Interlamellar silylation of magadiite by octyl triethoxysilane in the presence of dodecylamine

Abstract

Magadiite was modified by interlamellar silylation with octyl triethoxysilane (OTES) in the presence of doclecylamine (DDA) in ethanol without a pre-swelling step. Dodecylamine expanded the interlayer space and acted as silylation catalyst. The well ordered silylated magadiite had basal spacings between 1.18 and 1.38 nm. Solid-state Si-29 MAS NMR showed Q(3) and Q(4) signals as well as T-2 and T-3 signals. The increase in the relative intensity of W for W and the appearance of T-2 and T-3 signals were attributed to the grafting of OTES to the interlayer surface silanol groups. The described method provides a promising route for the preparation of functional nanomaterials. (C) 2009 Elsevier B.V. All rights reserved.