Learning from Nature to Improve the Heat Generation of Iron-Oxide Nanoparticles for Magnetic Hyperthermia Applications

TL;DR

This study combines experimental and theoretical approaches to enhance magnetic hyperthermia using cubic iron oxide nanoparticles with higher anisotropy, demonstrating improved heat generation for cancer treatment.

Contribution

It introduces a novel analysis showing that cubic nanoparticles outperform spherical ones in heating efficiency due to increased surface anisotropy, supported by Monte Carlo simulations.

Findings

Cubic iron oxide nanoparticles have superior heating efficiency.

Surface anisotropy enhances magnetic hyperthermia performance.

Particle interactions influence overall heating properties.

Abstract

The performance of magnetic nanoparticles is intimately entwined with their structure, mean size and magnetic anisotropy. Besides, ensembles offer a unique way of engineering the magnetic response by modifying the strength of the dipolar interactions between particles. Here we report on an experimental and theoretical analysis of magnetic hyperthermia, a rapidly developing technique in medical research and oncology. Experimentally, we demonstrate that single-domain cubic iron oxide particles resembling bacterial magnetosomes have superior magnetic heating efficiency compared to spherical particles of similar sizes. Monte Carlo simulations at the atomic level corroborate the larger anisotropy of the cubic particles in comparison with the spherical ones, thus evidencing the beneficial role of surface anisotropy in the improved heating power. Moreover we establish a quantitative link between the particle assembling, the interactions and the heating properties. This knowledge opens new perspectives for improved hyperthermia, an alternative to conventional cancer therapies.