Clays and Clay Minerals, Vol. 57, No. 5, 638–648, 2009.
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Authors
Letaief, Sadok
Detellier, Christian
Issue Date
2009
Type
Article
Language
Keywords
Periodicals , Geology , Alkylammonium , Choline , Aluminosilicate , Clay Mineral , Grafting , Intercalation , Ionic Liquids , Kaolinite , Layered Materials , Nanohybrid Materials , Organo-clay
Alternative Title
Functionalization Of The Interlayer Surfaces Of Kaolinite By alkylammonium Groups From Ionic Liquids
Abstract
The objective of this studywas to design new, functional, nanostructured materials from the abundant claymineral kaolinite, in spite of development problems with the interlayer chemistry of kaolinite because of its non-swelling properties. A particular goal of this work was to graft, in a controlled way, alkylammonium groups onto the aluminol interlayer surfaces of kaolinite. This was successfully achieved bysoft-chemic al approaches, more specificallybythe melting intercalation process of alkylammonium ionic liquids which were synthesized for this purpose. The resulting nanohybrid materials were characterized chemicallyand structurally byX-ray diffraction analysis, thermal analysis (TG/DTA), 13C cross polarization magic angle spinning nuclear magnetic resonance spectroscopy, and Fouriertransform infrared spectroscopy. The amount of grafted organic material was quantified from TGA results. Alkylammonium salts with a short alkyl chain were grafted directly using a melting reaction at 180ºC under N2 involving the in situ displacement of dimethylsulfoxide (DMSO) from a DMSO-kaolinite preintercalate; for longer alkyl chains, the grafting was done in two steps. In the first step, the corresponding amino-alcohol was grafted into the kaolinite bydisplacement of DMSO from the interlayer space. The second step consisted of quaternarization of the grafted material byrea ction with iodomethane or iodoethane.
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Citation
Clays and Clay Minerals, Vol. 57, No. 5, 638–648, 2009.
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