介孔TiO_2的结构分析

研究了热处理过程中介孔TiO2 的结构及晶粒尺寸、比表面积间的相互关系,为纳米结构材料的定量研究奠定了基础。借助GWShere的圆柱通孔模型,将有孔氧化物视为立方结构体,通过比表面积、孔径、密度等参数的计算,对介孔TiO2 的微结构进行了分析,结果说明其高比表面积主要来自于纳米晶和孔结构两者共同作用。并在晶粒尺寸、比表面积、孔容之间建立了定量关系模型,不仅解释了其比表面积的变化规律,也使得预测孔结构数据成为了可能。

Structure analysis of mesoporous titania on the nanometer scale

The structure and relationship between crystallite size and specific surface area of mesoporous titania obtained under different temperatures were studied, which serve as foundation for the quantitative study on the nanometer scaled material. With application of the cylinder skeleton model, where oxides were regarded as materials with cubic framework,the structure of mesoporous titania was analysed by the means of quantitative calculation based on several parameters,such as specific surface areas,pore diameters as well as density,etc. It is concluded that the high specific surface area of mesoporous titania is the mutual effect of nanocrystalline and real pore framework. And the quantitative model on the crystallite size, specific surface area and pore volume was founded to interpret the change of specific surface area as well as makes it possible to predict the data about the pore structure.