title: High-speed 1H MAS NMR investigations of the weathered surface of a phosphate glass.
abstract: Solid-state high-speed 1H MAS NMR spectroscopy was used to investigate the weathered surface of a potassium aluminum phosphate (KAP) glass exposed to a humid environment (30K2O10Al2O360P2O5, mol%). Through the combination of spin-spin relaxation and double quantum (DQ) filtering it was possible to resolve seven or eight different proton environments within the weathered surface of the KAP glass. Two-dimensional (2D) DQ and 2D NOESY NMR correlation experiments were performed to probe the spatial proximity of these different proton species. These 1H-1H correlation experiments helped confirm the spectral assignments. The analysis of these different 1H environments provides additional information about the chemical processes that occur at the weathered glass surface.
authors.affiliation: Sandia National Laboratories, Department of Biomolecular and Chemical Sensing, Albuquerque, NM 87185-0886, USA. tmalam@sandia.gov
authors.forename: Todd M
authors.initials: TM
authors.lastname: Alam
authors.forename: Brad C
authors.initials: BC
authors.lastname: Tischendorf
authors.forename: Richard K
authors.initials: RK
authors.lastname: Brow