水热法一步合成核壳型TiO_2/Al_2O_3纳米粉体的热力学分析  

Thermodynamic Analysis of Core-Shell TiO_2/Al_2O_3 by One-Step Hydrother mal Method

作　　者：刘志平[1] 黄慧民[1] 邓淑华[1] 欧得华[1] 姬文晋[1] 

机构地区：[1]广东工业大学材料学院,广州510090

出　　处：《硅酸盐通报》2007年第1期75-79,共5页Bulletin of the Chinese Ceramic Society

基　　金：广东省工业攻关项目(030084);广东省工业攻关项目(2004A10701005)

摘　　要：水热法一步合成核壳结构的工艺路线具有简化生产工艺、大大缩短生产时间的特点。所以研究制备具有核壳结构的前驱体热力学条件有重要的指导意义。热力学分析表明,在纳米Ti(OH)4表面包覆Al(OH)3的过程中,存在核包覆和膜包覆的竞争;而在其它条件不变的情况下,包覆物的过饱和度对包覆形态起到了决定性的影响。在较低的过饱和度下,可形成膜包覆;如果过饱和度过高,则形成核包覆。The core-shell structure＇s synthesis process by one-step hydrothermal method has remarkable peculiarities, such as simple procedures and short production cycles. In order to get the precursor with the core-shell stucture, it＇s important to study the thermodynamical conditions. Through the thermodynamic analysis of coating process , it was proved that Al （ OH ）3 nucleus coating Ti （ OH ）4 competes with Al（OH） 3 film coating Ti （OH）4. If other conditions are unaltered, the super-saturation of Al compound was determinant of ultimate coating result. If the super-saturation is lower, Al （OH）s film can be obtained, otherwise, dissociative Al （OH） s particles can be acquired.

关 键 词：水热 核壳 表面包覆 热力学 

分 类 号：TQ133.1[化学工程—无机化工]