A multinuclear solid-state magnetic resonance study of the interactions between the inorganic and organic coatings of BaSO4 submicronic particles

✍ Scribed by S. Borsacchi; M. Geppi; C. A. Veracini; A. Lazzeri; F. Di Cuia; C. Geloni

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 182 KB
• Volume: 46
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.2131

✦ Synopsis

Abstract

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.