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- W2007993881 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 30~40 nm to 11 nm 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 74.684 emu/g to 55.392 emu/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." @default.
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- W2007993881 date "2015-03-01" @default.
- W2007993881 modified "2023-10-03" @default.
- W2007993881 title "Preparation and characterization of Fe3O4 magnetic nanoparticles modified by perfluoropolyether carboxylic acid surfactant" @default.
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- W2007993881 doi "https://doi.org/10.1016/j.matlet.2014.12.037" @default.
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