Controlled crystallization of titanium dioxide particles in the presence of poly(vinyl alcohol) from peroxytitanic acid
writer：Zhifeng Wang，Shuhei Yamada，Ming Zhang，Hisao Kanzaki，Kohji Yoshinaga
keywords：Titanium dioxide, Nanoparticles, pH, Poly(vinyl alcohol), Crystal structure, Morphology
source：期刊
specific source：Colloid and Polymer Science
Issue time：2009年
Crystallization of TiO2 particles from peroxytatanic acid in the presence of poly(vinyl alcohol) (PVA) via a hydrothermal process was investigated. The crystal structure and morphology of TiO2 were significantly affected by pH and PVA dosage. High acidic condition without PVA led to the formation of rutile TiO2, while addition of PVA resulted in the formation of anatase TiO2. Much amount of PVA addition, and neutral or high pH circumstance were favorable for formation of anatase TiO2 particles. The pH of solution also affected morphology of TiO2particles produced. From TEM images, it was observed that in pH 5.5 solution rod-shaped clusters and in pH 8.5 solution nanoparticles aggregates composed of 20–30 nm TiO2 particles were formed.