Patent ID: 8871310

Claim:
A method for preparing surface-modified tantalum oxide nanoparticles, comprising: (i) adding an aqueous phase to an organic solvent which contains a surfactant, to prepare a water-in-oil microemulsion; (ii) introducing a tantalum precursor to said microemulsion; (iii) adding a surface-modifier having an organic silane group or phosphine group to a solution obtained at the step (ii); (iv) removing said organic solvent from a product obtained at the step (iii); and (v) separating surface-modified tantalum oxide nanoparticles from a mixture obtained at the step (iv), wherein said organic silane group is at least one selected from the group consisting of methacryloxypropyltrimethoxy silane (MPTMS) and 3-aminopropyltriethoxy silane (APS).