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Recent progress on surface chemistryⅠ:Assembly and reaction

Chinese Chemical Letters 2024年第12期35卷 43-94页

作者： Xin Li Zhen Xu Donglei Bu Jinming Cai Huamei Chen Qi Chen Ting Chen fang Cheng Lifeng Chi Wenjie Dong Zhenchao Dong Shixuan Du qitang fan Xing fan Qiang Fu Song Gao Jing Guo Weijun Guo Yang He Shimin Hou Ying Jiang Huihui Kong Baojun Li Dengyuan Li Jie Li Qing Li Ruoning Li Shuying Li Yuxuan Lin Mengxi Liu Peinian Liu Yanyan Liu Jingtao Lü Chuanxu Ma Haoyang Pan JinLiang Pan Minghu Pan Xiaohui Qiu Ziyong Shen Shijing Tan Bing Wang Dong Wang Li Wang Lili Wang Tao Wang Xiang Wang Xingyue Wang Xueyan Wang Yansong Wang Yu Wang Kai Wu Wei Xu Na Xue Linghao Yan fan Yang Zhiyong Yang Chi Zhang Xue Zhang Yang Zhang Yao Zhang Xiong Zhou Junfa Zhu Yajie Zhang Feixue Gao Yongfeng Wang Center for Carbon-based Electronics and Key Laboratory for the Physics and Chemistry of Nanodevices School of ElectronicsPeking UniversityBeijing 100871China Spin-X Institute School of MicroelectronicsSouth China University of TechnologyGuangzhou 511442China School of Materials and Energy Guangzhou Key Laboratory of Low-Dimensional Materials and Energy Storage DevicesGuangdong University of TechnologyGuangzhou 510006China Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093 China i-Lab CAS Key Laboratory of Nanophotonic Materials and DevicesSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China CAS Key Laboratory of Molecular Nanostructure and Nanotechnology CAS Research/Education Center for Excellence in Molecular SciencesBeijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of SciencesBeijing 100190China State Key Laboratory for Organic Electronics and Information Displays&Jiangsu Key Laboratory for Biosensors Institute of Advanced MaterialsJiangsu National Synergetic Innovation Center for Advanced MaterialsNanjing University of Posts and TelecommunicationsNanjing 210023China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China Hefei National Research Center for Physical Sciences at the Microscale and Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Institute of Physics&University of Chinese Academy of Sciences Beijing 100190China State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry Beijing Normal UniversityBeijing 100875China Beijing National Laboratory for Molecular Sciences(BNLMS) College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China School

Surface chemistry focuses on the investigation of the adsorption,migration,assembly,activation,reaction,and desorption of atoms and molecules at *** chemistry plays the pivotal roles in both fundamental science and applied *** review will summarize the recent progresses on surface assembly,synthesis and catalysis investigated mainly by scanning tunneling microscopy and atomic force *** assemblies of water and small biomolecules,construction of Sierpin′ski triangles and surface chirality are ***-surface synthesis of conjugated carbo-and heterocycles and other kinds of carbon nanostructures are *** model catalysis,including single-atom catalysis and electrochemical catalysis,are discussed at the single-atom level.

关键词： Surface chemistry Assembly Surface synthesis Catalysis on surface Surface electrochemical processes

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Element segregation behavior of aluminum-copper alloy ZL205A

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China Foundry 2014年第6期11卷 510-515页

作者： fan Li Hao qitang Xian Fuchao State Key Laboratory of Solidifi cation Processing Northwestern Polytechnical University Tianjin Long March Space Rocket Manufacturing Company Limited

In aluminum-copper alloy, the segregation has a severe bad effect on the alloying degree, strength and corrosion resistance. A deeper understanding of element segregation behavior will have a great signif icance on the prevention of segregation. In the study, the element segregation behavior of ZL205 A aluminum-copper alloy was investigated by examining isothermally solidifi ed samples using scanning electron microscopy and energy dispersive spectroscopy. The calculated results of segregation coeffi cients show that Cu and Mn are negative segregation elements; while Ti, V and Zr are positive segregation elements. The sequence of element segregation degree from the greatest to the least in ZL205 A alloy is Cu, Mn, V, Ti, Zr and Al. The density of residual liquid is expected to increase with a decrease in the quenching temperature ranging from 630 ℃ to 550 ℃. The calculated results conf irm that the quenching temperature has an insignif icant effect on the liquid density; and the variation of density is mainly due to element segregation. Consequently, segregations of Al, Cu and Mn lead to an increase in density, but Ti, V and Zr present the opposite effect. The contribution of each element to the variation of the liquid density was analyzed. The sequence of contributions of alloying elements to the variation of total liquid density is Cu>Al>Mn>V>Ti>Zr.

关键词： ZL205A isothermal solidifi cation element segregation segregation coeffi cient liquid density

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Effect of centrifugal counter-gravity casting on solidification microstructure and mechanical properties of A357 aluminum alloy

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China Foundry 2014年第1期11卷 14-19页

作者： Li Xinlei Hao qitang Miao Xiaochuan fan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an Chaoma Technology Company Limited

To investigate the influence of Centrifugal Counter-gravity Casting(C3) process on the solidification microstructure and mechanical properties of the casting, A357 aluminum alloy samples were produced by different process conditions under C3. The results show that C3 has better feeding capacity compared with the vacuum suction casting; and that the mechanical vibration and the convection of melts formed at the centrifugal rotation stage suppress the growth of dendrites, subsequently resulting in the refinement of grains and the improvement of mechanical properties, density and hardness. A finer grain and higher strength can be obtained in the A357 alloy by increasing centrifugal radius and rotational speed. However, casting defects will appear near the rotational axis and the mechanical properties will decrease once the rotational speed exceeds 150 r·min-1.

关键词： centrifugal counter-gravity casting vacuum suction casting rotational speed solidification feeding

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混合稀土对ZL114A铝合金组织性能的影响

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热加工工艺 2014年第17期43卷 61-63页

作者：韩文科郝启堂范理西北工业大学凝固技术国家重点实验室陕西西安710072

采用金相显微镜、SEM、EDS和差示扫描量热法等手段研究了混合稀土（60%Ce、40%La）对ZL114A铝合金组织性能的影响。结果表明：当稀土添加量（质量分数）为0.15%-0.35%时,随着稀土添加量的增加,晶粒尺寸、一次枝晶间距、二次枝晶间距减小... 详细信息

采用金相显微镜、SEM、EDS和差示扫描量热法等手段研究了混合稀土（60%Ce、40%La）对ZL114A铝合金组织性能的影响。结果表明：当稀土添加量（质量分数）为0.15%-0.35%时,随着稀土添加量的增加,晶粒尺寸、一次枝晶间距、二次枝晶间距减小;当稀土添加量为0.25%时,α-Al相的晶粒尺寸、一次枝晶间距、二次枝晶间距达到最低,此时抗拉强度、伸长率和显微硬度达到最高。DSC结果显示,添加稀土降低了合金的共晶点温度和α-Al的熔化温度,减小了凝固温度区间。

关键词： ZL114A铝合金稀土显微组织

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TRIZ在挖掘机液压系统设计中的应用研究

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液压与气动 2007年第10期31卷 32-33页

作者：苏启棠范卫国彭秀英杨成银贵州大学蔡家关校区机械工程与自动化学院贵州贵阳550003

该文提出应用TRIZ中的通用发明原理,指导挖掘机液压系统的设计,这对于开发具有竞争优势的液压挖掘机,具有重要的作用和意义。

关键词： TRIZ 挖掘机液压系统设计

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青藏高原羌塘南部冈玛错地区展金组的沉积环境分析及碎屑锆石U-Pb定年

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地质学报 2014年第10期88卷 1820-1831页

作者：范建军李才王明解超明吴彦旺吉林大学地球科学学院长春130061 中国国土资源航空物探遥感中心北京100083

展金组由梁定益等于日土县多玛区吉普村北展金河命名,本文研究的展金组位于藏北羌塘中央隆起带,前人称之为"浅变质岩系",其时代、形成环境、构造属性等存在较大争议。笔者以展金组出露最为典型的地区——青藏高原羌塘南部冈玛错地区为... 详细信息

展金组由梁定益等于日土县多玛区吉普村北展金河命名,本文研究的展金组位于藏北羌塘中央隆起带,前人称之为"浅变质岩系",其时代、形成环境、构造属性等存在较大争议。笔者以展金组出露最为典型的地区——青藏高原羌塘南部冈玛错地区为研究区,对展金组进行详细的剖面测制、碎屑锆石的U-Pb定年。结果表明,展金组为晚石炭世—早二叠世冈瓦纳大陆不规律的冰川作用于冈瓦纳大陆北缘古特提斯洋大洋盆地的产物,在冈玛错地区可识别出三期较大的冰川运动;展金组的物源为自泛非运动以来一直处于稳定的冈瓦纳大陆,其所处羌南-保山板块为冈瓦纳大陆的一部分。该项研究为探讨冈瓦纳大陆北缘的沉积环境提供了依据。

关键词：冈瓦纳大陆羌塘南部展金组沉积环境碎屑锆石

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