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Size-dependent magnetic and inductive heating properties of Fe3O4 nanoparticles: Scaling laws across the superparamagnetic size

Abstract

An efficient heat activating mediator with an enhanced specific absorption rate (SAR) value is attained via control of the iron oxide (Fe3O4) nanoparticle size from 3 to 32 nm. The monodispersed Fe3O4 nanoparticles are synthesized via a seed-less energy efficient thermolysis technique using oleylamine and oleic acid as the multifunctionalizing agent (surfactants, solvent and reducing agent). The inductive heating properties as a function of particle size revealed a strong increase in the SAR values with increasing particle size till 28 nm that is above the superparamagnetic size. Particularly, the SAR values of ferromagnetic nanoparticles (> 16 nm) are enhanced strongly with the increase of ac magnetic field amplitude than that for the superparamagnetic (3-16 nm) nanoparticles. The enhanced SAR values in ferromagnetic regime are attributed to the synergistic contribution from the hysteresis and susceptibility loss. Specifically, the 28 nm Fe3O4 nanoparticles exhibit an enhanced SAR value of 801 W/g which is nearly an order higher than that of the commercially available nanoparticles.

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Publication details

The article was received on 26 Dec 2017, accepted on 06 Apr 2018 and first published on 06 Apr 2018


Article type: Paper
DOI: 10.1039/C7CP08631H
Citation: Phys. Chem. Chem. Phys., 2018, Accepted Manuscript
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    Size-dependent magnetic and inductive heating properties of Fe3O4 nanoparticles: Scaling laws across the superparamagnetic size

    J. Mohapatra, F. Zeng, K. Elkins, M. Xing, M. Ghimire, S. Yoon, S. R. Mishra and J. P. Liu, Phys. Chem. Chem. Phys., 2018, Accepted Manuscript , DOI: 10.1039/C7CP08631H

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