Mesoporous silica materials have been synthesised in strongly acidic media at pH = 1.3 using high concentrations of a non-ionic surfactant (Brij 76) as a structure-directing agent. Well-defined ordered mesoporous silicas with hexagonal (HI), lamellar (L∞) and solid phase (S) structure have been prepared at room temperature according to the lyotropic liquid crystalline mesophases of Brij 76. At high temperature (60°C), highly ordered cubic (Ia3d), cubic (Im3m) and 3-d hexagonal (p63/mmc) nanostructured materials have been produced. The synthesised materials were studied by powder X-ray diffraction (XRD), the Brunauer-Emmett-Teller (BET) method for nitrogen adsorption/desorption isotherms and surface area measurements. Transmission electron microscopy (TEM), XRD and TEM patterns for all materials show well-defined long-range porous architectures. It was found that BET surface area values of the nanostructured materials are reduced upon increasing the temperature of synthesis.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Materials Chemistry
- Materials Science(all)