机构地区: 广东工业大学材料与能源学院
出 处: 《硅酸盐通报》 2007年第1期75-79,共5页
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.
领 域: [化学工程]