Heat Generation in Single Magnetic Nanoparticles under Near-Infrared Irradiation
2020
Heat
generation by pointlike structures is an appealing concept
for its implications in nanotechnology and biomedicine. The way to
pump energy that excites heat locally and the synthesis of nanostructures
that absorb such energy are key issues in this endeavor. High-frequency
alternating magnetic or near-infrared optical fields are used to induce
heat in iron oxide nanoparticles, a combined solution that is being
exploited in hyperthermia treatments. However, the temperature determination
around a single iron oxide nanoparticle remains a challenge. We study the heat released from iron oxide
nanostructures under near-infrared illumination on a one-by-one basis
by optical tweezers. To measure the temperature, we follow the medium
viscosity changes around the trapped particle as a function of the
illuminating power, thus avoiding the use of thermal probes. Our results
help interpret temperature, a statistical parameter, in the nanoscale
and the concept of heat production by nanoparticles under thermal
agitation.
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