resumo
The control of the Curie temperature can be used as an intrinsic safety switch for magnetic induction heating applications, such as magnetic hyperthermia, heat generation devices and heat dissipation systems. In this work we used a coprecipitation method to synthesize Zn-Fe ferrite superparamagnetic nanoparticles (ZnxFe3-xO4: x= 0, 0.15, 0.25, 0.35, 0.50, 0.65, 0.75, 0.85, 1) to tune their Curie temperature. The produced ZnxFe3-xO4 nanoparticles present diameters below 15 nm and crystallite sizes ranging from 10 to 4 nm, depending close to linearly on the Zn relative content. The ZnxFe3-xO4 nanoparticles saturation magnetization is highly dependent on the Zn relative content, having a maximum around the Zn0.25Fe2.75O4 composition. Finally, we propose an optimized composition range of these Zn-Fe ferrite superparamagnetic nanoparticles for near room temperature self-regulated heating napplications.
palavras-chave
MAGNETITE NANOPARTICLES; HYPERTHERMIA; COPRECIPITATION
categoria
Materials Science; Physics
autores
Horta, AC; André, P; Amaral, JS; Amaral, S; Amorim, CO
nossos autores
Carlos Amorim
Investigador Auxiliar
João Cunha de Sequeira Amaral
Investigador AuxiliarGrupos
G2 - Materiais Fotónicos, Eletrónicos e Magnéticos
G6 - Materiais Virtuais e Inteligência Artificial
Projectos
Collaboratory for Emerging Technologies, CoLab (EMERGING TECHNOLOGIES)
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
This work is financed by Portugal 2020 through European Regional Development Fund (ERDF) in the frame of CENTRO2020 in the scope of the project CICECO - Aveiro Institute of Materials, UIDB/50011/2020 & UIDP/50011/2020 & LA/P/0006/2020, and in the scope of LISBOA-01-0247-FEDER-039985/POCI-01-0247-FEDER-039985, LA/P/0037/2020, UIDP/50025/2020, and UIDB/50025/2020 of the Associate Laboratory Institute of Nanostructures, Nanomodelling and Nano-fabrication - i3N, financed by national funds through the FCT/MEC (PIDDAC). FCT is also acknowledged for grant 2020.05415.BD (A. C. Horta).