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This article in SSSAJ

  1. Vol. 66 No. 4, p. 1225-1230
    Received: June 20, 2001

    * Corresponding author(s): james_rice@sdstate.edu
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Small-Angle X-Ray Scattering Study of the Quasi-Crystal Structure of Montmorillonite-CTAB in Suspension

  1. C. Shanga,
  2. J. A. Rice *a and
  3. J. S. Linb
  1. a Dept. of Chemistry and Biochemistry, South Dakota State Univ., Brookings, SD 57007-0896
    b Solid State Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831


The quasi-crystals of hexadecyltrimethylammonium (CTA+)-montmorillonite formed in suspension were investigated by small-angle x-ray scattering (SAXS). The d-spacing of the quasi-crystals increased from 17.1 to 21.7 Å, corresponding to an increasing surfactant loading from 20 to 250% of the clay's cation exchange capacity (CEC). One-dimensional grating theory was used to describe the scattering in the Porod region so that the number of clay layers and crystal size were obtained. The quasi-crystal reaches maximum size at a surfactant loading equal to the clay's CEC. The scattering peaks in the Porod region are due solely to quasi-crystals. Small-angle x-ray scattering avoids intermediate peaks resulting from the artificial interstratification of free and complexed layers in conventional x-ray diffraction analysis.

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Copyright © 2002. Soil Science SocietyPublished in Soil Sci. Soc. Am. J.66:1225–1230.