29Si MAS solid state and 129Xe NMR of porous silica

The condensation of surface hydroxyl groups of silica after high-temperature treatment has been studied by 29Si MAS solid state and 129Xe NMR spectroscopy. Above 500°C, the number of surface hydroxyl groups is diminished and intraparticle 129Xe species, which reside in the pores of silica and rapidl...

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Bibliographic Details
Published in:Magnetic resonance imaging 1996, Vol.14 (7), p.993-994
Main Authors: Oepen, S.B., Günther, H.
Format: Article
Language:English
Subjects:
Biological and medical sciences
Earth sciences
Earth, ocean, space
Exact sciences and technology
Exchange
Investigative techniques, diagnostic techniques (general aspects)
Isotopes
Magnetic Resonance Spectroscopy
Medical sciences
Mineralogy
Otorhinolaryngology. Stomatology. Orbit
Porosity
Radiodiagnosis. Nmr imagery. Nmr spectrometry
Silica
Silicates
Silicium solid-state NMR
Silicon
Silicon Dioxide
Xenon Isotopes
Xenon NMR
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Summary:The condensation of surface hydroxyl groups of silica after high-temperature treatment has been studied by 29Si MAS solid state and 129Xe NMR spectroscopy. Above 500°C, the number of surface hydroxyl groups is diminished and intraparticle 129Xe species, which reside in the pores of silica and rapidly exchange between pores of different size, are increasingly shielded. Chemical exchange between intraparticle xenon with xenon in interparticle voids is also enhanced upon thermal treatment of silica and can be monitored by 2D EXSY spectroscopy.
ISSN:0730-725X
1873-5894
DOI:10.1016/S0730-725X(96)00204-4