Neutralization-mediated extraction of amphiphilic organic molecules for obtaining high-quality mesoporous alumina

Abstract

A solvent extraction method was improved by using organic bases such as triethylamine (Et3N) that neutralize HCl effectively and stabilize sol-gel derivative alumina frameworks as insoluble species, thereby achieving a...

Smart synthesis of highly porous metal oxide powders with the self-assembly of amphiphilic organic compounds

“…Starting with the synthetic conditions for a high-quality mesoporous alumina (Al 2 O 3 ) film, 22,23 we were able to recover mesoporous Al 2 O 3 powders using a general-purpose spray-dryer. The porosity of the resultant powders (spray dried at 170 °C, pore size; 4.7 nm, specific surface area; 278 m 2 g −1 , pore volume; 0.53 cm 3 g −1 , amorphous after calcination at 400 °C) 32–34 seemed enough in comparison to others prepared by applying the spray-drying process (pore size: 4.6 nm; specific surface area: 142 m 2 g −1 ; pore volume: 0.14 cm 3 g −1 ; amorphous after calcination at 500 °C; pore size: 4.1 nm; specific surface area: 112 m 2 g −1 ; pore volume: 0.08 cm 3 g −1 ; and partially γ-phase after calcination at 800 °C). 30…”

“…28,31 Small-sized mesoporous structures have hardly been found among those prepared by applying the spray-drying EISA process. 29,30,32–42 The thick frameworks are helpful for the successful crystallization of the metal oxide frameworks surrounding medium- and large-sized mesopores and/or macropores.…”

“…35 However, the synthetic conditions, including the chemical composition of a precursor solution, were optimized with lots of working time. Similar to the aerosol-assisted synthesis of mesoporous Al 2 O 3 powders, 32–34 we may have another possibility starting from the chemical composition of a precursor solution optimized for fabricating a high-quality mesoporous TiO 2 film. 20,21…”