Heatable magnetic nanocomposites with Fe3O4 nanocubes

Date

2022-09-27

Authors

Lecumberri, Cristina
Monteserín, María
Fernández, Lorea
Medrano Fernández, Ángel María

Director

Publisher

Elsevier
Acceso abierto / Sarbide irekia
Artículo / Artikulua
Versión publicada / Argitaratu den bertsioa

Project identifier

  • AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/RTI2018-096262-B-C41/ES/ recolecta
Impacto
OpenAlexGoogle Scholar
No disponible en Scopus

Abstract

The development of magnetic self-heating polymers is an area of great interest for many applications. The intrinsic magnetic properties of the magnetic fillers play a key role in the final heating capability of these nanocomposites. Thus, it has been already reported the improvement of the heating efficiency on Fe3O4 magnetic nanocubes with respect to spherical nanoparticles with the similar mean size1. This result is due to the contribution of the magnetic anisotropy giving rise to higher magnetic coercivity and as consequence, higher SAR (Specific Absorption Rate) values. In this work, well- defined Fe3O4 nanocubes were synthesized through thermal decomposition processes with a mean particle diameter around 70 nm (TEM) (Fig. 1). The SAR values were estimated through the measurement of the AC hysteresis loops, obtaining values of around 900 W/g for the dispersion of the nanocubes in water and values of 350 W/g for the nanocubes dispersed in agar (0.5% wt), with a frequency of 403 kHz and a field amplitude of 30kA/m . In this case, the decrease of the SAR values is due to the inmovilization of the particles in the medium and hence, the Brownian movement of the particles. The temperature increase was also characterized, where a clear enhancement of the heating properties was obtained for nanocubes comparing with spherical nanoparticles of similar mean diameter (Fig. 2). Finally, the heating capacity of the nanocomposites (30% weight of magnetic nanoparticles) was studied through the application of an external AC magnetic field with a Helmholtz coil (319 kHz, 400A, 200G approximately, induction equipment model EasyHeat Ambrell). The effect of the thickness of the polymeric discs on the final temperature achieved was studied (2 and 4 mm thickness and 30 mm diameter). Thus, temperatures of 100 °C or 250 °C were reached after 2 min for the nanocomposites with thicknesses of 2 and 4 mm respectively.

Description

Keywords

Heating efficiency, Magnetic nanoparticles, SAR, Self-healing polymers

Department

Ciencias / Zientziak / Institute for Advanced Materials and Mathematics - INAMAT2

Faculty/School

Degree

Doctorate program

item.page.cita

Larumbe, S., Lecumberri, C., Monteserín, M., Fernández, L., Medrano, Á., Martín, F., Gómez-Polo, C., Garaio, E. (2022). Heatable magnetic nanocomposites with Fe3O4 nanocubes. Science Talks, 4, 1-2. https://doi.org/10.1016/j.sctalk.2022.100077.

item.page.rights

© 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.

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