Abstract
Abstract Competition experiments between alkali counterions and tetraalkylammonium cations for interaction with a clay (laponite) surface have been monitored by7Li and23Na NMR. As a result of a stronger interaction of sodium cations, an increase of the23Na NMR visibility is observed with the addition of the organic salt. Multiple-quantum-coherence spectra have been used to investigate the behaviors of the alkali cations. The variation in both7Li and23Na half bandwidths reflects the monolayer formation of tetraalkylammonium cations at the laponite surface.
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