NDLI: Mo/spl uml/ssbauer studies of nano-size controlled iron oxide for biomedical applications

Content Provider	IEEE Xplore Digital Library
Author	Sang Won Lee Kim, S.J. In-Bo Shim Seongtae Bae Chul Sung Kim
Copyright Year	1965
Abstract	We present the magnetic properties and the material characteristics of magnetite (Fe/sub 3/O/sub 4/), which was successfully prepared by using the reaction of iron(III) acetylacetonate [Fe(acac)/sub 3/] with surfactants at high temperature (so called by "high temperature decomposition method"). According to the results of high resolution transmission electron microscopy (HRTEM) analysis, the prepared iron oxide particles had the average particle sizes between 4 and 6 nm and very uniform size distributions. The crystal structure analyzed by using both XRD and Mo/spl uml/ssbauer spectra confirmed that the prepared iron oxide nanoparticles only have single magnetite (Fe/sub 3/O/sub 4/) crystal phase. The typical superparamagnetic behaviors were observed from the prepared iron-oxide nanoparticles. In addition, they showed the saturation magnetization, M/sub S/ of 59.5 emu/g for 4 nm, and of 59.7 emu/g for 6 nm, respectively at room temperature under the externally applied magnetic field of 10 kOe. The measured Mo/spl uml/ssbauer spectrum at 4.2 K was fitted using two magnetic components: (1) hyperfine fields H/sub hf/=514 and 492 kOe, (2) isomer shifts /spl delta/=0.35 and 0.73 mm/s. The fitted data apparently verified that the prepared iron oxide samples only have pure magnetite ([Fe/sup 3+/]/sub A/ [Fe/sup 2+/Fe/sup 3+/]/sub B/O/sub 4/).
Sponsorship	IEEE Magnetics Society
Starting Page	4114
Ending Page	4116
Page Count	3
File Size	582924
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Iron Saturation magnetization Temperature Magnetic materials Magnetic analysis Nanoparticles Magnetic field measurement Magnetic properties Biological materials Biomedical materials superparamagnetism Bio-medical applications magnetite MÖssbauer spectroscopy nanoparticles
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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