期刊
JOURNAL OF MAGNETIC RESONANCE
卷 221, 期 -, 页码 19-23出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2012.05.018
关键词
Double cross-polarization; High-gamma spin detection; F-19-Si-29 and F-19-C-13 connectivities; Fluoride ions in cement; Calcium silicate hydrate (C-S-H) phase
资金
- Danish Natural Science Research Council
- Danish Technical Science Research Council
- Teknologistyrelsen
- Carlsbergfondet
- Direktor lb Henriksens Fond
- Danish National Advanced Technology Foundation
A new version of the double cross-polarization MAS NMR experiment, which transfers polarization Forth and Back (FBCP) between high- and low-gamma spin nuclei, is presented. The pulse sequence is demonstrated by F-19-{Si-29}-F-19 and F-19-{C-13}-F-19 FBCP NMR spectra of a mixture of cuspidine (Ca4Si2O7F2) and Teflon (-CF2-)(n). The experiment is useful for assignment of the high-gamma spin resonances, as demonstrated by F-19-{Si-29}-F-19 FBCP NMR of a fluoride-containing calcium-silicate-hydrate (C-S-H) phase, where the F-19 resonance from fluoride ions incorporated in the interlayer structure of the C-S-H phase is identified. (C) 2012 Elsevier Inc. All rights reserved.
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