A calorimetric study of mesoscopic swelling and hydration sequence in solid Na-montmorillonite

作者：Salles Fabrice; Beurroies Isabelle; Bildstein Olivier^*; Jullien Michel; Raynal Joel; Denoyel Renaud; Van Damme Henri

来源：Applied Clay Science, 2008, 39(3-4): 186-201.

DOI：10.1016/j.clay.2007.06.001

• clays
• montmorillonites
• hydration
• osmotic swelling
• thermoporometry
• hydration mechanism

Thermoporometry, a calorimetric technique, has been applied on solid montmorillonite samples at variable relative humidity (RH) and brings novel information on the swelling mechanism of Na-montmorillonite. Some mesopores are already filled with water in conditions where the interlamellar space is only occupied by one layer of water molecules. It was also shown that inter-particles osmotic swelling in the mesoporous range begins at a lower RH than in the interlamellar space (54% and 80%, respectively) and present a large range of expansion (from 2.25 nm to 4.00 nm in the investigated RH domain). This inter-particles swelling plays therefore a dominant role in the overall swelling process in a broad range of RH values. Combining thermoporometry with XRD results, the results were integrated in a complete hydration sequence for Na-montmorillonite.

• 出版日期2008-5
• 单位中国地震局