氧化锌电阻片侧面绝缘涂层的研究进展

综述了国内外近10年来氧化锌电阻片(以下简称电阻片)侧面抗大电流冲击绝缘涂层的研究进展情况,讨论了电阻片侧面无机绝缘涂层和有机绝缘涂层的选择问题,并指出纳米有机绝缘涂料是电阻片侧面绝缘涂层未来发展的方向。     

高通流能力电阻片的研究进展

综述了近年来国内外在提高氧化锌电阻片通流能力方面的研究进展。认为影响氧化锌电阻片通流能力的关键因素是电阻片微观结构不均匀性导致电流分布的不均匀性。通过采用湿式化学粉料制备法来提高粉料的均匀性是提高电阻片通流能力的有效途径。而改善粉料的均匀性,从根本上讲是改善添加剂在粉料中的分散均匀性。因此,添加剂在粉料中应尽可能地细化和均匀。     

升温速度对压敏瓷显微组织和电性能的影响

采用不同的升温速度制备ZnO-Bi2O3压敏瓷,通过扫描电镜和X-射线衍射对其显微组织和相成分进行了分析,探讨了升温速度对氧化锌压敏瓷电性能和显微组织影响机理.结果表明,当升温速度为5℃/min时,压敏瓷具有较为理想的综合电性能,其电位梯度为332 V/mm,非线性系数为30,漏电流为0.1 μA.     

Preparation and CO conversion activity of ceria nanotubes by carbon nanotubes templating method

Ceria nanotubes with high CO conversion activity by means of carbon nanotubes as removable templates in the simple liquid phase process were fabricated under moderate conditions. The pristine CNTs were first pretreated by refluxing in a 30% nitric acid solution at 140 ℃ for 24 h, then dispersed in an ethanolic Ce（NO3）3.6H2O solution with ultrasonic radiation at room temperature for 1 h. Under vigorous stirring, NaOH solution was added drop by drop into the above ethanolic solution until the pH value was 10. The product was collected and repeatedly washed with ethanol and on drying at 60 ℃, the CeO2/CNT composites were obtained. Then, the as-prepared composites were heated at 450 ℃ in an air atmosphere for 30 min to remove CNTs. The ceria nanotubes were characterized by X-Ray Diffraction （XRD）, Transmission Electron Microscopy （TEM）, and X-Ray Photoelectron Spectrum （XPS）. The results showed that the ceria nanotubes were polycrystalline face-centered cubic phase and were composed of lots of dense cefia nanoparficles. The diameter of cefia nanotubes was about 40-50 nm. Catalytic activity of the product for CO oxidation was carded out at the region of 30-300 ℃ in a U-shaped quartz reactor with feeding about 0.15 g of the catalyst, which was loaded on Al2O3 carder. The inlet gas composition was 1.0% CO and 28% O2 with N2 as balance, and the rate of flow was kept at 40 ml/min. The catalytic products were analyzed by gas chromatography. The as-repared CeO2 nanotubes showed higher CO oxidation activity, which indicated that the morphology of ceria products affected the catalytic performance. The ceria nanotubes supported on Al2O3 demonstrated that conversion temperature for CO oxidation to CO2 was lower than that for bulk catalysts.     

纳米SnO2/TiO2复合颗粒形态结构表征

采用均匀沉淀法在纳米TiO2表面淀积SnO2,利用DTA,XPS,XRD,TEM,HREM等手段分析复合颗粒的形态结构。结果表明该复合颗粒由锐钛矿相TiO2和四方晶系SnO2所组成,TiO2表面SnO2淀积层尺寸为0.5-10nm.     

纳米二氧化钛对RTV涂膜半导体导电行为的影响

本文研究目的是了解纳米二氧化钛对RTV涂膜半导体导电行为的影响规律。本文采用电位-电容法结合Mott-Schottky分析技术,研究了纳米二氧化钛对RTV涂膜在5%硫酸钠溶液中的导电行为影响。研究发现,添加纳米二氧化钛粉体,RTV涂膜Csc减小,其涂膜空间电荷层厚度增加。随着浸泡时间的延长,涂膜空间电荷电容Csc逐渐增加,表明涂膜中空间电荷层厚度随浸泡时间延长有逐渐减小趋势。添加纳米二氧化钛粉体,可促进RTV涂膜的导电行为由n型半导体导电特征转变为p型半导体导电特征,在添加量达2%时,转变为绝缘态。提出了RTV涂膜失效的半导体转变模型,纳米二氧化钛的作用正好与之相反。     

纳米α-MnO2形貌调控方法初探

以KMnO4、十二烷基醇聚氧乙烯(3)醚(AEO-3)、聚乙二醇400(PEG400)为原料,采用常温液相还原反应法成功制备出球形和棒状纳米α-MnO2.分析了PEG400添加量对产物形貌、大小的影响,采用X射线衍射(XRD)、透射电镜(TEM)等测试手段对产物进行了袁征,结果表明,PEG400在α-MnO2形貌调控方面起着重要的作用.     

磁控溅射TiO_2纳米管阵列与其组装的杂化太阳能电池

采用直流磁控溅射-热处理二步法在多孔阳极氧化铝模板上制备出TiO2纳米管阵列膜。将纳米管阵列膜转移到ITO导电玻璃,并分别与P3HT和P3HT∶PCBM组装成杂化太阳能电池。通过扫描电镜、X射线衍射仪、能谱仪和模拟太阳光光电性能测试系统化对TiO2纳米管阵列膜和其组装的太阳能电池进行了分析表征。在纳米管阵列膜和ITO玻璃之间加入TiO2结合层的P3HT∶PCBM基杂化太阳能电池表现出最好的转换效率。该方法制备的大面积TiO2纳米管阵列膜,纯度高、工艺稳定,在未来的聚合物太阳能电池商业化应用中具有巨大潜力。     

PET工程塑料用无卤阻燃剂研究进展

综述了PET工程塑料用无卤阻燃剂的研究进展,包括磷系、氮系、无机纳米粉体及其复配阻燃剂。讨论了上述几种阻燃剂的阻燃机理及应用情况,并预测了其今后的发展方向。