Spatial bistability and waves in a reaction with acid autocatalysis |
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Authors: | Boissonade J Dulos E Gauffre F Kuperman M N De Kepper P |
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Institution: | Centre de Recherche Paul Pascal, C.N.R.S. Bordeaux, Avenue Schweitzer, F-33600 Pessac, France. |
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Abstract: | The phenomenon of spatial bistability has recently been proposed for a comprehensive understanding of a number of chemical patterns observed in open spatial reactors consisting of thin films of gel diffusively fed from one side. We study experimentally and numerically this phenomenon in the tetrathionate-chlorite reaction characterized by an acid superautocatalysis. We focus on the similarities and differences with previous studies on the chlorine dioxide-iodide reaction. In addition, we show that this reaction, which is only bistable in a continuous stirred tank reactor, can exhibit oscillatory and traveling waves when diffusion comes into play. Our computations suggest that the nonstationary behaviour originates from differential diffusive transport. |
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