Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating

The control of magnetic interactions is becoming essential to expand/improve the applicability of magnetic nanoparticles (NPs). Here, we show that an optimized microemulsion method can be used to obtain homogenous silica coatings on even single magnetic nuclei of highly crystalline Fe3-xO4 NPs (7 an...

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Detalles Bibliográficos
Autores: Perez, Nicolas, Moya Álvarez, Carlos, Tartaj, P., Labarta, Amílcar, Batlle Gelabert, Xavier
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/158459
Acceso en línea:https://hdl.handle.net/2445/158459
Access Level:acceso abierto
Palabra clave:Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
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spelling Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coatingPerez, NicolasMoya Álvarez, CarlosTartaj, P.Labarta, AmílcarBatlle Gelabert, XavierNanopartículesMagnetitaPropietats magnètiquesNanoparticlesMagnetiteMagnetic propertiesThe control of magnetic interactions is becoming essential to expand/improve the applicability of magnetic nanoparticles (NPs). Here, we show that an optimized microemulsion method can be used to obtain homogenous silica coatings on even single magnetic nuclei of highly crystalline Fe3-xO4 NPs (7 and 16nm) derived from a high-temperature method. We show that the thickness of this coating is controlled almost at will allowing much higher average separation among particles as compared to the oleic acid coating present on pristine NPs. Magnetic susceptibility studies show that the thickness of the silica coating allows the control of magnetic interactions. Specifically, as this effect is better displayed for the smallest particles, we show that dipole-dipole interparticle interactions can be tuned progressively for the 7 nm NPs, from almost non-interacting to strongly interacting particles at room temperature. The quantitative analysis of the magnetic properties unambiguously suggests that dipolar interactions significantly broaden the effective distribution of energy barriers by spreading the distribution of activation magnetic volumes. Published by AIP Publishing.American Institute of Physics2020202020172020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://hdl.handle.net/2445/158459Articles publicats en revistes (Física de la Matèria Condensada)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésReproducció del document publicat a: https://doi.org/10.1063/1.4974532Journal of Applied Physics, 2017, vol. 121, num. 4, p. 44304https://doi.org/10.1063/1.4974532(c) American Institute of Physics , 2017info:eu-repo/semantics/openAccessoai:recercat.cat:2445/1584592026-05-29T05:05:01Z
dc.title.none.fl_str_mv Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
title Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
spellingShingle Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
Perez, Nicolas
Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
title_short Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
title_full Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
title_fullStr Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
title_full_unstemmed Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
title_sort Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating
dc.creator.none.fl_str_mv Perez, Nicolas
Moya Álvarez, Carlos
Tartaj, P.
Labarta, Amílcar
Batlle Gelabert, Xavier
author Perez, Nicolas
author_facet Perez, Nicolas
Moya Álvarez, Carlos
Tartaj, P.
Labarta, Amílcar
Batlle Gelabert, Xavier
author_role author
author2 Moya Álvarez, Carlos
Tartaj, P.
Labarta, Amílcar
Batlle Gelabert, Xavier
author2_role author
author
author
author
dc.subject.none.fl_str_mv Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
topic Nanopartícules
Magnetita
Propietats magnètiques
Nanoparticles
Magnetite
Magnetic properties
description The control of magnetic interactions is becoming essential to expand/improve the applicability of magnetic nanoparticles (NPs). Here, we show that an optimized microemulsion method can be used to obtain homogenous silica coatings on even single magnetic nuclei of highly crystalline Fe3-xO4 NPs (7 and 16nm) derived from a high-temperature method. We show that the thickness of this coating is controlled almost at will allowing much higher average separation among particles as compared to the oleic acid coating present on pristine NPs. Magnetic susceptibility studies show that the thickness of the silica coating allows the control of magnetic interactions. Specifically, as this effect is better displayed for the smallest particles, we show that dipole-dipole interparticle interactions can be tuned progressively for the 7 nm NPs, from almost non-interacting to strongly interacting particles at room temperature. The quantitative analysis of the magnetic properties unambiguously suggests that dipolar interactions significantly broaden the effective distribution of energy barriers by spreading the distribution of activation magnetic volumes. Published by AIP Publishing.
publishDate 2017
dc.date.none.fl_str_mv 2017
2020
2020
2020
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/158459
url https://hdl.handle.net/2445/158459
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Reproducció del document publicat a: https://doi.org/10.1063/1.4974532
Journal of Applied Physics, 2017, vol. 121, num. 4, p. 44304
https://doi.org/10.1063/1.4974532
dc.rights.none.fl_str_mv (c) American Institute of Physics , 2017
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) American Institute of Physics , 2017
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Institute of Physics
publisher.none.fl_str_mv American Institute of Physics
dc.source.none.fl_str_mv Articles publicats en revistes (Física de la Matèria Condensada)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.811543

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