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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 127, Issue 27, Pages 9731-9735Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja051351m
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Cationic superparamagnetic iron oxide nanoparticles were assembled using a series of anionic polyamicloamine dendrimers. The resulting assemblies featured systematically increasing average interparticle spacing over a 2.4 nm range with increasing dendrimer generation. This increase in spacing modulated the collective magnetic behavior by effective lowering of the dipolar coupling between particles. The results obtained in these studies deviate from the predicted dependence of collective behavior on interparticle spacing, suggesting that a dense assembly of magnetically free particles can exist with a surprisingly small space between particles.
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