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• W3134718487 abstract "In coordination-based supramolecular materials such as metallogels, simultaneous temporal and spatial control of their assembly remains challenging. Here, we demonstrate that the combination of light with acids as stimuli allows for the spatiotemporal control over the architectures, mechanical properties, and shape of porous soft materials based on metal–organic polyhedra (MOPs). First, we show that the formation of a colloidal gel network from a preformed kinetically trapped MOP solution can be triggered upon addition of trifluoroacetic acid (TFA) and that acid concentration determines the reaction kinetics. As determined by time-resolved dynamic light scattering, UV–vis absorption, and 1H NMR spectroscopies and rheology measurements, the consequences of the increase in acid concentration are (i) an increase in the cross-linking between MOPs; (ii) a growth in the size of the colloidal particles forming the gel network; (iii) an increase in the density of the colloidal network; and (iv) a decrease in the ductility and stiffness of the resulting gel. We then demonstrate that irradiation of a dispersed photoacid generator, pyranine, allows the spatiotemporal control of the gel formation by locally triggering the self-assembly process. Using this methodology, we show that the gel can be patterned into a desired shape. Such precise positioning of the assembled structures, combined with the stable and permanent porosity of MOPs, could allow their integration into devices for applications such as sensing, separation, catalysis, or drug release." @default.
• W3134718487 created "2021-03-15" @default.
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• W3134718487 date "2021-03-01" @default.
• W3134718487 modified "2023-10-18" @default.
• W3134718487 title "Spatiotemporal Control of Supramolecular Polymerization and Gelation of Metal–Organic Polyhedra" @default.
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• W3134718487 doi "https://doi.org/10.1021/jacs.1c00108" @default.
• W3134718487 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/33646776" @default.
• W3134718487 hasPublicationYear "2021" @default.
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