Salles Fabrice, Douillard Jean-Marc, Denoyel Renaud, Bildstein Olivier, Jullien Michel, Beurroies Isabelle, Van Damme Henri
CEA, DEN, SMTM/Laboratoire de Modélisation des Transferts dans l'Environnement, Cadarache, F-13108 Saint-Paul-lez-Durance, France.
J Colloid Interface Sci. 2009 May 15;333(2):510-22. doi: 10.1016/j.jcis.2009.02.018. Epub 2009 Mar 20.
In order to identify the key steps and the driving force for the hydration process of swelling clays, the water adsorption isotherms and enthalpies were measured on monoionic montmorillonite samples saturated with alkali or calcium ions, and on bi-ionic samples saturated with a sodium-calcium mixture. The specific surface area evolution along the hydration process was determined using a recent interpretation of the experimental adsorption isotherms of swelling solids. Results are interpreted in structural terms. Compared with additional data from sample-controlled thermal analysis (SCTA), the results confirm experimentally that the hydration of Li- and Na-montmorillonite is mainly a cation-controlled process, in contrast with the hydration of Cs samples in which the cation contribution to hydration is negligible, as we have already demonstrated using electrostatic calculations or conductivity measurements.
为了确定膨胀黏土水化过程的关键步骤和驱动力，我们对用碱离子或钙离子饱和的单离子蒙脱石样品以及用钠钙混合物饱和的双离子样品测量了水吸附等温线和焓。利用对膨胀固体实验吸附等温线的最新解释确定了水化过程中比表面积的变化。结果从结构角度进行了解释。与来自样品控制热分析（SCTA）的其他数据相比，结果通过实验证实，锂蒙脱石和钠蒙脱石的水化主要是阳离子控制过程，这与铯样品的水化形成对比，在铯样品中阳离子对水化的贡献可忽略不计，正如我们已经通过静电计算或电导率测量所证明的那样。
