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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Si-29 CPMAS NMR and near-IR study of sol-gel microporous silica with tunable surface area
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Si-29 CPMAS NMR and near-IR study of sol-gel microporous silica with tunable surface area

机译：具有可调表面积的溶胶-凝胶微孔二氧化硅的Si-29 CPMAS NMR和近红外研究

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High-resolution solid-state NMR and IR techniques were used to investigate the surface structure of microporous silica with tunable surface areas, obtained by a sot get method acting on a variation of gelation time. Si-29 MAS NMR and Med-IR evidenced a similar number of silanol groups in all the silicas. Near-IR results revealed the existence of a different ratio of hydrogen bonded silanols and free silanols as a function of surface area. Si-29 CP-MAS experiments, including CP spin dynamics studies, were employed to probe hydrogen bonding and local structural environments of various hydroxyl groups of silica surface. These studies showed that for high surface area silicas both free and hydrogen bonded silanols are present at the surface of the samples and the amount of free silanol groups increases with the increasing of the surface area of the samples. (c) 2005 Elsevier B.V. All rights reserved.
机译：高分辨率固态NMR和IR技术用于研究具有可变表面积的微孔二氧化硅的表面结构，该方法是通过作用于胶凝时间变化的soget方法获得的。 Si-29 MAS NMR和Med-IR证明所有二氧化硅中的硅烷醇基团数量均相似。近红外结果表明，存在不同比例的氢键合硅烷醇和游离硅烷醇，它们是表面积的函数。使用Si-29 CP-MAS实验（包括CP自旋动力学研究）来探测氢键和二氧化硅表面各种羟基的局部结构环境。这些研究表明，对于高表面积的二氧化硅，样品表面均存在游离和氢键合的硅烷醇，并且游离硅烷醇基团的数量随样品表面积的增加而增加。 （c）2005 Elsevier B.V.保留所有权利。

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