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Time resolved alteration process of oxide glasses.

Luc Girard1, Mehdi Arab, Olivier Spalla

  • 1Laboratoire Interdisciplinaire sur l'Organisation Nanométrique et Supramoléculaire CEA/DRECAM CEA Saclay, 91191 Gif sur Yvette, France. luc.girard@cea.fr

Journal of Colloid and Interface Science
|December 18, 2007
PubMed
Summary

This study reveals that zirconium in oxide glasses creates porous surface layers when exposed to water. Higher zirconium content initially increases pore volume and surface exchange, then stabilizes as the glass alters.

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Area of Science:

  • Materials Science
  • Geochemistry
  • Physical Chemistry

Background:

  • Water-glass interactions are crucial for understanding material durability and environmental fate.
  • The surface alteration layer significantly influences the long-term behavior of glasses.

Purpose of the Study:

  • To investigate the effect of zirconium content on the dissolution kinetics and altered layer structure of sodium borosilicate glasses.
  • To elucidate the role of insoluble elements in glass-water interactions.

Main Methods:

  • Small-angle X-ray scattering (SAXS) was employed to analyze the nanostructure of the altered surface layer.
  • Dissolution experiments were conducted on oxide glasses with varying zirconium (Zr) concentrations.

Main Results:

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  • The altered surface layer is characterized by nanometer-sized pores, indicating a porous structure.
  • Zirconium content significantly impacts alteration kinetics and the structure of the altered layer.
  • Above 2% Zr, an initial overshoot in Si leaching and porous volume occurs, followed by stabilization.

Conclusions:

  • Zirconium influences the formation and structure of the porous alteration layer in oxide glasses.
  • The interplay between dissolution, recondensation, and insoluble element content governs glass durability.
  • Understanding these mechanisms is vital for predicting glass performance in aqueous environments.