Effects of proton-proton spin exchange in the silicon-29 CP-MAS NMR spectra of the silica surface

1992 ◽  
Vol 96 (10) ◽  
pp. 4027-4034 ◽  
Author(s):  
I Ssuer Chuang ◽  
David R. Kinney ◽  
Charles E. Bronnimann ◽  
Robert C. Zeigler ◽  
Gary E. Maciel
Keyword(s):  
Nmr Spectra ◽  
Spin Exchange ◽  
Silica Surface ◽  
Proton Spin ◽  
Mas Nmr ◽  
Proton Proton ◽  
Cp Mas Nmr

Hydration effects in the carbon-13 CP/MAS NMR spectra of solid (1 →3)-β-D-glucans

1984 ◽  
Vol 17 (3) ◽  
pp. 501-502 ◽  
Author(s):  
C. A. Fyfe ◽  
P. J. Stephenson ◽  
M. G. Taylor ◽  
T. L. Bluhm ◽  
Y. Deslandes ◽  
...  
Keyword(s):  
Nmr Spectra ◽  
Mas Nmr ◽  
Cp Mas Nmr

Proton spin-diffusion in PVDF: a 1H–19F CP/MAS NMR study

1999 ◽  
Vol 1 (15) ◽  
pp. 3549-3555 ◽  
Author(s):  
Peter Holstein ◽  
Gustavo A. Monti ◽  
Robin K. Harris
Keyword(s):  
Spin Diffusion ◽  
Proton Spin ◽  
Mas Nmr ◽  
Nmr Study ◽  
Cp Mas Nmr

ChemInform Abstract: HIGH-RESOLUTION CARBON-13 CP/MAS NMR SPECTRA OF SOLID CELLULOSE OLIGOMERS AND THE STRUCTURE OF CELLULOSE II

1983 ◽  
Vol 14 (31) ◽  
Author(s):  
R. L. DUDLEY ◽  
C. A. FYFE ◽  
P. J. STEPHENSON ◽  
Y. DESLANDES ◽  
G. K. HAMER ◽  
...  
Keyword(s):  
High Resolution ◽  
Nmr Spectra ◽  
Mas Nmr ◽  
Cellulose Ii ◽  
Cp Mas Nmr

13C CP/MAS-NMR spectra of organic matter as influenced by vegetation, climate, and soil characteristics in soils from Murcia, Spain

2002 ◽  
Vol 82 (4) ◽  
pp. 403-411 ◽  
Author(s):  
A. Faz Cano ◽  
A R Mermut ◽  
R. Ortiz ◽  
M B Benke ◽  
B. Chatson
Keyword(s):  
Organic Matter ◽  
Functional Groups ◽  
Plant Community ◽  
Nmr Spectra ◽  
Climatic Conditions ◽  
Parent Material ◽  
Mas Nmr ◽  
Soil Parameters ◽  
Organic C ◽  
Cp Mas Nmr

Soils in southern Spain are low in organic matter (OM) and nutrients. Understanding the nature and dynamics of OM has potential to improve soil management technologies for sustainable crop production. The objective of this work was to establish the distribution of functional groups in organic-C from these soils using 13C CP/MAS-NMR spectroscopy and to investigate the influence of vegetation, climatic conditions, soil parameters, parent material, and soil order on these functional groups. No statistically significant variability in the distribution of organic-C groups was found as a result of the influence of either soil order or parent material. The content of O-alkyl-C in the soils under the Rhamno-Quercetum plant community was higher (95% probability) than in the soils under the Paronychio-Sideritidetum plant community. Soils located in the mesomediterranean climatic zone displayed a higher content of O-alkyl-C and a lower content of aromatic-C compared to the soils located in the thermomediterranean zone. These differences were statistically significant at 95% of probability. Vegetation and climatic conditions appear to play a major role in the OM decomposition processes in this region. Statistically significant and positive correlations were found between alkyl-C and both cation exchange capacity (CEC) and clay content indicating the recalcitrant nature of these organic compounds. Key words: Organic matter composition, Spanish soils, 13C CP/MAS-NMR spectra, Mediterranean soils, Alfisols, Mollisols, Aridisols

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