The effect of boundary conditions on gas phase synthesised silver nanoparticles

Ulrika Backman, Jorma K. Jokiniemi, Ari Auvinen, Kari Lehtinen

    Research output: Contribution to journalArticleScientificpeer-review

    39 Citations (Scopus)


    We have prepared spherical non-agglomerated silver nanoparticles by an evaporation-condensation-dilution/cooling technique. Silver was evaporated from a crucible in a tubular flow reactor. A porous tube diluter was used to quench the carrier gas at the outlet of the reactor to enhance the formation of small particles and to suppress agglomeration and other particle growth mechanisms. The number size distribution of the prepared particles was measured with a DMA-CNC combination and the size and the shape of the particles were analysed with TEM. The system was modelled using a sectional aerosol dynamics computer code (ABC) to estimate the importance of different aerosol processes. In all conditions the particles obtained were non-agglomerated and spherical. The mean particle diameter varied from 4 to 10 nm depending on boundary conditions. From the modelling studies it can be concluded that the nucleation rate is the most important parameter controlling the final particle size.
    Original languageEnglish
    Pages (from-to)325-335
    JournalJournal of Nanoparticle Research
    Issue number4
    Publication statusPublished - 2002
    MoE publication typeA1 Journal article-refereed


    • silver
    • nanoparticles
    • aerosol synthesis
    • modelling


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