“…However, there is insufficient knowledge of the hydration-dehydration mechanism for smectite / water or, more specifically, the structural and thermodynamic features of smectites as a function of hydration. Gailhanou et al [16,17] have studied the standard enthalpy of formation (∆ f H 0 ), entropy (S 0 ), and heat capacity of smectite MX-80, illite IMt-2, and illite/smectite ISCz-1 using lowtemperature adiabatic calorimetry for both the hydrated and anhydrous phases. Nevertheless, this previous set of thermodynamic properties is incomplete, and no data can be found in the literature describing the dehydration enthalpies corresponding to the different stages of hydration of the entire alkali series of homoionic montmorillonites.…”