Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Letter
Does Water Liquid Phase Intrude into Hydrophobic Nanospaces of Alkyl-grafted Mesoporous Silica Immersed in Water? Detection by 13C CP-MAS NMR
Kei InumaruShintaro KakiiHiroto YoshidaShoji Yamanaka
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2010 Volume 39 Issue 11 Pages 1215-1217

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Abstract

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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© 2010 The Chemical Society of Japan
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