Comparative study of magnetite and cobalt ferrite submicron particles

Colloidal magnetic particles based on magnetite and cobalt ferrite were prepared and characterized aiming to reveal their suitability for several applications, especially in the biomedical field and biotechnology. Sodium oleate (C17H33COONa) shell was intended to stabilize the magnetic particles into the aqueous suspensions in order to get stable ferrofluids by preventing the agglomeration in gravitational but especially in magnetic field gradients. The application of usual physical methods (Xray powder diffraction, vibrating sample magnetometry and scanning electron microscopy (SEM)) allowed the assessing of some material features. The Bragg reflection curves showed the pattern charac…