Title :

Thermal behavior of waterglass: foaming and xerogel-to-glass evolution

Author(s) :

Mohsin, Hamza [Auteur]
Laboratoire de physique de la matière condensée [LPMC]
Surface du Verre et Interfaces [SVI]
Maron, Sébastien [Auteur]
Laboratoire de physique de la matière condensée [LPMC]
Maurin, Isabelle [Auteur]
Laboratoire de Physique de la Matière Condensée [LPMC]
Burov, Ekaterina [Auteur]
Surface du Verre et Interfaces [SVI]
Tricot, Grégory [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Devys, Lucie [Auteur]
Saint-Gobain Recherche [SGR]
Gouillart, Emmanuelle [Auteur]
Surface du Verre et Interfaces [SVI]
Gacoin, Thierry [Auteur]
Laboratoire de physique de la matière condensée [LPMC]

Journal title :

Journal of Non-Crystalline Solids

Volume number :

566

Publication date :

2021

HAL domain(s) :

Physique [physics]/Matière Condensée [cond-mat]/Matière Molle [cond-mat.soft]

English abstract : [en]

Structural properties of aqueous Na-silicates at both room and high temperature (below 500°C) have been investigated to better understand the microscopic evolution of structure and the macroscopic phenomenon of foaming. ...
Show more >Structural properties of aqueous Na-silicates at both room and high temperature (below 500°C) have been investigated to better understand the microscopic evolution of structure and the macroscopic phenomenon of foaming. NMR spectroscopy has provided a direct quantification of structural units defined as Qn. Solid-state NMR along with Raman spectroscopy has indicated the extent of local structural reorganization on heating the silicates. Heating an aqueous Na-silicate leads to structural changes due to the removal of water, where the quantity of leftover water in the system obeys an Arrhenian evolution with an activation energy of 30 kJ.mol−1. TGA, NMR and Raman measurements suggest that the structure becomes similar to the one of hydrated silicate glasses studied in geochemistry. Increasing the Na concentration results in a larger quantity of water retained after a pre-drying treatment, which correlates with a lower softening temperature of the material and is, macroscopically, related to foaming of the silicate.Show less >

Language :

Anglais

Audience :

Non spécifiée

Popular science :

Non

Administrative institution(s) :

ENSCL
CNRS
Université de Lille

Collections :

• Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516

Research team(s) :

Propriétés magnéto structurales des matériaux (PMSM)

Submission date :

2024-02-21T17:11:54Z
2024-02-27T09:00:15Z