X-Ray Diffraction Study of Aqueous Montmorillonite Emulsions

Yoshiaki Fukushima
Toyota Central Research and Development Laboratories, Inc. Nagakute-cho, Aichi-gun, Aichi-ken 480-11, Japan

Abstract: An X-ray diffraction study of aqueous emulsions of a Na-montmorillonite shows that: (1) At low water content, the d-spacings of the montmorillonite increased stepwise with increasing water content; (2) At high water content, sharp (001) peaks due to regular stacking of montmorillonite layers were not detectable, but broad, halo patterns were observed in the low-angle scattering region; and (3) The addition of Ca2+ or H+ to the aqueous emulsions caused Ca-montmorillonite or H-montmorillonite crystals to form. A zig-zag column model of montmorillonite layers fits the observed data for aqueous emulsions of Na-montmorillonite.

Key Words: Emulsion • Layer stacking • Low angle scattering • Montmorillonite • Water • X-ray diffraction

Clays and Clay Minerals; August 1984 v. 32; no. 4; p. 320-326; DOI: 10.1346/CCMN.1984.0320410
© 1984, The Clay Minerals Society
Clay Minerals Society (www.clays.org)