NDLI: 29Si, 27Al, 1H and 23Na MAS NMR Study of the Bonding Character in Aluminosilicate Inorganic Polymers

Content Provider	Springer Nature Link
Author	Rowles, M. R. Hanna, J. V. Pike, K. J. Smith, M. E. O'Conr, B. H.
Copyright Year	2007
Abstract	29Si, 27Al, 1H and 23Na solid-state magic-angle spinning (MAS) nuclear magnetic resonance (NMR) has been used to relate nominal composition, bonding character and compressive strength properties in aluminosilicate inorganic polymers (AIPs). The 29Si chemical shift varies systematically with Si-to-Al ratio, indicating that the immediate structural environment of Si is altering with nominal composition. Fast 1H MAS and 29Si T SiH/T 1ρ relaxation measurements demonstrated that occluded pore H2O mobility within the disordered cavities is slow in comparison with H2O mobility characteristics observed within the ordered channel structures of zeolites. The 27Al MAS NMR data show that the Al coordination remains predominantly 4-coordinate. In comparison with the 29Si MAS data, the corresponding 27Al MAS line shapes are relatively narrow, suggesting that the AlO4 tetrahedral geometry is largely unperturbed and the dominant source of structural disorder is propagated by large distributions of Si–O bond angles and bond lengths. Corresponding 23Na MAS and multiple-quantum MAS NMR data indicate that Na speciation is dominated by distributions of hydration states; however, more highly resolved 23Na resonances observed in some preparations supported the existence of short-range order. New structural elements are proposed to account for the existence of these Na resonances and an improved model for the structure of AIPs has also been proposed.
Starting Page	663
Ending Page	689
Page Count	27
File Format	PDF
ISSN	09379347
Journal	Applied Magnetic Resonance
Volume Number	32
Issue Number	4
e-ISSN	16137507
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-01-01
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electromagnetism, Optics and Lasers Analytical Chemistry
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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