endothelium integrity and inhibiting the vSMCs ***,MSNs@antiIL-1βinduced neovascularization and improved hindlimb ischemia *** together,these MSNs affording the sustained release of anti-cytokine agents may have broad implications for the clinical management of the AS,including the reduction of the AS progression and alleviation of the ischemia.

关键词： atherosclerosis inflammatory response nanocarriers macrophage endothelial cells

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N-doped porous carbon nanofibers sheathed pumpkin-like Si/C composites as free-standing anodes for lithium-ion batteries

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Journal of Energy Chemistry 2021年第3期30卷 727-735页

作者： Yanfei Zeng Yudai huang Niantao Liu Xingchao Wang Yue Zhang Yong Guo Hong-Hui wu Huixin Chen Xincun Tang Qiaobao Zhang Key Laboratory of Energy Materials Chemistry Ministry of EducationKey Laboratory of Advanced Functional MaterialsAutonomous RegionInstitute of Applied ChemistryCollege of ChemistryXinjiang UniversityUrumqi 830046XinjiangChina Department of Materials Science and Engineering College of MaterialsXiamen UniversityXiamen 361005FujianChina Beijing Advanced Innovation Center for Materials Genome Engineering School of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083HunanChina Xiamen Institute of Rare Earth Materials Haixi InstitutesChinese Academy of SciencesXiamen 361024FujianChina

Dramatic capacity fading and poor rate performance are two main obstacles that severely hamper the widespread application of the Si anode owing to its large volume variation during cycling and low intrinsic electrical *** mitigate these issues,free-standing N-doped porous carbon nanofibers sheathed pumpkin-like Si/C composites(Si/C-ZIF-8/CNFs)are designed and synthesized by electrospinning and carbonization methods,which present greatly enhanced electrochemical properties for lithium-ion battery *** particular structure alleviates the volume variation,promotes the formation of stable solid electrolyte interphase(SEI)film,and improves the electrical *** a result,the as-obtained free-standing Si/C-ZIF-8/CNFs electrode delivers a high reversible capacity of 945.5 mAh g^(-1) at 0.2 A g^(-1) with a capacity retention of 64% for 150 cycles,and exhibits a reversible capacity of 538.6 mA h g^(-1) at 0.5 A g^(-1) over 500 ***,the full cell composed of a freestanding Si/C-ZIF-8/CNFs anode and commercial LiNi_(1/3)Co_(1/3)Mn_(1/3)O_(2)(NCM)cathode shows a capacity of 63.4 mA h g^(-1) after 100 cycles at 0.2 C,which corresponds to a capacity retention of 60%.This rational design could provide a new path for the development of high-performance Si-based anodes.

关键词： Pumpkin-like silicon/carbon composites N-doped porous carbon nanofibers Free-standing anode Lithium-ion batteries

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Engineering high-performance dielectric chiral shells with enhanced chiral fields for sensitive chiral biosensor

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Rare Metals 2024年第3期43卷 1197-1206页

作者： Yi-Fan Wang Shan-Shan huang Zhen-Dong Dai Shi-Lin Xian Xuan-Nan wu Fu-Hua Gao Yi-Dong Hou College of Physics Sichuan UniversityChengdu610065China Graduate School of Sichuan University Sichuan UniversityChengdu610065China

Chiral metamaterials have been a topic of significant research interest in recent years due to their potential for various applications in nanophotonic devices and chiral ***,the intrinsic Ohmic loss in surface plasmonic resonance has limited their practical use,resulting in large light dissipation and weak chiroptical ***,we report on the development of high-performance dielectric chiral shells(DCS)through a two-step Si deposition process on a self-assembled microsphere *** form DCS sample completely oyercomes the cancelation effect originated from the disorder property of the micro-sphere monolayer in macroscale,and at a wavelength of approximately 710 nm,the measured optimal chiral signal(g-factor)and transmittance can reach up to 0.7 and 0.3,*** strong chiroptical effect comes from the asymmetric circular displacement currents(i.e.,magnetic modes)enabled by the specific shell *** chiral shell geometry,electromagnetic properties,sensor sensitivity of chiral molecules and figure of merit are systematically *** DCSs demonstrate highly sensitive detection of chiral biomolecules owing to their easily accessible geometry and enhanced uniform chiral field.

关键词： Dielectric chiral shells(DCS) Si deposition Magnetic resonance Highly sensitive sensor Chiral field

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Sealing functional ionic liquids in conjugated microporous polymer membrane by solvent-assisted micropore tightening

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Nano Research 2022年第3期15卷 2552-2557页

作者： Mengxi Zhang Anke Yu Xiangyu wu Pengpeng Shao Xin huang Dou Ma Xianghao Han Jing Xie Xiao Feng Bo Wang Frontiers Science Center for High Energy Material Advanced Technology Research Institute(Jinan)Beijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsKey Laboratory of Cluster ScienceMinistry of EducationSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China

Porous organic polymers hold great promise for molecular sieving membrane *** the inclusion of functional ionic liquid(IL)in the pores offers a facile way to manipulate their separation properties,the IL leaching during the separation process is difficult to ***,we report a strategy to in-situ encapsulate ILs into the micropores of the conjugated microporous polymer membrane via a 6-min electropolymerization and further seal the aperture of the pores to prevent ILs leaching by solvent-assisted micropore tightening(SAMT).Upon screening the binding energy between different ILs and gas molecules,two ILs were selected to be incorporated into the membrane for CO_(2)/CH_(4) and O_(2)/N_(2) gas *** resultant separation performances surpass the 2008 Robeson upper ***,the ILs can be locked in the micropores by a facile high surface tension solvent treatment process to improve their separation stability,as evidenced by a 7-day continuous *** simple and controllable process not only enables efficient and steady separation performance but also provides an effective strategy for confining and sealing functional guest molecules in the porous solids for various applications.

关键词： conjugated microporous polymer organic porous membrane in-situ encapsulation pore sealing membrane separation

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Seeking magneto-structural correlations in easily tailored pentagonal bipyramid Dy (Ⅲ) single-ion magnets

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Science China Chemistry 2020年第8期63卷 1066-1074页

作者： Guo-Zhang huang Ze-Yu Ruan Jie-Yu Zheng Yan-Cong Chen Si-Guo wu Jun-Liang Liu Ming-Liang Tong Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education School of ChemistrySun Yat-Sen UniversityGuangzhou 510275China

Controlling molecular magnetic anisotropy via structural engineering is delicate and fascinating,especially for single-molecule magnets(SMMs).Herein a family of dysprosium single-ion magnets(SIMs)sitting in pentagonal bipyramid geometry have been synthesized with the variable-size terminal ligands and counter anions,through which the subtle coordination geometry of Dy(Ⅲ)can be finely tuned based on the size *** effective energy barrier(Ueff)successfully increases from 439 to 632 K and the magnetic hysteresis temperature(under a 200 Oe/s sweep rate)raises from 11 to 24 *** on the crystal-field theory,a semi-quantitative magneto-structural correlation deduced experimentally for the first time is revealed that the Ueff is linearly proportional to the structural-related value S20 corresponding to the axial coordination bond lengths and the bond *** the evaluation of the remanent magnetization from hysteresis,quantum tunneling of magnetization(QTM)is found to exhibit negative correlation with the structural-related value Stun corresponding to the axial coordination bond angles.

关键词： single-molecule magnets magnetic anisotropy crystal field magneto-structural correlation

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