Role of nanoparticle interaction in magnetic heating

Magnetic nanoparticles have many potential applications in therapeutics and drug delivery. Heating by magnetic nanoparticles for hyperthermia application has gained tremendous popularity as a non-invasive treatment for tumor ablation. The heating effect of magnetic nanoparticles at different concentrations (1-10 wt%) in the fluid is investigated by varying the alternating magnetic field (60-260 Oe). The observed temperature rise (Delta T) shows an unusual increase with applied field in a higher nanoparticle concentration. In contrast to the previous model, the present study shows that temperature rise is more rapid in the higher particle concentration (similar to 10 wt%) and low applied field (<125 Oe), and Delta T varies as H-3/2 instead of H-2.