CORE-SHELL CoFe2O4/Fe3O4 MAGNETIC NANOPARTICLES FOR EFFICIENT INDUCTIVE HEATING
Abstract
The conversion of electromagnetic energy into heat by nanoparticles (magnetic inductive heating) has potential for biomedicine applications such as drug release, hyperthermia, but low heating efficiency (SAR) has limited applications. Core-shell nanoparticles consisting of two soft-hard magnetic phases are of interest because the magnetic properties can be controlled to achieve optimal SAR. However, the relationship between structure, magnetic properties and the SAR is difficult to predict. The aim of this study is to discuss the magnetic properties and the SAR of core-shell CoFe2O4/Fe3O4 nanoparticles (CS CF/FO NPs). Saturation magnetization increases and coercivity of decreases as the volume or mass of the FO phase in CS CF/FO NPs increases as well as a better hard-soft magnetic exchange coupling. High SAR values are obtained when the particle sizes or magnetic parameters have optimal values as well as the exchange coupling beetwen the magnetic phases increases. In addition, the relaxation loss is the main mechanism contributing to the SAR in this experiment. The CS CF/FO NPs with superparamagnetic core particle size are potential candidates for magnetic hyperthermia.