Magnetic properties of dendrimer-encapsulated iron nanoparticles containing an average of 55 and 147 atoms

Marc R. Knecht; Richard M. Crooks

doi:10.1039/B616471B

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New Journal of Chemistry

Issue 7, 2007

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Magnetic properties of dendrimer-encapsulated iron nanoparticles containing an average of 55 and 147 atoms

Marc R. Knecht and Richard M. Crooks

New J. Chem., 2007, 31, 1349-1353

DOI: 10.1039/B616471B
Received 09 Nov 2006, Accepted 11 Apr 2007
First published on the web 18 May 2007
This article is part of the collection: Dendrimers

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Abstract
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The synthesis, characterization and magnetic properties of Fe nanoparticles containing an average of 55 and 147 atoms are described. The nanoparticles are prepared using dendrimer templates, and therefore they are nearly size-monodisperse. In the absence of oxygen and water, the Fe nanoparticles are stable, but they decompose quickly when exposed to air. Magnetic analysis indicates that the 55-atom nanoparticles are superparamagnetic, but the 147-atom materials undergo a transition to ferromagnetic at 6 K. Both materials exhibit suppression of the magnetic saturation compared to bulk Fe.

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Large area EDS spectrum and time-resolved UV-vis analysis of G6-C ₁₂(Fe ₁₄₇)
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New Journal of Chemistry

Magnetic properties of dendrimer-encapsulated iron nanoparticles containing an average of 55 and 147 atoms

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