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Mesostructured self-assembled silica films with reversible thermo-photochromic properties

Malfatti, Luca and Costacurta, Stefano and Kidchob, Tongjit and Innocenzi, Plinio and Casula, Maria Francesca and Amenitsch, Heinz and Dattilo, Davide and Maggini, Michele (2009) Mesostructured self-assembled silica films with reversible thermo-photochromic properties. Microporous and Mesoporous Materials, Vol. 120 (3), p. 375-380. ISSN 1387-1811. Article.

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DOI: 10.1016/j.micromeso.2008.12.004

Abstract

A spiropyran molecule has been introduced via one-pot synthesis into mesostructured silica films, which have been obtained through a micelle templating self-assembling process. The mesostructure has been characterized by transmission electron microscopy and small-angle X-ray scattering performed with synchrotron light. The final material exhibited a p6mm 2d-hexagonal organization and the mesostructure has not been affected by the introduction of spiropyrans in the precursor solution. A comparative characterization of the optical properties of the spiropyrans dissolved in different solvents and after incorporation in the mesostructured films has been done by UV–Vis absorption spectroscopy, fluorescence spectroscopy and ellipsometric spectroscopy. The spiropyran-doped films appeared transparent before external stimuli had applied, a colour change to yellow (thermally induced) or to red (light induced) has been observed. Both the colour changes have been observed to be reversible under room temperature or visible light exposure; the colour transitions have been attributed to different equilibria among the various forms of merocyanine of spiropyrans.

Item Type:Article
ID Code:2482
Status:Published
Refereed:Yes
Uncontrolled Keywords:Self-assembly, mesostructured films, nanocomposites, spiropyrans, photochromism
Subjects:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/22 Scienza e tecnologia dei materiali
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01 Dipartimenti > Architettura e pianificazione
Publisher:Elsevier Science
ISSN:1387-1811
Deposited On:18 Aug 2009 10:07

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