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

Autor(es)

Hadadian, Yaser ^[1] ; Ramos, Ana Paula ^[2] ; Pavan, Theo Z. ^[1]

Afiliação do(s) autor(es)

^[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

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 9, DEC 2 2019.
• Citações Web of Science: 0

Resumo

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)

• Processo FAPESP: 13/18854-6 - Imagens fotoacústicas e ultrassônicas para caracterização de tecidos viscoelásticos
• Beneficiário: Theo Zeferino Pavan
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores