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

Автори K. Sato, K. Numata
Приналежність

Department of Environmental Sciences, Tokyo Gakugei University, Koganei, 184-8501 Tokyo, Japan

Е-mail sato-k@u-gakugei.ac.jp
Випуск Том 5, Рік 2013, Номер 1
Дати Одержано 06.09.2012, опубліковано online - 28.03.2013
Посилання K. Sato, K. Numata, J. Nano- Electron. Phys. 5 No 1, 01002 (2013)
DOI
PACS Number(s) 78.70.Bj, 68.43. – h
Ключові слова Smectite, Clay mineral, Positronium.
Анотація Positronium (Ps) annihilation spectroscopy and thermogravimetry and differential thermal analysis (TG-DTA) were conducted for synthetic smectite clay minerals to investigate local molecular structures induced 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 lifetime spectroscopy that the presence of angstrom-scale open space is sensitively dependent on water adsorption and desorption in smectite clay minerals.

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