Method for Synthesizing Nano-Sized Titanium Dioxide Particles
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United States of America Patent
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Issued Date -
Mar 13, 2008
app pub date -
Oct 13, 2005
filing date -
Oct 14, 2004
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Abstract
A method for synthesizing TiO.sub.2, metal-doped TiO.sub.2, and metal-coated TiO.sub.2 particles of spherical form factor and needle type of which the average particle size is below 150 nm. The method of the invention is to synthesize Ti(OH).sub.4, metal-doped Ti(OH)4 or metal-coated Ti(OH)4, and react the same by applying a pressure above the saturated vapor pressure at a temperature above 100.degree. C. The pressure is achieved by means of the pressure of the vapor generated during the reaction inside of a closed reactor, by pressure applied from the outside, or a mixture of both. Gases to increase the pressure from outside are preferably inert gases such as Ar and N.sub.2 but are not limited to inert gases.
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