Abstract
Publisher Summary Nuclear magnetic resonance (NMR) spectroscopy provides information on both the structural and dynamic aspects of solids, including clay minerals. The application of multinuclear high-resolution NMR spectroscopy over the past two decades provided valuable information on the structures of phyllosilicates, such as crystallographic sites, cation coordination, silicate network distortion, and cation distributions. However, conventional low-resolution NMR spectroscopy is still useful for investigating the surface orientation of adsorbed molecules and their mobility. In situ reactions among co-adsorbed molecules or between adsorbed species and clay mineral surfaces can now be studied by high-resolution NMR—magic-angle spinning (MAS) and cross-polarization MAS (CP-MAS) techniques. The formation of pillared clays was extensively studied by multinuclear NMR spectroscopy. The same can be said for zeolite formation by alkali treatment of clay minerals. These developments have important implications for the industrial applications of clays and clay minerals.
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