Abstract
Alkylammonium phyllosilicate hybrids were synthesized hydrothermally from mixtures of Mg(OH) 2, LiF and Si-containing reagents without using any layered silicates. Octadecyldimethyl(3-trimethoxysilylpropyl)ammonium chloride, silica sol and tetraethoxysilane (TEOS) were used as silica sources. A formation of a covalent bonding between an inorganic moiety and an organic moiety and a formation of a layered structure took place simultaneously in one pot. The structure of the hybrids was revealed by means of elemental analysis, X-ray diffraction (XRD), transmission electron microscope (TEM), electron diffraction (ED), high-resolution solid-state nuclear magnetic resonance (NMR) and infrared (IR). The inorganic moiety of the hybrids is a magnesium phyllosilicate analogous to Mg-trioctahedral smectites. The organic moiety is analogous to alkylammonium (C 18H 37N +(CH 3) 2C 3H 6–) and exists between layers of the inorganic moiety, being combined with the inorganic moiety through Si–C covalent bonds. Furthermore, solid-state 29Si NMR and XRD revealed that there are some defects in the inorganic moiety because of substitution of CSiO 3 for the Si tetrahedral site. The lateral dimension of the inorganic moiety is closer to that of an Mg-trioctahedral sheet in a free state as the organic/inorganic ratio is higher.
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