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New insights into the heating mechanisms and self-regulating abilities of manganite perovskite nanoparticles suitable for magnetic fluid hyperthermia.

hal.structure.identifierInstituto de Ciencia de Materiales de Aragón [Saragoza, España] [ICMA-CSIC]
dc.contributor.authorNATIVIDAD, Eva
hal.structure.identifierInstituto de Ciencia de Materiales de Aragón [Saragoza, España] [ICMA-CSIC]
dc.contributor.authorCASTRO, Miguel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGOGLIO, Graziella
hal.structure.identifierInstituto de Ciencia de Materiales de Aragón [Saragoza, España] [ICMA-CSIC]
dc.contributor.authorANDREU, Irene
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorEPHERRE, Romain
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDUGUET, Etienne
hal.structure.identifierInstituo de Investigacion en Ingenierıa de Aragon
dc.contributor.authorMEDIANO, Arturo
dc.date.issued2012
dc.identifier.issn2040-3364
dc.description.abstractEnThe heating and self-regulating abilities of La(1-x)Sr(x)MnO(3+Δ) ferromagnetic nanoparticles for magnetic fluid hyperthermia are studied. The samples, synthesized by the Glycine Nitrate Process, present non-agglomerated particles but are partially constituted by polycrystalline nanoparticles, displaying average crystallite diameters ranging from 21 to 31 nm. The strontium content of these nanoparticles, between 0.14 and 0.39, is associated with non-stoichiometry effects in the materials, and both govern their Curie temperatures (T(C)), which range between 13 and 86 °C, respectively. Heating experiments carried out on samples suspended in an aqueous agarose gel and with different alternating magnetic fields derive unexpected maximum temperatures that cannot be explained on the basis of static magnetization data. The measurement of the thermal dependence of the specific absorption rate (SAR) of nanopowders by adiabatic magnetothermia reveals the existence of a dissipation peak just below T(C), which is assigned to a Hopkinson peak. This thermal dependence of SAR, together with a simple thermal model that considers a linear approximation for the heat power losses, is crucial to clarify the behavior observed in heating experiments and also to discuss the possibilities of the samples as self-regulating hyperthermia mediators. This analysis emphasizes that, for the correct design of a self-regulating system, the heat power losses determined by the surrounding conditions must be taken into account as well as the heating capacity of the magnetic nanoparticles.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subject.enHyperthermia
dc.subject.enFerromagnetism
dc.subject.enNanoparticles
dc.subject.enSolid solution
dc.title.enNew insights into the heating mechanisms and self-regulating abilities of manganite perovskite nanoparticles suitable for magnetic fluid hyperthermia.
dc.typeArticle de revue
dc.identifier.doi10.1039/c2nr30667k
dc.subject.halChimie/Matériaux
bordeaux.journalNanoscale
bordeaux.page3954-3962
bordeaux.volume4
bordeaux.issue13
bordeaux.peerReviewedoui
hal.identifierhal-00720445
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00720445v1
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