Author/Authors :
Tajer-Kajinebaf، V. نويسنده Assistant Professor, Department of Materials Engineering, Takestan Branch, Islamic Azad University, P. O. Box: 34815-1515, Takestan, Iran. , , SARPOOLAKY، H. نويسنده , , Mohammadi، T. نويسنده Research Laboratory for Separation Processes, Faculty of Chemical Engineering, Iran University of Science and Technology, Tehran, Iran ,
Abstract :
Nanostructured titania was synthesized by colloidal and polymeric sol-gel routes. Stable colloidal and
polymeric titania sols were prepared by adjusting the proper values of the acid/alkoxide and the water/alkoxide molar
ratios. The properties of sols were determined by dynamic light scattering technique and synthesized titania was
characterized by thermogravimetry and differential thermal analysis, X-ray diffraction, Fourier transform infrared
spectroscopy, optical microscopy and field emission scanning electron microscopy. The results showed particle size
distribution of colloidal sol 10-50 nm compared to polymeric one which was 0.5-2 nm. Phase analysis of the colloidal
sample revealed anatase as the major phase up to 550 °C, while the polymeric route resulted only anatase phase up
to 750 °C. On the basis of results, titania prepared by the polymeric route showed better thermal stability against phase
transformation than the sample prepared by the colloidal route. Also, microstructural studies showed that titania
nanopowder can be produced by both sol-gel routes.
