Synthesis and characterization of uniform and crystalline magnetite nanoparticles via oxidation-precipitation and modified co-precipitation methods

Magnetite (Fe3O4) nanoparticles have been prepared by oxidation-precipitation method using Monoethanolamine (MEA) as precipitation agent and by modified co-precipitation method using the mixture of isomeric-branched primary alcohol (A1416) and kerosene as stabilizing agent, respectively. X-Ray Diffraction (XRD) patterns and Transmission Electron Microscopy (TEM) images indicate the formation of magnetite with cubic phase consisting of crystalline, near-to-spherical particles with sizes around 10 nm. At high PH values or elevated temperature the precipitated particles possess larger crystallite sizes. Magnetic diameters are obtained by using Chantrell's equations from the magnetic hysteresis loops. The proportion of spin disorder layer in nanocrystalline diameter decreases with an increase in crystallite size.