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• W1972865669 endingPage "7415" @default.
• W1972865669 startingPage "7406" @default.
• W1972865669 abstract "Hydrous aluminosilicate glasses of composition NaAlSi8O18, NaAlSi3O8, NaAlSi2O6, and NaAlSiO4 have been studied with 1H MAS, and 1H/27Al, and 1H/23Na TRAPDOR NMR spectroscopy. Two different environments for molecular water were identified. Three 1H OH resonances (1.5, ca. 3.5, and 5−6 ppm) are observed in all the glasses. The resonance at 1.5 ppm shows a large 1H−27Al dipolar coupling and is assigned an Al(Q3)−OH group; the concentration of this species increases with increasing Al content in the glass. The resonance at ca. 3.5 ppm is assigned to Si(Q3)−OH units, on the basis of its chemical shift, proximity to Na and Al, and the change in the relative intensity of the three resonances, with varying Al/Si ratio. The resonance at 5−6 ppm is assigned to a Q3−OH unit that is hydrogen bonded to another oxygen atom. These assignments imply that the aluminosilicate framework undergoes depolymerization as an outcome of water dissolution." @default.
• W1972865669 created "2016-06-24" @default.
• W1972865669 creator A5000176555 @default.
• W1972865669 creator A5006073971 @default.
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• W1972865669 date "1999-08-14" @default.
• W1972865669 modified "2023-10-03" @default.
• W1972865669 title "Proton Environments in Hydrous Aluminosilicate Glasses: A ¹H MAS, ¹H/²⁷Al, and ¹H/²³Na TRAPDOR NMR Study" @default.
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• W1972865669 doi "https://doi.org/10.1021/jp990726l" @default.
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