Patent ID: 9138704
Filing Date: 2015-09-22
Classification: B01F,B82Y,C01P,C09C,Y10S

Abstract:
1. A method for preparing a suspension of metal oxide nanoparticles with an average size of less than 100 nm, the method comprising: mixing a dispersing medium with a dispersant and a metal oxide powder with a particle size of about 0.1 to 100 microns to form a primary mixture, wherein the primary mixture includes about 10-40 wt % of the metal oxide powder, wherein the dispersant is sodium citrate or citric acid, and wherein the dispersing medium is water; dispersing the primary mixture to form a slurry of the primary mixture; grinding the slurry of the primary mixture at 234 revolutions per minute (rpm) or at about 420 rpm to obtain a suspension, wherein during the grinding, a further amount of the dispersant and the dispersing medium are added to the slurry of primary mixture at predetermined time intervals; adding a further amount of the dispersant and the dispersing medium to the suspension to obtain a diluted suspension; and dispersing the diluted suspension to obtain dispersed diluted suspension.