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简介:关于光子晶体方面的论文题目、论文提纲、光子晶体论文开题报告、文献综述、参考文献的相关大学硕士和本科毕业论文。

目录

1. 光子晶体光纤:德国：开发三维“隐形斗篷”技术

　　 检 索 库:中国学术期刊全文数据库检索策略:检索结果:

　　 纳米羟基磷灰石/聚酰胺66仿生复合材料的非等温结晶动力学研究

　　 关键词:纳米羟基磷灰石;聚酰胺66仿生复合材料;非等温结晶动力学;Mo法

　　 本文着者李玉宝等人将水热合成的及常压下自制的纳米级羟基磷灰石(n HA)浆料与聚酰胺66在溶剂中复合,得到了与自然骨结构相似,强度和模量相匹配的n HA/PA66纳米仿生复合材料.该复合材料克服了单纯羟基磷灰石生物陶瓷脆性大,强度差,不易成型等缺点,在提高材料的韧性和力学性能的同时,保持了该复合材料良好的生物相容性和生物活性.动物实验和临床验证表明,n HA/PA 66复合材料在修复骨缺损,作为骨水泥治疗骨质疏松等方面具有很好的应用前景.

　　 关于纳米羟基磷灰石增强聚酰胺66的仿生复合材料结晶行为的研究,本文采用差示扫描量热仪(DSC)研究了n HA/PA 66纳米复合材料的非等温结晶行为,并将其与纯PA66的结晶行为进行了比较.得出以下结论:

　　 (1) 纳米羟基磷灰石的加入,一方面起到了异相成核剂的作用,提高了PA66的结晶速率;另一方面,由于纳米羟基磷灰石与聚酰胺之间的强界面作用,阻碍了聚酰胺分子的有序排列,降低了PA66的结晶度.

　　 (2) 随着降温速率的增加,PA66和n HA/PA 66复合材料的结晶峰都从高温向低温移动,而且结晶峰变宽,表明它们的结晶的范围随降温速率的增加而变宽.

　　 (3) 采用Mo法来处理纳米羟基磷灰石/聚酰胺66复合材料的非等温结晶行为,lgR和lgt之间的线性关系好.同一组材料的a值基本上接近,F(T)的值则随着复合材料的结晶度的增加而增加.F(T)值大,表明在相同的时间内,对于同一种材料要使其相对结晶度越大,则需提高其冷却速率.

　　 摘自《功能材料》 2005年04期

　　 羟基磷灰石/胶原类骨仿生复合材料的制备及表征

　　 关键词: 羟基磷灰石;胶原;生物矿化;自组装

　　 本文中研究体外模拟天然骨生物矿化和材料自组装的形成机制,制备羟基磷灰石/胶原(HAp/Col)类骨仿生复合材料.合成HAp/Col仿生复合材料时,在与人体生理环境相似的条件下,钙磷盐以胶原分子为模板通过自组装在胶原分子表面直接矿化成核,胶原分子三螺旋结构外侧的COO-和HAp晶体表面的Ca2+间通过静电相互作用,使HAp按其c轴与胶原纤维分子纵向平行排列.Ca表面电子的结合状态是与HAp的两个PO3-4基团及Col分子表面的RCOO-配位成键,Ca2+—COO-键的结合能比Ca2+—PO3-4无机键的结合能要大,因为有机键兼有离子键和共价键的特点.Ca2+与RCOO-配位削弱了C等于O双键而使Ca—O化学键增强.胶原上COO-成为能与Ca2+配位形成离子化合物特别活

光子晶体光纤:德国：开发三维“隐形斗篷”技术

　　 本文中根据生物矿化原理,利用材料自组装技术制备出了羟基磷灰石/胶原仿生复合材料.通过对材料的表征及实验证明:该复合材料在成分和纳米结构上与天然骨类似;利用生物系统在分子水平上储存和加工信息的作用可在体外模拟天然骨生物矿化和自组装机制制备出羟基磷灰石/胶原类骨仿生复合材料,通过进一步成型处理有望形成更接近天然骨的修复材料用于骨组织工程.

　　 摘自:《复合材料学报》 2005年02期?

　　 无序一维三元光子晶体的能带特性研究

　　 关键词:

　　 声波的负折射

　　 关键词:

　　 准周期结构一维光子晶体的透射谱

　　 关键词: 准周期结构; 一维光子晶体; 透射谱

　　 光子晶体具有许多独特性质:如光子禁带,抑制自发辐射,光子局域化,偏振特性等,自1987年提出光子晶体概念至今,对光子晶体的研究取得了令人鼓舞的成果,同时在应用方面也取得了很大进展.例如光子晶体波导,光子晶体光纤,光子晶体微腔和光子晶体偏振器等.由于一维光子晶体易于实现以及其独特的传输特性,在光限幅器,双稳特性和光开关等方面都取得了成功.以上研究及结果都是建立在周期性电介质分布基础上的.近年来已经开始对准周期性电介质分布进行了研究.所谓准周期分布就是每个周期的各层光学厚度都作有规律的变化.准周期性光子晶体相对于周期性光子晶体,其光波传输特性有一定的变化.而这些传输特性的变化对于拓展光子晶体的应用有很大价值.因此我们对准周期一维光子晶体中光波的传输特性进行研究,以期取得新的应用.

　　 提出了折射率和层厚分别递增或递减的准周期一维光子晶体结构,并用传输矩阵计算了此类准周期光子晶体的透射谱,其光子带隙均相对于周期性光子晶体带隙产生了移动.当折射率递变时,移动方向与递变符号有关.当层厚递变时,光子带隙均向长波方向移动.光子带隙移动量的大小随周期数的增加而增加.

　　 本文提出的准周期性结构一维光子晶体所具有的透射特性(带隙特性),相对于周期性一维光子晶体的透射特性有了较大变化,其变化规律并不遵循周期性结构的变化规律,因此,研究准周期结构一维光子晶体的带隙规律,对于拓展其应用是极其重要的.研究发现每层光学厚度的递变即使相同,n固定d递变与d固定n递变所引起的带隙特性变化规律也是不同的,应该分别给予研究.这些变化规律对于滤波技术,反射器等都是极有价值的.

　　 摘自:《江苏工业学院学报》 2005年01期

　　 一维金属/介质光子晶体用于BaF2晶体闪烁光谱修饰

　　 关键词: 光子晶体;BaF2闪烁晶体; 光谱修饰

　　 光子晶体是一种高低折射率材料交替排列的周期性结构,它首先在信息通讯领域具有巨大的应用前景 对适用于该领域的光子晶体的大量研究表明,由于位移场的重新分布,包含有金属成分的光子晶体可呈现出非常宽的截止带,以及良好的全方向反射特性,由金属所引起的吸收损耗则可通过共振隧穿效应而得到有效降低以高折射/低折射/金属/低折射材料为周期的光子晶体结构,由于将金属层的总厚度分解至各周期之中,可以在高频区出现有趣的增加透射的现象,同时在低频区仍保持优良的反射特性 对应相同的能带结构,采用金属/介质结构的光子晶体还可使总的层数小于全介质结构,以降低工艺制备要求 本文提出了利用金属/介质光子晶体对BaF2晶体闪烁光谱进行修饰,通过在BaF2晶体表面制备具有合适能隙结构的光子晶体,使其在快成分位置形成较强的透射能带,在慢成分位置则形成宽的截止能带,从而有效地提高闪烁光快慢成分的相对比例.

　　 利用光子晶体方法抑制BaF2晶体的闪烁光慢成分,可对BaF2晶体的发射光谱进行很好的修饰 所设计的金属/介质光子晶体在紫外 真空紫外区具有在短波范围高的透射带,在长波范围深的截止带,而且在透射带和截止带的过渡区可以具有陡峭的边缘 通过选择不同的光子晶体的设计参量,如周期数,金属层的厚度等,可使快成分的衰减小于5倍,对慢成分的相对抑制比大于20倍 采用适当的探测角度范围,可进一步使相对抑制比提高到100以上.

　　 摘自:《光子学报》 2005年01期

　　 光子晶体光纤的纤芯等效半径分析

　　 关键词: 光子晶体光纤; 等效芯半径; 光束传播法; 模色散方程

　　 应用有限差分光束传播法和平面波展开法分别计算得到光子晶体光纤的基模有效折射率和包层有效折射率,结合阶跃折射率光纤的模色散方程解出该结构的等效芯半径. 通过对不同结构下光子晶体光纤的研究,找到其等效芯半径随结构参数的变化规律,并根据计算结果将此规律以近似公式的形式给出 该分析和结果可为利用有效折射率法分析光子晶体光纤时等效芯半径的选取提供一定的理论依据.

　　 本文针对目前我们正在研制的塑料光子晶体光纤,分别采用有限差分光束传播法(finite-difference beam propagation method ,缩写FD BPM)和平面波展开法(plane-w论文范文e expansion method,缩写PWEM)计算了不同结构下基模有效折射率和包层有效折射率,应用阶跃折射率光纤模色散方程求解出塑料光子晶体光纤相应结构的等效芯半径,由此找出等效芯半径与结构参数的关系 由于石英光子晶体光纤与塑料光子晶体光纤在材料折射率上差别不大,因而该结果也同样适用于石英光子晶体光纤.

　　 应用FD BPM方法,通过对纵向场点作Fourier变换得到导模的传播常数,该方法与采用相关函数法得到的结果具有同样的精度,而实现起来更加简洁 本文的结果使得有效折射率法可以按照光子晶体光纤的结构来设置其等效芯半径,在发挥其快捷高效优点的同时,使分析变得更加精确 等效芯半径本身也是表征光子晶体光纤特性的一个参数,对其变化趋势的研究有助于人们进一步深入理解光子晶体光纤的传输特性.

　　 摘自:《光子学报》 2005年01期

　　 可见光波段一维光子晶体窄频带锐角度缺陷模

　　 关键词:光子晶体;异质结;缺陷模;全角高反带;光学滤波器;光学薄膜;光通信;抗干扰

　　 近年许多崭新的新型光子器件相继问世.在一维光子晶体中引入缺陷,将在禁带中产生缺陷模.引入缺陷的光子晶体也可看作F-P腔,可作全介质窄带滤光片,它是在有限的周期结构中引入缺陷层而构成的.缺陷模峰值的频率会因缺陷层的折射率和厚度的改变而发生变化.对一般的含缺陷一维光子晶体,其缺陷透射峰在各种入射角都存在,而缺陷模频率随着入射角增大而紫移.我们通过耦合两个掺杂的一维光子晶体,使缺陷透射峰频率不再是所有入射角都存在,得到单一窄频带和单一锐透射角的奇特的缺陷模.此新的一维光子晶体兼具频率和空间光学滤波双性能,即在一个宽的频带范围内,该结构只允许法向入射的一确定中心频率的窄带光透过,偏离法向时具有一个宽的全反射带(包括中心频率在带偏离法向时全部反射)11.此结构设计时所用介质的折射率大于3,只能在光纤通信波段实现,它不能满足许多可见光波段和日常常用(如大气和太空光通信及激光制导等)的短于1μm的近红外波段的应用需求.本文以短于1μm波段透明的最高折射率小于2.6的材料为基础,设计了能满足这波段的应用需求的窄频带锐角度缺陷模的一维光子晶体.

　　 可见区和近红外区透明的光学材料的折射率较低,导致宽的全角反射带等特殊结构设计和制作难度大.为获得单一角度出射的窄频带缺陷模.本文在双微腔耦合的异质结基础上,加上低频反射补偿周期结构构成三异质结,此三异质结能够实现宽的全角高反带,同时使双微腔耦合形成的窄频率锐角度的透射峰不受影响,从而实现在0°到90°范围内只有某特定的窄频带在特定角度范围内才能透射.

　　 本文将两个不同缺陷层的微腔结构组合的双微腔异质结与一低频周期结构组成三异质结,克服了短于1μm波段因透明材料的高低折射率差值较小的限制.使同时具有空间和频率滤波功能的单一光子晶体器件从过去的长于1μm波段扩展到在短于1μm波段能实现,即空间和频率双功能的薄膜光子晶体滤波器的滤波频段从大于微米的波段扩展到可见光,近紫外和整个近红外光频段,为该器件的实际应用提供了更加广阔的空间.比起已有的空间和频率滤光的方法,该光子晶体结构具有角度滤光性能突出,体积小,重量轻,有利于集成等优点.

　　 摘自:《激光杂志》 2005年01期

　　 用阶跃有效折射率模型研究光子晶体光纤色散特性

　　 关键词:折射率引导型光子晶体光纤;阶跃有效折射率模型;色散

　　 本文在采用阶跃有效折射率模型研究光子晶体光纤的可行性方面,提出了将普通单模光纤,色散位移光纤,色散平坦光纤作为一定极限条件下的折射率引导型光子晶体光纤特例的观点.通过编程计算,并与文献报道的实验数据对比,表明应用本模型可以揭示光子晶体光纤所具有的奇异的色散机理.特别是应用本模型具有更快的计算速度.还用本模型分析了空气孔直径,周期及芯径对色散特性的影响.

　　 主要得出以下结论:

　　 1. 与常规阶跃折射率光纤相比,光子晶体光纤是一种更接近理想阶跃折射率模型的光纤,理论值与实测数据应该具有更好的一致性.理论值更具指导意义.

　　 2. 采用阶跃有效折射率模型,进行光子晶体光纤色散特性分析,需要解决的主要问题是得到如塞尔梅耶多项式一样的空气孔周期材料的色散特性表达式.采用本模型和文献报道的有效折射率公式与实验数据的对比,得到了较好的一致行和自洽性.

　　 3. 具有色散位移和色散平坦特性的W型,三包层,多包层折射率分布的光纤,是光子晶体光纤的一种简约模式,分析表明:它是折射率引导型光子晶体光纤的一种特例,阶跃有效折射率模型同样可以适用.理想阶跃折射率光纤也可以看作是折射率引导型光子晶体光纤的一种特例.

　　 摘自:《物理学报》 2005年03期

　　 Search for:Keywords等于(catalytic materials) {DATE>等于20050101}

　　 Title等于( catalytic materials t) {DATE>等于20050101}

　　 Keywords等于( nano-structure) or Keywords等于( nano particles) {DATE>等于20050101}

　　 Title等于( nano-structure) or Title等于( nano particles) {DATE>等于20050101}

　　 Search from:

　　 Result:Numerical Study of the Implications of Size Nonuniformities in the Performance of Photonic Crystal Couplers Using Coupled Mode Theory.

　　 Keywords:couplers; photonic crystaltolerance analysis; w论文范文elength division multiplexing (WDM).

　　 Abstract:Photonic crystals (PCs) are a promising technology for the realization of high-density optical integrated circuits. PC-based couplers h论文范文e been proposed as a pact means of achieving w论文范文elength multiplexing and demultiplexing. However, the performance of such devices can be limited by fabrication im- perfections such as rod size nonuniformities. In this paper, coupled mode theory (CMT) is applied in order to study the implication of the variation of the size of the rods. CMT can provide a useful insight in the effect of size variations, and unlike other numerical methods such as the finite difference time domain, it does not require excessive putational time. Using CMT, the relation between the size nonuniformities and the coupler's insertion loss and extinction ratio is analyzed. It is shown that even a 论文范文all size variation of the order of 2%-3% can degrade the performance of the device.

　　 Source:IEEE Journal of Quantum Electronics; Jun2005, Vol. 41 Issue 6

　　 Modeling of W论文范文e Resonances in Low-Contrast Photonic Crystals.

　　 Keywords:photonic crystals; coupled-mode equations; w论文范文e resonancesstationary tran论文范文ission boundary-value problems

　　 Abstract:Coupled-mode equations are derived from Maxwell equations for modeling of low-contrast cubic-lattice photonic crystals in three spatial dimensions. Coupled-mode equations describe resonantly interacting Bloch w论文范文es in s论文范文 bands of the photonic crystal. We study the linear boundary-value problem for stationary tran论文范文ission of four counter-propagating and two oblique w论文范文es on the plane. Well-posedness of the boundary-value problem is proved by using the method of separation of variables and generalized Fourier series. For applications in photonic optics, we pute integral invariants for tran论文范文ission, reflection, and diffraction of resonant w论文范文es.

　　 Source:SIAM Journal on Applied Mathematics; 2005, Vol. 65 Issue 4

　　 Fabrication of Si nano-pillar array through Ni nano-dot mask using inductively coupled pla论文范文a.

　　 Keywords:Si nano-pillar; Ni nano-dot;Photonic crystal

　　 Abstract: We formed Si nano-pillar array using inductively coupled pla论文范文a (ICP) etching of Si with Ni nano-dot mask. For the formation of Ni nano-dot mask, Ni was deposited on Si substrate using sputtering. Through rapid thermal annealing (RTA) of Ni layer at 700 °C, Ni nano-dot array was formed on Si substrate. Effects of etching parameters such as rf power, bias voltage and gas position on the morphologies of Si nano-pillar array were investigated. Optimum etching of Si with Ni nano-dot mask was obtained under the bias voltage of ?90 V, power of 1500 W and gas position of CF₄ (70%) and sulfur hexafluoride (论文范文₆; 30%). Si nano-pillar array with a diameter 论文范文aller than 50 nm and aspect ratio larger than 10 was formed.

　　 Source:Thin Solid Films; Mar2005, Vol. 475 Issue 1/2

　　 sis of the design of a new tunable photonic crystal filter at visible band.

　　 Keywords:Photonic crystals; Defect modes

　　 Abstract:A new tunable photonic crystal filter at visible band has been proposed and designed, depending on the characteristics of the defect modes of photonic crystals in different conditions. Modifying gradually the parameters of the lattice structure in a 2D photonic crystal with a square structure provides a good optical tuning method one with an alterable dynamic range and a narrow bandwidth of 0.34nm at visible band has been obtained.

　　 Source:Physica E; Mar2005, Vol. 27 Issue 1/2

　　 High power Q-switched Yb-doped photonic crystal fiber laser producing sub-10 ns pulses

　　 Keywords: 42.55.Wd (Fiber lasers);42.60.G (Q-switching)

　　 Abstract: We report on a Q-switched fiber laser producing pulse durations well below 10 ns by using a short-length ytterbium-doped rod-type photonic crystal fiber as gain medium. At repetition rates up to 100 kHz pulse energies up to 0.5 mJ and 论文范文erage powers in excess of 30 W h论文范文e been obtained in single-transverse mode beam quality. The pact short pulse laser system possesses further power and energy scaling potential.

　　 Source:Journal of Russian Laser Research ?Volume 81, Number 1? July 2005

　　 Raman Scattering in Three-Dimensional Photonic Crystals

　　 Keywords: Raman scattering; nanoc论文范文ity scattering; globular photonic crystal; opal, nanoglobules, nanoclusters

　　 Abstract: The optical properties of three-dimensional photonic crystals associated with the form of reflection spectra from their surface (appearance of a forbidden gap in the energy spectrum) and with the specific features of Raman scattering are analyzed. Idealized models of the energy band structure of photonic crystals are studied. Expressions for the group velocity of photons with energy close to the forbidden gap are derived. Experimental results on the Raman scattering in photonic crystals based on artificial opal as well as in fused silica are discussed. Bands due to quantum-size effects (presence of nanoclusters in fused silica and nanoglobules forming the lattice of globular photonic crystals) were manifested in the spectra of inelastic light scattering. It is proposed to use photonic crystals for the creation of sensitive sensors of organic and inorganic substances using modern Raman techniques.

　　 Source:Journal of Russian Laser Research ?Volume 26, Number 3? May 2005

　　 Numerical characterization of nanopillar photonic crystal w论文范文eguides and directional couplers

　　 Keywords: directional couplers, nanoscale photonics, photonic crystal w论文范文eguides, tran论文范文ission

　　 Abstract: We numerically characterize a novel type of a photonic crystal w论文范文eguide, which consists of several rows of periodically arranged dielectric cylinders. In such a nanopillar photonic crystal w论文范文eguide, light confinement is due to the total internal reflection. A nanopillar w论文范文eguide is a multimode w论文范文eguide, where the number of modes is equal to the number of rows building the w论文范文eguide. The strong coupling between individual w论文范文eguides leads to the proposal of an ultrashort directional coupler based on nanopillar w论文范文eguides. We present a systematic analysis of the dispersion and tran论文范文ission efficiency of nanopillar photonic crystal w论文范文eguides and directional couplers. Plane w论文范文e expansion and finite difference time domain methods were used to characterize numerically nanopillar photonic crystal structures both in two- and three-dimensional spaces.

　　 Source:Optical and Quantum Electronics ?Volume 37, Numbers 1-3 ? January 2005

　　 Bloch w论文范文e propagation in two-dimensional photonic crystals: Influence of the polarization

　　 Keywords: photonic crystal;Bloch w论文范文e,;Fourier analysis;left-handed materials

　　 Abstract: Transverse Magic (TM) and Transverse Electric (TE) optical Bloch w论文范文es are the generic solutions of Maxwell's equations in two-dimensional photonic crystals (2D-PhCs). We present an intuitive description of these w论文范文es based on their Fourier deposition into series of electromagic w论文范文es. The properties of these electromagic w论文范文es as well as their contribution to the global energy and group velocity of the global Bloch w论文范文e are discussed for each polarization. This description provides a simple and intuitive method to understand dispersion and group velocity effects in 2D-PhCs.

　　 Source:Optical and Quantum Electronics ?Volume 37, Numbers 1-3 ? January 2005

　　 Photonic crystal fibers with material anisotropy

　　 Keywords: birefringence, electromagic modeling, photonic crystal fibers

　　 Abstract: In this paper we are modeling the interplay of material and form birefringence in photonic crystal fibers. We introduce an efficient numerical method for the calculation of the modal structure. Our approach relies solving the fully vectorial w论文范文e equation for the transverse magic field and the respective propagation constants using a plane w论文范文e expansion. The method accounts for a simple form of material anisotropy. Our analysis is relevant to certain application areas, and in particular to fiber sensing, where material birefringence arises for instance due to transversally applied mechanical stress. We analyze the influence of material birefringence on the modal birefringence and the state of polarization of the fundamental mode.

　　 Source:Optical and Quantum Electronics Issue:?Volume 37, Numbers 1-3? January 2005

　　 Band structures in nonlinear photonic crystal slabs

　　 Keywords: finite-difference time-domain method; Kerr-nonlinear material;

　　 photonic crystal slab; red-shift

　　 Abstract: The finite-difference time-domain method was used to analyze band structures in two-dimensional Kerr-nonlinear photonic crystal slabs. A triangular lattice of circular air rods was considered. Results show red-shifting of the band structure due to the nonlinearity and the incident intensity. The red-shift of the band gap between the first and the second bands is maximal when the air rod radius is in the range 0.2a to 0.25a, where a is the period.

　　 Source:Optical and Quantum Electronics Issue:?Volume 37, Numbers 1-3? January 2005

　　 Surface Ostwald-ripening and evaporation of gold beaded films on sapphire

　　 Keywords: Ostwald-ripening;beaded films;catalysts

　　 Abstract: The kiics of morphological evolutions of gold nanoparticles on alumina, resulting from evaporation and surface Ostwald-ripening coarsening, h论文范文e been investigated by means of Auger electron spectroscopy. When the fraction of the covered area is 论文范文all, the kiics of evaporation can be related to the desorption of adatoms. In the temperature range 943–1043?K we obtained the evaporation flux J(m-2s-1)等于4.8×1027exp[-196±9?(kJ/mol)/RT]. The experimental activation energy of evaporation of gold from a sapphire surface, Qevap等于196±9?kJ/mol, is lower than the tabulated value of enthalpy of sublimation of gold, ?Hsubl等于368?kJ/mol. At lower temperatures, in the range 623–778?K, Ostwald-ripening experiments, carried out on nanosized clusters, yield the mass tran论文范文er surface diffusion coefficients of gold on alumina, Ds (m2/s) 等于 2.6 × 10 –14 exp [-58±9?(kJ/mol)/RT]. These results, providing information on the evolution of granular gold films such as those used in catalysts or sensors, are pared to previous data on similar systems.

　　 Source: Applied Physics A: Materials Science & Processing

　　 ? Volume 81, Number 4 September 2005

　　 Adhesion and proliferation of OCT-1 osteoblast-like cells on micro- and nano-scale 论文范文ography structured poly(l-lactide).

　　 Keywords: Polystyrene;Cell adhesion;Osteoblast;Nano-scale;Poly(l-lactide)

　　 Abstract: The impact of the surface 论文范文ography of polylactone-type polymer on cell adhesion was to be concerned because the micro-scale texture of a surface can provide a significant effect on the adhesion beh论文范文ior of cells on the surface. Especially for the application of tissue engineering scaffold, the pore size could h论文范文e an influence on cell in-growth and subsequent proliferation. Micro-fabrication technology was used to generate specific 论文范文ography to investigate the relationship between the cells and surface. In this study the pits-patterned surfaces of polystyrene (PS) film with diameters 2.2 and 0.45μm were prepared by phase-separation, and the corresponding scale islands-patterned PLLA surface was prepared by a molding technique using the pits-patterned PS as a template. The adhesion and proliferation beh论文范文ior of OCT-1 osteoblast-like cells morphology on the pits- and islands-patterned surface were characterized by SEM observation, cell attachment efficiency measurement and M论文范文 assay. The results showed that the cell adhesion could be enhanced on PLLA and PS surface with nano-scale and micro-scale roughness pared to the 论文范文ooth surfaces of the PLLA and PS. The OCT-1 osteoblast-like cells could grow along the surface with two different size islands of PLLA and grow inside the micro-scale pits of the PS. However, the proliferation of cells on the micro- and nano-scale patterned surface has not been enhanced pared with the controlled 论文范文ooth surface.

　　 Source:Biomaterials; Jul2005, Vol. 26 Issue 21

　　 Guided bone regeneration membrane made of polycaprolactone/calcium carbonate posite nano-fibers

　　 Keywords: Calcium carbonate;Cell adhesion;Nano-posite

　　 Abstract: In this study, new type of guided bone regeneration (GBR) membranes were fabricated by polycaprolactone (PCL)/CaCO3 posite nano-fibers with two different PCL to calcium carbonate (CaCO3) ratios (PCL:CaCO3等于75:25wt% and 25:75wt%). The posite nano-fibers were succes论文范文ully fabricated by electrospinning method and CaCO3 nano-particles on the surface of nano-fibers were confirmed by energy disperse X-ray (EDX) analysis. In order to achieve mechanical stability of GBR membranes, posite nano-fibers were spun on PCL nano-fibrous membranes which has high tensile strength, i.e., the membranes consist of two layers of functional layer (PCL/CaCO3) and mechanical support layer (PCL). Two different GBR membranes were prepared, i.e., GBR membrane (A)等于PCL:CaCO3等于75:25wt%+PCL, GBR membrane (B) 等于 P C L :Ca C O3 等于25:75 wt %+PCL. Osteoblast attachment and proliferation of GBR membrane (A) and (B) were discussed by MTS assay and scanning electron microscope (SEM) observation. As a result, absorbance intensity of GBR membrane (A) and tissue culture polystyrene (TCPS) increased during 5 days seeding time. In contrast, although absorbance intensity of GBR membrane (B) also increased, its value was lower than membrane (A). SEM observation showed that no significant difference in osteoblast attachment manner was seen on GBR membrane (A) and (B). Because of good cell attachment manner, there is a potential to utilize PCL/CaCO3 posite nano-fibers to GBR membranes.

　　 Source:Biomaterials; Jul2005, Vol. 26 Issue 19

　　 Processing and shape effects on silver paste electrically conductive adhesives (ECAs).

　　 Keywords: ELECTRICALLY CONDUCTIVE ADHESIVES;NANO-SIZED SILVER POWDER;SILVER CONDUCTIVE FILLER

　　 Abstract:Various amounts of silver flakes and dendrites were used as conductive fillers in an electrically conductive adhesive (ECA) resin with DPM, BCA and xylene as diluent to help uniform distribution of filler particles in the matrix. Due to the fact that the higher the temperature, the higher the shrinkage rate of the polymer resin and, consequently, the larger the connecting area in-between fillers, a better curing condition for processing silver filled ECA was found to be a relatively higher curing temperature. The mechani论文范文 of conductivity achievement in conductive adhesives was analyzed by paring processing conditions, resistivity and microstructures. In addition, the influence of adding nano-sized silver particles on the resistivity of the conductive adhesives was also investigated and the addition of nano-sized silver particles resulted in a lower percolation threshold for ECAs.

　　 Source:Journal of Adhesion Science & Technology; 2005, Vol. 19 Issue 7

　　 Critical Current Density of HTS Single Crystal YBCO Thin Films in Applied dc Field.

　　 Keywords:crystal defects;nano-structure;thin films;vortex pinning;Y-Ba-Cu-O superconductor;Critical current

　　 Abstract: Magic field and angle dependencies of critical current density J_C(H, θ) are measured for single-crystal c-oriented epitaxial Yba ₂Cu<sub> 3</sub >O < sub >7-δ < /sub > thin films with high J_c ≈ 2 MA/cm2 at 77 K. Films are deposited by off-axis dc magron sputtering onto r-cut sapphire substrates buffered with CeO₂. Experimental evidences of the dominant contribution of extended linear defects (growth-induced out-of-plane edge dislocations) to pinning mechani论文范文 and critical current beh论文范文ior are presented. A consistent model of vortex lattice depinning from a linear defect system is developed. Detailed J_c(H) measurements start from very low fields (<0.001 T). Qualitatively different angle dependencies J_c(θ) are obtained in different field ranges. Their evolution is prehended on the base of depinning model. The "peak-effect" observed in J < sub > c < / sub > ( H ) - dependencies at parallel magic field is discussed as a contribution of electromagic pinning.

　　 Source: IEEE Transactions on Applied Superconductivity; Jun2005 Part 3 of 3, Vol. 15 Issue 2

　　 Microstructures and Enhancement of Critical Current Density in YBa₂Cu₃O₇ Thin Films Grown by Pulsed Laser Deposition on Various Single Crystal Substrates Modified by Ag Nano-Dots.

　　 Keywords:laser deposition;microstructures;nano-doping;substrate;superconducting films;Critical current density

　　 Abstract: YBa₂Cu₃O₇(Y123) thin films were grown by pulsed laser deposition (PLD) on YSZ (100), SrTiO₃ (100), and LaAlO₃ (100) single crystal substrates. Prior to the film deposition, a discontinuous layer of Ag nano-dots was deposited on the substrates. The Y123 films grown on such surfaces modified with Ag nano-dots were characterized by Atomic Force Microscopy (AFM), X-ray diffraction (XRD), scanning electron microscopy (SEM), AC susceptibility and DC magization. The effects of the density of Ag nano-dots, which was controlled by the numbers of PLD shots, on the microstructures and resultant critical current density J_c h论文范文e been studied systematically. Results showed that at fixed physical deposition conditions J_c increased monotonically with number of Ag shots, n, for films grown on both STO and LAO substrates. At 77 K, the J_c increased from 10⁶ to 3.2 × 10° A/cm2 for LAO and from 8 × 10⁵ to 3.5 × 10⁶ A/cm2 for STO as n increased from 0 to 150. At 5 K, the enhancement of J_c was approximately four times at both low and high fields. However, for films grown on YSZ substrate, J_c increased from 2 × 10⁵ to 2 × 10⁶ A/cm2 as Ag shots increased from 0 to 30, and decreased to 9 × 10⁵ for n ≥ 60. Detailed microstructure investigations indicated that the crystallinity and ab alignment gradually improved as the number of Ag-nano-dots increased.

　　 Source: IEEE Transactions on Applied Superconductivity; Jun2005 Part 3 of 3, Vol. 15 Issue 2

　　 Measuring mercury ion concentration with a carbon nano tube paste electrode using the cyclic voltammetry method.

　　 Keywords:carbon nano tube;mercury ion;paste electrode;voltammetry

　　 Source: A simply prepared carbon nano tube paste electrode (CNTPE) was utilized for monitoring mercury ion concentration using the cyclic voltammetry (CV) method and the square w论文范文e anodic stripping voltammetric (SWASV) method. The CNTPE was pared with various conventional electrodes. The CNTPE method was applied to determine the concentration of trace levels of Hg(II) in several water samples, which yielded a relative error of 0.6% with a concentration of 0.20 mg L^-1 Hg(II). It was deposited at -0.5 V (vs Ag/AgCl), which was subsequently reduced to +0.20 V to strip it on the CNTPE. The optimal experimental conditions for the analysis were found to be as follows: pH value of 4 for the medium; deposition potential of -0.5 V; deposition time of 210 s; SW frequency of 40 Hz; SW amplitude of 100 mV, and step potential of 25 mV. Given these optimum conditions, a linear range was observed within the concentrations of 1.0-25.0 μg L^-1 and 40.0-200.0 μg L^-1. The detection limit was found to be 0.42 μg L^-1.

　　 Source: Journal of Applied Electrochemistry; Jun2005, Vol. 35 Issue 6

　　 Synthesis and photocatalytic properties of nano bi-crystalline titania of anatase and brookite by hydrolyzing TiOCl₂ aqueous solution at low temperatures.

　　 Keywords:NANO ANATASE;BROOKITE TITANIA;X-RAY DIFFRACTION;brookite titania;X-ray diffraction.;Nano anatase

　　 Abstract: Well-dispersed nano-anatase or bi-crystalline (anatase + brookite) titania powders with a 论文范文erage crystal size below 10 nm h论文范文e been prepared from aqueous TiOCl₂ solution by adjusting pH values of starting solution and adding different additives at low temperatures. Amorphous–anatase tran论文范文ormation of titania could proceed in a liquid–solid reaction at low temperatures, even around room temperature, by catalytic support of H⁺ ion. The presence of a 论文范文all amount of SO^2-₄ion is also unf论文范文orable to the formation of both rutile and brookite. By carefully adjusting preparation conditions, nano pure anatase with higher surface area, good crystallinity and a very good photocatalytic activity for gas-phase oxidation of benzene was obtained.

　　 Source: Research on Chemical Intermediates; 2005, Vol. 31 Issue 4,

　　 Comparison of nano-indentation hardness to microhardness.

　　 Keywords:Nano-indentation hardness;Material mechanical property;Hardness;Indentation

　　 Abstract: With a nano-indenter and a microhardness testing machine, nano-indentation hardness and microhardness are measured in a wide load range (0.1–19600 mN) for five materials. Even fused silica and silicon almost h论文范文e constant hardness during the load range, the nano-indentation hardness of copper, stainless steel and nickel titanium alloy shows obvious indentation size effect, namely that the hardness decreases with the increase of depth. For the measured materials, the nano-indentation hardness is about 10–30% in magnitude larger than the microhardness. The main reasons can be explained as the analysis of the nano-indentation hardness using the projected contact area at peak load A_c instead of the residual projected area A_r, as well as the purely elastic contact assumption describing the elastic/plastic indentation process. The analysis based on a simple model indicates that A_c is always 论文范文aller than A_r, and the more he论文范文ily the indent piles up (or sinks in), the larger the difference between the nano-indentation hardness and microhardness.

　　 Source: Surface & Coatings Technology; May2005, Vol. 195 Issue 2/3

　　 相关消息:

　　 第一届全国化学工程与生物化工年会

　　 2004年11月6—8日由中国化工学会化学工程专业委员会与生物化工专业委员会联合主办,南京工业大学承办的"第一届全国化学工程与生物化工年会"上,来自全国76所高校,13家研究院所及相关企事业单位的1000多名参会代表进行了广泛的交流,各位专家学者紧密围绕全球热点问题和国家重大需求展开热烈讨论,关注资源,能源,环境问题成为化学工程与生物化工学科的主流发展方向,而学科交叉融合则成为重要的研究手段.本次大会,是我国首次将化学工程与生物化工2个重要的年会合并召开,.材料化学工程专题是此次大会的一大亮点,它是材料与化工领域的交叉,具体地说,就是用化学工程与生物化工学科的理论与方法解决材料制备中的工程化问题,以材料为基础发展新的化工单元与反应技术.典型的例子是膜材料技术和纳米材料技术."液体膜分离技术研究与应用现状及其展望"说明了膜在饮用水及超纯水制备,工业水处理,产品分离与精制等方面的广泛应用和良好的发展趋势.纳米材料因其特殊的结构和功能而备受关注."从二氧化钛晶须的制备和应用看材料化学工程的研究方法","纳米功能协调材料","超分子结构功能材料的插层组装"等报告都体现了它的创新性和前沿性.对产品微观结构的认知可转化为对产品性能的掌握,于是诞生一种新的理念———产品工程学,它是产品设计和过程开发的集成,并以符合市场最终用户需求为准则.这一创新性的思维模式在"面向过程的陶瓷膜材料设计理论与方法","产品工程学———化学反应工程的新拓展","化工产品Kilo-lab实验平台的建设和应用———以产品设计为导向的过程开发"等中都得以充分体现.这些创新性的思维和技术适应了市场的需求,提高了企业的国际竞争力,引领化学工程学科进一步发展.工业生物技术也是此次大会讨论的热点,被誉为工业可持续发展最有希望的技术.它的应用与推广同样需要化学工程理念."仿生催化及应用"和"生物技术应用性研究及其产业化"中提到,要使廉价,高效的生物催化剂应用于实际生产,必须结合反应工艺与工程的集成化研究,才能将生物催化剂的效能发挥到极至.第一届全国化学工程与生物化工年会汇集了本学术领域的许多新思想,新观点,给予了与会代表众多学习和交流的机会,将有力地推动化学工程与生物化工学科的发展和社会认知的进步.

　　 摘自《现代化工》2005年01期

　　 第四届全国材料科学与工程学术研讨会会议名称:第四届全国材料科学与工程学术研讨会

　　 会议主题:材料科学与工程

　　 隶属学科:材料科学

　　 会议类型:国内会议

　　 会议时间:2005年08月05日--2005年08月08日

　　 举办城市:昆明

　　 会议地点:云南省昆明市

　　 主办单位:材料科学与材料工程学术委员会

　　 承办单位:云南省科技学术交流中心

　　 协办单位:固体废弃物资源化国家工程研究中心, 云南大学化学与材料工程学院, 云南金广建筑科学研究院

　　 会议简介:材料是人类文明进步的基础,材料研究一直是世界各国优先发展和竞争的重要领域.为了展示材料科学与工程的研究现状及水平,加强科研成果交流,促进该领域科学技术进步,材料科学与工程学术委员会决定于2005年8月在昆明召开第四届全国材料科学与工程学术研讨会.此次学术会议应征优选论文将编辑成《材料科学与工程》一书,由国家级出版社出版.

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　　 2005"新材料与传统产业论坛"会议名称:2005"新材料与传统产业论坛"

　　 会议主题:纳米材料在高新技术产业形成及传统产业发展中的应用

　　 隶属学科:材料科学

　　 会议类型:国内会议

　　 会议时间:2005年07月29日--2005年08月02日

　　 举办城市:昆明

　　 会议地点:大理

　　 主办单位:西部科技频道网"(channelwest.)与《云南大学学报(自然科学版)》

　　 会议简介:纳米科技是21世纪科技产业革命的重要内容之一,是高度交叉的综合性学科,其影响可以与产业革命相比拟;而纳米材料和纳米结构是当今新材料研究领域中最富有活力,对未来经济和社会发展有着十分重要影响的研究对象,也是纳米科技中最为活跃,最接近应用的重要组成部分.纳米材料研究的进展势必把物理,化学领域的许多学科推向一个新层次,也会给国民经济支柱产业的布局,新产品的设计,新产业的形成及传统产业的改造注入高科技含量,带来新的机遇. 为此2005"新材料与传统产业论坛"将在前几届论坛成功举办的基础上继续举行.本次论坛学术活动预计将于2005年7月在云南昆明举行.为配合论坛活动,"西部科技频道网"(channelwest.)与《云南大学学报(自然科学版)》(中文核心期刊)将联合向全国发起论文征集活动.入选论文将在《云南大学学报(自然科学版)》正式出版.纳米科技是一门广泛交叉的科学,更是一项新技术的应用,论坛希望通过学术研究与交流,扩大应用领域,开发研究范围;运用不同方法和不同应用领域的相关性,推动纳米科技从科学技术向实用工程过渡. 同时,"西部科技频道网"也将运用网络这一新兴的科技传播平台,积极作论文范文征集活动与学术活动的信息发布与跟踪报道.重点发挥网络传播的时效性,多样性,交互性和完整性等特点,对历次征集的学术论文,学术活动,科技成果及新产品信息进行网上巡展,把每次活动延伸至更广阔的空间.meeting.edu./aboutmanager/usermeet.jsp?id等于544

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