ABSTRACT
Fe3O4 magnetic nanoparticles were prepared with ultrasonic-assisted chemical coprecipitation method. FeSO4 ⋅7H2O and FeCl3 ⋅6H2O were mixed into a flask in a certain ratio, with continuous nitrogen accessed. During the reaction, ammonia was added into the reactor to maintain pH value of mixture is 11 under the action of the ultrasonic oscillation. The mixture was placed at room temperature for 30 min. After centrifugation, washing, ultrasonic cleaning machine to remove impurities on the surface and vacuum freeze-drying, Fe3O4 magnetic nanoparticles were prepared.
