聚过氟磺酸离子交换膜电性能研究

研究了聚过氟磺酸离子交换膜在不同环境条件下的导电性能，从实用的角度出发，考察了膜在不同种类，不同浓度的电解质溶液中的导电能力，分析了各种离子对其导电性能的影响。根据实验数据，对膜的导电机理进行了推测，测定了膜对几种常用离子的选择性系数，研究了温度对膜导电能力的影响。     

几种磷化膜的抗碱性能

对几种磷化膜进行了试验研究，指出了影响磷化膜性能的各种因素，尤其详述了影响磷化膜稳定性、抗碱性以及膜厚等的因素，指明了提高磷化膜性能的途径。     

含淀粉聚乙烯膜的时控光降解研究

使用复合光降解剂，得到了可光降解的生物降解膜。对膜的光降解进行了考察，并对影响光降解的因素进行了讨论，结果表明，我们所制得的膜是一种较好的时控光降解膜。     

粒子增强PAN支撑膜的研究

对无机粒子填充的ＰＡＮ渗透发支撑膜进行了初步的研究，考察了不同填充量和填充体系及拉伸热定型的后处理工艺对膜通量和粘弹性的影响。结果表明，不同 和填充体系对膜通量及粘弹性的影响不明显；而拉伸和热定型的后处理工艺条件对膜通量和粘弹性有较大的影响。随拉伸比的提高，膜通量迅速增大，膜的稳定性变好，具有很好的耐热性，而膜的截流率却几乎不变。此外，还就膜的耐热机理进行了初步探讨 。     

特种包装薄膜对青椒保鲜效果的探讨

以普通PE包装薄膜为对照，探讨了淀粉膜、篮光膜、PVA膜三种特种薄膜对青椒保鲜效果，表明，淀粉膜、蓝光膜较PE膜更有利于青椒保鲜，而PVA膜较PE膜不利于青椒保鲜。     

低能离子束沉积类金刚石膜的结构及性能研究

研究了利用低能离子束技术，在单晶硅片等多种基体表面形成类金刚石薄膜（ＤＬＣ膜）。利用透射电镜、Ｘ射线光电子能谱及拉曼光谱等分析手段对该膜进行了显微结构分析，发现类金刚石膜是含有金刚石及其它碳相的混合碳膜。对该膜性能测试表明，该膜类似金刚石的性能，其光学、电学、机械及化学性质优异。探讨了类金刚石膜生长的机理，对类金刚石膜的一些可能的应用进行了研究。     

膜结晶技术研究进展及应用前景

对一种新的分离技术——膜结晶进行了综述．介绍了膜结晶技术的产生、原理和优点，以及膜结晶的过程及膜结晶器的类型．概述了膜结晶在国内外的发展和应用状况，重点介绍了膜结晶在盐溶液结晶和生物高分子溶液结晶两个方面的研究与应用，并对膜结晶技术的前景作了展望．     

透湿膜的透湿机理与膜的研究概况

基于透湿膜的空气除湿是一种比较新颖的空气除湿方法。本文介绍了各种膜在空气除湿领域的应用情况，结合对膜制备工艺的简要介绍，侧重对原除湿原理，亲水性的高分子纤维素膜，凝胶膜和分子筛无机膜在空气除湿领域的研究和进展进行了分析。     

再铸Nafion膜的制备与应用

采用溶液－浇铸法用商业化Nafion膜的溶解液制备再铸Nafion膜，对再铸Nafion膜进行了氧气渗透系数测试和电池性能评价，并与厚度相近的商业化Nafion膜进行比较，同时对再铸Nafion膜组装的PEMFC进行了短期稳定性考查，实验结果表明：通过溶液－浇铸法制备的再铸Nafion 膜可以应用于质子交换膜燃料电池，再铸Nafion膜的氧气渗透系数和电池性能与商业化Nafion膜相近，再铸Nafion膜组装PEMFC在150h之内未见电池性能下降。     

CaCl2对聚丙烯腈超滤膜性能的影响

在PAN／DMAC体系里，研究了添加剂CaCl2对聚丙烯腈超滤膜性能的影响，通过膜的纯水通量，切割分子量曲线以及场发射扫描电镜对所制得的膜进行了表征及研究．与无添加剂的PAN／DMAC体系相比，CaCl2的加入降低了膜液的黏度，提高了膜的纯水通量，而对膜的切割分子量无明显的影响．     

A generic approach for vertical integration of nanowires

We report on the collective integration technology of vertically aligned nanowires (NWs). Si?and ZnO NWs have been used in order to develop a generic technological process. Both mineral and organic planarizations of the as-grown nanowires have been achieved. Chemical vapour deposition (CVD) oxides, spin on glass (SOG), and polymer have been investigated as filling materials. Polishing and/or etching of the composite structures have been set up so as to obtain a suitable morphology for the top and bottom electrical contacts. Electrical and optical characterizations of the integrated NWs have been performed. Contacts ohmicity has been demonstrated and specific contact resistances have been reported. The photoconducting properties of polymer-integrated ZnO NWs have also been investigated in the UV-visible range through collective electrical contacts. A small increase of the resistivity in the ZnO NWs under sub-bandgap illumination has been observed and discussed. A comparison of the photoluminescence (PL) spectra at 300?K of the as-grown and SOG-integrated ZnO nanowires has shown no significant impact of the integration process on the crystal quality of the NWs.     

The role of interphase and contact surfaces in the formations of structures and properties of diamond-(WC-Co) composites. A review

The publications on theoretical and experimental studies of the formation of structures of interphase and contact surfaces and their effect on properties of the diamond-(WC-Co) composite materials have been analyzed. Compositions and structures of WC/WC, WC/Co, diamond/WC-Co surfaces have been described, technologies that make possible the influence on the structure formation of these surfaces have been considered and ways of further investigations in this field of materials science have been proposed.     

Scanning electron microscopy studies of failure surfaces of short glass fibre — rubber composites

The failure surfaces of short-glass fibre reinforced rubber composites have been examined by scanning electron microscopy. The tensile, tear, flexing and abrasion modes have been studied. The different modes generate typical fracture surfaces depending on the nature of the test. The technical properties of the composites with and without reinforcing carbon-black filler have been explained on the basis of fracture modes. For comparison, mixes without fibre have also been studied.     

Preparation of AlFe nanoparticles by mechanical alloyed technique

Small metallic particles (1-3 nm) have been obtained using mechanical alloying techniques. Analytical techniques such as scanning electron microscopy have been used for the morphological and chemical characterization of the AlFe alloyed powders. B, Ni and Ti have been explored as reinforced elements to the initial AlFe mixture. X-ray diffraction patterns and transmission electron microscopy (TEM) techniques have been employed for the structural characterization of the small metallic particles. Theoretical simulations based on molecular dynamics have been used to interpret some of the experimental structural results. Furthermore, theoretical simulations of HREM images based on the dynamical theory of electron diffraction have also been obtained and comparisons with the experimental results have been carried out. The complementary analyses determined that the produced clusters are basically AlFe alloyed nanoparticles immersed in a matrix and with multiple defected structures.     

Progress in III-nitrides: Process issue and purity perspective

The growth of good quality layers of gallium nitride (GaN) as suitable for epitaxial growth is of great technological importance. Chloride vapour phase epitaxy (Cl-VPE) has been employed to grow good quality layers of GaN. The grown layers have been extensively characterized for their structural and optical properties. MOVPE grown GaN layers have been used to address process issues on device structuring and fabrication. GaN samples with different transition metal dopants have been synthesized and their usefulness as semi-magnetic materials, which are also identified as dilute magnetic semiconductors (DMS), have been evaluated. Better results have been obtained on the magnetic characteristics of GaN with ruthenium as the dopant. Nano dimensional structures of GaN have been obtained with excellent control of the growth parameters.     

Temperature-dependent barrier height in CdSe Schottky diode

This article reports the measurements of temperature-dependent barrier height (BH) of CdSe Schottky diodes. These diodes have been made by thermal evaporation technique on ITO glass and glass substrates at room temperature. The XRD measurements have been made and the average particle size has been calculated which comes out to be ~20 nm. The Au dots have been made for non-ohmic contacts. I–V characteristics have been measured at different temperatures (280–330 K). These characteristics obey the thermionic emission theory. The BH decreases and ideality factor increases with the increase in temperature. Richardson’s plot has been made and Richardson’s constant has been calculated which is less than the expected value. Capacitance measurements have been done at different frequencies and the interface states have been calculated. The results have been explained on the basis of BH inhomogeneities.     

Creep life extension of high temperature components under wall thinning conditions

Current methods of life extension of high temperature components have been examined. Importance of changing section size as a result of corrosion and erosion has been emphasized. A simple method based on the influence of service exposure on rupture strength of the material and the data collected on loss of section size during routine shut-down of plants has been suggested. Highlights of the computer software developed to assist such an exercise have been discussed. The outputs have been shown to compare fairly well with the results reported in literature.     

Bending stiffness of composite plates with delamination

Cross-ply GFRP circular plates have been impacted repeatedly at increasing input energies. The global bending stiffness of each plate was measured before and after each impact through quasi-static bending tests. The effects of local thickening as well as matrix cracking and delamination on global bending stiffness have been discussed. Approximate analytical solutions for bending of damaged and undamaged plates under uniform ring load have been obtained. Two types of models have been used to separate the effects of changes in material and geometrical properties on global bending stiffness. The trends of bending stiffness changes have been successfully simulated by analytical calculations.     

Modified zinc silicate — an active rubber filler

Physico-chemical properties have been characterized for zinc silicates obtained in various conditions in reaction of sodium metasilicate solution with water soluble zinc salt (zinc sulphate or chloride). Attempts have been made to apply the precipitated zinc silicates in rubber mixtures based on butadiene-styrene rubber. Appropriate tests have been conducted. Also, a possibility has been tested of eliminating zinc oxide (an activator in the vulcanization process) from the rubber mixture. Studies have been presented on the modification of zinc silicate surface with silane and titanate coupling agents. The extent of surface modification has been estimated measuring heats of surface immersion and determining chemisorbed carbon on the surface which has originated from coupling agents. The effect of modifying zinc silicate surface has been evaluated by strength tests performed on vulcanizates filled with the modified silicates.     

Stable aqueous dispersions of ZnO nanoparticles for ink-jet printed gas sensors

For the preparation of printed devices based on ZnO nanoparticles (ZnO NPs), stable colloidal dispersions of these materials are highly desirable. ZnO NPs have been synthesized by Chemical Vapor Synthesis. The particles have a spherical shape with a narrow size distribution. Stable aqueous dispersions of the ZnO NPs have been successfully prepared after the addition of a polymeric stabilizer. These stable dispersions have been used to print ZnO NP films on interdigital gold structures on silicon by ink-jet printing. The printing parameters have been optimized for forming layers with high quality. Close-packed ZnO NP thin films with a thickness between 100-250 nm have been prepared. Impedance spectroscopy has been used to study the gas sensing properties of the printed films at different temperatures in air and in hydrogen. The impedance spectra show the semi-circles typical for semiconducting materials. The conductance of the printed films has been measured at room temperature with high accuracy. In hydrogen gas, the conductance is larger as expected and this behavior is reversible.