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Encapsulation of Magnetic Particles in Metallic Hollow Nanospheres

Published online by Cambridge University Press:  17 March 2011

M. Toprak ,
D. K. Kim ,
M. Mikhailova ,
Y. Zhang ,
Y. K. Jeong  and
M. Muhammed
M. Toprak
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
D. K. Kim
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
M. Mikhailova
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Y. Zhang
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Y. K. Jeong
Affiliation:
KICET (Korea Institute of Ceramic Engineering and Technology) 233-5, Gasan-Dong, Geumcheon-Gu, Seoul 153-801, Korea
M. Muhammed
Affiliation:
Materials Chemistry Division, Royal Institute of Technology, SE-100 44 Stockholm, Sweden
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Abstract

Novel metallic capsules containing magnetite with given size in the sub-micron range have been produced. These nanocapsules are prepared in several steps through a colloidal templating approach. The first step is the synthesis of size-selected SiO2 nanospheres. The second step is coating the SiO2nanospheres by electroless deposition with gold, in order to form a porous gold shell around the silica. Electroless deposition is controlled by the concentration of gold in the coating solution. Subsequently, the core (SiO2) was removed to obtain gold capsules. The final step is the inclusion of magnetite nanoparticles inside these nanocapsules and recoating the capsules with gold in order to have continuous encapsulation. The nanocapsule and core-shell structure have been characterized by TEM and DSC

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 704: Symposium W – Nanoparticulate Materials , 2001 , W6.29.1
Copyright
Copyright © Materials Research Society 2002

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