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Specific absorption rate dependence on temperature in magnetic field hyperthermia measured by dynamic hysteresis losses (ac magnetometry).

hal.structure.identifierUniversidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]
dc.contributor.authorGARAIO, Eneko
hal.structure.identifierLaboratoire de Chimie des Polymères Organiques [LCPO]
hal.structure.identifierTeam 3 LCPO : Polymer Self-Assembly & Life Sciences
dc.contributor.authorSANDRE, Olivier
hal.structure.identifierUniversidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]
dc.contributor.authorCOLLANTES, Juan-Mari
hal.structure.identifierUniversidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]
dc.contributor.authorGARCIA, Jose Angel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMORNET, Stéphane
hal.structure.identifierUniversidad del País Vasco [Espainia] / Euskal Herriko Unibertsitatea [España] = University of the Basque Country [Spain] = Université du pays basque [Espagne] [UPV / EHU]
dc.contributor.authorPLAZAOLA, Fernando
dc.date.issued2015
dc.identifier.issn0957-4484
dc.description.abstractEnMagnetic nanoparticles (NPs) are intensively studied for their potential use for magnetic hyperthermia, a treatment that has passed a phase II clinical trial against severe brain cancer (glioblastoma) at the end of 2011. Their heating power, characterized by the 'specific absorption rate (SAR)', is often considered temperature independent in the literature, mainly because of the difficulties that arise from the measurement methodology. Using a dynamic magnetometer presented in a recent paper, we measure here the thermal dependence of SAR for superparamagnetic iron oxide (maghemite) NPs of four different size-ranges corresponding to mean diameters around 12 nm, 14 nm, 15 nm and 16 nm. The article reports a parametrical study extending from 10 to 60 °C in temperature, from 75 to 1031 kHz in frequency, and from 2 to 24 kA m(-1) in magnetic field strength. It was observed that SAR values of smaller NPs decrease with temperature whereas for the larger sample (16 nm) SAR values increase with temperature. The measured variation of SAR with temperature is frequency dependent. This behaviour is fully explained within the scope of linear response theory based on Néel and Brown relaxation processes, using independent magnetic measurements of the specific magnetization and the magnetic anisotropy constant. A good quantitative agreement between experimental values and theoretical values is confirmed in a tri-dimensional space that uses as coordinates the field strength, the frequency and the temperature.
dc.language.isoen
dc.publisherInstitute of Physics
dc.title.enSpecific absorption rate dependence on temperature in magnetic field hyperthermia measured by dynamic hysteresis losses (ac magnetometry).
dc.typeArticle de revue
dc.identifier.doi10.1088/0957-4484/26/1/015704
dc.subject.halChimie/Matériaux
dc.subject.halSciences de l'ingénieur [physics]/Electromagnétisme
dc.description.sponsorshipEuropeMultifunctional Nanoparticles for Magnetic Hyperthermia and Indirect Radiation Therapy
bordeaux.journalNanotechnology
bordeaux.page015704
bordeaux.volume26
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-01226822
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01226822v1
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