ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract Nanosized TiO2 powder with anatase structure was synthesized by a sol-gel method using TiCl4 ethanol solution as a precursor. The grain size of TiO2 powder was homogenous and was about 10 nm after the precursor was calcined at 500 °C for 1 hour. Anatase TiO2 powder formed after the precursor was calcined at a temperature ranging from 300 °C to 550 °C. The gelatinizing mechanism of TiCl4 in ethanol solution can be described as followings. When mixed with ethanol, TiCl4 reacted with ethanol to form TiCl x (OCH2CH3)4 − x species and HCl gas. During gelatinizing process, TiCl x (OCH2CH3)4 − x species absorbed water from atmosphere to form Ti(OH)4 precursor, which was polymerized to be an inorganic polymer. The formation of inorganic polymer of Ti(OH)4 was intensified with gelatinizing time. In contrast, the organic component was removed from the precursor. The formation of anatase TiO2 can also be promoted by increasing gelatinizing time. The influence of alcohol on the reacting progress and dispersivity was also studied. The size and activity of alcohol molecule were found to have influence on the polymerization and mineralization degree of the precursor and the dispersivity of TiO2 powders.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1004882120249
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