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

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• 作者：Bai-yi Chen ; Jian-hui Qiu ; Hui-xia Feng
• 关键词：magnetic fluids ; iron oxides ; nanoparticles ; bilayers ; sodium oleate ; polyethylene glycol
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：23
• 期：2
• 页码：234-240
• 全文大小：3,176 KB
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• 作者单位：Bai-yi Chen (1)
  Jian-hui Qiu (1)
  Hui-xia Feng (2)
  
  1. Department of Machine Intelligence and Systems Engineering, Faculty of Systems Engineering, Akita Prefectural University, Akita, 015-0055, Japan
  2. College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou, 730050, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science
  Metallic Materials
  Mineral Resources
  
• 出版者：Journal Publishing Center of University of Science and Technology Beijing, in co-publication with Sp
• ISSN：1869-103X

文摘

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. Keywords magnetic fluids iron oxides nanoparticles bilayers sodium oleate polyethylene glycol