稀土纳米薄膜摩擦学性能研究

用自组装方法可以在单晶硅表面获得稀土纳米薄膜，得到的薄膜通过XPS，偏振光椭圆率测量仪、角接触仪、AFM等手段表征。通过滑动摩擦实验，可以测试稀土薄膜的界面粘附力。通过DF-PM型复复摩擦磨损试验机，考察稀土纳米薄膜的摩擦磨损特性。实验结果表明，稀土纳米薄膜具有低摩擦系数和高抗磨损特性。稀土纳米薄膜具有纳米级尺度、强界面结合力和低表面能，使其成为MEMS装置固体润滑的理想选择。     

碳纳米管的最新制备技术及生长机理

结合笔者的工作综述了碳纳米管的制备技术及生长机理的最新研究进展，重点介绍了近两年来碳纳米管制备的进展情况，包括传统制备方法的改进（电弧放电法、化学气相沉积法和激光蒸发法）、新型制备技术、特殊结构的碳纳米管制备；同时探讨了碳纳米管的各种生长机理；最后提出了碳纳米管制备技术和生长机理的发展方向。     

Preparation of Co3O4 Nanofibers via an Electrospinning Technique

Thin PVA/cobalt acetate composite fibers were prepared by using sol-gel processing and electrospinning technique.After calcination of the above precursor fibers,Co3O4 nanofibers with a diameter of 50-150 nm could be successfully obtained.The fibers were characterized by SEM,FT-IR,WAXD,respectively.     

纳米级Ag2S增感剂的制备及立方体和{100}面扁平氯化银影像体系的化学增感研究

由于氯化银{100}面扁平微晶乳剂的一系列优点及其巨大的发展潜力,使它备受当代影像科学研究人员的广泛关注.但研究者也一直被该乳剂在化学增感时总是伴随高灰雾的难题长期困扰.在明胶水溶液的保护下制备了粒径5nm的Ag2S纳米颗粒,并通过感光性能研究发现:该颗粒用作化学增感剂对氯化银立方体和{100}面扁平乳剂增感时,比传统使用的Na2S2O3增感剂优越,在低灰雾水平下获得了较高感光度,很好地解决了上述氯化银{100}面扁平微晶乳剂增感的难题.用漫反射光谱(DRS)作探针,跟踪记录纳米结构Ag2S增感剂加入后氯化银晶体表面上纳米Ag2S增感剂颗粒的演变情况,为新型纳米增感剂的优异增感特性提供了机理性解释.     

Preparation and Characterization of Nanotitanium Dioxide Coating Film Doped with Fe^3＋ Ions on Porous Ceramic

The nanotitanium dioxide （TiO2） photocatalytic and porous ceramic filtering technique is one of the advanced methods to effectively treat organic wastewater. The TiO2 sol doped with Fe^3＋ ions was prepared by sol-gel processing. The influences of the process conditions of coating nanophotocatalytic material- Fe^3＋-TiO2 film on the surface of porous ceramic filter by dipping-lift method on the performance of porous ceramic filter were studied. The porous ceramic filters have two functions at the same time, filtration and photocatalytic degradation. The results of this study showed that the pH and viscosity of the sol, amount of Fe^3＋ ions doped as well as the coating times greatly affect the quality of coating film, the performance parameters and the photocatalytic activity of the porous ceramic filter. When the pH of the sol is 3-4, the viscosity is about 6 mPa.S, the amount of doped Fe^3＋ ions is about 2.0 g/L, the porous ceramic filter has been shown to have the best filtering performance and photocatalytic activity. In this condition, the porosity of porous ceramic is about 42.5%, the pore diameter is 8-10μm. The degradation of methyl-orange is 74.76% under lighting for 120 rain.     

水/油型微乳液中球形及棒状钛酸锶钡纳米粒子的控制合成

Barium strontium titanate nanoparticles with spherical and rod-like morphologies were synthesized in water/Triton X-100/n-hexanol/cyclohexane quaternary reverse microemulsion solution. The influences of the molar ratio of water to surfactant (ω₀) and the concentration of reactants on the morphology and size of barium strontium titanate nanoparticles were studied. The structure, compositions and morphology of the prepared products were characterized by XRD, SAED, ICP, EDS and TEM. The results show that the obtained Ba_0.7Sr_0.3TiO₃ spherical nanoparticles with diameters of 20～100 nm and the Ba_0.7Sr_0.3TiO₃ nanorods with diameters of 70～120 nm and lengths up to 600～800 nm are a single crystal, with a cubic phase. The molar ratio for barium, strontium and titanate in products is about 0.7:0.3:1.     

扫描探针纳米加工技术的现状与发展趋势

介绍了扫描探针纳米加工技术的基本原理、应用前景和最新进展 ,并讨论了该技术的发展趋势     

纳米氧化铈的制备及其催化性能的研究

采用两种方法制备了纳米氧化铈材料, 通过X射线衍射分析(XRD), 透射电子显微镜(TEM), 表面吸附(BET)等手段对样品的物化性能进行了表征, 并对纳米氧化铈在三效催化剂中的应用进行了探讨, 通过催化反应试验对其催化性能进行了评价. 结果表明, 制备的样品具有纳米尺度的粒径, 热耐热稳定性好, 高温老化后晶相稳定, 在三效催化剂中应用时, 能有效改善三效催化剂的起燃特性, 催化性能较之普通氧化铈材料有明显提高.     

纳米级锰酸锂阴极材料的制备及其电化学性能研究

1．引言 锰酸锂阴极材料具有制备工艺简单、价格低廉、环保、安全性能较好等优点，已被国内大多数锂离子电池制造企业作为手机电池的阴极材料。但锰酸锂在高倍率电池中的研究和应用还较少，其原因之一是因为常用的高温固相法合成的锰酸锂产品粒径较大，在几个微米左右，锂离子在其颗粒内部嵌入脱嵌时迁移路径较长，导致其大倍率充，放电性能不佳。     

Zn(Oxin)2·2H2O纳米晶的固相化学反应合成及表征

随着纳米微粒研究的深入,对纳米超细微粒提出了不同的物理、化学特性需求,制备高纯、超细、均匀的纳米微粒,发展新型的纳米材料,就显得非常重要,而解决问题的关键在于研究、发展新的合成技术.通常,纳米微粒制备的要求是:表面洁净;粒子形状及粒径、粒度分布可控,防止粒子团聚;易于收集;有较好的稳定性;产率高.