Synthesis, crystal structure and magnetic properties of iron oxides nanoparticles for biomedical applications
by S. Rashdan, M. Bououdina, A. Al-Saie, E. Ghanem, A. Bin-Thani, S. Althawadi
International Journal of Nanoparticles (IJNP), Vol. 3, No. 3, 2010

Abstract: Magnetic Fe₃O₄ nanoparticles have been synthesised by two methods: co-precipitation using a range of Fe³⁺ and Fe²⁷⁺ raw materials; oxidative hydrolysis using various Fe²⁺ salts. X-ray diffraction analysis shows that most of the samples prepared by the co-precipitation method resulted in a mixture of two iron oxide phases (Fe₂O₃ and Fe₃O₄) with the presence of impurities (unreacted precursors) while using the oxidative hydrolysis method, Fe₃O₄ was found to be a major product. Magnetic measurements confirm the results obtained by X-ray diffraction. The sample prepared using FeSO₄ as precursor in urea and PEG 200 at 40-50°C for 3 hours (nominated as E2) gives an average crystallites size around 70 nm, a saturation magnetisation Ms = 75 emu/g, a remanence of Mr = 12 emu/g and a coercivity of Hc = 110 kOe, which can be a good candidate for biomedical applications.

Online publication date: Thu, 07-Oct-2010

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