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Effect of size, composition, and morphology on magnetic performance: First-order reversal curves evaluation of iron oxide nanoparticles
ETH, Dept Earth Sci, Inst Geophys, CH-8092 Zurich, Switzerland..
ETH, Dept Mech & Proc Engn, Inst Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland.;Harvard Univ, Dept Environm Hlth, Boston, MA 02115 USA..ORCID iD: 0000-0001-5040-620X
ETH, Dept Mech & Proc Engn, Inst Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland.;Univ Cambridge, Dept Engn, Cambridge CB3 0FA, England..
ETH, Dept Mech & Proc Engn, Inst Proc Engn, Particle Technol Lab, CH-8092 Zurich, Switzerland.;DSM Nutr Prod Ltd, CH-4002 Basel, Switzerland..
2014 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 115, no 4, 044314Article in journal (Refereed) Published
Abstract [en]

Superparamagnetic nanoparticles are employed in a broad range of applications that demand detailed magnetic characterization for superior performance, e. g., in drug delivery or cancer treatment. Magnetic hysteresis measurements provide information on saturation magnetization and coercive force for bulk material but can be equivocal for particles having a broad size distribution. Here, first-order reversal curves (FORCs) are used to evaluate the effective magnetic particle size and interaction between equally sized magnetic iron oxide (Fe2O3) nanoparticles with three different morphologies: (i) pure Fe2O3, (ii) Janus-like, and (iii) core/shell Fe2O3/SiO2 synthesized using flame technology. By characterizing the distribution in coercive force and interaction field from the FORC diagrams, we find that the presence of SiO2 in the core/shell structures significantly reduces the average coercive force in comparison to the Janus-like Fe2O3/SiO2 and pure Fe2O3 particles. This is attributed to the reduction in the dipolar interaction between particles, which in turn reduces the effective magnetic particle size. Hence, FORC analysis allows for a finer distinction between equally sized Fe2O3 particles with similar magnetic hysteresis curves that can significantly influence the final nanoparticle performance. (C) 2014 AIP Publishing LLC.

Place, publisher, year, edition, pages
2014. Vol. 115, no 4, 044314
National Category
Nano Technology
Identifiers
URN: urn:nbn:se:uu:diva-317815DOI: 10.1063/1.4863543ISI: 000331210800106OAI: oai:DiVA.org:uu-317815DiVA: diva2:1083081
Available from: 2017-03-20 Created: 2017-03-20 Last updated: 2017-03-20

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Sotiriou, Georgios A.Teleki, Alexandra
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