Synthesis and Characterization of Si-Al, Si-Ti, Si-Zr, Al-Zr, Al-Ti, and Al-Ti-Zr Nanocomposites of Lamellar or Hexagonal Structure

摘要

By using tetraethylortosilicate, titanium and zirconium tetrabutoxide, and aluminum sec-butoxide, as well as neutral 1,10 and 1,12 alkyldiamines or dodecyltrimethylammonium bromide as precursors, a series of six oxides, Si-Al, Si-Ti, Si-Zr, Al-Zr, Al-Ti, and Al-Ti-Zr, were obtained. These materials were characterized by infrared spectroscopy, thermogravimetry, X-ray diffraction patterns, and scanning electron microscopy. Si-Ti, Si-Zr, and Al-Ti matrices exhibit a lamellar structure, whereas the others have a hexagonal nature. With the exception of the Al-Ti matrix for which grains with spheric morphology are observed, all the other matrices exhibited grains with amorphous nature, as observed by SEM micrographs.