Magnetic field synthesis of Fe3O4 nanoparticles used as a precursor of ferrofluids
Magnetic field synthesis of Fe3O4 nanoparticles used as a precursor of ferrofluids
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DOI：
10.1016/j.jmmm.2006.07.026
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发表时间：
2007-03-01
影响因子：
2.7
通讯作者：
Han, Sijin
中科院分区：
文献类型：
--
作者：
Hong, R. Y.;Pan, T. T.;Han, Sijin
本文介绍了磁性Fe 3 O 4纳米粒子的合成方法和表面修饰方法。在这些方法中，Fe 3 O 4纳米粒子是通过共沉淀法制备的，并通过施加磁场来改善纳米粒子的老化。采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、X射线粉末衍射（XRD）和振动样品磁强计（VSM）对所得纳米粒子进行了表征。之后，为了提高纳米粒子和水之间的相容性，开发了一种有效的表面改性方法，通过接枝丙烯酸到纳米粒子表面。采用FT-IR、XRD、TEM和TG对样品进行了表征。测试结果表明，聚丙烯酸链已共价键合到磁性Fe 3 O 4纳米粒子的表面。研究了引发剂用量、单体浓度、反应温度对表面改性Fe 3 O 4纳米粒子性能的影响。此外，Fe 3 O 4-g-PAA杂化纳米粒子分散在水中形成铁磁流体（FF）。采用紫外可见分光光度计、古伊磁天平和激光粒度分析仪对所制备的FF进行了表征。测试结果表明，高浓度FF具有良好的稳定性，具有高磁化率和高饱和磁化强度。还使用旋转流变仪研究了FF的流变性能。(c)2006 Elsevier B. V.保留所有权利。
Methods to synthesize magnetic Fe3O4 nanoparticles and to modify the nanoparticle surface are presented in this paper. In these methods, Fe3O4 nanoparticles were prepared by co-precipitation, and the aging of nanoparticles was improved by applied magnetic field. The obtained nanoparticles were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray powder diffraction (XRD), and vibrating sample magnetometer (VSM). Thereafter, to enhance the compatibility between nanoparticles and water, an effective surface modification method was developed by grafting acrylic acid onto the nanoparticle surface. FT-IR, XRD, transmission electron microscopy (TEM), and thermogravimetry (TG) were used to characterize the resultant sample. The testing results indicated that the polyacrylic acid chains have been covalently bonded to the surface of magnetic Fe3O4 nanoparticles. The effects of initiator dosage, monomer concentration, and reaction temperature on the characteristics of surface-modified Fe3O4 nanoparticles were investigated. Moreover, the Fe3O4-g-PAA hybrid nanoparticles were dispersed in water to form ferrofluids (FFs). The obtained FFs were characterized by UV-vis spectrophotometer, Gouy magnetic balance and laser particle-size analyzer. The testing results showed that the high-concentration FF had excellent stability, with high susceptibility and high saturation magnetization. The rheological properties of the FFs were also investigated using a rotating rheometer. (c) 2006 Elsevier B.V. All rights reserved.