A two-step route to synthesis of small-pored and thick-walled SBA-16-type mesoporous silica under mildly acidic conditions

Synthesis,Mechanisms and Different Applications of Mesoporous Materials Based on Silica and Alumina

“…However, according to Steel et al (43) silicate precursors directed the surfactant molecules into hexagonal LC phase. This result was supported by 14 N NMR spectroscopy study. It was postulated that, the silicate precursors were present as organized layers in between the rows of the cylindrical miceller rods.…”

“…This was postulated as a cooperative self assembly of ammonium surfactants and silicate precursors below CMC. (42) investigated in situ 14 N NMR spectroscopy study of synthesis of MCM-41 under the same synthetic conditions reported by Mobil scientists and the results confirmed that LC did not form during MCM-41 synthesis. They proposed that, silicate deposition occurred on the surfactant micelle rods which were randomly arranged, followed by ordering of silicate deposited rods into hexagonal mesostructures.…”

“…Jin et al (14) reported a two-step method for synthesis of well-ordered SBA-15-type and SBA-16-type mesoporous silica materials under mildly acidic conditions by separating the hydrolysis and the condensation steps of the silica source in a controlled pH range higher than the isoelectric point of silica (pH [2][3][4][5]. It is known that the fluoride ion can serve as a powerful promoter for hydrolytic condensation of alkoxysilanes, such as TEOS, in aqueous media containing amphiphilic surfactants and thus give thermally and hydrothermally stable mesoporous silica.…”

Nanostructured silica templated by double hydrophilic block copolymers with a comb-like architecture

“…The synthesis of the hybrid materials using the structuring complex systems occurs in two steps [36,37]. First the PAA-b-PAMPEO and the OCL are dissolved in an aqueous solution; TEOS is then added, leading to a diphasic system and the pH is adjusted at a value of 2 for TEOS hydrolysis.…”

A Simple and Rapid Method to Directly Synthesize TiO2/SBA-16 with Different TiO2 Loading and its Photocatalytic Degradation Performance on Rhodamine B

“…The synthesis is done at acidic conditions which almost make all metal salts soluble and lost during the filtration process. So a very small amount of TiO 2 can be incorporated into the framework of SBA- 16 and few researches about the properties and performance of TiO 2 /SBA-16 were reported. Thus, it requires new appropriate synthesis approach which can provide an effective way to control the uniformity of TiO 2 particle size and induce controlled TiO 2 particle growth.…”