Hydration-Induced Local Molecular Structures in Nano-Layered Clay Particles

Journal Of, Nano-And Electronic Physics
2013 unpublished
Positronium (Ps) annihilation spectroscopy and thermogravimetry and differential thermal analysis (TG-DTA) were conducted for synthetic smectite clay minerals to investigate local molecular structures i n-duced by water adsorption and desorption. The TG curves indicate the weight loss of ~ 3.5 wt , ~ 2.5 wt , and ~ 2.0 wt  for saponite, hectorite, and stevensite due to dehydration, in accordance with DTA endothermic peaks around 332 K, 350 K, and 345 K. It is found based on the results of Ps
more » ... lifetime spectroscopy that the presence of angstrom-scale open space is sensitively dependent on water adsorption and desorption in smectite clay minerals.