Interactions at the surface of organophilic-modified laponites a multinuclear solid-state NMR study

Interactions at the surface of organophilic-modified laponites : a multinuclear solid-state NMR study

Organically modified clays are largely employed in the preparation of nanostructured materials. The structural and dynamic characterization of the clay surface appears very important in the perspective of understanding the molecular mechanisms determining the improvement of the material properties....

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Veröffentlicht in:Langmuir : the ACS journal of surfaces and colloids. - 1992. - 23(2007), 7 vom: 27. März, Seite 3953-60
1. Verfasser: Borsacchi, Silvia (VerfasserIn)
Weitere Verfasser: Geppi, Marco, Ricci, Lucia, Ruggeri, Giacomo, Veracini, Carlo A
Format: Aufsatz
Sprache:English
Veröffentlicht: 2007
Zugriff auf das übergeordnete Werk:Langmuir : the ACS journal of surfaces and colloids
Schlagworte:Journal Article
Beschreibung
Zusammenfassung:Organically modified clays are largely employed in the preparation of nanostructured materials. The structural and dynamic characterization of the clay surface appears very important in the perspective of understanding the molecular mechanisms determining the improvement of the material properties. To this aim, in this work, a synthetic clay, Laponite, was studied in its untreated hydrophilic Na+-form, after ion exchange with alkylammonium cations and after subsequent grafting reaction with an alkoxysilane. These three samples were characterized by IR, SEM, TGA, and X-ray techniques and were deeply investigated by means of a wide combination of 29Si, 13C, and 1H high- and low-resolution solid-state NMR experiments. The grafting reaction with alkoxysilanes, occurring at the clay platelet edges, resulted in a reduction of the clay inter-platelet distances, and in an increased disorder in both the arrangement of the platelets and the conformational structure of the intercalated organic cation chains, probably due to the relative twisting of adjacent platelets
Beschreibung:Date Completed 15.05.2007
Date Revised 20.03.2007
published: Print-Electronic
Citation Status PubMed-not-MEDLINE
ISSN:1520-5827