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Related Experiment Videos

Carbonate formation on bioactive glasses.

Marta Cerruti1, Claudio Morterra

  • 1Department of Chemistry I.F.M., University of Turin, Consortium INSTM, Research Unit of Turin University, via P. Giuria 7, 10125 Torino, Italy.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 14, 2004
PubMed
Summary

Bioactive glass 58S carbonation requires both carbon dioxide and excess water, unlike pure calcium oxide. Water facilitates carbonate formation by creating a liquid-like layer and promoting calcium migration, crucial for bone prosthetic applications.

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Area of Science:

  • Biomaterials Science
  • Materials Chemistry
  • Surface Chemistry

Background:

  • Bioactive glass 58S (SiO2-CaO-P2O5) is a sol-gel synthesized material used as a bone prosthetic.
  • Its bioactivity stems from the formation of a hydroxycarbonate apatite layer in physiological fluids.
  • Understanding the carbonation mechanism is key to optimizing its performance and stability.

Purpose of the Study:

  • To elucidate the mechanism of bioactive glass 58S carbonation.
  • To identify the specific roles of CO2 and H2O in the carbonation process.
  • To compare carbonation mechanisms in bioactive glass 58S, Ca-doped silica, and CaO.

Main Methods:

  • In-situ FTIR spectroscopy under vacuum conditions.
  • Use of CO2, H2O, and CD3CN as probe molecules.

Related Experiment Videos

  • Comparative study with Ca-doped silica and CaO.

    • Main Results:

    • Carbonation of 58S and Ca-doped silica requires both CO2 and excess H2O, unlike CaO where CO2 alone forms ionic carbonates.
    • H2O acts as a Lewis base, blocking cationic sites, and forms a liquid-like layer for carbonate ion formation.
    • H2O also promotes Ca2+ migration from the bulk to the surface of the glass.
    • Identical carbonate types form on CaO and Ca-bearing silicas, but via different mechanisms.

    Conclusions:

    • Excess water is essential for significant carbonation of bioactive glasses.
    • The studied mechanism simulates in-situ carbonation in physiological fluids and during shelf-aging.
    • This research provides insights into the surface chemistry of bioactive glasses relevant to bone regeneration.