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Decrease in the solubility product of hydroxyapatite by the adsorption of surface-active ion.

S Shimabayashi, H Tanaka, M Nakagaki

    Chemical & Pharmaceutical Bulletin
    |September 1, 1989
    PubMed
    Summary

    The solubility product of hydroxyapatite decreased with ionic surfactant adsorption, indicating surface changes. Nonionic surfactants had minimal impact on hydroxyapatite solubility.

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    Area of Science:

    • Materials Science
    • Surface Chemistry
    • Physical Chemistry

    Background:

    • Hydroxyapatite (HAP) is a key biomaterial, and its solubility is critical for applications.
    • Surfactants are widely used in material processing and can alter surface properties.
    • Understanding HAP-surfactant interactions is essential for controlling HAP behavior in solutions.

    Purpose of the Study:

    • To investigate the effect of ionic and nonionic surfactants on the solubility product (Ksp) of hydroxyapatite.
    • To elucidate the mechanisms behind the observed changes in HAP solubility.

    Main Methods:

    • Solubility product measurements of hydroxyapatite in solutions containing varying concentrations of ionic surfactants (dodecylammonium and dodecyl sulfate ions).
    • Similar measurements were conducted in the presence of a nonionic surfactant (polyoxyethylene(10) octylphenyl ether).

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  • Analysis of the adsorption behavior of surfactant ions on the hydroxyapatite surface.

    • Main Results:

    • A decrease in the solubility product (Ksp) of hydroxyapatite was observed with increasing adsorption of ionic surfactants.
    • The Ksp of hydroxyapatite remained relatively constant in the presence of the nonionic surfactant.
    • Evidence suggests ion-exchange and surface complex formation between HAP and ionic surfactants.

    Conclusions:

    • Adsorption of ionic surfactants significantly reduces hydroxyapatite solubility by altering its chemical potential.
    • Surface complex formation via ion-exchange plays a crucial role in modifying HAP surface properties and solubility.
    • Nonionic surfactants exhibit a negligible effect on hydroxyapatite solubility under the tested conditions.