Aggregation effects on the magnetic properties of iron oxide colloids

Magnetic nanoparticles, 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 agglomerat...

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Bibliographic Details
Published in:Nanotechnology Vol. 30; no. 11; p. 112001
Main Authors: Gutierrez, Lucia, de la Cueva, Leonor, Moros, Maria, Mazario, Eva, de Bernardo, Sara, de la Fuente, Jesus M, Morales, Maria Del Puerto, Salas, Gorka
Format: Journal Article
Language:English
Published: England 15.03.2019
Subjects:
Aggregation
surface coating
Magnetic hyperthermia
Iron oxides
colloids
magnetic nanoparticles
nanomagnetism
ISSN:1361-6528, 1361-6528
Online Access:Get more information
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Summary:Magnetic nanoparticles, 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 magnetic nanoparticles properties that are often not well understood. In this review, the causes and consequences of magnetic nanoparticles aggregation/agglomeration are reviewed and discussed. Special attention has been paid to the impact of the magnetic nanoparticles 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 magnetic nanoparticles 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 characterised and the results used to support the ideas reviewed.&#13.
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ISSN:1361-6528
1361-6528
DOI:10.1088/1361-6528/aafbff