Gas permeation properties of porous glass modified with LB films of alkylalkoxysilane derivatives

The surface of porous glass with average pore diameter of 40 إ could be covered successfully with polymeric, pinhole-free LB films of dialkylalkoxysilane derivative. The gas permeability of porous glass decreased with increasing the number of deposited LB layers and was regulated by the phase-transition of the LB film. The air-calcination at 500°C of the porous glass, which was modified with 200-layer LB film, resulted in narrowing the pore opening size as a result of the formation of a silica overlayer.