检索结果-内蒙古大学图书馆

Understanding the intrinsic synergistic mechanism between Pt-O-Ti interface sites and TiO_(2) surface sites of Pt/TiO_(2) catalysts in Fenton-like reaction

引用

Science China Chemistry 2022年第12期65卷 2596-2603页

作者： Yawen Ma Huibin Ge Siwen Yi Man Yang Dan Feng Yujing Ren Jie Gao Yong Qin Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Xi’an University of TechnologyXi’an710048China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan030001China

Identifying the active site of oxide-supported metal catalysts and revealing the intrinsic synergistic mechanism between metal and oxide support remain a large ***,we report the identification and separation of the Pt-O-Ti interface and TiO_(2) surface in Pt-TiO_(2)-based catalysts by depositing different thickness of TiO_(2) shell with∼0.4-nm micropores onto the surface of Pt/TiO_(2) catalyst through atomic layer deposition(ALD).In the oxidation of 3,3′,5,5′-tetramethylbenzidine(TMB)by hydrogen peroxide(H_(2)O_(2))process,the TiO_(2) microporous shells can prevent the contact between TMB and embedded Pt clusters,but not delay the diffusion of H_(2)O_(2).The heterolysis of H_(2)O_(2) to ·OH occurs on the Pt-O-Ti interface,and the generated•OH migrates to the TiO_(2) surface to supplement the surface lattice oxygen,which sequentially oxidizes TMB to *** the synergistic effect between Pt-O-Ti interface active sties and TiO_(2) surface active sites can significantly improve the catalytic *** study provides a guide for the understanding of the intrinsic synergistic mechanism between the metal and oxide support in the metal-oxide catalysts.

关键词： Intrinsic synergistic mechanism Pt-O-Ti interface site TiO_(2)surface site Fenton-like reaction metal-oxide catalyst

来源：评论

学校读者我要写书评

暂无评论

Insights into the effect of substrate adsorption behavior over hemelike Fe_(1)/AC single-atom catalyst

引用

Nano Research 2022年第7期15卷 5970-5976页

作者： Jianglin Duan Yanan Zhou Yujing Ren Dan Feng Jinlong Shang Huibin Ge Jie Gao Jinlong Yang Yong Qin Interdisciplinary Research Center of Biology&Catalysis School of Life SciencesNorthwestern Polytechnical UniversityXi’an 710072China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Coal Conversion Institute of Coal ChemistryChinese Academy of SciencesTaiyuan 030001China

Unraveling the substrate adsorption structure–performance relationship is pivotal for heterogeneous carbon supported metal single-atom catalysts(M_(1)/C SACs).However,due to the complexity of the functional groups on carbon material surface,it is still a great ***,inspired by structure of enzymes,we used activated carbon(AC),which has adjustable surface oxygen functional groups(OFGs),supported atomically dispersed Fe-N_(4) sites as heme-like *** based on a combination of scanning transmission electron microscopy(STEM),X-ray photoelectron spectroscopy(XPS),X-ray absorption spectroscopy(XAS),Mössbauer spectroscopy,Fourier transform infrared(FT-IR)characterizations,kinetics experiments and density functional theory(DFT)calculations,we revealed the effect of substrate adsorption behavior on AC support surface,that is,with the increase of carboxyl group in OFGs,the adsorbed 3,3',5,5'-tetramethylbenzidine(TMB)molecular increased,and consequently the substrate enriched on AC *** carboxyl group as well as Fe-N_(4) active sites synergistically realized high-efficiency peroxidase-like activity,just like the *** work suggests that simultaneously constructing metal single-atom active sites and specific functional groups on carbon support surface may open an avenue for engineering metal-support synergistic catalysis in M_(1)/C SACs,which can further improve catalytic performance.

关键词： single-atom catalysts heme-like carboxyl group substrate adsorption behavior peroxidase-like activity

来源：评论

学校读者我要写书评

暂无评论

Enhanced mechanical performance of grain boundary precipitation-hardened high-entropy alloys via a phase transformation at grain boundaries

引用

Journal of Materials Science & Technology 2021年第27期86卷 271-284页

作者： Y.L.Qi L.Zhao X.Sun H.X.Zong X.D.Ding F.Jiang H.L.Zhang Y.K.Wu L.He F.Liu S.B.Jin G.Sha J.Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an710049China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China

Grain-boundary(GB)precipitation has a significant adverse effect on plasticity of alloys,which easily leads to catastrophic intergranular failure in safety-critical applications under high external ***,we report a novel strategy that uses the local stress concentration induced by GB precipitates as a driving force to trigger phase transformation of preset non-equiatomic high-entropy solid-solution phase at *** in situ deformation-induced phase transformation at GBs introduces a well-known effect:transformation-induced plasticity(TRIP),which enables an exceptional elongation to fracture(above 38%)at a high strength(above 1.5 GPa)in a GB precipitation-hardened high-entropy alloy(HEA).The present strategy in terms of"local stress concentration-induced phase transformations at GBs"may provide a fundamental approach by taking advantage of(rather than avoiding)the GB precipitation to gain a superior combination of high strength and high ductility in HEAs.

关键词： Non-equiatomic Grain-boundary precipitation High-entropy alloys Ductility Transformation-induced plasticity

来源：评论

学校读者我要写书评

暂无评论

Transition of dynamic recrystallization mechanism during hot deformation of Incoloy 028 alloy

引用

Journal of Materials Science & Technology 2020年第7期42卷 241-253页

作者： XiTing Zhong Lei Wang LinKe Huang Feng Liu State Key Lab of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China State Key Laboratory for Performance and Structure Safety of Petroleum Tubular Goods and Equipment Materials CNPC Tubular Goods Research InstituteXi'an710077China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China

Dynamic recrystallization(DRX)plays significant roles in manipulating of microstructures during hot deformation and the result mechanical properties;however,the underling mechanism leading to multi scale-microstructures remains poorly ***,the DRX mechanism under wide processing conditions(i.e.950-1200°C,0.001-10 s-1)in Incoloy 028 alloy was investigated,where the relationships among flow stress,Z parameter and grain size,as well as the evolution of characteristic microstructures(grain size,sub-grain boundaries,and high angle grain boundaries),are *** the values of Z parameters decrease(corresponding to decreased flow stresses),three typical softening mechanisms successively occur,ranging from continuous DRX controlled by dislocation glide,discontinuous DRX dominated by dislocation motion(climb and cross/multiple slip)and grain boundary migration,to dynamic normal/abnormal grain growth resulting from grain boundary migration,with transition regions where two adjacent mechanisms occur ***,these above three softening mechanisms result in ultrafine,fine and coarse grains,*** present findings demonstrate a comprehensive understanding of DRX mechanism over a wide range of processing conditions,and further provide a new guideline for preparing single crystals.

关键词： Hot deformation Dynamic recrystallization Microstructure evolution Incoloy 028

来源：评论

学校读者我要写书评

暂无评论

Application of non-equilibrium dendrite growth model considering thermo-kinetic correlation in twin-roll casting

引用

Journal of Materials Science & Technology 2020年第9期44卷 209-222页

作者： Yubing Zhang Jinglian Du Kang Wang Huiyuan Wang Shu Li Feng Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an710072China Key Laboratory of Automobile Materials of Ministry of Education and Department of Materials Science and Engineering Jilin UniversityChangchun130025China School of Science Harbin University of Science and TechnologyHarbin150080China Analytical&Testing Center Northwestern Polytechnical UniversityXi’an710072China

Upon non-equilibrium solidifications, dendrite growth, generally as precursor of as-solidified structures,has severe effects on subsequent phase transformations. Considering synergy of thermodynamics and kinetics controlling interface migration and following conservation of heat flux in solid temperature field, a more flexible modeling for the dendrite growth is herein developed for multi-component alloys,where, two inherent problems, i.e. correlation between thermodynamics and kinetics(i.e. the thermokinetic correlation), and theoretical connection between dendrite growth model and practical processing,have been successfully solved. Accordingly, both the thermodynamic driving force G and the effective kinetic energy barrier Qeffhave been found to control quantitatively the dendrite growth(i.e. especially the growth velocity, V), as reflected by the thermo-kinetic trade-off. Compared with previous models, it is the thermo-kinetic correlation that guarantees quantitative connection between the practical processing parameters and the current theoretical framework, as well as more reasonable description for kinetic behaviors involved. Applied to the vertical twin-roll casting(VTC), the present model, realizes a good prediction for kissing points, which influences significantly alloy design and processing *** work deduces quantitatively the thermo-kinetic correlation controlling the dendrite growth, and by proposing the parameter-triplets(i.e. G-Qeff-V), further opens a new beginning for connecting solidification theories with industrial applications, such as the VTC.

关键词： Dendrite growth Multi-component alloys Thermo-kinetic correlation Vertical twin-roll casting

来源：评论

学校读者我要写书评

暂无评论

Development of a poly(arylene sulfide sulfone)antibacterial electrospun film as a skin wound dressing application

引用

Journal of Innovative Optical Health Sciences 2022年第2期15卷 32-41页

作者： Xuzhi Lang Zhurong Tang Zhimei Wei Xiaojun Wang Shengru Long Gang Zhang Jie Yang Qingyu Lin Qingdao Benzo Chemical Company Limited Qingdao 266300 P.R.China Institute of Life Sciences Chongqing Medical University Chongqing 400016P.R.China Institute of Materials Science and Technology Analytical&Testing Center Sichuan University Chengdu 610065P.R.China State Key Laboratory of Polymer Materials Engineering(Sichuan University) Chengdu 610065P.R.China School of Mechanical Engineering Research Center of Analytical Instrumentation Sichuan University Chengdu 610065P.R.China

Tissue engineering has become a hot issue for skin wound healing because it can be used as an alternative treatment to traditional *** films have been widely used due to their excellent *** this work,an organic/inorganic composite poly(arylene sulfide sulfone)/ZnO/graphene oxide(PASS/ZnO/GO)nanofibrous film was fabricated with the ZnO nano-particles blending in an electrospun solution and post-treated with the GO *** optimal PASS/ZnO/GO nanofibrous film was prepared by 2%ZnO nanoparticles,3.0g/mL PASS electrospun solution,and 1%GO dispersion *** morphology,hydrophilicity,mechanical property,and cytotoxicity of the PASS/ZnO/GO nanofibrous film were character-ized by using scanning electron microscopy,transmission electron microscope,water contact angle,tensile testing,and a Live/Dead cell staining *** is founded that the PASS/ZnO/GO nanofibrous film has outstanding mechanical properties and no ***,the PASS/ZnO/GO nanofibrous film exhibits excellent antibacterial activity to both Escherichia coli and Staphylococcus *** all,this high mechanical property in the non-toxic and antibacterial nanofibrous film will have excellent application prospects in skin wound dressing.

关键词： Graphene oxide electrospinning antibacterial skin wound dressing

来源：评论

学校读者我要写书评

暂无评论

Structural insight into EV-A713A protein and its interaction with a peptide inhibitor

引用

Virologica Sinica 2023年第6期38卷 975-979页

作者： Yahui Liu Panjing Lv Wei Wang Jiahai Zhang Xi Zhou Yang Qiu Kun Cai Haoran Zhang Yuan Fang Yan Li Department of Pathogen Biology School of Basic MedicineTongji Medical College and State Key Laboratory for Diagnosis and Treatment of Severe Zoonotic Infectious DiseasesHuazhong University of Science and TechnologyWuhan430030China Medical Subcenter of HUST Analytical&Testing Center Huazhong University of Science and TechnologyWuhan430030China MOE Key Laboratory for Membraneless Organelles and Cellular Dynamics School of Life SciencesDivision of Life Sciences and MedicineUniversity of Science and Technology of Chin1Hefei230027China State Key Laboratory of Virology Wuhan Institute of VirologyChinese Academy of SciencesWuhan430071China Institute of Health Inspection and Testing Hubei Provincial Center for Disease Control and Prevention(Hubei CDC)Wuhan430079China Department of Pediatrics Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430030China

Dear Editor,Hand,foot,and mouth disease(HFMD)is a common illness among children that is usually mild and ***,in some severe cases,patients may rapidly develop neurological and systemic complications that can be fatal(Ooi et al.,2010).HFMD is caused by a few serotypes of human enterovirus A(HEV-A)species(Yu and Cowling,2019),with enterovirus A71(EV-A71)and coxsackievirus A16(CV-A16)being the most typical causative agents(Yu and Cowling,2019).Furthermore,severe neurological sequelae are more common in cases with EV-A71 serotype infection than other serotypes(Ooi et al.,2010;Yu and Cowling,2019).There has been a significant increase in EV-A71 epidemic activity throughout the Asia–Pacific region(McMinn,2002)since EV-A71 was first isolated from a patient with central nervous system(CNS)disease in 1969(Schmidt et al.,1974).EV-A71 is a small non-enveloped virus belonging to HEV-A species of the genus Enterovirus in the family Picornaviridae(Nasri et al.,2007).Its genome is a single-stranded positive-sense RNA of approximately 7400 bp in length and contains only one complete open reading frame(ORF),which encodes a large polyprotein(Solomon et al.,2010).

关键词： enterovirus insight

来源：评论

学校读者我要写书评

暂无评论

Microalloying-Modulated Strength-Ductility Trade-Offs In 6111 Al Alloys

SSRN

引用

SSRN 2022年

作者： Jiang, Yan Li, Yusong Liu, Feng State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shanxi Xi’an710072 China Analytical & Testing Center Northwestern Polytechnical University Shanxi Xi’an710072 China

Conflicts between strength and ductility are frequently found in metallic materials. Herein, detailed and quantitative strengthening effects from various kinds of secondary phases were presented for the first time, through changing Ge and Sb content. Three kinds of strength-ductility trade-off relations were elaborated by deformation, embrittling and strengthening mechanisms, as reflected by solidification experiments, multi-mechanistic models and first principles calculations. Microalloying-modulated strength-ductility trade-offs are strongly associated with their special microstructures, where coarse primary phases increase and fine precipitates are modified. As compared to the secondary phases contributing up to 81.9% of the strength increments, strengthening effects from solid-solution atoms (6.5~8.7 %), grain boundaries (1.8~2.5 %) and coarse primary phases are negligible. Therefore, the trade-off relations were modulated by modifying the fine precipitates, including Mg 2 Si plates, Al 4 Cu 2 Mg 8 Si 7 needles, Al 2 Cu dispersoids, (Ge, Si) rods/particles and nano-sized Si particles. The newly formed coarse primary phases like Mg 3 Sb 2 phases, Mg 2 (Ge, Si) phases and (Ge, Si) structures, helped to decrease the ductility. © 2022, The Authors. All rights reserved.

关键词： Ductility

来源：评论

学校读者我要写书评

暂无评论

Characterization of Various Interfaces in a Tial-Based Alloy

SSRN

引用

SSRN 2022年

作者： Gao, Xiangyu Wang, Jie Feng, Dan Yang, Xiubo Wu, Lunyu Gao, Zitong Liu, Feng Analytical & Testing Center Northwestern Polytechnical University Shaanxi Xi’an710072 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Xi’an710072 China

As for a two phase TiAl-based alloy, γ/α 2 lamellar structure has been studied, where, various atomic microstructures for interfaces generated by phase transformation and recrystallization upon high-temperature compression have been studied. As expected, mixed interfaces including phase boundary (PB), true twin (TT), pseudo-twin (PT), 120° rotational boundary (RB) and large angle grain boundary (LAGB) can be observed in the as-formed structure. A detailed characterization using high resolution electron microscopy has been performed, which helps to obtaining the optimum microstructure and the corresponding excellent mechanical properties of the TiAl alloy. © 2022, The Authors. All rights reserved.

关键词： Titanium alloys

来源：评论

学校读者我要写书评

暂无评论

Micro-Alloying Modulated Strength-Ductility Trade-Offs in 6111 Al Alloys

SSRN

引用

SSRN 2022年

This work presents for the first time detailed and quantitative strengthening effects of as-cast Al-Mg-Si-Cu alloys modified with Ge and Sb, with an emphasis laid on the presence of three typical strength-ductility trade-off relations. It reveals that, as mainly composed of α-Al, Mg 2 Si (β) and Al 4 Cu 2 Mg 8 Si 7 (Q) phases, Ge additions facilitate forming Mg 2 (Ge, Si) and diamond (Ge, Si) structures, whereas Sb additions promote the formation of Mg 3 Sb 2 , Q and Al 2 Cu (θ) intermetallics. Mechanisms for the plastic deformation, the decreased ductility and the increased strength of the modified alloys were elucidated by a combination of first-principles calculations, experimental observations and multi-mechanistic models. It demonstrates that the occurrence of micro-alloying correlated strength-ductility trade-offs is closely related to the secondary phases, among which the coarse primary phases tend to determine the decrement of ductility whereas the precipitates like the coarse precipitates and the nano-sized particles account for 72.9%~81.9% of the total strength. Relevant mechanisms are analyzed and discussed systematically, which may provide guidelines for a detailed understanding of strength-ductility trade-offs in the as-cast conditions, as a fundamental aspect regarding the role of alloying elements on the microstructure and mechanical properties. © 2022, The Authors. All rights reserved.

关键词： Aluminum alloys

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：