Synthesis of Titania-Silica Materials by Sol-Gel

• Published in: Materials research (São Carlos, São Paulo, Brazil) Vol. 5; no. 4; pp. 497 - 502
• Main Authors: Lenza, Rubia F. S., Vasconcelos, Wander L.
• Format: Journal Article
• Language: English
• Published: ABM, ABC, ABPol 01-10-2002; Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
• Subjects: ENGINEERING, CHEMICAL; MATERIALS SCIENCE, MULTIDISCIPLINARY; METALLURGY & METALLURGICAL ENGINEERING; sol-gel; synthesis; TiO2-SiO2; synthesis; TiO2-SiO2; sol-gel
• ISSN: 1516-1439; 1980-5373; 1516-1439
• DOI: 10.1590/S1516-14392002000400017

TiO2-SiO2 glasses containing as much as 20 mol% of TiO2 were prepared via a sol-gel process using titanium and silicon alkoxides in the presence of chlorine in the form of titanium tetrachloride or HCl. The gels were heat-treated to 800 C. XRD and FTIR spectroscopy were used to understand the structural properties of TiO2-SiO2 oxides calcined at different temperatures and to evaluate the homogeneity of these materials. The degree of compactness of the silica network was inferred from the frequency of the asymmetric stretching vibrations of Si-O-Si bonds. Formation of Si-O-Ti bridges, as monitored by the intensity of characteristic 945 cm-1-960 cm-1 vibration, was particularly prominent if the method of basic two-step prehydrolysis of silicon alkoxide, addition of titanium alkoxide and completion of hydrolysis was used. 16 refs.