Preparation of TiO2 Ultrafine Powder in Terms of SCFD Technique
超临界流体干燥法制备纳米级TiO2的研究

Titanium dioxide ultrafine powders were prepard by sol-gel and supercritical fluid drying(SCFD) methods from cheap inorganic salts as raw materials. The ultrafine powders were characterized in terms of XRD, DTA-TG and TEM techniques. The dependence of particle size onsolution PH value, concentration, ageing time and SCFD condition was also investigated. It wasfound that the ultrafine powders so obtained eXhibit small crystallite sizes of 3-6urn, better thermal stability and less weight loss.