Spectroscopic study of SiO2−TiO2 sols prepared using stabilizing agents

Two chemical routes were employed to prepare Si−Ti polymers, using acetylacetone (acacH) and acetic acid (HOAc) as modifying agents. The homogeneous and transparent sols were studied at different aging times. The characterization techniques were29Si NMR, FTIR, UV-Vis and TGA. When HOAc was used, the...

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Bibliographic Details
Published inJournal of sol-gel science and technology Vol. 8; no. 1-3; pp. 235 - 241
Main Authors Méndez-vivar, J., Mendoza-Serna, R., Gómez-Lara, J., Gaviño, R.
Format Journal Article
LanguageEnglish
Published New York Springer Nature B.V 01.02.1997
Subjects
Acetic acid
Acetylacetone
NMR
Nuclear magnetic resonance
Organic chemistry
Silicon dioxide
Titanium dioxide
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Summary:Two chemical routes were employed to prepare Si−Ti polymers, using acetylacetone (acacH) and acetic acid (HOAc) as modifying agents. The homogeneous and transparent sols were studied at different aging times. The characterization techniques were29Si NMR, FTIR, UV-Vis and TGA. When HOAc was used, the oligomeric species in the first stages of polymerization were assigned by29 Si NMR. The Ti−O−Si bond vibration was detected by FTIR in the 950–960 cm−1 region. UV-Vis spectroscopy showed bands of acac bonded to Ti at 300 nm and 365 nm, and OAc− bonded to Ti was found at 320 nm. The TGA study allowed the establishment of the xerogel formulas.
ISSN:0928-0707
1573-4846
DOI:10.1007/BF02436846