| 摘要 |
<p>LOWER-ENERGY PROCESS FOR PREPARING PASSIVATED INORGANIC NANOPARTICLES 5OF THE DISCLOSURE The disclosure is directed to a method for reducing the chemical activity and photo activity of titanium dioxide nanoparticles comprising adding an amorphous alumina-stabilizing agent, specifically an anion, such as citric acid, to an aqueous slurry of the titanium dioxide 10 nanoparticles; treating the aqueous slurry with a source of alumina, such as a solution of sodium aluminate, to form alumina- treated titanium dioxide nanoparticles; recovering the alumina-treated inorganic nanoparticles, wherein the nanoparticles have a particle size of about 50 to about 300 nm; and milling the nanoparticles to form nanoparticles having a particle size 15 about 15 % smaller than silica-treated inorganic nanoparticles milled under similar conditions. The titanium dioxide nanoparticles described herein are useful in cosmetic, coating and thermoplastic compositions. 17/05/06,15709 speci gp,2</p> |
