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The structure of bone apatite surfaces.

A S Posner

    Journal of Biomedical Materials Research
    |March 1, 1985
    PubMed
    Summary

    Bone mineral and hydroxyapatite surfaces exhibit strong molecular interactions, crucial for biological functions and applications like chromatography. Their polarizing nature dictates bonding with polar molecules, influencing biological processes.

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    Area of Science:

    • Biomaterials Science
    • Surface Chemistry
    • Biomineralization

    Background:

    • Bone mineral and synthetic hydroxyapatite share similar surface properties.
    • These materials possess high surface areas and reactive sites.

    Purpose of the Study:

    • To review the surface chemistry of bone mineral and hydroxyapatite.
    • To understand the adsorption properties and their implications.

    Main Methods:

    • Small-angle X-ray scattering (SAXS) for surface area determination.
    • Low-temperature nitrogen adsorption for surface characterization.
    • Calorimetric studies of adsorption heats for small molecules.

    Main Results:

    • Bone mineral surfaces range from 100 to 200 m²/g.
    • Surfaces are polarizing, forming strong bonds with polar/polarizable molecules.
    • Water adsorption shows multilayer behavior with decreasing binding energy.

    Conclusions:

    • The high surface reactivity of bone mineral is key to its metabolic interactions.
    • Hydroxyapatite's bonding capacity is utilized in chromatographic applications.
    • Surface chemistry dictates the functional properties of bone mineral and hydroxyapatite.

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