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Silicon nanoporous pillar array and its surface copper deposition

Chinese Science Bulletin 2005年第14期50卷 1424-1428页

作者： FU Xiaonan1,2.3. CHAI Huadou1,2.& LI Xinjian1,2.1. department of {2., zhengzhou {3., zhengzhou 450052. China 2. Key Laboratory of Material {2. (zhengzhou {3.), Ministry of Education, zhengzhou 450052. China {12., henan university of tech- nology, zhengzhou 450052. China department of physics Zhengzhou University Zhengzhou 450052 China Key Laboratory of Material physics (zhengzhou {2.) Ministry of Education Zhengzhou 450052 China department of mathematics and {2. Henan University of Technology Zhengzhou 450052 China

Silicon nanoporous pillar array (Si-NPA) has been prepared by a hydrothermal etching technique. Using Si-NPA as substrate, a Cu/Si-NPA nanocomposite thin film has been obtained with immersion plating method. Morpho- logical and structural analysis indicates that Si-NPA is a typical structural composite system characterized by a triple hierarchical structure, i. e. the array of micron-sized silicon pillars, the nanopores densely distributed on the surface of the pillars, and the silicon nanocrystallites that constitute the pore walls. Cu/Si-NPA inherits the morphological character- istics of Si-NPA. The compactability of the deposited copper nanoparticles varies alternatively with the local geometrical features of Si-NPA and forms a quasi-periodical pattern. Such an experimental phenomenon is attributed to the veloc- ity dependence of the copper deposition upon the local geo- metrical features of Si-NPA. These results indicate that Si-NPA might be used as an ideal template for preparing specially patterned, structured or functionalized metal/ sili- con nanocomposite systems.

关键词：硅元素薄膜蚀刻技术电镀技术

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Virtualities of quark and gluon in QCD vacuum

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Science China(physics,Mechanics & Astronomy) 2008年第10期51卷 1439-1447页

作者： ZHOU LiJuan1, QIN SongMei2. WU Qing3.& MA WeiXing4 1 Collaboration Group of Hadron physics and Non-perturbative QCD Study, Guangxi {2. of tech- {3., Liuzhou 545006, China 2.department of physics, Guangxi {2., Nanning 540003. China 3.department of physics, Qingdao {2., Qingdao 2.6071, China 4 Institute of High Energy physics, Chinese Academy of Sciences, Beijing 100049, China Collaboration Group of Hadron physics and Non-perturbative QCD Study Guangxi University of Technology Liuzhou China department of physics Guangxi University Nanning China department of physics Qingdao University Qingdao China Institute of High Energy physics Chinese Academy of Sciences Beijing China

The non-local vacuum condensates of quantum chromodynamics (QCD) describe the distributions of quarks and gluons in the non-perturbative QCD vacuum state. Physically, this means that vacuum quarks and gluons have a nonzero mean-squared momentum in the vacuum, called virtuality. The quark virtuality is given by the ratio of the local quark-gluon mixed vacuum condensate to the quark local vacuum condensate. The gluon virtuality is expressed by gluon vacuum condensates and four-quark vacuum condensates. We study the two virtualities by solving Dyson-Schwinger Equations and calculating quark and gluon vacuum condensates. Our theoretical results for quark virtuality are in good agreement with many other theoretical model predictions such as QCD sum rules and lattice QCD calculations. Our calculation on gluon virtuality is initial and the results are quite interesting.

关键词： quark gluon virtuality QCD vacuum condensate non-perturbative QCD

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An atomistic simulation of site preference and vibrational properties of UMxAl12.x (M = Fe, Co, Ni, Cr and Mn) and UMxAl12.xHx

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Progress in Natural Science:Materials International 2009年第8期19卷 983-989页

作者： Huijun Tian a,b, Ping Qian a, Jiang Shen a, Nanxian Chen a,c a Institute of Applied physics, Beijing university of Science and {2.{3., Beijing 100083. China b School of physics, Beijing university of Chemical {2.{3., Beijing 10002., China c department of physics, Tsinghua university, Beijing 100084, China Institute of Applied physics Beijing University of Science and Technology Beijing 100083 China School of physics Beijing University of Chemical Technology Beijing 100029 China department of physics Tsinghua University Beijing 100084 China

A series of lattice inversion pair potentials are used to evaluate the phase stability and site preference for uranium intermetallics UMxAl12.x (M = Fe, Co, Ni, Cr and Mn) and their related hydrides. Calculated results show that Fe, Co, Ni, Cr or Mn atoms preferentially substitute Al at the 8f site. Interstitial H atoms only occupy 2. interstitial sites in UMxAl12.x. Calculated lattice constants are found to agree with a report in the literature. Elastic constants and bulk modulus of UMxAl12.x and UMxAl12.xH were also investigated. In particular, the phonon densities of states (DOS) of these actinide compounds were evaluated for the first time.

关键词： Interatomic potentials Site preference Lattice vibration

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规整、均一纳米水滑石晶体的水热合成与表征

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化学学报 2006年第22期64卷 2231-2234页

作者：郑建华田熙科俞开潮王龙艳杨超何明中中国地质大学材料科学和化学工程学院武汉430074 华中科技大学化学系武汉430074

采用一种简便的新方法,以Mg2./Al3./CO2.0}摩尔比为6∶2.1的比例在水热条件下合成了[Mg-Al-CO3.水滑石.获得的水滑石样品用XRD,FE-SEM,TEM,HRTEM,TG-DSC进行了物相、晶体形貌结构和热分析.用动态光散射原理分析了粒度分布,考察了水热合... 详细信息

采用一种简便的新方法,以Mg2./Al3./CO2.0}摩尔比为6∶2.1的比例在水热条件下合成了[Mg-Al-CO3.水滑石.获得的水滑石样品用XRD,FE-SEM,TEM,HRTEM,TG-DSC进行了物相、晶体形貌结构和热分析.用动态光散射原理分析了粒度分布,考察了水热合成的主要条件水热温度和时间对水滑石晶体尺寸及粒度分布的影响.结果表明,本法合成的水滑石具有均一、规整的六边形片状晶体形貌,片状晶体直径在3.0nm左右,片的厚度约2.nm,纯水滑石相,粒度分布在80～42.nm.水热温度和时间主要影响片状晶体的直径,而对晶体形貌影响不大;延长反应时间,升高水热温度可使六边形晶片长大.

关键词：水滑石水热合成晶体形貌粒度

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