Crystallographic, Morphological, Magnetic, and Thermal Characterization of Superparamagnetic Magnetite Nanoparticles (Fe3O4) Synthesized by Chemical Coprecipitation Method and Calcined at 250°C for 4 hr

Abstract

Magnetite nanoparticles (Fe₃O₄) were prepared by chemical coprecipitation method using ferric chloride (FeCl₃) and heptahydrate ferrous sulfate (FeSO₄·7H₂O) salts employing sodium hydroxide (NaOH) as a precipitant. To determine the size, shape, and chemical makeup of the produced magnetite nanoparticles, the generated powders were examined by transmission electron microscope, scanning electron microscope, atomic force microscope, and X-ray diffractometer. It was found that the magnetite powder had made a face-centered cubic crystal structure and spherical-like particle form with particle diameters of about 30 nm. The magnetic properties of magnetite nanoparticles were evaluated using a vibrating sample magnetometer. The obtained superparamagnetic properties of the produced nanoparticles, with saturation magnetization and coercivity of 50.75 emu/g and 30.09 Oe, respectively, allow them for applications in drug delivery, MRI contrast agent, catalysis, degradation of antibiotics, antibacterial activity, removal of heavy metals and organic dyes, etc.