Artículo
Marchi, M.C.; Castañeda-Guzmán, R.; Pérez-Pacheco, A.; Bilmes, S.A.; Villagrán-Muniz, M. "Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols" (2004) International Journal of Thermophysics. 25(2):491-502
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Abstract:
The use of correlation analysis of photoacoustic signal changes during the sol-gel-aging evolution of titania sols prepared from the hydrolysis of titanium n-butoxide in alcoholic, aqueous, and micellar media which provide different initial conditions and different evolution pathways is proposed. The photoacoustic experiments were done either at constant temperature for monitoring the initial evolution of the system, or under heating at 2°C·min -1 for monitoring molecular processes related to drying, sintering, and crystallization. Results obtained from photoacoustic measurements display higher sensibility when compared with those from differential thermal analysis (DTA) and thermogravimetric analysis (TGA). The evolution of these systems shows instabilities below and above gelation, as well as during thermal treatment. These stabilities are minimized when the thermal treatment is performed on gels aged several months, and can be associated to molecular rearrangements or oscillating chemical reactions. For all the systems studied, the sensitivity of the correlation analysis recovered from photoacoustic signals permits detection of a transition in the 100 to 150°C range.
Registro:
| Documento: | Artículo |
| Título: | Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols |
| Autor: | Marchi, M.C.; Castañeda-Guzmán, R.; Pérez-Pacheco, A.; Bilmes, S.A.; Villagrán-Muniz, M. |
| Filiación: | INQUIMAE-DQIAQF, Fac. de Ciencias Exactas y Naturales, Pabellón II, C1428EHA Buenos Aires, Argentina Photophysic Lab., Ctro. de Cie. Apl./Desarrollo Tecn., UNAM, A.P. 70-186, C.P. 04510, México D.F, Mexico |
| Palabras clave: | Correlation analysis; Oscillating reactions; Phase transition; Photoacoustic; Sol-gel; TiO 2; Ceramic materials; Crystallization; Gelation; Heat treatment; Hydrolysis; Phase transitions; Photoacoustic effect; Sintering; Thermoanalysis; Thermogravimetric analysis; Distinguishable transition; Gelation time; Oscillating reactions; Particle solvent interactions; Sol-gels |
| Año: | 2004 |
| Volumen: | 25 |
| Número: | 2 |
| Página de inicio: | 491 |
| Página de fin: | 502 |
| DOI: | http://dx.doi.org/10.1023/B:IJOT.0000028484.34967.1c |
| Título revista: | International Journal of Thermophysics |
| Título revista abreviado: | Int J Thermophys |
| ISSN: | 0195928X |
| CODEN: | IJTHD |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0195928X_v25_n2_p491_Marchi |
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Citas:
---------- APA ----------
Marchi, M.C., Castañeda-Guzmán, R., Pérez-Pacheco, A., Bilmes, S.A. & Villagrán-Muniz, M. (2004) . Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols. International Journal of Thermophysics, 25(2), 491-502.http://dx.doi.org/10.1023/B:IJOT.0000028484.34967.1c
---------- CHICAGO ----------
Marchi, M.C., Castañeda-Guzmán, R., Pérez-Pacheco, A., Bilmes, S.A., Villagrán-Muniz, M. "Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols" . International Journal of Thermophysics 25, no. 2 (2004) : 491-502.http://dx.doi.org/10.1023/B:IJOT.0000028484.34967.1c
---------- MLA ----------
Marchi, M.C., Castañeda-Guzmán, R., Pérez-Pacheco, A., Bilmes, S.A., Villagrán-Muniz, M. "Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols" . International Journal of Thermophysics, vol. 25, no. 2, 2004, pp. 491-502.http://dx.doi.org/10.1023/B:IJOT.0000028484.34967.1c
---------- VANCOUVER ----------
Marchi, M.C., Castañeda-Guzmán, R., Pérez-Pacheco, A., Bilmes, S.A., Villagrán-Muniz, M. Photoacoustic analysis of the evolution from sols to aged gels: Comparison of different initial titania sols. Int J Thermophys. 2004;25(2):491-502.http://dx.doi.org/10.1023/B:IJOT.0000028484.34967.1c
