Preparation and Characterization of Solvent-free Fe3O4 Nanofluids

doi:10.3969/j.issn.0251-0790.2012.01.035

Abstract

Abstract: The surfactant was used to functionalize the nanoparticles to prepare solvent-free nanofluids. To prevent Fe₃O₄ nanoparticles from agglomerating and improve the dispersion of Fe₃O₄ nanoparticles, the solvent-free Fe₃O₄ nanofluids were synthesized through surface modification. Magnetic Fe₃O₄ nanoparticles were firstly prepared by chemical co-precipitation method. Then graft the quaternary ammonium salt (CH₃O)₃Si(CH₂)₃N⁺(CH₃)₂(C₁₈H₃₇)Cl^-, which has silanol groups, on Fe₃O₄ nanoparticles with hydroxyl groups. Finally, the chloridion was replaced with the anion C₉H₁₉—C₆H₄(OCH₂CH₂)₂₀O(CH₂)₃SO₃ through an ion-exchang process. An organic layer was formed on the surface of Fe₃O₄ nanoparticles, and made the Fe₃O₄ nanoparticles from black powder to brown fluid(at room temperature). The solvent-free Fe₃O₄ nanofluids were characterized by X-ray diffraction, Fourier transform infrared spectrum, differential scanning calorimetry, thermogravimetric analysis, transmission electron microscopy and rheometer. The Fe₃O₄ nanoparticles were monodispersed in solvent-free nanofluids, and the content of Fe₃O₄ nanoparticles in the nanofluids proved to be about 12%. The loss shear modulus G″ was higher than the storage shear modulus G'.

Key words: Solvent-free nanofluid, Surface modification, Fe₃O₄ nanoparticles

CLC Number:

O631
O647.2

TrendMD:

TAN Yu-Mo, ZHENG Ya-Ping, LAN Lan. Preparation and Characterization of Solvent-free Fe₃O₄ Nanofluids[J]. Chem. J. Chinese Universities, 2012, 33(01): 206.

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Preparation and Characterization of Solvent-free Fe₃O₄ Nanofluids

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