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http://dx.doi.org/10.3740/MRSK.2003.13.9.613

Synthesis and Characterization of SiO2/Fe2O3 Nanocomposite Particles for Hyperthermia  

Yu, Ji-Hun (Department of Materials Technology, Korea Institute of Machinery and Materials)
Lee, Chang-Woo (Division of Materials and Chemical Engineering, Hanyang University)
Lee, Jai-Sung (Division of Materials and Chemical Engineering, Hanyang University)
Choa, Yong-Ho (Department of Advanced Materials Engineering, Hanyang University)
Hofmann, Heinrich (Swiss Federal Institute of Technology at Lausanne(EPFL))
Publication Information
Korean Journal of Materials Research / v.13, no.9, 2003 , pp. 613-618 More about this Journal
Abstract
The magnetic heating effect of $SiO_2$coated $ \Upsilon-Fe_2$$O_3$nanocomposite particle due to magnetic relaxational loss of superparamagnetic regime was investigated by measuring the generated heat from nanocomposite particles in alternative applied magnetic fields. The commercial $ \Upsilon-Fe_2$$O_3$nanoparticles were coated by SiO$_2$in water solution with TEOS and the synthesized nanocomposite powders and its magnetic properties were characterized and compared with the raw$ \Upsilon-Fe_2$$O_3$nanoparticles. The 10∼30 nm sized $ \Upsilon-Fe_2$$O_3$. nanoparticles were coated by 5 nm thickness of amorphous $SiO_2$film. The nanocomposite particle has very low Mr and Hc value showing superparamagnetic behavior The magnetic heating effect of nanocomposite particle on surface coating phase of $SiO_2$was discussed in terms of superparamagnetic behaviors of each particles, and their potential for hyperthermia application was evaluated.
Keywords
namoparticle; hyperthermia; magnetic relaxation loss; superparamagnetism;
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