Synthesis of Polycarboxylic Ligand Capped Fe3O4 Nanoparticles with Excellent Water-dispersibility via a Ligand-exchange Approach

doi:10.7503/cjcu20120626

Abstract

Abstract:

Monodispersed magnetic Fe₃O₄ nanoparticles(MNPs) capped with oleic acid(MNPs-OA) were synthesized through a thermal decomposition method. On this basis, four kinds of water-soluble Fe₃O₄ nano-particles(MNPs-CA, MNPs-SiCOOH, MNPs-BTCA and MNPs-EDTA) capped with four different polycarboxylic ligands, i.e., citric acid(CA), n-(trimethoxysilylpropyl)ethylene diamine triacetic acid(SiCOOH) trisodium salt, butane tetracarboxylic acid(BTCA) and ethylenediaminetetraacetic acid(EDTA) tetrasodium salt, were prepared via a ligand exchange approach. Among the four ligands, the BTCA and EDTA tetrasodium salt with four carboxy groups were first chosen to cap Fe₃O₄ nanoparticles. The morphology, structure, chemical composition and magnetic properties of the four water-dispersible MNPs were characterized by transmission electron microscope(TEM), X-ray diffractometer(XRD), vibrating sample magnetometer(VSM), Fourier transform infrared spectrometer(FTIR) and thermal gravimetric analyzer(TGA). The water-dispersibility and suface potential of four water-soluble MNPs in their aqueous solutions were also characterized by UV-visible spectrophotometer(UV-Vis) and Malvern Zetaszier analyzer, respectively. The results show that the resultant 15 nm Fe₃O₄ nanoparticles possess narrow size distribution and superparamagnetism. In addition, the polycarboxylic ligand capped MNPs display excellent dispersibility in their aqueous solutions. By the co-assembly of these MNPs and polyelectrolyte, we fabricated magnetic microcapsules. The microcapsules are of great potential in biomedical fields owing to the magnetic responsivity and MRI imaging capability of MNPs.

Key words: Fe₃O₄ magnetic nanoparticles, Thermal decomposition, Ligand exchange, Water-solubility, Polycarboxylic ligand

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JIANG Ze-Quan, SONG Sheng, DOU Hong-Jing, SUN Kang, WANG Yi-Ming, HUANG Chao-Fan, WEI Zhen-Hua, QU Guan-Xiong. Synthesis of Polycarboxylic Ligand Capped Fe₃O₄ Nanoparticles with Excellent Water-dispersibility via a Ligand-exchange Approach[J]. Chem. J. Chinese Universities, 2012, 33(12): 2609.

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Synthesis of Polycarboxylic Ligand Capped Fe₃O₄ Nanoparticles with Excellent Water-dispersibility via a Ligand-exchange Approach

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