Thermo-magnetic stability of magnetic Fe₃O₄ nanoparticles for hyperthermia

Monodispersed Fe₃O₄ magnetic particles adsorbed by amylase (such as citric acid (CA), carboxymethyl chitosan (CMCH) and β-cyclodextrin (CD)) were prepared by means of co-precipitation method. The absorption character of the samples was investigated by FT-IR, TG and VSM. It was found that the carboxyl (COOH groups) of amylase reacted with the hydroxyl (OH groups) on the surface of Fe₃O₄ particles, resulting in the formation of iron carboxylate that was adsorbed onto Fe₃O₄. The induction heating properties of the magnetic Fe₃O₄ nanoparticles in an alternating current magnetic field were also investigated and the thermo-magnetic stability in induction heating was discussed.