Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/184298
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Particle interactions in liquid magnetic colloids by zero field cooled measurements: Effects on heating efficiency |
Autor: | Presa, Patricia de la CSIC ORCID; Luengo, Y.; Velasco, V.; Morales, M. P. CSIC ORCID ; Iglesias, M.; Veintemillas-Verdaguer, S. CSIC ORCID ; Crespo, P.; Hernando, A. | Fecha de publicación: | 21-may-2015 | Editor: | American Chemical Society | Citación: | Journal of Physical Chemistry C 119(20): 11022-11030 (2015) | Resumen: | The influence of magnetic interactions in assemblies formed by either aggregated or disaggregated uniform γ-Fe2O3 particles are investigated as a function of particle size, concentration, and applied field. Hyperthermia and magnetization measurements are performed in the liquid phase of colloids consisting of 8 and 13 nm uniform γ-Fe2O3 particles dispersed in water and hexane. Although hexane allows obtaining the disagglomerated particle system, aggregation is observed in the case of water colloids. The zero field cooled (ZFC) curves show a discontinuity in the magnetization values associated with the melting points of water and hexane. Additionally, for 13 nm γ-Fe2O3 dispersed in hexane, a second magnetization jump is observed that depends on particle concentration and shifts toward lower temperature by increasing applied field. This second jump is related to the strength of the magnetic interactions as it is only present in disagglomerated particle systems with the largest size, i.e., is not observed for 8 nm superparamagnetic particles, and surface effects can be discarded. The specific absorption rate (SAR) decreases with increasing concentration only for the hexane colloid, whereas for aqueous colloids, the SAR is almost independent of particle concentration. Our results suggest that, as a consequence of the magnetic interactions, the dipolar field acting on large particles increases with concentration, leading to a decrease of the SAR. | Versión del editor: | https://doi.org/10.1021/jp5115515 | URI: | http://hdl.handle.net/10261/184298 | DOI: | 10.1021/jp5115515 | Identificadores: | doi: 10.1021/jp5115515 e-issn: 1932-7455 issn: 1932-7447 |
Aparece en las colecciones: | (ICMM) Artículos |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
---|---|---|---|---|
accesoRestringido.pdf | 15,38 kB | Adobe PDF | Visualizar/Abrir |
CORE Recommender
SCOPUSTM
Citations
50
checked on 18-abr-2024
WEB OF SCIENCETM
Citations
47
checked on 25-feb-2024
Page view(s)
191
checked on 24-abr-2024
Download(s)
36
checked on 24-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.