Abstract
Conventional surfactants-modified Fe3O4 magnetic nanoparticles (MNPs) are not satisfying in special areas, especially in corrosive and extreme temperature conditions. In this study, bare Fe3O4 MNPs were synthesized by co-precipitation without protective gas in atmosphere, and then modified by perfluoropolyether carboxylic acid surfactant (PCAS). Both the bare and the modified Fe3O4 MNPs were characterized. According to the results of characterization, the modified Fe3O4 MNPs are globular shaped and monodisperse whose average particle size decreased from 30~40nm to 11nm and in narrow distribution. In addition, characteristic peaks of PCAS and bare Fe3O4 both appear in FT-IR spectrum of modified Fe3O4 which suggest that Fe3O4 MNPs have been coated by PCAS. The surface coating won׳t alter Fe3O4 crystal morphology or superparamagnetism. However, it can slightly reduce saturation magnetization from 74.684emu/g to 55.392emu/g. The modified layer will be completely destroyed at near 380°C. The mass ratio of the modified layer to bare Fe3O4 core is close to 39:53 according to thermal analysis. In summary, these results collectively showed that PCAS was successfully decorated at the surface of Fe3O4 MNPs and the performance of modified Fe3O4 MNPs has been greatly improved.
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