Synthesis of cobalt nanoparticles to enhance magnetic permeability of metal-polymer composites

Pirjo Koskela (Corresponding Author), Merja Teirikangas, Ari Alastalo, Johanna Forsman, Jari Juuti, Unto Tapper, Ari Auvinen, Heikki Seppä, Heli Jantunen, Jorma Jokiniemi

    Research output: Contribution to journalArticleScientificpeer-review

    12 Citations (Scopus)


    Metallic cobalt nanoparticles were synthesized by hydrogen reduction method. Particles were coated in situ with carbon by adding ethene to reaction flow. Particles were characterized by transmission electron microscopy, energy dispersive X-ray emission, X-ray diffraction, X-ray fluorescence and BET method. The observed cobalt particle size distributions in different cobalt batches produced with unvarying reaction parameters was reproducible: The mean diameter of primary cobalt particle varied only 5% from the mean value of 76 nm in different batches. Increased carbon precursor concentration decreased mean diameter of cobalt particles to 17 nm. The produced nanoparticles were used as filler material in 0–3 type metal–polymer composites. Composite samples with varying filler loading were fabricated with mixing extrusion and injection moulding techniques. The magnetic properties of the fabricated composites were measured up to 1 GHz. In order to analyse the particle distribution in composite matrix and its effect on magnetic properties the microstructure was studied.
    Original languageEnglish
    Pages (from-to)649-656
    JournalAdvanced Powder Technology
    Issue number5
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed


    • Magnetic nanoparticles
    • cobalt
    • polymer-matrix composite (PMC)
    • magnetic properties
    • modelling


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