Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains

A. S. Eggeman; A. K. Petford-Long; P. J. Dobson; J. Wiggins; T. Bromwich; R. Dunin-Borkowski; T. Kasama

doi:10.1016/j.jmmm.2005.07.022

Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains

A. S. Eggeman^*, A. K. Petford-Long, P. J. Dobson, J. Wiggins, T. Bromwich, R. Dunin-Borkowski, T. Kasama

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

24 Scopus citations

Abstract

Nanoparticles of cobalt were produced by direct reduction in aqueous solution. These were subsequently coated in silica by a very slow hydrolysis reaction. Electrostatic and magnetic forces between the nanoparticles led to ordered structures forming, which were analysed by high resolution transmission electron microscopy. SQUID magnetometry showed that the nanoparticles were ferromagnetic with an additional magnetic signal from highly disordered surface states. Off-axis electron holography of the structures was undertaken and gives evidence for the mechanism by which the structures form.

Original language	English (US)
Pages (from-to)	336-342
Number of pages	7
Journal	Journal of Magnetism and Magnetic Materials
Volume	301
Issue number	2
DOIs	https://doi.org/10.1016/j.jmmm.2005.07.022
State	Published - Jun 2006

Keywords

Core shell
Electron holography
Nanoparticles
SQUID magnetometry

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2005.07.022

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title = "Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains",

abstract = "Nanoparticles of cobalt were produced by direct reduction in aqueous solution. These were subsequently coated in silica by a very slow hydrolysis reaction. Electrostatic and magnetic forces between the nanoparticles led to ordered structures forming, which were analysed by high resolution transmission electron microscopy. SQUID magnetometry showed that the nanoparticles were ferromagnetic with an additional magnetic signal from highly disordered surface states. Off-axis electron holography of the structures was undertaken and gives evidence for the mechanism by which the structures form.",

keywords = "Core shell, Electron holography, Nanoparticles, SQUID magnetometry",

author = "Eggeman, {A. S.} and Petford-Long, {A. K.} and Dobson, {P. J.} and J. Wiggins and T. Bromwich and R. Dunin-Borkowski and T. Kasama",

year = "2006",

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T1 - Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains

AU - Eggeman, A. S.

AU - Petford-Long, A. K.

AU - Dobson, P. J.

AU - Wiggins, J.

AU - Bromwich, T.

AU - Dunin-Borkowski, R.

AU - Kasama, T.

PY - 2006/6

Y1 - 2006/6

N2 - Nanoparticles of cobalt were produced by direct reduction in aqueous solution. These were subsequently coated in silica by a very slow hydrolysis reaction. Electrostatic and magnetic forces between the nanoparticles led to ordered structures forming, which were analysed by high resolution transmission electron microscopy. SQUID magnetometry showed that the nanoparticles were ferromagnetic with an additional magnetic signal from highly disordered surface states. Off-axis electron holography of the structures was undertaken and gives evidence for the mechanism by which the structures form.

AB - Nanoparticles of cobalt were produced by direct reduction in aqueous solution. These were subsequently coated in silica by a very slow hydrolysis reaction. Electrostatic and magnetic forces between the nanoparticles led to ordered structures forming, which were analysed by high resolution transmission electron microscopy. SQUID magnetometry showed that the nanoparticles were ferromagnetic with an additional magnetic signal from highly disordered surface states. Off-axis electron holography of the structures was undertaken and gives evidence for the mechanism by which the structures form.

KW - Core shell

KW - Electron holography

KW - Nanoparticles

KW - SQUID magnetometry

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M3 - Article

AN - SCOPUS:33646384618

SN - 0304-8853

VL - 301

SP - 336

EP - 342

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2

ER -

Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains

Abstract

Keywords

ASJC Scopus subject areas

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