Effect of temperature on the synthesis and magnetic properties of cobalt ferrite nanoparticles for magnetic hyperthermia applications

چکیده مقاله

he variation of temperature is considered a very important parameter in the co-precipitation synthesis of magnetic nanoparticles (MNPs). However, the role of temperature in the synthesis of cobalt ferrite (CoFe2O4) MNPs and the investigation of its effect on magnetic hyperthermia have received less attention. Here, CoFe2O4 MNPs are synthesized at three temperatures (80, 100, and 120 °C) using a co-precipitation approach. Changing the synthesis temperature increases the size of the MNPs in a way that increases the coercivity and significantly reduces the contribution of superparamagnetic particles. First-order reversal curve (FORC) analysis shows that the synthesis at 120 °C leads to a mixture of single-domain and superparamagnetic MNPs, whereas the temperature of 80 °C reduces the formation of single-domain MNPs with less uniformity. To evaluate hyperthermia properties, MNP ferrofluids with different concentrations (1, 3, and 5 mg/ml) are prepared and examined under a frequency of 400 kHz and a magnetic field intensity of 400 Oe. The maximum specific loss power (SLP) for MNPs synthesized using the synthesis temperature of 80 °C is obtained to be 261.3 W/g.