Abstract
In this study, silicone-oil-based γ-Fe2O3 magnetic fluid was successfully prepared by thermal oxidizing of Fe3O4 magnetic nanoparticles, which were prepared by chemical co-precipitation with FeSO4·7H2O and FeCl3·6H2O, and their surface was modified by oleate ligands. Silicone oil was used as carrier liquid and oleic acid was as surfactant for preparing γ-Fe2O3 magnetic fluid. It is found that the Fe3O4 nanoparticles surrounded by oleate ligands are not damaged during the thermal oxidizing. The shape of γ-Fe2O3 magnetic nanoparticles prepared is similar to spherical, and their mean size is about 10–20 nm, which has nothing obvious difference compared with Fe3O4. The saturation magnetization of γ-Fe2O3 magnetic fluid prepared is 14.25 A·m2·kg−1 and that of γ-Fe2O3 nanoparticles is 57.56 A·m2·kg−1. The needle of γ-Fe2O3 magnetic fluid is much bigger than that of Fe3O4 magnetic fluid under the same magnetic field, which shows better magnetic properties.
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