Efficient Brownian oscillators and nanoheaters based on gallium-doped e-Fe2O3

Published January 21, 2021 | Version v1

Journal article Open

1. Instituto de Ciencia de Materiales de Aragón, ICMA-CSIC/University of Zaragoza, C/Pedro Cerbuna 10, Zaragoza 50006, Spain
2. Departamento de Física and CICECO, Universidade de Aveiro, Aveiro 3810-193, Portugal
3. Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
4. Instituto de Ciencia de Materiales de Arago´n, ICMA-CSIC/University of Zaragoza, C/Pedro Cerbuna 10, Zaragoza 50006, Spain
5. School of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, P. R. China
6. Departamento de Electrónica de Potencia, I3A. Universidad de Zaragoza, 50018 Zaragoza, Spain

Here we show that Gallium-Substituted -Fe2O3 nanoparticles are easily stabilized in

aqueous media having at the same time small interparticle magnetic interactions and huge

coupling with the lattice such that torques at the nanoscale can be efficiently applied.

Moreover, under ac magnetic fields of 0<f<1000 Hz this torque is applied without heat

losses while the region f=10-120 kHz can be explored to dissipate heat.

It is shown that the specific power of Gallium-Substituted -Fe2O3 nanoparticles is larger

than those of γ-Iron Oxide nanoparticles currently used in magnetic hyperthermia.

In this view, Gallium-Substituted -Fe2O3 nanoparticles are expected to be useful tools to

efficiently apply mechanical forces to induce cellular apoptosis and to discern between

mechanical and thermal contributions to cellular apoptosis currently under debate.

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