Comparative Study of the Magnetic Behavior of Spherical and Cubic Superparamagnetic Iron Oxide Nanoparticles

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• 作者：Guoliang Zhen ; Benjamin W. Muir ; Bradford A. Moffat ; Peter Harbour ; Keith S. Murray ; Boujemaa Moubaraki ; Kiyonori Suzuki ; Ian Madsen ; Nicki Agron-Olshina ; Lynne Waddington ; Paul Mulvaney ; Patrick G. Hartley
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：January 20, 2011
• 年：2011
• 卷：115
• 期：2
• 页码：327-334
• 全文大小：331K
• 年卷期：v.115,no.2(January 20, 2011)
• ISSN：1932-7455

文摘

A modified method for the production of cubic and spherical superparamagnetic nanoparticles is presented. Cubic nanoparticles can be made that are highly monodisperse down to a diameter of 8 nm. A detailed study is presented of the physical properties of these nanoparticles using high-resolution transmission electron microscopy analysis, X-ray powder diffraction, superconducting quantum interference device measurements, and relaxivity measurements performed in a magnetic resonance imaging scanner. It is found that cubic iron oxide nanoparticles have a higher degree of crystallinity and relaxivity (four times higher) than their spherical counterparts. These novel cubic iron oxide nanoparticles show great promise for use in biomedical imaging applications.