Solid-state 31P spin-lattice relaxation of silica-supported dodecamolybdophosphoric acid dramatically depends on the polyanion : SiO2 ratio for concentrations above that required for the saturation of the adsorption sites on the silica surface; this dependence allows the density of the active sites at the silica surface to be determined.
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Thouvenot et al. (1991) studied this question.
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