Synthesis of titania powders by hydrolysis of TiCl4 using ammonia gas

摘要：

Anatase and rutile TiO2 ultrafine powders were prepared by hydrolysis of TiCl4 using ammonia gas as precipitator at low temperatures. The type, the phase transformation, the average size and the particle shape of this powders obtained by this simple method were characterized by X-ray diffraction (XRD) , thermogravimetric and differential scanning calorimetric analyses (TG/DSC), transmission electron microscope（TEM）, dynamic light scattering (DLS). Experimental results showed that, rutile and anatase were prepared at different reaction temperature and pH values. When pH≤1, rutile phase TiO2 were obtained at low temperature(30～60℃). However, when pH≥4, the phase was anatase in the same temperature range. Moreover, longer aging times didnt change the phase of TiO2 sample. These anatase sample converted to complete rutile phase after calcinations at 700℃ for 2h. Polyethylene glycol 1000 (PEG -1000) was used as steric dispersant in this study. The presence of small amounts of PEG -1000 could make titania powders well dispersed in this simple method.

关键词： Anatase rutile Titania

作者: 孙爱华 郭鹏举 陈林 胡坤 李勇 崔平

作者单位: 中国科学院固体物理研究所材料物理重点实验室,安徽合肥,230031 中国科学院固体物理研究所材料物理重点实验室,安徽合肥,230031;中国科学院宁波材料技术与工程研究所,浙江,宁波,315040

会议类型: 国际会议

会议名称: 第六届中国国际纳米科技研讨会

会议地点: 成都

会议语种:英文

在线出版日期: 2007-11-19（万方平台首次上网日期，不代表论文的发表时间）