Facile synthesis of hydrophobic microporous silica membranes and their resistance to humid atmosphere

In situ generated silica nanoparticles as pore-forming agent for enhanced permeability of cellulose acetate membranes

“…layer of the formed membrane. Furthermore, the SiO 2 nanoparticles showed high hydrophilicity due to the presence of great deal of hydroxyl groups [31,32], which may finally drive the majority of generated nanoparticles to transfer from the skin layer into the coagulation bath. The above phenomenon could be proved by TGA measurements (in Section 3.1).…”

Influence of sol–gel conditioning on the cobalt phase and the hydrothermal stability of cobalt oxide silica membranes

“…Several strategies have been employed to improve the hydrothermal stability of silica membranes, including templating [12,13] and hybrid organosilica [14][15][16]. However, these materials can only be operational at moderate temperatures (o300-400 1C) because of the degradation of the organic species present in the silica films.…”

Facile synthesis of zirconia doped hybrid organic inorganic silica membranes

“…On the other hand sol-gel derived silica membranes are known for their excellent H 2 /CO 2 selectivity, but degrade in a hydrothermal environment due to the mobility of the silanol groups in the material [6,7]. Strategies to increase the hydrothermal stability of silica are doping silica with metal oxides to stabilize the siloxane bonds [6,[8][9][10][11] or by using a hydrophobic compound to prevent water sorption onto or into the material [12][13][14]. The latter approach is used in hybrid silica membranes based on bridged silsesquioxanes like bis(triethoxysilyl)ethane (BTESE).…”