Issue 34, 2011
From the journal:

Dalton Transactions

Synthesis and characterization of bracelet-like magnetic nanorings consisting of Ag–Fe3O4 bi-component nanoparticles†

Shuai Zhoua  and  Qianwang Chen*a  

* Corresponding authors

a Hefei National Laboratory for Physical Sciences at Microscale and Department of Materials Science & Engineering, University of Science and Technology of China, Hefei, China
E-mail: cqw@ustc.edu.cn
Fax: +81 551 3607292
Tel: +81 551 3607292

Abstract

Stable bracelet-like magnetic nanorings, formed by Ag–Fe3O4nanoparticles with an average size around 40 nm, have been successfully prepared in large scale by means of reducing Ag+ and Fe3+ simultaneously under mild conditions. In the reaction, tiny grains of silver are used as seeds to prompt small Fe3O4 nanoparticles to grow larger, which is essential to enhance the magnetic dipole–dipole interactions, while only superparamagnetic Fe3O4 nanoparticles (about 10 nm in size) can be obtained in the absence of Ag seeds. The XRD, TEM, SAED and the EDS line scan data reveal that these nanoparticles are in the core–shell structure. These magnetic Ag–Fe3O4 nanoparticles assembled into nanorings by magnetic dipole–dipole interactions with a diameter of 100–200 nm. The saturation magnetization of the nanorings is 39.5 emu g−1 at room temperature. The MRI images indicate that these kind of nanorings have the potential application in diagnostics as a T2MRI contrast agent.

Graphical abstract: Synthesis and characterization of bracelet-like magnetic nanorings consisting of Ag–Fe3O4 bi-component nanoparticles

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Article information

DOI
https://doi.org/10.1039/C1DT10733J
Article type
Paper
Submitted
21 Apr 2011
Accepted
16 Jun 2011
First published
29 Jul 2011

Dalton Trans., 2011,40, 8622-8629

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Synthesis and characterization of bracelet-like magnetic nanorings consisting of Ag–Fe3O4 bi-component nanoparticles

S. Zhou and Q. Chen, Dalton Trans., 2011, 40, 8622 DOI: 10.1039/C1DT10733J

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