Multinuclear NMR spectroscopy studies of silica surfaces
Conference
·
OSTI ID:86470
- Colorado State Univ., Fort Collins, CO (United States)
{sup 1}H {yields} {sup 29}Si cross polarization with magic-angle spinning is a valuable approach for observing local silicon environments on the silica surface. The {sup 1}H combined rotation and multiple-pulse spectroscopy (CRAMPS) approach distinguishes clustered and isolated surface silanols. Correlations of the variations in {sup 29}Si and {sup 1}H peak intensities with silane loading level in silica gels derivatized with (CH{sub 3}){sub 3}SiCl suggest an incorrect model of the silica surface that is inconsistent with models derived from more detailed considerations. Other nuclides (e.g., {sup 2}H, {sup 13}C, and {sup 15}N, along with {sup 29}Si) provide valuable approaches for the characterization of local structure and motion in derivatized (silylated) silicas. 55 refs., 8 figs.
- OSTI ID:
- 86470
- Report Number(s):
- CONF-900802--; CNN: Grant CHE-9021003; Grant CHE-8616437
- Country of Publication:
- United States
- Language:
- English
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