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    Role of Capping Agent in Wet Synthesis of Nanoparticles

    Access Status
    Fulltext not available
    Authors
    Phan, Chi
    Nguyen, H.
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Phan, C. and Nguyen, H. 2017. Role of Capping Agent in Wet Synthesis of Nanoparticles. Journal of Physical Chemistry A. 121 (17): pp. 3213-3219.
    Source Title
    Journal of Physical Chemistry A
    DOI
    10.1021/acs.jpca.7b02186
    ISSN
    1089-5639
    School
    Department of Chemical Engineering
    URI
    http://hdl.handle.net/20.500.11937/58419
    Collection
    • Curtin Research Publications
    Abstract

    © 2017 American Chemical Society. Aqueous-based synthesis is one of the most popular methods to prepare nanoparticles. In these procedures, surfactants are needed to regulate the growth and final particle size. While there are numerous evidence on the decisive role of surfactants, a quantitative description remains elusive. This study develops a theoretical model to correlate the surfactant activities to particle growth. In the model, the "penetrability" of ions within surfactant layer is used to combine surface reaction and adsorption/desorption processes. The penetrability was then directly correlated to surfactant size. The theory was verified by synthesis of iron oxide nanoparticles with series of cationic surfactants. Eight surfactants, with same headgroup and increasing hydrocarbon tail, were employed. The experimental data showed a deterministic correlation between surfactant tails and particle size. The experimental correlation between surfactant length and particle size was predicted by the model. The modeling results verify the role of surfactant as capping agent during particle growth. More importantly, it provides a theoretical framework to control particle size in wet synthesis.

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