【摘要】 应用同步辐射X光小角散射法对采用溶胶 凝胶方法制备、并经过不同温度热处理的纳米氧化铁干凝胶的孔隙结构进行研究。从孔隙的大小分布、比表面和分形行为等三个方面进行分析。结果表明 :氧化铁干凝胶中的孔隙呈多分散性 ,平均孔径大小随热处理温度的升高而增大 ;体系具有质量分形特征 ,随热处理温度的升高 ,分形维数增大 ,所拥有的分形尺度范围变窄。更多还原

【Abstract】 Small angle X-ray scattering（SAXS） with synchrotron radiation as X-ray source is used to study the pore structure of Fe₂O₃ xerogels prepared by sol-gel procedure and then heat-treated at different temperatures.By analysing the distribution of diameters of the pores, specific surfaces and fractal behaviors in samples, the characters and mechanisms of pores growing are discussed. The results show that the pores in Fe₂O₃ xerogels are polydisperse and the structure of the pores is mass fractal. With increase in heat-treatment temperature,the average size of diameters of the pores and the dimension of fractal of Fe₂O₃ xerogels are increased, whereas the scale range possessing fractal behavior become narrow.更多还原