A 129Xe NMR study of functionalized ordered mesoporous silica

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DOIResolve DOI: http://doi.org/10.1021/jp014585a
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TypeArticle
Journal titleThe Journal Of Physical Chemistry B
ISSN1520-6106
Volume106
Issue23
Pages59385946; # of pages: 9
AbstractIn this publication we report the first application of continuous flow hyperpolarized (HP) 129Xe techniques to studies of pore structure in ordered mesoporous materials. In particular, we report extensive 129Xe NMR chemical shift measurements of xenon adsorbed in mesoporous materials of different porosities and surface chemical composition. The use of HP Xe has allowed us to work at very low concentrations of xenon where the contribution of the Xe-Xe interactions is negligible and the observed 129Xe chemical shift reflects mainly interactions between the xenon atoms and the surface. Variable temperature measurements gave access to information on the adsorption parameters of xenon, and allowed us to follow the changes in these properties due to modification of the mesopore voids. Our 129Xe NMR data reveal a nonuniform porosity and irregular pore structure in contrast to N2 adsorption and TEM measurements that indicate regular nanoporous channels.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Steacie Institute for Molecular Sciences
Peer reviewedNo
Identifier18077705
NPARC number12328499
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Record identifierceb81f66-a1d1-42a8-8174-ab1ef70d2270
Record created2009-09-10
Record modified2016-05-09
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