SHAPE ANISOTROPIC METAL OXIDE NANOPOWDER AND PREPARATION METHOD THEREOF

摘要

PURPOSE: Maghemite (γ-Fe2O3) nanopowder used as ultra high density magnetic recording materials by having superior shape anisotropy and magnetic characteristics, hematite (α-Fe2O3) nanopowder used as precursor or catalyst of the maghemite and nanopowder in which the maghemite and hematite are mixed, and a preparation method of shape anisotropic metal oxide nanopowder are provided. CONSTITUTION: In a method for preparing nano sized metal oxide powder having superior magnetic characteristics, the method comprises the steps of precipitating and separating gel shaped amorphous metal oxide powder by adding protonic scavenger to the reverse micelle solution after forming a reverse micelle solution by adding distilled water, surfactant and solvent to metal salts of trivalence or more; controlling a mole ratio of metal oxide to surfactant by cleaning the gel shaped amorphous metal oxide powder using polar solvent; and crystallizing nano sized metal oxide particles through heating or reflux reaction by dispersing the gel shaped amorphous metal oxide powder into a non-polar solvent having high boiling point.