Synthesis and Characterization of Mesostructured Titania-Based Materials through Evaporation-Induced Self-Assembly

GALO JUAN DE AVILA ARTURO SOLER ILLIA; LOUIS, A.; SANCHEZ, C.

CHEMISTRY OF MATERIALS

Lugar: ACS; Año: 2002 vol. 14 p. 750 - 759

0897-4756

Mesostructured TiO2-hexadecyltrimethylammonium bromide hybrid powders, displaying a bidimensional hexagonal pattern (p6m), have been synthesized by an evaporation-induced self-assembly (EISA) method, in ethanol/HCl/H2O media. Thermal treatment of these ?titaniatropic? hybrid phases leads to phosphorus-free, high surface area (280-370 m2 g-1) mesoporous titania, with 20-25 Å pores. The role of the synthesis parameters (surfactant and acid concentrations and temperature) is thoroughly discussed to understand their influence on the hybrid mesostructures. It is suggested that hydrophilic Ti-oxo nanometric building blocks formed in the acidic synthesis conditions self-assembly upon solvent evaporation to produce organized structures.2-hexadecyltrimethylammonium bromide hybrid powders, displaying a bidimensional hexagonal pattern (p6m), have been synthesized by an evaporation-induced self-assembly (EISA) method, in ethanol/HCl/H2O media. Thermal treatment of these ?titaniatropic? hybrid phases leads to phosphorus-free, high surface area (280-370 m2 g-1) mesoporous titania, with 20-25 Å pores. The role of the synthesis parameters (surfactant and acid concentrations and temperature) is thoroughly discussed to understand their influence on the hybrid mesostructures. It is suggested that hydrophilic Ti-oxo nanometric building blocks formed in the acidic synthesis conditions self-assembly upon solvent evaporation to produce organized structures.