reaction between the FeCl $ _2 $/FeCl $ _3 $ solution and the ammonia water. The size of
the MNPs could be controlled from 10.0 to 14.6 nm by changing the concentration of the
solutes. The particles were superparamagnetic at room temperature. The saturation
magnetization of the MNPs increased with increasing concentration of reactants. The
magnetite nanoparticles were coated with a single layer of oleic acid (OA) to have a …