Synthesis and characterization of zinc and calcium nanoferrites

In this work, Zn(1-x)CaxFe2O4 nanoparticles (x = 0, 0.5 and 1) have been synthesized by sol-gel method followed by heat treatment at a temperature within the range of 300-700 A degrees C. The samples with appropriate saturation magnetization (Ms), low coercivity and remanence were Zn0Ca1Fe2O4 treated at 300 A degrees C (Ms similar to 25 emu/g), Zn0Ca1Fe2O4 treated at 400 A degrees C (Ms similar to 40 emu/g) and Zn0.50Ca0.50Fe2O4 treated at 400 A degrees C (Ms similar to 31 emu/g). These samples were analyzed by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffraction and transmission electron microscopy. The heating ability of selected nanoparticles was evaluated under a magnetic field using a solid state induction heating equipment. The obtained nanoferrites showed a particle size within the range of 13-14 nm. The Zn0Ca1Fe2O4 treated at 400 A degrees C was able to heat the nanoferrite particles/water suspension (10 mg/2 ml) at a temperature of 44 A degrees C under the selected magnetic field (10.2 kA/m and frequency 362 kHz). Additionally, in vitro bioactivity assessment was performed by immersing samples in a simulated body fluid for different periods of time at physiological conditions of pH and temperature. The samples showed an appropriate bioactivity. These nanoferrites are highly potential materials for hyperthermia treatment.