使用超极化129Xe核磁共振光谱法探究有机气凝胶中孔隙的几何结构和连通性。
Probing the geometry and interconnectivity of pores in organic aerogels using hyperpolarized 129XE NMR spectroscopy.
作者信息
Moudrakovski I L, Wang L-Q, Baumann T, Satcher J H, Exarhos G J, Ratcliffe C I, Ripmeester J A
机构信息
Steacie Institute for Molecular Sciences, National Research Council, Ottawa, Ontario, Canada.
出版信息
J Am Chem Soc. 2004 Apr 28;126(16):5052-3. doi: 10.1021/ja049577x.
Hyperpolarized (HP) 129Xe NMR was used for the first time to probe the geometry and interconnectivity of pores in RF aerogels and to correlate them with the [resorcinol]/[catalyst] (R/C) ratio. We have demonstrated that HP 129Xe NMR is an ideal method for accurately measuring the volume-to-surface-area (Vg/S) ratios for soft mesoporous materials without using any geometric models. The Vg/S parameter, which is related both to the geometry and the interconnectivity of the porous space, has been found to correlate strongly with the R/C ratio and exhibits an unusually large span: an increase in the R/C ratio from 50 to 500 results in about 5-fold rise in Vg/S. Unlike conventional techniques, HP 129Xe NMR spectroscopy probes the geometry and interconnectivity of the nano- or mesopores in soft materials, providing new insights into the pore structure.
首次使用超极化（HP）129Xe核磁共振来探测射频气凝胶中孔隙的几何形状和连通性，并将它们与间苯二酚/催化剂（R/C）比例相关联。我们已经证明，HP 129Xe核磁共振是一种无需使用任何几何模型就能精确测量软质介孔材料体积与表面积（Vg/S）比的理想方法。已发现与多孔空间的几何形状和连通性都相关的Vg/S参数与R/C比例密切相关，并且呈现出异常大的跨度：R/C比例从50增加到500会导致Vg/S增加约5倍。与传统技术不同，HP 129Xe核磁共振光谱法探测软质材料中纳米孔或介孔的几何形状和连通性，为孔隙结构提供了新的见解。
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