Issue 6, 2005
From the journal:

Journal of Materials Chemistry

The influence of sol–gel processing parameters on the photochromic spectral and dynamic behaviour of a naphthopyran dye in an ormosil coating

Rosario Pardo,a   Marcos Zayata  and  David Levy*a  

* Corresponding authors

a Instituto de Ciencia de Materiales de Madrid, C.S.I.C., 28049 Cantoblanco, Madrid, Spain
E-mail: d.levy@icmm.csic.es
Fax: +34 913 720 623

Abstract

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 µm 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.

Graphical abstract: The influence of sol–gel processing parameters on the photochromic spectral and dynamic behaviour of a naphthopyran dye in an ormosil coating

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Article information

DOI
https://doi.org/10.1039/B415156A
Article type
Paper
Submitted
30 Sep 2004
Accepted
03 Nov 2004
First published
25 Nov 2004

J. Mater. Chem., 2005,15, 703-708

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The influence of sol–gel processing parameters on the photochromic spectral and dynamic behaviour of a naphthopyran dye in an ormosil coating

R. Pardo, M. Zayat and D. Levy, J. Mater. Chem., 2005, 15, 703 DOI: 10.1039/B415156A

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