Hydrothermal synthesis of surface-modified iron oxide nanoparticles
Hydrothermal synthesis of surface-modified iron oxide nanoparticles
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DOI：
10.1016/j.matlet.2007.03.024
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发表时间：
2007-10-01
影响因子：
3
通讯作者：
Adschiri, Tadafumi
中科院分区：
文献类型：
--
作者：
Takami, Seiichi;Sato, Teruyuki;Adschiri, Tadafumi
本文采用常温下不与水混溶的正癸酸（C9H19COOH）或正癸胺（C10H21NH2），在473 K下加热硫酸铁（FeSO4）水溶液，合成了表面修饰的水相氧化铁纳米颗粒。透射电镜显示，正癸酸或癸胺的加入改变了纳米颗粒的形状。x射线衍射分析表明，合成的纳米颗粒为α - fe2o3或Fe3O4相，傅里叶变换红外光谱和热重分析表明，纳米颗粒表面存在有机层。在合成条件下，降低水在较高温度下的介电常数，提高了正癸酸或正癸胺在水中的溶解度，促进了氧化铁纳米颗粒表面与有机试剂的反应。合成后，所使用的有机改性剂在室温下从水相中分离出来，这可能有助于表面改性金属氧化物纳米颗粒的环保合成。(C) 2007 Elsevier B.V.版权所有
We synthesized surface-modified iron oxide nanoparticles in aqueous phase by heating an aqueous solution of iron sulfate (FeSO4) at 473 K with a small amount of either n-decanoic acid (C9H19COOH) or n-decylamine (C10H21NH2), which is not miscible with water at room temperature. Transmission electron microscopy showed that the addition of n-decanoic acid or decylamine changed the shape of the obtained nanoparticles. X-ray diffraction spectra revealed that the synthesized nanoparticles were in alpha-Fe2O3 or Fe3O4 phase while Fourier transform infrared spectroscopy and thermogravimetry indicated the existence of an organic layer on the surface of the nanoparticles. In the synthetic condition, decreased dielectric constant of water at higher temperature increased the solubility of n-decanoic acid or n-decylamine in water to promote the reaction between the surface of iron oxide nanoparticles and the organic reagents. After the synthesis, the used organic modifiers separated from the aqueous phase at room temperature, which may help the environmentally benign synthesis of surface-modified metal oxide nanoparticles. (C) 2007 Elsevier B.V. All rights reserved.