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91198 
Technical Report 
Rutile titania nano sols and process for manufacturing the same 
Seok, SI; Ahn, BY; Kim, H 
2009 
U.S. Patent and Trademark Office 
Washington, DC 
U.S. Patent No. 7,611,688 
The present invention is related to a process of manufacturing rutile high-purity titania nano sols in a pure aqueous medium having no ionic impurities. In more detail, the present invention is related to a process for manufacturing titania nano sols, in which high-purity rutile titania nano particles are dispersed stably, through the hydrolysis of titanium tetraisopropoxide in an aqueous solution containing hydrogen peroxide (H.sub.2O.sub.2), and simultaneously with the hydrolysis, formation of peroxotitanate precursors, and hydrothermal treatment of them at 50-120.degree. C.