Effects of shell thickness on blocking temperature of nanocomposites of metal particles with gold shells

Nanoscale iron particles were synthesized in reverse micelles created from aqueous reactants, octane, n-butanol, and cetyltrimethylammonium bromide (CTAB). Using reverse micelles as nano-reactors allows for the sequential synthesis of core-shell nanoparticles. Iron nanoparticles were synthesized and...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1999-09, Vol.35 (5), p.3496-3498
Main Authors: Carpenter, E.E., Sangregorio, C., O'Connor, C.J.
Format: Article
Language:English
Subjects:
Amorphous and nanocrystalline magnetic materials
quasicrystals
Amorphous and quasicrystalline magnetic materials
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Gold
Iron
Magnetic cores
Magnetic properties
Magnetic properties and materials
Magnetic susceptibility
Magnetic variables measurement
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Physics
Reverse micelles
Shells
SQUIDs
Studies of specific magnetic materials
Temperature
X-ray scattering
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Summary:Nanoscale iron particles were synthesized in reverse micelles created from aqueous reactants, octane, n-butanol, and cetyltrimethylammonium bromide (CTAB). Using reverse micelles as nano-reactors allows for the sequential synthesis of core-shell nanoparticles. Iron nanoparticles were synthesized and coated with gold. A series of particles with varying gold shell thickness were synthesized to investigate the effect of shell thickness on the magnetic properties of the iron core. Particle sizes were confirmed using XRD and particle uniformity was determined by TEM. Magnetic measurement carried out using a SQUID susceptometer indicated superparamagnetic behavior.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.800568