Resumo

MARTINEZ, J.R.  e  RUIZ, F.. Mapeo estructural de sílica xerogel utilizando espectroscopía infrarroja. Rev. mex. fis. [online]. 2002, vol.48, n.2, pp.142-149. ISSN 0035-001X.

Infrared spectroscopy has been used to analyse structural changes in samples prepared by the sol-gel method. Silica xerogels powders were prepared from tetraethylorthosilicate (TEOS), distilled water, and ethanol with different H₂O/TEOS molar ratios. A low water to TEOS molar ratio gives a incomplete hydrolysis of the TEOS molecules and yielding to oligomeric structures, whereas a high water to TEOS molar ratio yield to a full hydrolyzation faciliting the cross-linking of polymeric chains and producing a three-dimensional interconnection of siloxanes.

Palavras-chave : Sol-gel; silicate glasses; structure; infrared spectroscopy.

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