 |
Article dans une revue
Influence of montmorillonite tactoid size on Na-Ca cation exchange reactions.
Abstract : The spatial organisation of swelling clay platelets in a suspension depends on the chemical composition of the equilibration solution. Individual clay platelets can be well dispersed, with surfaces entirely in contact with the external solution, or be stacked in tactoids, where part of the surfaces forms parallel alignments embedding interlayer water and cations. External and interlayer surfaces do not exhibit similar affinities for cations having different hydration and charge properties and the clay platelet stacking arrangement influences the clay affinity for these cations. This paper aims to establish the link between exchange properties and clay tactoid size and organisation for Na-Ca exchange on montmorillonite. Different montmorillonite samples behave differently with regards to Na-Ca exchange, from ideal to non-ideal exchange behaviour. A simple model coupling the tactoid stacking size to different Na/Ca relative affinities of the external and interlayer clay surfaces enables these differences to be reproduced.
Littérature citée [21 références]
https://hal-brgm.archives-ouvertes.fr/hal-00664233
Contributeur : Christophe Tournassat <>
Soumis le : lundi 30 janvier 2012 - 10:28:32
Dernière modification le : mardi 23 janvier 2018 - 11:18:02
Archivage à long terme le : : mercredi 14 décembre 2016 - 01:54:59
Contributeur : Christophe Tournassat <>
Soumis le : lundi 30 janvier 2012 - 10:28:32
Dernière modification le : mardi 23 janvier 2018 - 11:18:02
Archivage à long terme le : : mercredi 14 décembre 2016 - 01:54:59
Fichier
Echange_cat_HAL.pdf
Fichiers éditeurs autorisés sur une archive ouverte