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The study of novel Fe3O4@gamma-Fe2O3 core/shell nanomaterials with improved properties

By Gao Q, Chen FH, Zhang JL, Hong GY, Ni JZ, Wei X and Wang DJ


The surface structure of the iron oxide nanoparticles obtained by the co-precipitation method has been investigated, and a thin layer of alpha-FeOOH absorbed on surface of the nanoparticle is confirmed by analyses of Fourier transform infrared (FTIR), X-ray photoelectron spectra (XPS) and surface photovoltage spectroscopy (SPS). After annealed at 400 degrees C, the alpha-FeOOH can be converted to gamma-Fe2O3. The simple-annealed procedure resulted in the formation of Fe3O4@gamma-Fe2O3 core/shell structure with improved stability and a higher magnetic saturation value, and also the simple method can be used to obtain core/shell structure in other similar system

Topics: MAGNETIC PARTICLES, COBALT NANOPARTICLES, FEPT NANOPARTICLES, FE3O4, TISSUE, magnetic particles, tissue, magnetic powders, magnetic properties of fine particles, particles, magnetic, particulate magnetic media, powders, magnetic
Year: 2009
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