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NMR study of adsorption techniques for organic compounds on silica surfaces
Author(s) -
Günther Harald,
Oepen Sabine,
Ebener Michael,
Francke Volkhard
Publication year - 1999
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/(sici)1097-458x(199912)37:13<s142::aid-mrc573>3.0.co;2-1
Subject(s) - chemistry , adsorption , microcrystalline , grinding , ball mill , chemical shift , fluorine , organic chemistry , annealing (glass) , chemical engineering , inorganic chemistry , thermodynamics , crystallography , composite material , materials science , physics , engineering
The adsorption of benzenoid aromatic compounds on porous silica has been studied by 13 C and 19 F NMR and by BET measurements. Small chemical shifts between the resonances of methyl groups or fluorine substituents in the microcrystalline bulk material and the adsorbed species can be used to monitor the degree of adsorption. The results for various adsorption techniques, in particular dry adsorption by grinding mixtures of organic material and silica or by ball mill treatment of such mixtures are compared. Annealing and ball mill treatment was found to be most effective. Copyright © 1999 John Wiley & Sons, Ltd.