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

    Research output: Contribution to journalArticlepeer-review

    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 languageEnglish
    Pages (from-to)336-342
    Number of pages7
    JournalJournal of Magnetism and Magnetic Materials
    Volume301
    Issue number2
    DOIs
    Publication statusPublished - Jun 2006

    Keywords

    • Core shell
    • Electron holography
    • Nanoparticles
    • SQUID magnetometry

    Fingerprint

    Dive into the research topics of 'Synthesis and characterisation of silica encapsulated cobalt nanoparticles and nanoparticle chains'. Together they form a unique fingerprint.

    Cite this