Synthesis and Properties of Superparamagnetic Fe₃O₄ Nanoparticles by Co-Precipitation Process

Abstract:

Superparamagnetic Fe₃O₄ nanoparticle with single phase has been synthesized successfully by a co-precipitation process. On the other hand, the effect of additive anhydrous ethanol in synthesis procedure was investigated for the magnetic properties of nanoparticles in this paper. The structure properties of synthetic Fe₃O₄ particle were measured through XRD, FT-IR and TG-DSC devices. The characteristic peaks of Fe₃O₄ have been observed to testify Fe₃O₄ with single phase. The particle size and shape were observed by SEM and TEM measurements. The addition of anhydrous ethanol could enhance the dispersion of Fe₃O₄ nanoparticles and restrain the agglomeration of nanoparticles. Therefore, the average particle size was about 18.2 nm, smaller than that of Fe₃O₄ particles prepared without anhydrous ethanol of 24.3 nm. Correspondingly, the saturation magnetization (Ms) of Fe₃O₄ prepared with and without anhydrous ethanol was determined to be 53.28 emu/g and 65.28 emu/g, respectively, lower than bulk magnetite particles of 90 emu/g. That is because, synthetic Fe₃O₄ with smaller particle size obtains the higher surface curvature, which could enhance the disordered crystal orientation on the particle surface, so the saturation magnetization was decreased.

• Periodical: Applied Mechanics and Materials (Volume 377)
• Pages: 173-179
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.377.173
• Online since: August 2013
• Authors: Chan Yin, Xiao Yi Wei, Ji Hua Li, Fei Wang
• Keywords: Anhydrous Ethanol, Co-Precipitation Process, Fe₃O₄ Nanoparticles, Superparamagnetism

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