Abstract
Formerly, we demonstrated in three chemical systems how the combination of the shrinking response of an appropriate responsive gel and a pH-switch type chemical reaction, which is not capable of oscillations by itself, can lead to self-oscillations in size and in pH in a piece of gel surrounded by a constant environment. We demonstrate that this can be realized at very mild chemical conditions: at ionic strength ∼0.015 M, with acid generated in concentrations ∼10 micromol/liter, and without halogen-containing oxidant. We discuss in detail how to adjust the gel-response to the chemical reaction for sustained motion. Travelling contraction wave trains along a long thin cylinder (Rsw < 0.50 mm) were sustained for more than 2 days. Considering the environmentally neutral reaction wastes, free from halogens or metal ions, biomaterials become attainable matrices in contrast to former chemomechanical oscillators which all operated under much harsher chemical conditions.
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