Title: Magnetic spinel ferrite nanoparticles from microemulsions

Authors: Christy R. Vestal, Z. John Zhang

Addresses: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA. ' School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332-0400, USA ' '

Abstract: Microemulsion methods have been used to prepare a wide range of spinel ferrite nanoparticles with low size distribution. Synthesis conditions are summarised for both normal micelle (o/w) and reverse micelle (w/o) synthesis procedures with examples over a variety of ferrite nanoparticles (MFe2O4; M = Co, Fe, Mg, Mn, Cr, Zn). Size selection through control over metal cation concentration and reaction temperature using normal micelle methods as well as through adjusting the water pool diameter in reverse micelle methods is discussed. The ferrite nanoparticles display superparamagnetic properties and the size-dependent magnetization results are consistent with Stoner-Wohlfarth theory for single domain particles. SQUID magnetometry and Mössbauer spectroscopy results are presented.

Keywords: magnetic; nanoparticles; spinel; microemulsion; nanotechnology.

DOI: 10.1504/IJNT.2004.003727

International Journal of Nanotechnology, 2004 Vol.1 No.1/2, pp.240 - 263

Published online: 03 Dec 2003 *

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