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Small-Angle X-Ray Scattering Study of the Quasi-Crystal Structure of Montmorillonite-CTAB in Suspension

^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

View larger version (26K): [in a new window]   Fig. 1. Small-angle x-ray scattering data for montmorillonite-hexadecyltrimethylammonium bromide complexes in dilute aqueous suspensions and flocs. CEC = cation exchange capacity, I = intensity, q = the scattering vector.

View larger version (26K): [in a new window]   Fig. 2. Guinier plots of small-angle x-ray scattering data for montmorillonite in dilute suspensions with varying amounts of hexadecyltrimethylammonium bromide adsorbed. The Guinier Approximation states that: ln[I(q)q2] = constant – R2gq2 for thin layer scatters, where CEC = cation exchange capacity, I = intensity, q = the scattering vector, and Rg is the radius of gyration for thickness.

View larger version (16K): [in a new window]   Fig. 3. Curve fitting to experimental Porod plot using Eq. [2] to find the number of clay layers per quasi-crystal at the hexadecyltrimethylammonium bromide loading of 100% cation exchange capacity. I = intensity, N = number of planar lamellae, q = the scattering vector.