Multi-nuclear Solid-State NMR Studies Of Layered Silicate Materials

In this dissertation, the principle of solid-state NMR spectroscopy and its application in layered silicate materials were reviewed, and multinuclear solid-state NMR techniques were used to study two kinds of layered silicate materials; one is montmorillonite intercalated with organic cations (dodecyltrimethylammonium, DDTMA⁺) and the other is layered sodium disilicate SKS-6.For montmorillonite intercalated with DDTMA⁺, the arrangement, conformation, and mobility of organic cations in the interlayer of montmorillonite prepared with different pillaring reagent concentrations have been studied by 13C relaxation time measurement, cross-polarization dynamics, and two-dimensional proton wide-line separation (2D WISE) spectroscopy. The results indicate that the arrangement of DDTMA⁺ and the mobility of various groups are different, depending on the pillaring concentration, but the conformations of alkyl chains are similar. In addition, the mobility is much different for various groups at a given concentration and for a given group at different concentrations.For SKS-6,¹H, ²⁹Si NMR and ²³Na MQMAS NMR spectroscopy combined with XRD technique were used to study the reaction between SKS-6 and calcium chloride solution with different concentrations. Based on the experimental results the calcium ion extracting mechanism of SKS-6 was demonstrated to be via ion replacement, during which calcium ions replace sodium ions and combine with the non-bridging oxygen in SKS-6 for charge compensation, and simultaneously sodium ions leave the...