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Synthesis and application of bilayer-surfactant-enveloped Fe3O4 nanoparticles: water-based bilayer-surfactant-enveloped ferrofluids

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Abstract

Superparamagnetic carbon-coated Fe3O4 nanoparticles with high magnetization (85 emu·g-1) and high crystallinity were synthesized using polyethylene glycol-4000 (PEG (4000)) as a carbon source. Fe3O4 water-based bilayer-surfactant-enveloped ferrofluids were subsequently prepared using sodium oleate and PEG (4000) as dispersants. Analyses using X-ray photoelectron spectroscopy, X-ray diffraction, and Fourier-transform infrared spectroscopy indicate that the Fe3O4 nanoparticles with a bilayer surfactant coating retain the inverse spinel-type structure and are successfully coated with sodium oleate and PEG (4000). Transmission electron microscopy, vibrating sample magnetometry, and particle-size analysis results indicate that the coated Fe3O4 nanoparticles also retain the good saturation magnetization of Fe3O4 (79.6 emu·g-1) and that the particle size of the bilayer-surfactant-enveloped Fe3O4 nanoparticles is 42.97 nm, which is substantially smaller than that of the unmodified Fe3O4 nanoparticles (486.2 nm). UV–vis and zeta-potential analyses reveal that the ferrofluids does not agglomerate for 120 h at a concentration of 4 g·L-1, which indicates that the ferrofluids are highly stable.

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Correspondence to Jian-hui Qiu or Hui-xia Feng.

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Chen, By., Qiu, Jh. & Feng, Hx. Synthesis and application of bilayer-surfactant-enveloped Fe3O4 nanoparticles: water-based bilayer-surfactant-enveloped ferrofluids. Int J Miner Metall Mater 23, 234–240 (2016). https://doi.org/10.1007/s12613-016-1231-2

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  • DOI: https://doi.org/10.1007/s12613-016-1231-2

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