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| Pàgina inicial > Articles > Articles publicats > Solid Materials with Tunable Reverse Photochromism |
(Institut Català de Nanociència i Nanotecnologia) (Institut Català de Nanociència i Nanotecnologia) (Universitat Autònoma de Barcelona. Departament de Química) (Institut Català de Nanociència i Nanotecnologia)| Data: | 2019 |
| Resum: | Herein, we report a novel, straightforward, and universal strategy to achieve solid materials with highly tunable reverse photochromism. This was accomplished by means of commercially available spiropyran dyes, which can produce different types of stable merocyanine states (i. e. , nonprotonated and protonated forms) displaying distinct reverse photochromic properties (i. e. , colors and coloration rates). To finely control the concentration ratio of these species and, as such, tailor the optical performance of the photochromes, we exploited their differential interaction with surrounding media of distinctive nature (i. e. , nonvolatile protic and aprotic polar solvents). In this way, solutions displaying different photochromic responses were prepared for individual spiropyrans without requiring chemical derivatization, an approach that can be generalized to other spiro dyes with distinct acid-base properties. To transfer this behavior to the solid state, core-shell capsules of these solutions were prepared, which were then used as ink materials for the fabrication of flexible polymeric films with unprecedented tunability of their photochromic properties that can be employed as rewritable multicolored devices. |
| Ajuts: | Ministerio de Economía y Competitividad MAT2015-70615-R Ministerio de Economía y Competitividad CTQ2015-65439-R Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-0465 Ministerio de Economía y Competitividad SEV-2017-0706 |
| Drets: | Tots els drets reservats.  |
| Llengua: | Anglès |
| Document: | Article ; recerca ; Versió acceptada per publicar |
| Matèria: | Reverse/negative photochromism ; Spiropyrans ; Merocyanine forms ; Microcapsules ; Rewritable devices |
| Publicat a: | ACS applied materials & interfaces, Vol. 11, Issue 12 (March 2019) , p. 11884-11892, ISSN 1944-8252 |
12 p, 1.0 MB |
