Abstract
The structure at the liquid/solid interface of a lithiated saponite is monitored by NMR methods. For clay suspensions in water/methanol mixtures, the two components at the clay interface are correlated: the liquid structure is enhanced until alcohol molar ratios of ca. 0.1. With acetone as a cosolvent, water and acetone molecules behave independently. As the ketone content increases, acetone molecules penetrate more extensively into the interfacial region, solvating exchangeable lithium ions; water molecules at the clay surface are not significantly affected. A similar behavior is observed with acetonitrile as a cosolvent.
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