Abstract
The adsorbents studied were samples of a precipitated silica, covered with a dense layer of (3,3-dimethylbutyl)dimethylsiloxy-, (5-cyano-3,3-dimethylpentyl)-dimethylsiloxy-and tetradecyldimethylsiloxy-substituents. Deuteration of unreacted silanols across the graft was investigated, using dilute solutions of hydroxy-deuterated water, methanol and ethanol in acetonitrile. Excess adsorption isotherms of the solutes were also determined. The results suggest that access to all silanols is sterically hindered by the surface substituents but to different extends. They are accessible in a time average through occasional holes in the graft, formed by the lateral vibrational motion of the substituents.
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