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- W3204692313 abstract "The crystallization of metastable liquid “phase change materials” releases stored energy as latent heat upon nucleation and may therefore provide a triggerable means of activating downstream processes that respond to changes in temperature. In this work, we describe a strategy for controlling the fast, exothermic crystallization of sodium acetate from a metastable aqueous solution into trihydrate crystals within a polyacrylamide hydrogel whose polymerization state has been patterned using photomasks. A comprehensive experimental study of crystal shapes, crystal growth front velocities and evolving thermal profiles showed that rapid growth of long needle-like crystals through unpolymerized solutions produced peak temperatures of up to 45˚C, while slower-crystallizing polymerized solutions produced polycrystalline composites and peaked at 30˚C due to lower rates of heat release relative to dissipation in these regions. This temperature difference and propagating heat waves, which we describe using a proposed analytical model, enable the use of this strategy to selectively activate thermoresponsive processes in predefined areas." @default.
- W3204692313 created "2021-10-11" @default.
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- W3204692313 date "2021-08-04" @default.
- W3204692313 modified "2023-09-27" @default.
- W3204692313 title "Patterned crystal growth and heat wave generation in hydrogels" @default.
- W3204692313 doi "https://doi.org/10.33774/chemrxiv-2021-rjk1v" @default.
- W3204692313 hasPublicationYear "2021" @default.
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