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Polymer-assisted nanoparticulate contrast-enhancing materials

Science china Chemistry 2010年第3期53卷 479-486页

作者： DING Yin1,3,HU Yong2.WU Wei1 & JIANG XiQun1 1laboratory of Mesoscopic Chemistry and department of Polymer Science and Engineering,College of Chemistry & Chemical Engineering,{2.,nanjing 2.0093,china 2.ational laboratory of solid state microstructure,department of material Science and Engineering,{2.,nanjing 2.0093,china 3Key laboratory of Analytical Chemistry for Life Science,Ministry of Education,School of Chemistry and Chemical Engineering,{2.,nanjing 2.0093,china 1. laboratory of Mesoscopic Chemistry and department of Polymer Science and Engineering College of Chemistry & Chemical Engineering Nanjing University Nanjing 210093 China3. Key Laboratory of Analytical Chemistry for Life Science Ministry of Education School of Chemistry and Chemical Engineering Nanjing University Nanjing 210093 China2. National Laboratory of Solid State Microstructure Department of Material Science and Engineering Nanjing University Nanjing 210093 China

The application of nanotechnology in medicine research has significant potential in modern biomedical research,disease diagnosis and *** fluorophore-based detection techniques have been widely used as imaging and signal transduction tools for the detection of trace levels of *** photosensitivity of the fluorophores,however,limits their application in such complex environments as living bio-systems where degradation or photobleaching *** nanoparticles have unique and stable optical,electrical,magnetic and catalytic properties because of their various shapes,sizes and *** potential of the nanoparticles as novel imaging agents has been studied as a possible solution to this *** modification of inorganic nanoparticles could enhance their biostability in physiological conditions and ability of targeting bioactive molecules.

关键词： contrast agent cell image gold nanoparticles iron oxide nanoparticles carbon nanotubes polymeric-inorganic hybrid nanoparticles

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Influences of low-Ti substitution for La and Mg on the electrochemical and kinetic characteristics of AB_3-type hydrogen storage alloy electrodes

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Science china(Technological Sciences) 2010年第1期53卷 242-247页

作者： DONG ZhenWei1,2.WU YaoMing1,MA LiQun2.SHEN XiaoDong2.& WANG LiMin1 1 state Key laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,C hangchun 13002.,{2. 2.College of material Science and Engineering,nanjing university of Technology,nanjing 2.0009,{2. 1. state Key laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China2. College of Material Science and Engineering Nanjing University of Technology Nanjing 210009 China

The(La0.67Mg0.33)1-xTixNi2.75Co0.2.(x = 0,0.05,0.10,0.15 and 0.2.,at%) alloys were synthesized by arc melting and subsequent heat solid-liquid diffusing *** structure,electrochemical properties and kinetic characteristics of the alloys were investigated *** results showed that all the alloys mainly consisted of the(La,Mg)Ni3,LaNi5 phases,and the lattice parameters and the cell volumes of the(La,Mg)Ni3 and LaNi5 phases decreased with increasing Ti *** alloy electrodes could be activated to reach their maximum discharge capacity within five *** cycle life after 100 charge/discharge cycles(C100/Cmax) and the high-rate dischargeability at a discharge current density of 12.0 mA/g first increased and then *** the results showed that low-Ti content in AB3-type hydrogen storage alloys was beneficial to improvements of the overall electrochemical properties,and the optimum overall electrochemical performance of the alloy electrodes was obtained when x = 0.05.

关键词： AB3-type alloy metal hydride electrode microstructure electrochemical property kinetic characteristic

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Fabrication of Ni-decorated helical ribbon composite microstructure from self-assembled lipid tubule by electroless metallization

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Science china Chemistry 2006年第3期49卷 238-245页

作者： FU Yubin1,2. ZHANG Lide1 & ZHENG Jiyong2.1. Institute of solid state Physics, {2. Academy of Sciences, Hefei 2.0031, {2. 2. Luoyang Ship material Research Institute, Luoyang 471039, {2. 1. Institute of solid state Physics China Academy of Sciences Hefei 230031 China 2. Luoyang Ship material Research Institute Luoyang 471039 China

Lipid molecules can self-assemble into a tubular structure, which is formed by tightly wound helical ribbons. Lipid tubules are utilized as a precursor to fabricate a novel Ni-decorated helical ribbon composite microstructure in a high yield by electroless deposition. The microstructure carries Ni nanoparticles on the flat face and wires at the edge of helical ribbon, in which the average size of nanoparticles is about 40―60 nm, and the wires are of a layered structure strongly correlated with a multi-bilayer structure in the lipid membrane. Compared with the tubular precursor, the Ni-decorated composite microstructure becomes short and irregular shapes due to the breakage in the deposition, and its formation is largely bound up with the tubular helical structure and the different catalytic process. Finally, the helical composite microstructure would have a potential application in the development of electric active materials.

关键词： molecular self-assembly, lipid tubule, helical ribbon, electroless deposition, nanoparticles and wires, composite microstructure.

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Two-dimensional thermoelasticity solution for functionally graded thick beams

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Science china(Physics,Mechanics & Astronomy) 2006年第4期49卷 451-460页

作者： Lü Chaofeng1, CHEN Weiqiu1 & ZHONG Zheng2.1. department of Civil Engineering, Zhejiang university, Hangzhou 31002., {2. 2. Key laboratory of solid Mechanics of Ministry of Education, School of Aerospace Engineering and Ap- plied Mechanics, Tongji university, Shanghai 2.0092. {2. department of Civil Engineering Zhejiang University Hangzhou 310027 China Key laboratory of solid Mechanics of Ministry of Education School of Aerospace Engineering Applied Mechanics Tongji University Shanghai 200092 China

Two-dimensional thermoelasticity analysis of functionally graded thick beams is presented using the state space method coupled with the technique of differential quadrature. material properties vary continuously and smoothly through the beam thickness, leading to variable coefficients in the state equation derived from the elasticity equations. Approximate laminate model is employed to translate the state equation into the one with constant coefficients in each layer. To avoid numerical instability, joint coupling matrices are introduced according to the continuity conditions at interfaces in the approximate model. The differential quadrature procedure is applied to discretizing the beam in the axial direction to make easy the treatment of arbitrary end conditions. A simply-supported beam with exponentially varying material properties is considered to validate the present method. Numerical examples are performed to investigate the influences of relative parameters.

关键词： state equation differential quadrature approximate laminate model joint coupling matrices thermal stresses.

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Organic thin-film solar cells:Devices and materials

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Science china Chemistry 2012年第4期55卷 553-578页

作者： LI ZhiGang1, ZHAO XinYan2. LI Xin1,2. GAO ZhiQiang1, MI BaoXiu1 & HUANG Wei2.1Jiangsu Engineering Centre for Flat-Panel Displays & solid-state Lighting and School of {2.s Science & Engineering, nanjing university of Posts & Telecommunications, nanjing 2.0046, china 2.ey laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced {2.s (IAM), nanjing university of Posts & Telecommunications, nanjing 2.0046, china 1. Jiangsu Engineering Centre for Flat-Panel Displays & solid-state Lighting and School of {2.s Science & Engineering Nanjing University of Posts & Telecommunications Nanjing 210046 China2. Key Laboratory for Organic Electronics & Information Displays (KLOEID) Institute of Advanced materials (IAM) Nanjing University of Posts & Telecommunications Nanjing 210046 China

In recent years, the performance of organic thinfilm solar cells has gained rapid progress, of which the power conversion efficiencies （r/p） of 3%-5% are commonly achieved, which were difficult to obtain years ago and are improving steadily now. The r/p of 7.4% was achieved in the year 2.10, and r/p of 9.2. was disclosed and confirmed at website of Mitsubishi Chemical in April, 2.11. The promising future is that the r/p of 10% is achievable according to simulation results. Apparently, these are attributed to material innovations, new device structures, and also the better understanding of device physics. This article summarizes recent progress in organic thinfilm solar cells related to materials, device structures and working principles. In the device functioning part, after each brief summary of the working principle, the methods for improvements, such as absorption increment, organic/electrode interface engineering, morphological issues, are addressed and summarized accordingly. In addition, for the purpose of increasing exciton diffusion efficiency, the benefit from triplet exciton, which has been proposed in recent years, is highlighted. In the active material parts, the chemical nature of materials and its impact on device performance are discussed. Particularly, emphasis is given toward the insight for better understanding device physics as well as improvements in device performance either by development of new materials or by new device architecture.

关键词： organic – solar cell – photovoltaic – devices – materials

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Deposition features of Ni on self-assembled microtubule template from biolipid by electroless method

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Science china Chemistry 2004年第3期47卷 228-234页

作者： FU Yubin1,2. ZHANG Lide1, ZHENG Jiyong2. FU Shangang3 & ZHU Mingwei3 1. Institute of solid state Physics, Chinese Academy of Sciences, Hefei 2.0031, {2. 2. Luoyang Ship material Research Institute, Luoyang 471039, {2. 3. College of Life Science, Henan Normal university, Xinxiang 453002. {2. 1. Institute of solid state Physics Chinese Academy of Sciences 230031 Hefei China 2. Luoyang Ship material Research Institute 471039 Luoyang China 3. College of Life Science Henan Normal University 453002 Xinxiang China

Diacetylenic glycero-phosphatidylcholine is a chiral molecule with amphiphilic property, and it can self-assembly into a lipid microtubular structure. The lipid microtubule is a stable structure formed by tightly wound helical ribbons, and the ribbon-wrapping patterns have a significant effect on their chemical deposition on the microtubules. The deposition of colloidal Pd catalyst occurs mainly on the helical edge of the wound helical ribbons to form helical deposition lines of colloidal Pd particles in the interior and exterior of the lipid microtubules, resulting in an uneven chemical deposition of Ni on the microtubules. Catalyzed by as-deposited colloidal Pd, metallized Ni microtubules are characterized by a helical form, which may be in relation to inner stress due to the thickness difference or the different deposition processes. The observation of microtom shows that metallized tubules have a hollow structure. Some metallized tubules have a kind of coaxial double layer structure observed in the direct experiment evidence, indicating that metallization can occur in the inner and outer surface of the lipid tubules. Both lipid microtubules and metallized microtubules can be used as vehicles for encapsulating biological active molecules to control their release and to develop micro-components in biological and mechanical systems. Keywords molecular self-assembly - lipid microtubules - helical pattern - site-specific deposition - electroless metallization

关键词： molecular self-assembly, lipid microtubules, helical pattern, site-specific deposition, electroless metallization.

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FERROELECTRIC CHARACTERISTICS OF SrBi_2.a_2._9 THIN FILMS ANNEALED IN FORMING GAS

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Acta Metallurgica Sinica(English Letters) 2001年第6期14卷 517-519页

作者： D.S. Wang, T. Yu and A. Hu (department of Physics & National {2. of solid state microstructures, nanjing university, nanjing 2.0093, china) D. Wu, A.D. Li, Z.G. Liu and N.B. Ming (department of material Science and Engineering & National {2. department of material Science and Engineering & N{2. laboratory of solid state microstructures Nanjing University

The degradation behavior of SrBi2.a2.9 (SBT) thin films annealed in forming gas (5%H2.95%N2. was investigated. The ferroelectric remnant polarization Px of SBT had a severe decrease in the containing H2.atmosphere at 400°C. SEM results showed that Bi could be reduced from SBT thin films for the effect of H2. The reduction role increased with a rise of annealing temperature. SBT thin films lost their ferroelectricity when the annealing temperature was above 450°C. It implied that the degradation of Pr value or the disappearance of ferroelectricity in SBT thin, films had the relationship with the reductive amounts of Bi in SBT. H2.played an important role in degradation of ferroelectric SBT thin films. This role could be attributed to its strong reduction activity during forming gas annealing.

关键词： Annealing Degradation Ferroelectricity Thermal effects

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Separation of Red (Y_2._3:Eu^(3+)), Blue (BaMgAl_(10)O_(17):Eu^(2.)) and Green (CeMgAl_(10)O_(17):Tb^3) Rare Earth Phosphors by Liquid/Liquid Extraction

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Journal of Wuhan university of Technology(materials Science) 2009年第4期24卷 603-607页

作者：梅光军 School of Resource and Environmental Engineering Wuhan University of Technology

A novel process for separation of red （Y2.3：Eu^3＋）, blue（BaMgAl10O17：Eu^2.） and green （CeMgAl10O17：Tb^3） rare earth fluorescent powders was proposed. At first, the blue powder can be extracted selectively from an aqueous solution using a chelating collector 2.thenoyltrifluoroacetone （TTA） dissolved in heptane at alkaline pH condition, then, chloroform was used for extracting the green powder into organic phase. The red phosphor remains in aqueous phase with potassium sodium tartrate depressant （PST）. Therefore, three phosphors can be separated successfully from their artificial mixtures by liquid/liquid extraction, and grades and recovery of separated products reach respectively as follows： red is 96.9% and 95.2., blue is 82.7% and 98.8%, green is 94.6% and 82.6%.

关键词： rare earth phosphor solid-solid separation liquid/liquid extraction

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Effects of NaNbO_3-Co_2._3 Co-additive on the Properties of PZN-PZT Ceramics

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Journal of Wuhan university of Technology(materials Science) 2007年第4期22卷 722-724页

作者：邓毅华 College of material Science and Engineering South China University of Technology department of Electronic Science and Technology Huazhong University of Science and TechnologyWuhan 430074China

NaNbO3-Co2.3 co-added PZN-PZT （PZCNNT） ceramics were prepared using conventional solid state reaction. The piezoelectric and dielectric properties were measured. The experimental results show that the addition of 0.3mo1% Co2.3 leads to low dielectric loss （tgδ） in PZCNNT ceramics and the proper addition of NaNbO3 not only improves piezoelectric properties but also decreases intensively dielectric loss and mechanical loss. The optimal ceramic having d33=310 pC/N, kp=0.59, εr=985, tgδ=0.0034, Qm=1380 was obtained.

关键词： PZN-PZT piezoelectric constant dielectric constant dielectric loss

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稀土Gd_5Ge_2.Si_(2.x)Al_x)合金系的晶体结构和磁卡效应研究

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中国稀土学报 2003年第Z1期21卷 114-116页

作者：黄军平罗广圣唐少龙吴小山南昌大学材料科学与工程学院江西南昌330047 南京大学国家固体微结构实验室江苏南京210093

用磁控电弧炉在氩气气氛下熔炼了Gd5Ge2.Si2.xAlx)(x=0,0.1,0.2.0.5,1.0)系样品。X射线粉末衍射分析表明,样品基本为单相结构,其晶体对称性不会随Al含量的增加而改变。用振动样品磁强计测量了样品的M T曲线和不同温度下的M H曲线。居里... 详细信息

用磁控电弧炉在氩气气氛下熔炼了Gd5Ge2.Si2.xAlx)(x=0,0.1,0.2.0.5,1.0)系样品。X射线粉末衍射分析表明,样品基本为单相结构,其晶体对称性不会随Al含量的增加而改变。用振动样品磁强计测量了样品的M T曲线和不同温度下的M H曲线。居里温度随Al含量x的增加略有减小,当x=0.2.Gd5Ge2.Si2.xAlx)有最大-ΔSM值。退火对样品的居里温度和磁卡效应影响不大,退火前后的居里温度和磁卡效应基本保持一致。

关键词：磁热效应磁熵变晶体结构居里温度稀土

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