Abstract
The magnetic relaxation of magnetic nanoparticles (MNPs) has been used as a potential heating agent for magnetic hyperthermia treatment (MHT). This requires an understanding of the heating mechanism of MNPs, such as Néel relaxation; however, few studies about magnetic relaxation using a low-frequency AC magnetic field have been reported. This study attempts to clarify the correlation between the dominance of Néel relaxation in low-frequency AC fields and the magnetic properties. Nanoparticles of Ni0.8Zn0.2Fe2O4 coated with poly(ethylene glycol) (PEG) were synthesized in various sizes (d = 12, 15, and 19 nm), and were subjected to structural analysis, PEG modification, and magnetic measurements. The PEG400 coating results in a hydrodynamic diameter ten times smaller than that of our previous sample. The heat generation experiment was conducted on samples suspended in solvents of different viscosities in the presence of an AC field (h = 3.2 kAm−1, f = 90 kHz). The specific absorption rate (SAR) as a function of the viscosity of the 15-nm NP sample is consistent with the theoretically calculated value in cases where the Néel relaxation is dominant. Therefore, we conclude that the Néel relaxation dominates the heating mechanism of the 15 nm sample. Rather than being fully superparamagnetic, this sample was partly superparamagnetic and slightly ferromagnetic, with the dominance of the Néel relaxation to a certain degree affected by spin blocking. Detailed analysis of the magnetic relaxation is crucial to improve the heating efficiency of MNPs for MHT.
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Funding
This study was partially supported by Precursory Research for Embryonic Science and Technology at the Japan Science and Technology Agency (JST), JST-Mirai Program No.JPMJMI17D7, Grant-in-Aid for Science Research (No. 17H02762, No. 20H00344) from the Japan Society for the Promotion of Science (JSPS), Program for Strategic Promotion of Bridging Research at the Japan Agency for Medical Research Development (AMED), and the Collaborative Research Project of the Laboratory for Materials and Structures, Institute of Innovative Research, Tokyo Institute of Technology. The authors wish to thank Mr. Kondo and Ms. Kaneda for taking the TEM images of the Ni0.8Zn0.2Fe2O4 NPs.
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Kodama, K., Hamada, S., Nashimoto, K. et al. Nanoarchitectonics of PEG-Coated Ni-Zn Ferrite Nanoparticles and Mechanical Analysis of Heat Generation by Magnetic Relaxation. J Inorg Organomet Polym 32, 3292–3300 (2022). https://doi.org/10.1007/s10904-022-02372-3
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DOI: https://doi.org/10.1007/s10904-022-02372-3