Condensed Matter > Soft Condensed Matter
[Submitted on 20 Jan 2022 (v1), last revised 7 Feb 2024 (this version, v2)]
Title:Active pulsatile gels: from chemical microreactor to polymeric actuator
View PDFAbstract:We report on a synthesis protocol, experimental characterization and theoretical modeling of active pulsatile Belousov-Zhabotinsky (BZ) hydrogels. Our two-step synthesis technique allows independent optimization of the geometry, the chemical, and the mechanical properties of BZ gels. We identify the role of the surrounding medium chemistry and gel radius for the occurrence of BZ gel oscillations, quantified by the Damkohler number, ratio of chemical reaction to diffusion rates. Tuning the BZ gel size to maximize its chemomechanical oscillation amplitude, we find that its oscillatory strain amplitude is limited by the timescale of gel swelling relative to the chemical oscillation period. Our experimental findings are in good agreement with a Vanag-Epstein model of BZ chemistry and a Tanaka Fillmore theory of gel swelling dynamics.
Submission history
From: Baptiste Blanc [view email][v1] Thu, 20 Jan 2022 16:25:01 UTC (500 KB)
[v2] Wed, 7 Feb 2024 16:47:40 UTC (584 KB)
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