To quantify the temperature increase induced by superparamagnetic nanocrystals under an oscillating magnetic field, a nano crystalline optical nanothermometer has been developed based on the up-conversion fluorescence spectra of NaYF4:Yb3+, Er3+. Both a nanoheater and nanothermometer are imbedded in a 100 nm mesoporous silica nanoparticle to monitor the nanoparticle temperature change. The magnetically induced heating is examined under different experimental conditions, including the induction power, the exposure time to the magnetic field, and the magnetic nanocrystal size. The nanoparticle temperature demonstrates a more dramatic increase than that of the bulk solution during the oscillating magnetic field exposure, and the temperature evolution after the exposure rapidly equilibrates to that of the bulk surrounding. The method offers new insight into the nano environment temperature change and opens a path for optimizing local temperature for physical and biomedical applications.

Optical temperature detection inside mesoporous silica nanoparticles with superparamagnetic nanoheaters

247th National Meeting (2014)

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