# Dynamics of self-reorganization explains passivation of silicate glasses

* Corresponding author
2 LCLT - Laboratoire d'Etudes du Comportement à Long Terme des matériaux de conditionnement
DE2D - Département de recherche sur les technologies pour l'enrichissement, le démantèlement et les déchets : DEN/DE2D
Abstract : Understanding the dissolution of silicate glasses and minerals from atomic to macroscopic levels is a challenge with major implications in geoscience and industry. One of the main uncertainties limiting the development of predictive models lies in the formation of an amorphous surface layer–called gel–that can in some circumstances control the reactivity of the buried interface. Here, we report experimental and simulation results deciphering the mechanisms by which the gel becomes passivating. The study conducted on a six-oxide borosilicate glass shows that gel reorganization involving high exchange rate of oxygen and low exchange rate of silicon is the key mechanism accounting for extremely low apparent water diffusivity (∼10$^{−21} m^2 s^{−1}$), which could be rate-limiting for the overall reaction. These findings could be used to improve kinetic models, and inspire the development of new molecular sieve materials with tailored properties as well as highly durable glass for application in extreme environments.
Document type :
Journal articles
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https://hal-cea.archives-ouvertes.fr/cea-01877346
Contributor : Bruno Savelli <>
Submitted on : Monday, February 1, 2021 - 3:30:26 PM
Last modification on : Friday, March 5, 2021 - 12:10:03 PM

### File

Gin1.pdf
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### Citation

S. Gin, Marie Collin, Patrick Jollivet, Maxime Fournier, Yves Minet, et al.. Dynamics of self-reorganization explains passivation of silicate glasses. Nature Communications, Nature Publishing Group, 2018, 9, pp.2169. ⟨10.1038/s41467-018-04511-2⟩. ⟨cea-01877346⟩

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