Fast characterization of functionalized silica materials by silicon-29 surface-enhanced NMR spectroscopy using dynamic nuclear polarization.
J Am Chem Soc
; 133(7): 2104-7, 2011 Feb 23.
Article
in En
| MEDLINE
| ID: mdl-21280606
ABSTRACT
We demonstrate fast characterization of the distribution of surface bonding modes and interactions in a series of functionalized materials via surface-enhanced nuclear magnetic resonance spectroscopy using dynamic nuclear polarization (DNP). Surface-enhanced silicon-29 DNP NMR spectra were obtained by using incipient wetness impregnation of the sample with a solution containing a polarizing radical (TOTAPOL). We identify and compare the bonding topology of functional groups in materials obtained via a sol-gel process and in materials prepared by post-grafting reactions. Furthermore, the remarkable gain in time provided by surface-enhanced silicon-29 DNP NMR spectroscopy (typically on the order of a factor 400) allows the facile acquisition of two-dimensional correlation spectra.
Full text:
1
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Journal:
J Am Chem Soc
Year:
2011
Type:
Article
Affiliation country:
France