Factors Affecting the Microstructure of Smectites: Role of Cation and History of Applied Stresses
H. Ben Rhaïem, C. H. Pons, D. Tessier, 1985. "Factors Affecting the Microstructure of Smectites: Role of Cation and History of Applied Stresses", Proceedings of the International Clay Conference Denver, 1985, Leonard G. Schultz, H. van Olphen, Frederick A. Mumpton
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Small-angle X-ray scattering and transmission electron microscopy were used to determine the microstructure of Ca- and Na-smectite pastes. Samples were examined during drying and during rewetting at room temperature in an ultrafiltration cell by varying the suction pressure. The microstructure of Ca-smectite in (10−3 M CaCl2) at suction pressures corresponding to high water contents ( ≤ 1 bar) appears to consist of a network of quasi-crystals containing pores about 1 μm in size. The network walls result from the face-to-face bonding of 50 to about 400 layers, depending on the suction pressure and the previous degree of drying. For Na-smectites in a 10−3 M NaCl solution at low suction pressure ( ≤ 0.1 bar), the tactoids were found to consist of a few layers (≤10), and the water was found to be located essentially between the layers inside the tactoids.
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Proceedings of the International Clay Conference Denver, 1985
The papers included in this proceedings volume are representative of the research on clays being conducted in all parts of the world at the time of publication. Many of the subjects treated are controversial, and although some ideas expressed may not necessarily represent the views of the editors, the referees, or the publisher, they deserve to be brought to the attention of the international clay community.