Abstract
The 13C NMR spin lattice relaxation times have been measured for suspensions of chemically bonded silica particles in solutions of an organic base in deuteroacetonitrile, CD3CN, at different base concentrations. A correlation has been observed between the relaxation rates and the ratio of the amounts of base and silica in the suspension. Thus, silanophilic interactions of chemically bonded silicas can be monitored using 13C NMR relaxation rates. The correlation is interpreted in terms of the rapid exchange model. The method seems to have potential for the rapid and accurate determination of equilibrium isotherms.
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