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A multinuclear solid‐state magnetic resonance study of the interactions between the inorganic and organic coatings of BaSO 4 submicronic particles
Author(s) -
Borsacchi S.,
Geppi M.,
Veracini C. A.,
Lazzeri A.,
Di Cuia F.,
Geloni C.
Publication year - 2008
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/mrc.2131
Subject(s) - chemistry , stearic acid , carboxylate , covalent bond , magic angle spinning , monolayer , adsorption , hydrogen bond , carboxylic acid , coating , chemical engineering , polymer chemistry , crystallography , organic chemistry , molecule , nuclear magnetic resonance spectroscopy , engineering , biochemistry
Silica‐coated BaSO 4 submicronic particles, modified on the surface by treatment with stearic acid, have been characterized by means of 29 Si, 13 C, and 1 H magic‐angle‐spinning (MAS) high‐resolution techniques, and low‐resolution 1 H‐FID analysis. Two types of adsorbed water were identified; adsorbed either inside or on the surface of BaSO 4 , most of the latter being removed by the silica coating. Evidences of silica–stearic acid interactions were found involving either carboxylic acid or carboxylate functional groups, and occurring by means of hydrogen and/or covalent bonds. Stearic acid was present as monolayer only, its chain being mostly rigid, even though a small fraction was subjected to fast inter‐conformational motions. Copyright © 2008 John Wiley & Sons, Ltd.