期刊
APPLIED SURFACE SCIENCE
卷 255, 期 6, 页码 3485-3492出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2008.09.071
关键词
Magnetic nanoparticles; Fe3O4/SiO2; Surface modification; Ferrofluids; Rheology
类别
资金
- National Natural Science Foundation of China (NNSFC) [20876100, 20476065, 20736004]
- Scientific Research Foundation for the ROCs of State Education Ministry
- State Key Lab. of Multiphase Reaction of the Chinese Academy of Science [20065]
- State Key Lab. of Coal Conversion, CAS [06-902]
- Key Lab. of Organic Synthesis of Jiangsu Prov.
- Chemical Experiment Center of Soochow Univ.
- R&D Foundation of Nanjing Medical Univ. [NY0586]
Fe3O4 magnetic nanoparticles (MNPs) were synthesized by the co-precipitation of Fe3+ and Fe2+ with ammonium hydroxide. The sodium citrate-modified Fe3O4 MNPs were prepared under Ar protection and were characterized by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), X-ray powder diffraction (XRD) and vibrating sample magnetometer (VSM). To improve the oxidation resistance of Fe3O4 MNPs, a silica layer was coated onto the modified and unmodified MNPs by the hydrolysis of tetraethoxysilane (TEOS) at 50 degrees C and pH 9. Afterwards, the silica-coated Fe3O4 core/shell MNPs were modified by oleic acid (OA) and were tested by IR and VSM. IR results revealed that the OA was successfully grafted onto the silica shell. The Fe3O4/SiO2 core/shell MNPs modified by OA were used to prepare water-based ferrofluids (FFs) using PEG as the second layer of surfactants. The properties of FFs were characterized using a UV-vis spectrophotometer, a Gouy magnetic balance, a laser particle size analyzer and a Brookfield LVDV-III+ rheometer. (C) 2008 Elsevier B. V. All rights reserved.
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