中国粉体技术2017，Vol.23Issue(4)：54-57,4.DOI:10.13732/j.issn.1008-5548.2017.04.011
超临界水热合成法制备TiO2纳米粉体
Preparation of titania nano-powder by supercritical hydrothermal synthesis
摘要
Abstract
TiO2 nano-powders were synthesized by supercritical hydrothermal synthesis (SCHS) technology.The effects of reaction conditions including temperature,pressure,reaction time on the particle size,morphology and crystallinity were studied.The present results indicated that the particle size of synthesized TiO2 decreases dramatically but the crystallinity of particles increases with the temperature increasing from subcritical state to supercritical state.Finally ellipsoidal nanoparticles of 10 nm are obtained.In pressure range of 26～30 MPa,higher pressure is found to be in favor of improving the crystallinity degree of TiO2 nano-particles,but the particle size changes very little.The titania phase is detected in 1 min reaction time,well-crystallized ellipsoid crystals are obtained when reaction time is 5 min.With the increase of reaction time,the number of rod-shaped particles increases gradually.The particle growth seems to be driven by dissolving-crystallization mechanism.关键词
超临界水热合成/纳米颗粒/形貌/粒径/结晶度Key words
SCHS/nano-particles/morphology/particle size/crystallinity分类
化学化工引用本文复制引用
张拓,王树众,孙盼盼,王来升,杨健乔..超临界水热合成法制备TiO2纳米粉体[J].中国粉体技术,2017,23(4):54-57,4.基金项目
陕西省自然科学基金青年基金,编号:2014JQ2081 （）
