Small-Angle X-Ray Scattering Study of the Quasi-Crystal Structure of Montmorillonite-CTAB in Suspension
- C. Shanga,
- J. A. Rice *a and
- J. S. Linb
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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