NDLI: Mossbauer studies of nano-size controlled iron oxide for biomedical applications

Content Provider	IEEE Xplore Digital Library
Author	Sang Won Lee Sam Jin Kirm In-Bo Shim Chul Sung Kim
Copyright Year	2005
Description	Author affiliation: Dept. of Phys., Kookmin Univ., Seoul, South Korea (Sang Won Lee; Sam Jin Kirm; In-Bo Shim; Chul Sung Kim)
Abstract	Synthesis of iron oxide nanoparticles and correct characterizations by Mossbauer spectroscopy and transmission electron microscope (TEM) are reported. Mossbauer studies are essential tool because the only X-ray diffractometer (XRD) patterns in nanoparticles could not distinguish iron oxides from magnetite, maghemite, and spinel oxides because of similar crystal structure. MFe/sub 2/O/sub 4/ (M = Fe, Co) with spinel structure are made by reaction of iron(III) acetylacetonate [Fe(acac)/sub 3/] with surfactants at high temperature. We have used the phenyl ether, benzyl ether, and 1,2-hexadecanediol as solvents. Fe(acac)/sub 3/ was mixed in phenyl ether and benzyl ether for synthesis of the magnetite (Fe/sub 3/O/sub 4/). As boiling point of phenyl ether (259 /spl deg/C) is lower than that of benzyl ether (298 /spl deg/C), the size of magnetite nanoparticles can be controlled. And then, iron oxide nanoparticles have been coated by tetraethyl orthosilicate (TEOS) mixed ethyl alcohol and NH/sub 4/OH. The average particle sizes of iron oxides were 6, 13, and 18 nm, narrow size distribution was convinced by TEM. The Mossbauer spectrum for the 6 nm sample at room temperature displays a superparamagnetic behavior as demonstrated by the single quadrupole doublet with zero hyperfine fields. While 13 and 18 nm particle show partially superparamagnetic behavior at room temperature. It is concluded that 13 nm and 18 nm samples are maghemite and magnetite, respectively, from the Mossbauer spectra. It is suggested that 6 nm samples are available for biomedical applications such as hyperthermia and drug delivery system as a magnetic fluid carrier.
Sponsorship	Magnetics Soc. of Japan Magnetics Soc. of the IEEE
Starting Page	459
Ending Page	460
File Size	192344
Page Count	2
File Format	PDF
ISBN	0780390091
DOI	10.1109/INTMAG.2005.1463658
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-04-04
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Iron Nanoparticles Temperature Spectroscopy Transmission electron microscopy X-ray diffraction X-ray scattering Solvents Size control Displays
Content Type	Text
Resource Type	Article

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