NDLI: Magnetic properties of biosynthesized magnetite nanoparticles

Content Provider	IEEE Xplore Digital Library
Author	Yeary, L.W. Ji-Won Moon Love, L.J. Thompson, J.R. Rawn, C.J. Phelps, T.J.
Copyright Year	1965
Abstract	Magnetic nanoparticles, which are unique because of both structural and functional elements, have various novel applications. The popularity and practicality of nanoparticle materials create a need for a synthesis method that produces quality particles in sizable quantities. This paper describes such a method, one that uses bacterial synthesis to create nanoparticles of magnetite. The thermophilic bacterial strain Thermoanaerobacter ethanolicus TOR-39 was incubated under anaerobic conditions at 65/spl deg/C for two weeks in aqueous solution containing Fe ions from a magnetite precursor (akaganeite). Magnetite particles formed outside of bacterial cells. We verified particle size and morphology by using dynamic light scattering, X-ray diffraction, and transmission electron microscopy. Average crystallite size was 45 nm. We characterized the magnetic properties by using a superconducting quantum interference device magnetometer; a saturation magnetization of 77 emu/g was observed at 5 K. These results are comparable to those for chemically synthesized magnetite nanoparticles.
Sponsorship	IEEE Magnetics Society
Starting Page	4384
Ending Page	4389
Page Count	6
File Size	461590
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	12
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-12-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic properties Nanoparticles Saturation magnetization Superconducting magnets Microorganisms Biological materials Magnetic materials Magnetic field induced strain Iron Morphology nanotechnology Biological cells biomagnetics magnetic materials magnetite
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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