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Magnetic Properties, Self-Temperature Rising Characteristics, and Biocompatibility of NiFe _2 O _4 Nanoparticles for Hyperthermia Applications

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7 Author(s)
Sang Won Lee ; Dept. of Electr. & Comput. Eng., Nat. Univ. of Singapore ; Bae, Seongtae ; Takemura, Y. ; Yamashita, E.
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This paper reports first on the very promising self-heating and temperature rising characteristics of solid-state NiFe2O4 nanoparticles for hyperthermia applications. NiFe2O4 nanoparticles were prepared by using both the "high temperature thermal decomposition method (HTTD)" and the "newly modified sol-gel" methods. The magnetic properties and cell-cytotoxic properties of the synthesized NiFe2O4 nanoparticles were investigated to consider these nanoparticles for in vivo hyperthermia applications. The saturation magnetic moments measured by a high sensitive SQUID were between 43.0 and 47.6 emu/g. The cell survival rates of NiFe2O4 and chitosan coated NiFe2O4, which were determined by MTT assay, around 85 % and 98.8 %, respectively. The maximum self-heating temperature induced by our specially designed RF-MRI modified L-C circuit was 47.3degC and the frequency and magnetic field product, H 0f was 1.07 times 109 Am-1 s-1

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Magnetics, IEEE Transactions on  (Volume:42 ,  Issue: 10 )