Abstract
Infrared spectroscopy has been used to analyze the structural changes in samples prepared by the sol-gel method. Silica gels were prepared from alcoholic solutions of tetraethylorthosilicate (TEOS) with different H2O/TEOS molar ratios. The IR spectra of these gels, in the Si–O bond stretching region, shows that their structure strongly depends on the H2O/TEOS ratio. The relative change in intensity of the Si–O stretching modes, in samples prepared using different H2O/TEOS ratios, are interpreted in terms of different degrees of structural disorder. According to our infrared absorption data, a decrease in the H2O/TEOS ratio from about 7, the SiO2 structure evolves from a three-dimensional network toward a chainlike structure.
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Dates
Type | When |
---|---|
Created | 23 years, 1 month ago (July 26, 2002, 8:16 a.m.) |
Deposited | 1 year, 6 months ago (Feb. 10, 2024, 3:25 p.m.) |
Indexed | 1 month, 3 weeks ago (July 7, 2025, 9:06 a.m.) |
Issued | 26 years, 10 months ago (Nov. 1, 1998) |
Published | 26 years, 10 months ago (Nov. 1, 1998) |
Published Print | 26 years, 10 months ago (Nov. 1, 1998) |
@article{Mart_nez_1998, title={Infrared spectroscopy analysis of the local atomic structure in silica prepared by sol-gel}, volume={109}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.477374}, DOI={10.1063/1.477374}, number={17}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Martı́nez, J. R. and Ruiz, F. and Vorobiev, Y. V. and Pérez-Robles, F. and González-Hernández, J.}, year={1998}, month=nov, pages={7511–7514} }