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Bending Induced Self-Organized Switchable Gratings on Polymeric Substrates


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Opened Access Bending Induced Self-Organized Switchable Gratings on Polymeric Substrates

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Author: Parra Barranco, Julián
Oliva Ramirez, Manuel
Gonzalez García, Lola
Alcaire Martín, María
Macías Montero, Manuel
Borrás Martos, Ana Isabel
Frutos Rayego, Fabián
González-Elipe, Agustín R.
Barranco Quero, Ángel
Department: Universidad de Sevilla. Departamento de Física Aplicada I
Date: 2014
Published in: ACS Applied Materials and Interfaces, (6), 11924-11931
Document type: Article
Abstract: We present a straightforward procedure of self-surface patterning with potential applications as large area gratings, invisible labeling, optomechanical transducers, or smart windows. The methodology is based in the formation of parallel micrometric crack patterns when polydimethylsiloxane foils coated with tilted nanocolumnar SiO2 thin films are manually bent. The SiO2 thin films are grown by glancing angle deposition at room temperature. The results indicate that crack spacing is controlled by the film nanostructure independently of the film thickness and bending curvature. They also show that the in-plane microstructural anisotropy of the SiO2 films due to column association perpendicular to the growth direction determines the anisotropic formation of parallel cracks along two main axes. These self-organized patterned foils are completely transparent and work as customized reversible diffraction gratings under mechanical activation.
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