Volume 5, No. 1, June 2005, Pages 1-13 PDF(416 KB)
Characteristics of Titania Nanoparticles Synthesized Through Low Temperature Aerosol Process
John K. Ani, S. Savithri, G.D. SurenderSurajit
Regional Research Laboratory (CSIR) Trivandrum- 695 019 India
As one of the important process alternatives for the synthesis of nano materials with lower costs, flexibility and versatility, vapor phase synthesis of titania nano particles continue to attract attention. A low temperature aerosol process for the synthesis of titania nano particles is demonstrated by elucidating the influence of temperature, molar ratio of H2O/TiCl4 and concentration of precursors on particle size and phase composition. This paper highlights the advantages of employing amorphous phase titania powder as solid precursor for its transformation to the rutile phase at temperatures less than 973K through vapor phase hydrolysis of TiCl4. A mechanistic hypothesis is proposed to explain the catalytic role of water vapor in the enhancement of amorphous to anatase phase transformation at high (15 to 27) molar ratio of H2O/TiCl4.
Vapor phase; Hydrolysis; Calcination; TiCl4; Amorphous.