The size and morphology of the synthesized nanoparticles were evaluated using FEI Tecnai™ Spirit Transition Electron Microscope equipped with an Eagle™ 2K CCD multiscan camera (FEI, Hillsboro, OR, USA).[89 (link)] Chemical composition of the nanoparticles was analyzed by energy-dispersive X-ray spectroscopy (EDX) using an FEI 80–300 kV Titan Analytical Transmission Electron Microscope (FEI, Hillsboro, OR, USA). The heating efficiency of hexagonal and spherical nanoparticles under AMF was measured and compared in terms of specific absorption rate (SAR) by using the equation below in accordance with the previously published procedure.[19 ,20 (link)]
where C is the specific heat capacity of the medium, Vs is the sample volume, m is the mass of magnetic nanoparticle suspended in the medium, and dT/dt is the initial slope of the time-dependent temperature curve.
Vials containing tested nanoparticles in THF (1 mg mL−1 Fe) were thermally insulated and placed in a water-cooled 6-turn copper coil (4 cm inner diameter). Each vial was then subjected to AMF (420 kHz, 26.9 kA m−1) produced by an induction heating system (MSI Automation, Wichita, KS, USA) and the temperature was recorded with a probe (Neoptix Inc., QC, Canada) as previously reported.[20 (link),90 (link)] The obtained data were used to generate time-dependent temperature curves.
where C is the specific heat capacity of the medium, Vs is the sample volume, m is the mass of magnetic nanoparticle suspended in the medium, and dT/dt is the initial slope of the time-dependent temperature curve.
Vials containing tested nanoparticles in THF (1 mg mL−1 Fe) were thermally insulated and placed in a water-cooled 6-turn copper coil (4 cm inner diameter). Each vial was then subjected to AMF (420 kHz, 26.9 kA m−1) produced by an induction heating system (MSI Automation, Wichita, KS, USA) and the temperature was recorded with a probe (Neoptix Inc., QC, Canada) as previously reported.[20 (link),90 (link)] The obtained data were used to generate time-dependent temperature curves.
