纳米TiO_2的溶胶-凝胶法制备改进及粒径控制  

A Novel Technique to Prepare Nanocrystalline TiO_2 and Control Its Particle Size

作　　者：梁春香[1] 刘孝恒[1] 杨绪杰[1] 陆路德[1] 汪信[1] 

机构地区：[1]南京理工大学化工学院,江苏南京210094

出　　处：《日用化学工业》2001年第2期62-64,共3页China Surfactant Detergent & Cosmetics

摘　　要：以无机钛盐为前驱体 ,PEG和淀粉为分散剂 ,分别用溶胶 -凝胶法及改进溶胶 -凝胶法制备出纳米TiO2 粉体。在改进方法中 ,用溶解凝胶而不是传统的高温灼烧凝胶的方法得到TiO2 。所得的产物是极细 (4nm )并已明显开始结晶 (锐钛矿 )的TiO2 粉体。此粉末可用作加热法控制TiO2 颗粒尺寸的起始物质。TiO2 在极低温度 (≤ 10 0℃ )下结晶被推测为由聚合物与Ti (NO3 ) 4交联组成的凝胶结构比较特殊所致。在改进的方法中 ,少量的NO2 气体可被容易地吸收 ,同时 ,重复溶解的聚合物可重复利用。因此 。Nanocrystalline TiO_2was prepared by traditional and improved sol-gel methods with inorganotitanates and two polymers(PEG and starch),respectively.For the improved method,the way separating TiO_2 from dry gel depended on not calcining at all but redissolving the dry gel.The obtained TiO_2 powder is ultrafine(4?nm) and crystallized(anatase phase),which was acted as the raw material to control TiO_2 particle size by heated-treatment.It was supposed that the crystallization occurring at low temperature(≤100?℃)result from the special structure of gel which formed by the polymers with Ti(NO_3)_4.For the improved method,it was found that a small amount of NO_2 gas can be easily collected and redissolved polymers can be reused.So this method is also good to environment protection.

关 键 词：纳米级 二氧化钛 溶胶-凝胶 重复溶解 交联 重复利用 粒径控制 

分 类 号：TB383[一般工业技术—材料科学与工程]