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    Hydrophilicity of Nonanoic Acid and Its Conjugate Base at the Air/Water Interface

    Access Status
    Fulltext not available
    Authors
    Badban, S.
    Hyde, A.
    Phan, Chi
    Date
    2017
    Type
    Journal Article
    
    Metadata
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    Citation
    Badban, S. and Hyde, A. and Phan, C. 2017. Hydrophilicity of Nonanoic Acid and Its Conjugate Base at the Air/Water Interface. ACS Omega. 2 (9): pp. 5565-5573.
    Source Title
    ACS Omega
    DOI
    10.1021/acsomega.7b00960
    ISSN
    2470-1343
    School
    WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
    URI
    http://hdl.handle.net/20.500.11937/74226
    Collection
    • Curtin Research Publications
    Abstract

    A general adsorption model based on partial dissociation was developed for carboxylic acids. The model was applied to the adsorption of nonanoic acid at the air/water interface. Two cases were selected for experimental verification: acid-only and acid with a constant Na+OH– concentration. The model was applied simultaneously at both conditions, and the hydrophilicity of the ionic states was quantified by the adsorption constants, KA and KAH. It was found that the adsorption constant for the acidic group is significantly higher than that for the carboxylate group, KAH/KA ∼ 272. The model lays important groundwork for modeling and predicting carboxylic/carboxylate adsorption.

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