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Título

Relaxation time diagram for identifying heat generation mechanisms in magnetic fluid hyperthermia

AutorLima Jr., Enio; Torres, T. E.; Marquina, Clara; Ibarra, M. Ricardo; Goya, Gerardo F.
Palabras claveSuperparamagnetism
Specific power absorption
Nanoparticles
Brown relaxation
Néel relaxation
Magnetic losses
Magnetic hyperthermia
Fecha de publicación2014
EditorSpringer
CitaciónJournal of Nanoparticle Research 16: 2791 (2014)
ResumenWe present a versatile diagram to envisage the dominant relaxation mechanism of single-domain magnetic nanoparticles (MNPs) under alternating magnetic fields, as those used in magnetic fluid hyperthermia (MFH). The diagram allows estimating the heating efficiency, measured by the Specific Power Absorption (SPA), originated in the magnetic and viscous relaxation times of single-domain MNPs for a given frequency of the ac magnetic field (AFM). The diagram has been successfully applied to different colloids, covering a wide variety of MNPs with different magnetic anisotropy and particle size, and dispersed in different viscous liquid carriers. From the general diagram, we derived a specific chart based on the Linear Response Theory in order to easily estimate the experimental condition for the optimal SPA values of most colloids currently used in MFH.
Descripciónet al.
URIhttp://hdl.handle.net/10261/120905
DOI10.1007/s11051-014-2791-6
Identificadoresdoi: 10.1007/s11051-014-2791-6
issn: 1388-0764
e-issn: 1572-896X
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