MAGNETISM NANO PARTICLE COATED SILICA AND METHOD FOR MANUFACTURING THEREOF

摘要

Magnetic nanoparticles coated with silica and a preparation method thereof are provided to coat every magnetic nanoparticle with silica easily because an anionic surfactant adsorbs onto the surface of the magnetic nanoparticle. Magnetic nanoparticles coated with silica include: magnetic nanoparticles; an anionic surfactant which adsorbs onto the surface of the magnetic nanoparticle; and a silica coating film which is applied onto the anionic surfactant. Further, the magnetic nanoparticles are one of Fe3O4, gamma-Fe2O3 and Fe3S4. A method for preparing the magnetic nanoparticles includes the steps of: (S10) adsorbing the anionic surfactant used as a dispersant onto the surfaces of the magnetic nanoparticles in an acidic solution; (S20) separating the magnetic nanoparticles of which the surfaces are adsorbed with the anionic surfactant, from the acidic solution, and washing the separated magnetic nanoparticles; and (S30) applying silica onto the anionic surfactant using a stobe method.