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• W3018657044 startingPage "8447" @default.
• W3018657044 abstract "The incorporation of molecular switches in organic structures is of great interest in the chemical design of stimuli-responsive materials that mimic the complex functions of living systems. Merocyanine dyes that convert to spiropyran moieties upon exposure to visible light have been extensively studied as they can be incorporated in hydrated covalent networks that will expel water when this conversion occurs and induce a volumetric shrinkage. We report here on a sulfonate-based water-soluble photoswitch that, in contrast to the well-known systems, triggers a volumetric expansion in hydrogels upon exposure to photons. Contraction is in turn observed under dark conditions in a highly reversible manner. The novel behavior of the photoswitch incorporated in the covalent network was predicted by coarse-grained simulations of the system’s chemical structure. Using pH control and polymeric structures that differ in lower critical solution temperature, we were able to develop hydrogels with highly tunable volumetric expansion. The novel molecular function of the systems developed here led to materials with the negative phototaxis observed in plants and could expand the potential use of hydrogels as sensors, soft robots, and actuators." @default.
• W3018657044 created "2020-05-01" @default.
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• W3018657044 date "2020-04-24" @default.
• W3018657044 modified "2023-10-18" @default.
• W3018657044 title "Light-Driven Expansion of Spiropyran Hydrogels" @default.
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• W3018657044 doi "https://doi.org/10.1021/jacs.0c02201" @default.
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• W3018657044 hasPublicationYear "2020" @default.
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