Controlled preparation of nanosize cobalt ferrite magnetic particles

Abstract Cobalt and iron (II) dodecylsulphate [Co(DS) 2 and Fe(DS) 2 ] form micelles. They have been used to make nanosize magnetic particles. The size of the particles is controlled by the surfactant concentration. The average size of the particles, determined by Transmission Electron Microscopy and by Small Angle X-Ray Scattering, varies from 2 to 5 nm, with less than 30% in polydispersity. The magnetic properties have been studied for various sizes of magnetic particles.