2010 Volume 39 Issue 11 Pages 1215-1217
In situ 13C CP-MAS NMR measurements enabled for the first time detection of the presence and absence of water liquid phase in nanospaces of alkyl-grafted mesoporous silicas through the signals of alkyl chains, when the materials were immersed in water. It was revealed that n-octyl-grafted mesoporous silica excluded liquid water from the hydrophobic nanospaces at least in an hour time scale while liquid water penetrated into n-pentyl-grafted material much faster. This is important for understanding the adsorbents in the working states in water.
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