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...
| Authors: | ; ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2017 |
| Country: | España |
| Institution: | Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya) |
| Repository: | Recercat. Dipósit de la Recerca de Catalunya |
| OAI Identifier: | oai:recercat.cat:2445/158459 |
| Online Access: | https://hdl.handle.net/2445/158459 |
| Access Level: | Open access |
| Keyword: | Nanopartícules Magnetita Propietats magnètiques Nanoparticles Magnetite Magnetic properties |
| _version_ | 1878731088684122112 |
|---|---|
| author | Perez, Nicolas |
| author2 | Moya Álvarez, Carlos Tartaj, P. Labarta, Amílcar Batlle Gelabert, Xavier |
| author2_role | author author author author |
| author_browse | Batlle Gelabert, Xavier Labarta, Amílcar Moya Álvarez, Carlos Perez, Nicolas Tartaj, P. |
| author_facet | Perez, Nicolas Moya Álvarez, Carlos Tartaj, P. Labarta, Amílcar Batlle Gelabert, Xavier |
| author_role | author |
| collection | Recercat. Dipósit de la Recerca de Catalunya |
| 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. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | ES_28b2dd6bbc17ae2e644cfeb4fcc09e8d |
| institution | 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) |
| network_acronym_str | ES |
| network_name_str | España |
| oai_identifier_str | oai:recercat.cat:2445/158459 |
| publishDate | 2017 |
| publishDateSort | 2017 |
| publisher | American Institute of Physics |
| publisherStr | American Institute of Physics |
| reponame_str | Recercat. Dipósit de la Recerca de Catalunya |
| spelling | Aggregation state and magnetic properties of magnetite nanoparticles controlled by an optimized silica coating Perez, Nicolas Moya Álvarez, Carlos Tartaj, P. Labarta, Amílcar Batlle Gelabert, Xavier Nanopartícules Magnetita Propietats magnètiques Nanoparticles Magnetite Magnetic properties 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. American Institute of Physics https://hdl.handle.net/2445/158459 |
| 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 |
| status_str | publishedVersion |
| title | 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_short | 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 |
| topic | Nanopartícules Magnetita Propietats magnètiques Nanoparticles Magnetite Magnetic properties |
| topic_facet | Nanopartícules Magnetita Propietats magnètiques Nanoparticles Magnetite Magnetic properties |
| url | https://hdl.handle.net/2445/158459 |