The intercalation of cetyltrimethylammonium cations into muscovite by a two-step process: II. The intercalation of cetyltrimethylammonium cations into Li-muscovite

The alkylammonium cations were successively intercalated into the interlayer of muscovite. It was achieved by inorganic-organic ion exchange in the hydrothermal reaction of the LiNO3-treated muskovite with cctyltrimethylammonium bromide solution. One-dimensional Patterson plots and electron density calculations show that hydrated Li+ and CTA(+) cations entered the interlayer of muscovite successively. The CTA(+)-intercalated muscovite was characterized by powder X-ray diffraction and elemental analysis. in conjunction with FTIR. nuclear Magnetic resonance, X-ray photoelectron spectra, high-resolution transmission electron microscopy, etc. The experiments show that organo-muscovite composite With ordered structure has been obtained. The CTA(+) headgroups are distributed ill the interlayer uniformly. However, the arrangement and conformation of CTA(+) chains are strongly dependent upon the reaction temperature. At lower reaction temperature the chains of CTA(+) ions adopt a little more disordered arrangement and have higher gauche trans Conformer ratio, resulting in the disturbance to the interlayer symmetry. Whereas at higher reaction temperature, the sample with paraffin-like arrangement of CTA(+) chains could be obtained, in which the methylene chains of CTA(+) adopt a fully Stretched. all-trans conformation. (C) 2006 Elsevier Inc. All rights reserved.