Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties
Abstract Physical and chemical properties of passivating alteration gels formed on alumino-boro-silicate glasses of interest for nuclear waste containment are reported. Opposite effects of B and Al on the gel’s propensity to restructure and become passivating were observed. Boron, primarily forming...
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| Format: | Article |
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Nature Portfolio
2025-05-01
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| Series: | npj Materials Degradation |
| Online Access: | https://doi.org/10.1038/s41529-025-00576-9 |
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| author | Mélanie Taron Stéphane Gin Huseyin Kaya Jean-Marc Delaye Seong H. Kim |
| author_facet | Mélanie Taron Stéphane Gin Huseyin Kaya Jean-Marc Delaye Seong H. Kim |
| author_sort | Mélanie Taron |
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| description | Abstract Physical and chemical properties of passivating alteration gels formed on alumino-boro-silicate glasses of interest for nuclear waste containment are reported. Opposite effects of B and Al on the gel’s propensity to restructure and become passivating were observed. Boron, primarily forming Si‒O‒B bonds, fragments and weakens the silicate network if its concentration is higher than a critical value, leading to the formation of pores and Si‒OH terminations as it leaches out. The greater the number of the silanol groups, the more effective the recondensation (Si‒OH + Si‒OH ⇌ Si‒O‒Si + H2O) is, leading to reduction of pore connectivity; this facilitates passivation and thus lowers the glass alteration rate. Conversely, Al has a slowing effect on this reorganization dynamics. This work provides better insight into the role of elements in the glass alteration kinetics. |
| format | Article |
| id | doaj-art-1e05c2e2f9124a2086a427ae60db42fb |
| institution | OA Journals |
| issn | 2397-2106 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
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| series | npj Materials Degradation |
| spelling | doaj-art-1e05c2e2f9124a2086a427ae60db42fb2025-08-20T02:34:15ZengNature Portfolionpj Materials Degradation2397-21062025-05-019111210.1038/s41529-025-00576-9Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel propertiesMélanie Taron0Stéphane Gin1Huseyin Kaya2Jean-Marc Delaye3Seong H. Kim4CEA, DES, ISEC, DPME, SEME, University of Montpellier, MarcouleCEA, DES, ISEC, DPME, SEME, University of Montpellier, MarcouleDepartment of Materials Science & Engineering, The Pennsylvania State UniversityCEA, DES, ISEC, DPME, SEME, University of Montpellier, MarcouleDepartment of Chemical Engineering and Materials Research Institute, The Pennsylvania State UniversityAbstract Physical and chemical properties of passivating alteration gels formed on alumino-boro-silicate glasses of interest for nuclear waste containment are reported. Opposite effects of B and Al on the gel’s propensity to restructure and become passivating were observed. Boron, primarily forming Si‒O‒B bonds, fragments and weakens the silicate network if its concentration is higher than a critical value, leading to the formation of pores and Si‒OH terminations as it leaches out. The greater the number of the silanol groups, the more effective the recondensation (Si‒OH + Si‒OH ⇌ Si‒O‒Si + H2O) is, leading to reduction of pore connectivity; this facilitates passivation and thus lowers the glass alteration rate. Conversely, Al has a slowing effect on this reorganization dynamics. This work provides better insight into the role of elements in the glass alteration kinetics.https://doi.org/10.1038/s41529-025-00576-9 |
| spellingShingle | Mélanie Taron Stéphane Gin Huseyin Kaya Jean-Marc Delaye Seong H. Kim Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties npj Materials Degradation |
| title | Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties |
| title_full | Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties |
| title_fullStr | Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties |
| title_full_unstemmed | Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties |
| title_short | Impact of B and Al on the initial and residual dissolution rate of alumino-boro-silicate glasses. Part II: gel properties |
| title_sort | impact of b and al on the initial and residual dissolution rate of alumino boro silicate glasses part ii gel properties |
| url | https://doi.org/10.1038/s41529-025-00576-9 |
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