Elementary Layers in the Interstratified Clay Minerals as Revealed by Electron Microscopy

Tsunoru Yoshida
Institute for Chemical Research, Kyoto University, Uji-Ski, Kyoto, Japan

Abstract: Interstratified layer structures were studied by electron microscopy and electron diffraction. In order to distinguish between expansible and non-expansible layers, interstratified mica-smectite was treated with laurylamine hydrochloride solution. Electron micrographs of the layers at the curled edges of the crystals show expanded basal spacings of 24 Å and unexpanded spacings of 10 Å. It was observed that adjacent pairs of expanded and unexpanded layers in the micrographs form non-expansible units. Arrangement of the expanded and unexpanded layers shows that the layers expanded by sorption of laurylammonium ions have expansible and non-expansible surface characteristics on opposite sides of the layer. The relationships between the ratio of component layers and basal spacings in two component systems are discussed.

Clays and Clay Minerals; October 1973 v. 21; no. 5; p. 413-420; DOI: 10.1346/CCMN.1973.0210517
© 1973, The Clay Minerals Society
Clay Minerals Society (www.clays.org)