Advanced search
Start date
Betweenand
Related content
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Role of zinc substitution in magnetic hyperthermia properties of magnetite nanoparticles: interplay between intrinsic properties and dipolar interactions

Full text
Author(s):
Hadadian, Yaser [1] ; Ramos, Ana Paula [2] ; Pavan, Theo Z. [1]
Total Authors: 3
Affiliation:
[1] Univ Sao Paulo, Dept Phys, FFCLRP, Ave Bandeirantes, 3900 Vila Monte Alegre, Ribeirao Preto, SP - Brazil
[2] Univ Sao Paulo, FFCLRP, Dept Chem, Ave Bandeirantes, 3900 Vila Monte Alegre, BR-14040900 Ribeirao Preto, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: SCIENTIFIC REPORTS; v. 9, DEC 2 2019.
Web of Science Citations: 0
Abstract

Optimizing the intrinsic properties of magnetic nanoparticles for magnetic hyperthermia is of considerable concern. In addition, the heating efficiency of the nanoparticles can be substantially influenced by dipolar interactions. Since adequate control of the intrinsic properties of magnetic nanoparticles is not straightforward, experimentally studying the complex interplay between these properties and dipolar interactions affecting the specific loss power can be challenging. Substituting zinc in magnetite structure is considered as an elegant approach to tune its properties. Here, we present experimental and numerical simulation results of magnetic hyperthermia studies using a series of zinc-substituted magnetite nanoparticles (ZnxFe1-xFe2O4, x = 0.0, 0.1, 0.2, 0.3 and 0.4). All experiments were conducted in linear regime and the results were inferred based on the numerical simulations conducted in the framework of the linear response theory. The results showed that depending on the nanoparticles intrinsic properties, interparticle interactions can have different effects on the specific loss power. When dipolar interactions were strong enough to affect the heating efficiency, the parameter sigma = KeffV/k(B)T (K-eff is the effective anisotropy and V the volume of the particles) determined the type of the effect. Finally, the sample x = 0.1 showed a superior performance with a relatively high intrinsic loss power 5.4 nHm(2)kg(-)(1). (AU)

FAPESP's process: 13/18854-6 - Photoacoustic and ultrasound imaging applied to tissue characterization
Grantee:Theo Zeferino Pavan
Support Opportunities: Research Grants - Young Investigators Grants