Aniline Polymerization into Channels and Cavities of Na-Al-SBA-3 and Na-Al-Sba-16 Mesoporous Materials.

MARÍA L. MARTÍNEZ; MARCOS GOMEZ COSTA; ANDREA R.BELTRAMONE; OSCAR A. ANUNZIATA

Singapur

Conferencia; 1st NanoToday Conference; 2009

NanoToday

The news aluminosilicates materials, Na-Al-SBA-3 and Na-Al-SBA-16 were synthesized, with aim to apply in the preparation of nano-composites. The novel Na-Al-SBA-3 mesoporous material development by us is the first report (we have not find information reported in bibliographies about this material). These materials were obtained implying a sol–gel method. After template extraction and calcinations (823 K), two solids, Na-Al-SBA-3 and Na-Al-SBA-16, were obtained. The presence of Na+ cations in the structure of SBA-3 and SBA-16 is a prerequisite for aniline adsorption and aniline in situ polymerization. The developed technique was effective for the synthesis; the sharpness of each of these XRD signals and their hkl index indicates, the regularity of the hexagonal array of cylindrical pores in the Na-Al-SBA-3 whereas the Na-Al-SBA-16 presents the cubic Im3m symmetry of it structure,  which we use as hosts. They materials were exposed to equilibrium vapours from liquid aniline to obtain aniline saturated hosts [1]. By means of infrared spectroscopy, we could observe that aniline is absorbed in great proportion onto Na-Al-SBA-3 through the p electron system with electron acceptors sites of these materials, like the Na+ cation and SiOH groups. The aniline adsorption onto Na-Al-SBA-16 is given through both, the p electron system and the amine group. Mesoporous polyaniline/SBA-3 and polyaniline/SBA-16 composites were prepared and their physical properties were investigated. The polyaniline (PANI) was polymerized inside the pores of the mesoporous material by a post-synthesis process. The composites obtained by an in-situ polymerization technique, has been characterized by infrared spectroscopy. The characteristic PANI bands are present in spectrums obtained by FTIR. The PANI/Na-Al-SBA-16 composite posses the mayor amount of emeraldine salt (Stretching [quinoid/ benzene ring] = 0.56) whereas PANI/Na-Al-SBA-3 composite have a similar relation with respect to published data. [1] O.Anunziata, M.Gómez Costa, L.Martínez. Catalysis Today 133–135 (2008) 897–905