Experimental realization and control of chemical turing-like patterns

Watzl, M; Fecher, Frank W.; Münster, Arno F.

doi:10.1007/bfb0104235

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“…If this nonlinear reaction is run together with the polymerization of acrylamide, Turing-like patterns of high symmetry embedded in a reactive gel matrix are formed. − After the gelation process of acrylamide has been completed, these patterns become sensitive toward an electrical field. , The coexistence of quasistationary domains with field-induced pulse waves is demonstrated. In some experiments, the applied electrical field leads to a lateral instability of the wave front, and complex spatio−temporal behavior is observed instead of a simple pulse wave 1 Experimental setup used for the investigation of a quasi-one-dimensional pattern under the influence of an electrical field.…”

Section: Introductionmentioning

confidence: 99%

Chemical Instability Induced by an Electric Field

2000

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In a quasi-one-dimensional reaction−diffusion−migration system based on the methylene blue−sulfide−oxygen oscillatory reaction in a matrix of polyacrylamide gel, almost stationary patterns are observed. A weak electrical field applied to the system induces waves which travel toward the cathode. Close to the anode, the initially observed stationary pattern remains stable. In some experiments, a lateral instability of the wave front is also observed. The spatio−temporal dynamics is analyzed by the Karhunen−Loeve decomposition technique, and entropy-like quantities are used to describe the dynamics. Numerical simulations based on a chemically realistic model confirm the experimental observations.

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