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In this letter, we demonstrate that oscillations and excitable behavior canbe imparted to a chemical network by coupling the network to an activehydrogel. We discuss two mechanisms by which the mechanical response of the gelto the embedded chemical reactant provides feedback into the chemistry. Thesefeedback mechanisms can be applied to control existing chemical oscillations aswell as create new oscillations under some conditions. We analyze two modelsystems to demonstrate these two effects, respectively: a theoretical systemthat exhibits no excitability in the absence of a gel, and the Oregonator modelof the Belousov-Zhabotinsky reaction in which the metal catalyst isintercalated into the polymer network. This work can aid in designing newmaterials that harness these feedbacks to create, control, and stabilizeoscillatory and excitable chemical behavior in both oscillatory andnon-oscillatory chemical networks.

Coupling chemical networks to hydrogels controls oscillatory behavior