Shaping iron oxide nanocrystals for magnetic separation applications

Iron oxide nanostructures are attractive for a variety of bio-related applications given their wide range of magnetic properties. Here, we report on the study of the magnetophoretic mobility of octapod-shaped nanocrystals, which we relate to stoichiometry, quality and elongation in the 111 direction...

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Bibliographic Details
Published in:Nanoscale 2018-11, Vol.10 (43), p.20462-20467
Main Authors: Testa-Anta, Martín, Liébana-Viñas, Sara, Rivas-Murias, Beatriz, Rodríguez González, Benito, Farle, Michael, Salgueiriño, Verónica
Format: Article
Language:English
Subjects:
Anisotropy
Coercivity
Drug delivery systems
Elongated structure
Iron oxides
Magnetic permeability
Magnetic properties
Magnetic separation
Morphology
Nanocrystals
Size distribution
Stoichiometry
Wustite
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Summary:Iron oxide nanostructures are attractive for a variety of bio-related applications given their wide range of magnetic properties. Here, we report on the study of the magnetophoretic mobility of octapod-shaped nanocrystals, which we relate to stoichiometry, quality and elongation in the 111 direction of these cubic structures. This special morphology combines magnetocrystalline anisotropies, increases shape anisotropy and hinders the formation of an epitaxial wüstite-magnetite interface. As a result, one obtains nanocrystals with large magnetic susceptibility and small coercivity, that is, with optimum characteristics for magnetic guidance, separation, and drug delivery, due to the increased magnetophoretic mobility displayed.
ISSN:2040-3364
2040-3372
DOI:10.1039/c8nr05864d