1 research outputs found
Modulation of Magnetic Heating via Dipolar Magnetic Interactions in Monodisperse and Crystalline Iron Oxide Nanoparticles
In the pursuit of controlling the
heat exposure mediated by magnetic nanoparticles, we provide new guidelines
for tailoring magnetic relaxation processes via dipolar interactions.
For this purpose, highly crystalline and monodisperse magnetic iron
oxide nanocrystals whose sizes range from 7 to 22 nm were synthesized
by thermal decomposition of iron organic precursors in 1-octadecene.
The as-synthesized nanoparticles are soft nanomagnets, showing superparamagnetic-like
behavior and SAR values which progressively increase with particle
size, field frequency, and amplitude up to 3.6 kW/g<sub>Fe</sub>.
Our data show the influence of media viscosity, particle size, and
concentration on dipolar interactions and consequently on the magnetic
relaxation processes related to the heat release. Understanding the
role of dipolar interactions is of great importance toward the use
of iron oxide nanoparticles as efficient hyperthermia mediators