Patent ID: 8268175

Claim:
A method for transferring inorganic oxide nanoparticles from aqueous phase to organic phase, comprising: (a) providing an aqueous dispersion of inorganic oxide nanoparticles; (b) modifying the inorganic oxide nanoparticles by a modifier, wherein the modifier is selected from hexamethylsiloxane, 3-glycidoxpropryl methydiethoxysilane, 3-(methoxysilyl) propyl methccrylate and n-octyltriethoxysilane; (c) thoroughly mixing a mixed solution of an extracting solvent and water with the aqueous dispersion of modified inorganic oxide nanoparticles of step (b) to transfer the modified inorganic oxide nanoparticles into the extracting solvent, wherein the extracting solvent and water in the mixed solution is in a weight ratio between about 1:1.2 and 1:0.3, wherein the extracting solvent is ethyl acetate or hexane; and (d) after the extracting solvent and all of the water obtained from the above steps are respectively separated to an organic phase and an aqueous phase, collecting the organic phase including the extracting solvent.