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纳米金属氧化物的制备及应用研究的若干进展   总被引:71,自引:0,他引:71       下载免费PDF全文
综述了氧化物及复合氧化物纳米晶的各种制备方法及特点 ,重点介绍了有机配合物前驱体法 聚乙二醇法、明胶法和硬脂酸法制备氧化物纳米晶的原理、特点以及在磁性材料、电磁波吸收材料、催化剂和塑料改性方面的若干应用  相似文献
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高分子网络法制备纳米NiO超细粉的研究   总被引:15,自引:0,他引:15       下载免费PDF全文
Superfine NiO powders,15~50nm ca., with single phase and uniform particle size have been prepared from Ni(NO3)2 by a polymer-network gel process. The results demonstrate that the distribution of the particle sizes of final oxides depends on the heated temperature,time and concentration of original nickel nitrate solution. The control of particle size of nano-NiO powders can be realized by the control of the condition of the process.  相似文献
3.
纳米氧化亚铜的制备及其电化学性质   总被引:5,自引:0,他引:5  
研究了纳米氧化亚铜的软模板制备法,并用XRD和TEM对所制备的纳米氧化亚铜进行了表征.试验表明,利用十六烷基三甲基溴化胺为软模板制备的纳米氧化亚铜呈直径为10 nm左右,长度为250 nm左右的纳米晶须.利用Nafion将新制备的纳米氧化亚铜固定在玻碳电极表面,研究了纳米氧化亚铜的电化学性质.结果表明,纳米氧化亚铜在电极表面表现出一对对称性良好的氧化还原峰,对应于纳米氧化亚铜中心的Cu(Ⅱ)/Cu(Ⅰ)的氧化还原,峰电流随扫描速度的增大呈现线性关系,根据峰电位与扫速对数的线性关系,计算出了电子转移系数.表明纳米氧化亚铜在电极表面的反应是受表面控制的部分不可逆过程.  相似文献
4.
Polycrystalline samples of (1−x) CeO2x/2 Bi2O3 phases, where x is the atom fraction of bismuth have been synthesized by the precipitation process and after the thermal treatment at 600 °C, under air. Samples are first characterized by the X-ray diffraction and scanning electron microscopy. To determine the samples specific surface areas, Brunauer-Emmett-Teller (BET) analyses have been performed. In the composition range 0≤x≤0.20, a cubic solid solution with fluorite structure is obtained. For compositions x comprised between 0.30 and 0.90, two types of T′ (or β′) and T (or β) tetragonal phases, similar to the well-known β′ or β Bi2O3 metastable structural varieties, are observed. However, the crystal cell volumes of these β′ or β Bi2O3 phases increase with the composition x in bismuth: this might be due to the presence of defects or substitution by cerium atoms, in the tetragonal lattices. Using X-ray diffraction profile analyses, correlations between bismuth composition x and crystal sizes or lattice distortions have been established. The solid-gas interactions between these polycrystalline materials and air-CH4 and air-CO flows have been studied as a function of temperature and composition x, using Fourier transform infrared (FTIR) analyses of the conversions of CH4 and CO gases into the CO2 gas. The transformations of CH4 and CO molecules as a function of time and temperature are determined through the intensities of FTIR CO2 absorption bands. Using the specific surface areas determined from BET analyses, these FTIR intensities have been normalized and compared. For all bismuth compositions, a low catalytic reactivity is observed with air-CH4 gas flows, while, for the highest bismuth compositions, a high catalytic reactivity is observed with air-CO gas flows.  相似文献
5.
武志富  石云峰  吴汉夔  侯越 《应用化学》2014,31(12):1359-1367
综述了纳米氧化铋的发展研究现状,总结了近年来发展起来的几种制备纳米氧化铋的新方法的优缺点,以及纳米氧化铋作为电子功能材料、燃速催化剂、光催化降解材料、光学材料、医用复合材料和防辐射材料等方面的主要应用。  相似文献
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