Department of Chemical System Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Langmuir. 2010 Apr 6;26(7):4567-71. doi: 10.1021/la904619x.
The influence of the initial particle size and packing of anatase crystallites on the phase stability of nanostructured titania was investigated. Dried anatase gels with different degrees of particle packing were prepared through the peptization-induced electrostatic stabilization of primary particles in the sol. The initial size of anatase primary particles was varied by precalcination prior to the anatase-rutile phase transformation that occurred during final calcination. In the case of well-packed titania, the initial size of anatase primary particles does not influence the phase-transformation behavior whereas loosely packed titania shows a strong initial anatase primary particle size dependence on the phase-transformation behavior.
研究了锐钛矿晶的初始粒径和堆积对纳米结构二氧化钛的相稳定性的影响。通过溶胶中初级颗粒的静电稳定化作用，制备了具有不同程度颗粒堆积的干燥锐钛矿凝胶。在最终煅烧过程中发生锐钛矿-金红石相变之前，通过预煅烧来改变锐钛矿初级颗粒的初始尺寸。在钛白粉堆积良好的情况下，锐钛矿初级颗粒的初始尺寸不会影响相变行为，而堆积松散的钛白粉则表现出对相变行为强烈的初始锐钛矿初级颗粒尺寸依赖性。
