Triblock copolymer-templated large-pore

In this paper, we report the synthesis of mesoporous silica and alumina spheres with nanometer size (80 to 900 nm) in the present of organic solvent with aqueous ammonia as the morphological catalyst to control the hydrolysis of tetraethyl orthosilicate (TEOS) and aluminum tri-sec-butoxide.1181 Mesoporous silica spheres show hexagonal arranged pores with monodispersed pore sizes ( 2.4 nm) and high surface areas ( 1020 m2/g) similar to MCM-41. A large pore ( 10 nm) mesoporous alumina sphere templated by triblock copolymer is thermally stable. Calcined alumina sphere shows disordered mesoporous arrays with relatively uniformed pore size distribution and high surface areas ( 360 m2/g). 

In summary, nanometer-sized mesoporous silica and alumina spheres with tunable diameters (80 - 900 nm) can be synthesized in organic solvent. Mesoporous silica spheres templated by cationic surfactant (CTAB) have hexagonal array with monodispersed pore size (-2.4 nm), high surface areas (-1020 m2/g), and pore volume (1.02 cm3/g). Mesoporous alumina spheres templated by amphiphilic triblock copolymer show a large disordered mesopore (10.0 nm) and high BET surface area (360 m2/g). 

Very recently, mesoporous Ti02 with anatase, rutile, bicrystalline mixture (anatase and rutile) with controlled phase composition, and tricrystalline mixture (anatase, rutile, and brookite) were reported by using triblock copolymer as template and TiCLi as precursor. The resulting crystalline titanias are thermally stable and have high surface area and large pore size up to 16 run. 

At nearly the same time as the report of PMO synthesized by CTAB, PMOs with large pores of 6.0-7.4 nm in diameter were synthesized using a triblock copolymer as template. Caber and coworkers [67] reported a PMO that was synthesized by the acid-catalyzed hydrolysis and condensation of bis-(triethoxysilyl)ethane (BTSE) using the triblock copolymer Pluronic P123 as the SDA. Another report deals with... 

---