Abstract
Magnetic iron oxide nanoparticles were successfully prepared by sonochemical oxidation of aqueous solution containing FeSO_4 and NaOH. Obtained particles were identified as magnetite by XRD measurement. The morphologies of the products were characterized by TEM observation. In the use of polyethylene glycol monostearate as protective agent, the dispersity of the formed nanoparticles was improved. Additionally, these nanoparticles showed narrower size distribution than that in the absence of protective agent. When sodium dodecyl sulfate was employed, sonochemical oxidation of Fe(II) slowed down probably due to its higher scavenging effects for hydroxyl radicals. We also investigated the preparation of Au/magnetite nanocomposite.
