1.LSS, Instituto de Química – UFRGS, CP 15003, 91501-970 Porto Alegre, RS, Brazil,;2.Instituto de Química, Unicamp, CP 6154, 13083-970 Campinas, SP, Brazil,
Abstract:
Anilinepropylsilica xerogel was obtained by using an appropriate organosilane and tetraethyl orthosilicate as precursor reagents. The gelation was carried out using HF and NaF as catalysts. The presence of Na+ (when NaF was used) resulted in a decrease in the final organic content of the materials. This effect was interpreted as an inhibition of the organosilane polycondensation possibly due to the Na+ interaction with the SiO- groups of the hydrolyzed organosilane. The presence of Na+ also results in morphological changes in the xerogels.