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Solid materials with tunable reverse photochromism
摘要： Herein we report on 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. non-protonated and protonated forms) displaying distinct reverse photochromic properties (i.e. colours and colouration 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. non-volatile 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 behaviour 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 multi-coloured devices.
关键词： rewritable devices,merocyanine forms,reverse/negative photochromism,spiropyrans,microcapsules
更新于2025-11-19 16:56:35
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Hydrophilic Internal Pore and Hydrophobic Particle Surface of Organically Modified Mesoporous Silica Particle to Host Photochromic Molecules
摘要： The external surface of a mesoporous silica, MCM-41, was functionalized with phenyl group to obtain dual domain mesoporous silica particle (hydrophobic particle surface and hydrophilic mesopore) for photochrmoism of merocyanine/spiropyran. Merocyanine was adsorbed on MCM-41 and that functionalized with phenyl group by the photoinduced adsorption. The red hybrid of Ph-MCM-41 showed negative photochromism with a higher decolorization efficiency and a faster thermal colorization than the hybrid of MCM-41, suggesting the photogenerated spiropyran diffused into the hydrophobic surface.
关键词： Mesoporous silica,Surface modification,Negative photochromism
更新于2025-09-04 15:30:14