|
|
 |
|||||||||||||||||
|
|||||||||||||||||
 |
|||||||||||||||||
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
1 Laboratoire Environnement et Minéralurgie, INPL-ENSG-CNRS UMR 7569, Avenue du Charmois, BP40, 54501 Vandoeuvre Cedex, France
2 Laboratoire de Chimie Physique et Microbiologie pour l’Environnement, UHP-CNRS UMR 7564, 405 route de Vand
uvre, 54600 Villers-les-Nancy, France
3 ANDRA Parc de la Croix Blanche 1/7 rue Jean Monnet 92298 Chatenay Malabry Cedex, France
4 ISTO, UMR 6113, CNRS-Université d’Orléans, 1A, Rue de la Férollerie, 45071 Orléans Cedex 2, France
Correspondence: * E-mail: laurent.michot{at}ensg.inpl-nancy.fr
This paper concerns the hydration and swelling behavior of four synthetic sodium saponite samples with general formula Nax(Si4–x,Alx)(Mg3)O10(OH)2, where x = 0.4, 0.5, 0.6, and 0.7. The combination of gravimetric water adsorption measurements and X-ray diffraction experiments under controlled water pressure allows us to analyze the influence of layer charge on swelling mechanisms. When the layer charge increases, swelling occurs for lower values of the chemical potential, i.e., at lower relative pressure. In parallel, as the cohesion between layers increases with increasing layer charge, a greater amount of water is needed to initiate swelling for higher-charged samples. In this last case, due to the proximity of interlayer cations, the transition between the one layer and two-layer hydrate occurs before the sodium cations are surrounded by a complete hydration sphere. This study also shows that the "one-layer" or "two-layer" hydrates cannot be considered as defined states as they appear to be modified with both layer charge and relative pressure.
This article has been cited by other articles:
|
|
 |
|
  G. Kosakowski, S. V. Churakov, and T. Thoenen DIFFUSION OF Na AND Cs IN MONTMORILLONITE Clays and Clay Minerals, April 1, 2008; 56(2): 190 - 206. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. YENIYOL Characterization of a Mg-rich and low-charge saponite from the Neogene lacustrine basin of Eskisehir, Turkey Clay Minerals, December 1, 2007; 42(4): 541 - 548. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 E. Ferrage, B. Lanson, B. A. Sakharov, N. Geoffroy, E. Jacquot, and V. A. Drits Investigation of dioctahedral smectite hydration properties by modeling of X-ray diffraction profiles: Influence of layer charge and charge location American Mineralogist, October 1, 2007; 92(10): 1731 - 1743. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Ferrage, C. A. Kirk, G. Cressey, and J. Cuadros Dehydration of Ca-montmorillonite at the crystal scale. Part I: Structure evolution American Mineralogist, July 1, 2007; 92(7): 994 - 1006. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
E. Ferrage, C. A. Kirk, G. Cressey, and J. Cuadros Dehydration of Ca-montmorillonite at the crystal scale. Part 2. Mechanisms and kinetics American Mineralogist, July 1, 2007; 92(7): 1007 - 1017. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
A. Bauer, B. Lanson, E. Ferrage, K. Emmerich, H. Taubald, D. Schild, and B. Velde The fate of smectite in KOH solutions American Mineralogist, August 1, 2006; 91(8-9): 1313 - 1322. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Sanz, J.-L. Robert, M. Diaz, and I. Sobrados Influence of charge location on 29Si NMR chemical shift of 2:1 phyllosilicates American Mineralogist, April 1, 2006; 91(4): 544 - 550. [Abstract] [Full Text] [PDF]
|
|
| JOURNAL HOME | HELP | CONTACT PUBLISHER | SUBSCRIBE | ARCHIVE | SEARCH | TABLE OF CONTENTS |
