A FT-IR Study of the Hydrolysis of Tetraethylorthosilicate (TEOS). |
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| Authors: | F. Rubio J. Rubio J. L. Oteo |
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| Affiliation: | Instituto de Cerámica y Vidrio, (C.S.I.C.) , Ctra Valencia, Km 24,300. 28500 Arganda del Rey, Madrid, Spain Phone: +34-1-8.71.18.00 Fax: +34-1-8.71.18.00 E-mail: frubio@icv.csic.es |
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| Abstract: | Abstract The hydrolysis and polymerization of a non-catalyzed silica sol was investigated by Fourier Transform Infrared Spectroscopy (FT-IR) and deconvolution of the infrared spectra. The hydrolysis was followed by the 1168 and 812 cm?1 bands which have been observed that decrease continously with the reaction time, and they dissapear showing the complete hydrolysis. The bands located at 1200 and 1147 cm?1 are assigned to polymerization of Si-OH groups forming Si-O-Si bonds in cyclic or linear structures respectively. Both bands increase with time and are present simultaneously in the spectra showing that both kind of cross-linking of Si-OH groups are taking place in the sol to form the gel. In the gel the presence of Si-OH groups and Si-O? free broken bonds have been detected by means of the bonds located at 960 and 920 cm?1 respectively. |
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| Keywords: | Infrared Spectroscopy Sol-Gel Deconvolution Time Evolution |
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