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

Yuanyu Gu; Nuno J. O. Silva; Marie Yoshikiyo; Asuka Namai; Rafael Piñol; Guillaume Maurin-Pasturel; Yuwen Cui; Shin-ichi Ohkoshi; Angel Millán; Abelardo Martínez

doi:10.1039/D0CC07309A

Efficient Brownian oscillators and nanoheaters based on gallium-doped ε-Fe₂O₃†

Yuanyu Gu,^ab Nuno J. O. Silva,

^c Marie Yoshikiyo,

^d Asuka Namai,

^d Rafael Piñol,^b Guillaume Maurin-Pasturel,

^b Yuwen Cui,*^a Shin-ichi Ohkoshi,

*^d Angel Millán

*^b and Abelardo Martínez^e

Author affiliations

* Corresponding authors

^a School of Materials Science and Engineering, Nanjing Tech University, Nanjing, P. R. China

^b Instituto de Ciencia de Materiales de Aragón, ICMA-CSIC/University of Zaragoza, C/Pedro Cerbuna 10, Zaragoza 50006, Spain
E-mail: amillan@unizar.es

^c Departamento de Física and CICECO, Universidade de Aveiro, Aveiro 3810-193, Portugal

^d Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
E-mail: ohkoshi@chem.s.u-tokyo.ac.jp

^e Departamento de Electrónica de Potencia, I3A. Universidad de Zaragoza, 50018 Zaragoza, Spain

Abstract

Wireless actuation at the nanoscale is vital in many contexts, and magnetic fields acting on nanoparticles (NPs) are among the most effective tools when actuation concerns linear forces. However, effective tools to apply torques at the nanoscale are still missing, because NPs where the magnetic moment is strongly coupled to the lattice agglomerate due to their high magnetic moment. Here, we show that gallium-doped ε-iron oxide NPs have small interparticle magnetic interactions and huge lattice-coupling for efficiently applying torques at the nanoscale. In this view, they 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.

Chemical Communications

Efficient Brownian oscillators and nanoheaters based on gallium-doped ε-Fe₂O₃†

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

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