A 129Xe NMR study of functionalized ordered mesoporous silica

被引：69
作者：
Mourdrakovski, IL
Terskikh, VV
Ratcliffe, CI
Ripmeester, JA
Wang, LQ
Shin, Y
Exarhos, GJ
机构：
[1] Natl Res Council Canada, Steacie Inst Mol Sci, Ottawa, ON K1A 0R6, Canada
[2] Pacific NW Natl Lab, Dept Mat Sci, Richland, WA 99352 USA
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 23期
关键词：
D O I：
10.1021/jp014585a
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this publication we report the first application of continuous flow hyperpolarized (HP) Xe-129 techniques to studies of pore structure in ordered mesoporous materials. In particular, we report extensive Xe-129 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 Xe-129 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 Xe-129 NMR data reveal a nonuniform porosity and irregular pore structure in contrast to N-2 adsorption and TEM measurements that indicate regular nanoporous channels.
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页码：5938 / 5946
页数：9
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