“…Hydration-dehydration behaviour of bentonite, consisting mostly of montmorillonite, has been widely studied in view of heat storage uses [ 310 , 313 , 316 , 317 , 318 , 319 , 320 ]. Konta compared bentonites with different compensating cations, such as Ca 2+ and Na + [ 311 ], and concluded that Na-bentonite tended to be highly dispersed in water, whereas Ca-bentonite showed a tendency to coagulate.…”