结晶二氧化钛多孔球的常压液相制备

利用沸水处理有机钛前驱体球较为便捷地制备出结晶二氧化钛多孔球，采用XRD、SEM和TEM对二氧化钛球进行表征，并探讨了二氧化钛球锐钛矿纳米晶形成以及形貌变化的机理。结果表明：延长沸水处理时间有利于多孔结构的形成和纳米粒子的晶化，随处理时间的增加，前驱体球表面变得越来越粗糙，二氧化钛结晶度也逐渐增强。其形成机理主要归因于沸水处理过程中有机钛前驱体球原位发生的完全水解和聚合。

Preparation of Porous Crystalline Spherical Titania under Atmospheric Liquid Phase Conditions

Porous crystalline spherical titania was facilely prepared by treating the organic titanium precursor spheres with boiling water. The spherical titania was characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The probable mechanism for formation of anatase nanocrystal and the morphology change of precursor spheres was also discussed. The results demonstrate that extending the treating time in boiling water is helpful for the formation of porous structure as well as the crystallization of nanoparticles. With increasing in treating time, the surface of the procursor spheres become rougher and rougher, and the crystallinity of anatase titania improves gradually. The forming mechanism of porous structure and anatase nanocrystal is attributed to the complete in-situ hydrolysis and condensation of the organic titanium precursor spheres in boiling water.