The influence of sol–gel processing parameters on the photochromic spectral and dynamic behaviour of a naphthopyran dye in an ormosil coating
-
1.
Instituto de Ciencia de Materiales de Madrid
Description
A photochromic naphthopyran derivative was embedded in a Ph-modified ormosil coating. Important changes in the photochromic properties of the films were induced by modifications in the preparation parameters of the sol–gel processing, such as the hydrolysis and condensation of the sols, the photochromic-dye loading in the film and the curing of the samples after deposition. In this way, it is possible to control the thickness of the resulting coatings, their absorption spectra after irradiation and the kinetics of thermal bleaching. The coatings were prepared having a thickness in the 0.8–2.1 mm range, allowing the incorporation of large amounts of dye in the matrix (up to a dye/Si molar ratio of 0.02) and showing a coloration change upon irradiation with UV-light in the ΔOD 0.04–0.22 range.
Files
2-Pardo-Zayat-Levy2_JMC_2005.pdf
Files
(979.6 kB)
| Name | Size | Download all |
|---|---|---|
|
md5:964e63494d752863fa433543370d9158
|
979.6 kB | Preview Download |
Additional details
Identifiers
- Handle
- 10261/343403
Dates
- Accepted
-
2004-11-25
References
- 1 C. J. Brinker and G. W. Sherer, Sol–Gel Science: The Physics and Chemistry of Sol–Gel Processing, Academic Press, San Diego, 1990. 2 D. Levy and L. Esquivias, Adv. Mater., 1995, 7, 120. 3 G. Philipp and H. Schmidt, J. Non-Cryst. Solids, 1984, 63, 283. 4 D. Levy and D. Avnir, J. Phys. Chem., 1988, 92, 4734. 5 D. Levy, S. Einhorn and D. Avnir, J. Non-Cryst. Solids, 1989, 113, 137. 6 B. Van Gemert, in Organic Photochromic and Thermochromic Compounds, ed. J. C. Crano and R. Guglielmetti, Plenum Press, New York, 1999, vol. 1, ch. 3. 7 A. Kumar, Mol. Cryst. Liq. Cryst., 1997, 297, 139. 8 B. Luccioni-Houze´, M. Campredon, R. Guglielmetti and G. Giusti, Mol. Cryst. Liq. Cryst., 1997, 297, 161. 9 D. B. Knowles, US Pat., 1993, 5238981. 10 A. Kumar, B. Van Gemert and D. B. Knowles, US Pat., 1995, 5458814. 11 C. M. Nelson, A. Chopra, D. B. Knowles, B. Van Gemert and A. Kumar, US Pat., 2002, 6348604. 12 M. Zayat and D. Levy, J. Mater. Chem., 2003, 13, 727. 13 C. Rottman, G. Grader and D. Avnir, Chem. Mater., 2001, 13, 3631. 14 M. Zayat, R. Pardo and D. Levy, J. Mater. Chem., 2003, 13, 2899. 15 U. Schubert, N. Hu¨ sing and A. Lorenz, Chem. Mater., 1995, 7, 2010.