Preparation of titania nano-powder by supercritical hydrothermal synthesis
ZHANG Tuo
WANG Shuzhong
SUN Panpan
WANG Laisheng
YANG Jianqiao
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.
Keywords：SCHSnano-particlesmorphologyparticle sizecrystallinity
Publication Date：2017-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：4( 54-57 )