Abstract
Poly(ethyleneglycol)-coated Ni-Zn ferrite (Ni0.65Zn0.35Fe2O4) nanoparticles were synthesized in powder form by using the high-temperature polyol method. As shown by X-ray diffraction, the particles exhibited the inverse spinel crystal structure. Transmission electron microscopy analysis revealed that the particles had spherical shapes, with an average diameter of 8.5 nm. The optimum concentration of the nanoparticles in aqueous solution was found to be 0.40 mg/mL. The saturation temperature of this dispersion at a field strength of 4.4 kA/m and a frequency of 260 kHz was 42 °C, which is the desired temperature for application of the nanoparticles to magnetic hyperthermia. The specific absorption rate (SAR) of the particles, measured in aqueous solution with a particle concentration of 0.40 mg/mL, was 33.47 W/g, indicating their suitable use in magnetic hyperthermia applications. A dependence of the SAR on the square of the magnetic field intensity was also observed.
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