Issue 5, 2011
From the journal:

Dalton Transactions

Surfactant-assisted one-pot synthesis of superparamagnetic magnetite nanoparticle clusters with tunable cluster size and magnetic field sensitivity†

Takanari Togashi,*a   Takashi Naka,b   Shunsuke Asahina,cd   Koichi Sato,b   Seiichi Takamid  and  Tadafumi Adschiri*a  

* Corresponding authors

a Advanced Institute for Material Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan
E-mail: togashi@tagen.tohoku.ac.jp
Fax: +81-22-217-5631
Tel: +81-22-217-5630

b National Institute for Material Science, 1-2-1 Sengen, Tsukuba, Ibaraki, Japan

c JEOL (EUROPE) SAS, Escape Claude Monet-1 All'ee de Civerny, France

d Institute for Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Japan

Abstract

Magnetic nanoparticles (MNPs) have many potential biomedical applications. Improvements in their magnetic properties and solubility are necessary for these applications to realize their full potential. In this study, MNPs in the form of raspberry-like magnetite (Fe3O4) nanoparticle clusters, consisting of tiny Fe3O4 particles with a diameter of approximately 20 nm, were prepared under hydrothermal conditions at 200 °C in the presence of 3,4-dihydroxyhydroxysinnamic acid (DHCA). The primary particles were connected by DHCA molecules to form the clusters, which were well dispersed in water media because a COOH group from DHCA appeared on their surfaces. The cluster size could be tuned from 50 to 400 nm without changing the primary particle size by controlling the reaction time. Therefore, all prepared clusters displayed superparamagnetic properties at room temperature. In addition, the sensitivity of Fe3O4 to an external magnetic field could also be controlled by the cluster size.

Graphical abstract: Surfactant-assisted one-pot synthesis of superparamagnetic magnetite nanoparticle clusters with tunable cluster size and magnetic field sensitivity

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Article information

DOI
https://doi.org/10.1039/C0DT01280G
Article type
Paper
Submitted
24 Sep 2010
Accepted
25 Nov 2010
First published
16 Dec 2010

Dalton Trans., 2011,40, 1073-1078

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Surfactant-assisted one-pot synthesis of superparamagnetic magnetite nanoparticle clusters with tunable cluster size and magnetic field sensitivity

T. Togashi, T. Naka, S. Asahina, K. Sato, S. Takami and T. Adschiri, Dalton Trans., 2011, 40, 1073 DOI: 10.1039/C0DT01280G

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