KAOLINITE-DIMETHYLSULFOXIDE NANOCOMPOSITE PRECURSORS

摘要

Lamellar kaolinite matrices were subjected to intercalation reactions using dimethylsulfoxide (DMSO) as the intercalating agent. The nanocomposites, kaolinite-DMSO (K-DMSO), were obtained by two distinct routes while the DMSO:H_2O (9 percent v/v) ratio was kept constant. Aliquots were removed periodically to evaluate the evolution of the intercalation of the DMSO molecules in the kaolinite lamellae, using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and thermogravimetric analysis (TGA). The results indicated that the modification of the methodology normally used for DMSO intercalation in kaolinite led to a significant reduction in the time required for intercalation (from 480 h to 5 h) and that the synthesis carried out at 95-l00 deg C produced samples with an 87 percent intercalation rate.