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Title

Aggregation effects on the magnetic properties of iron oxide colloids

AuthorsGutiérrez, Lucía ; Cueva, Leonor de la; Moros, María; Mazarío, Eva; Bernardo, Sara de; Fuente, Jesús M. de la; Morales, M. P. ; Salas, Gorka
KeywordsIron oxides
Colloids
Aggregation
Magnetic hyperthermia
Magnetic nanoparticles
Surface coating
Issue Date2019
PublisherInstitute of Physics Publishing
CitationNanotechnology 30(11): 112001 (2019)
AbstractMagnetic nanoparticles (MNPs), and in particular iron oxide nanoparticles (mainly magnetite and maghemite), are being widely used in the form of aqueous colloids for biomedical applications. In such colloids, nanoparticles tend to form assemblies, either aggregates, if the union is permanent, or agglomerates, if it is reversible. These clustering processes have a strong impact on the MNPs' properties that are often not well understood. In this review, the causes and consequences of MNPs aggregation/agglomeration are reviewed and discussed. Special attention has been paid to the impact of the MNPs aggregation/agglomeration on their magnetic properties and heating properties, when exposed to an alternating magnetic field in the frame of magnetic hyperthermia. In addition, a model system with MNPs of two different sizes coated with three different molecules oleic acid, meso-2, 3-dimercaptosuccinic acid and poly(maleic anhydride-alt-1-octadecene) has been characterized and the results used to support the ideas reviewed.
Publisher version (URL)https://doi.org/10.1088/1361-6528/aafbff
URIhttp://hdl.handle.net/10261/181504
DOI10.1088/1361-6528/aafbff
ISSN0957-4484
E-ISSN1361-6528
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(ICMA) Artículos
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