Issue 16, 2011

A two-step ligand exchange reaction generates highly water-dispersed magnetic nanoparticles for biomedical applications

Abstract

The high-temperature thermolysis of fatty acid–iron complexes generates magnetic nanoparticles (MNPs) of a precisely controlled size coated with fatty acids and dispersed in oil. Because they are water-immiscible, MNPs are unsuitable for water-based biomedical applications. Ligand exchange reactions that transform oil- into water-dispersed MNPs have attracted considerable attention, but are difficult to perform. In this paper, we report the successful preparation of size-controlled and highly water-dispersed MNPs, which have 4, 8 and 20 nm diameter by a unique two-step ligand exchange reaction. As temporary ligands, we selected thiomalic acid (TMA), which possesses moderate affinity toward MNPs and is soluble in both oil and water to remove fatty acids by XANES analyses. Next we selected the citric acids as secondary ligands for TMA-exchanged MNPs to be highly dispersed in water to remove TMA from the surface of MNPs. And the resulting highly water-dispersed MNPs are expected to be available as MRI contrast agents and hyperthermia carriers.

Graphical abstract: A two-step ligand exchange reaction generates highly water-dispersed magnetic nanoparticles for biomedical applications

Supplementary files

Article information

Article type
Paper
Submitted
15 Dec 2010
Accepted
16 Feb 2011
First published
14 Mar 2011

J. Mater. Chem., 2011,21, 5959-5966

A two-step ligand exchange reaction generates highly water-dispersed magnetic nanoparticles for biomedical applications

M. Hatakeyama, H. Kishi, Y. Kita, K. Imai, K. Nishio, S. Karasawa, Y. Masaike, S. Sakamoto, A. Sandhu, A. Tanimoto, T. Gomi, E. Kohda, M. Abe and H. Handa, J. Mater. Chem., 2011, 21, 5959 DOI: 10.1039/C0JM04381H

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