Size-dependent magnetic and inductive heating properties of Fe3O4 nanoparticles: scaling laws across the superparamagnetic size. Issue 18 (27th April 2018)

• Record Type: Journal Article
• Authors: Mohapatra, Jeotikanta; Zeng, Fanhao; Elkins, Kevin; Xing, Meiying; Ghimire, Madhav; Yoon, Sunghyun; Mishra, Sanjay R.; Liu, J. Ping
• Is Part Of: Physical chemistry chemical physics. Volume 20:Issue 18(2018)
• Page Start: 12879
• Page End: 12887
• Publication Date: 2018-04-27
• Subjects: Chemistry, Physical and theoretical -- Periodicals; 541.3
• DOI: 10.1039/c7cp08631h
• Languages: English
• ISSNs: 1463-9076

Abstract

Abstract : An efficient heat activating mediator with an enhanced specific absorption rate (SAR) value is attained via control of the iron oxide (Fe3 O4 ) nanoparticle size from 3 to 32 nm. Abstract : An efficient heat activating mediator with an enhanced specific absorption rate (SAR) value is attained via control of the iron oxide (Fe3 O4 ) nanoparticle size from 3 to 32 nm. Monodispersed Fe3 O4 nanoparticles are synthesized via a seed-less thermolysis technique using oleylamine and oleic acid as the multifunctionalizing agents (surfactant, solvent and reducing agent). The inductive heating properties as a function of particle size reveal a strong increase in the SAR values with increasing particle size up to 28 nm. In particular, the SAR values of ferromagnetic nanoparticles (>16 nm) are strongly enhanced with the increase of ac magnetic field amplitude than that for the superparamagnetic (3–16 nm) nanoparticles. The enhanced SAR values in the ferromagnetic regime are attributed to the synergistic contribution from the hysteresis and susceptibility loss. Specifically, the 28 nm Fe3 O4 nanoparticles exhibit an enhanced SAR value of 801 W g −1 which is nearly an order higher than that of the commercially available nanoparticles.