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Unidirectionality of Chemical Diode

T. Yamaguchi, T. Kusumi, R. R. Aliev, T. Amemiya, T. Ohmori,
M. Nakaiwa, K. Urabe, S. Kinugasa, H. Hashimoto, and K. Yoshikawa
[ACH-Models in Chemistry, Vol. 135, No. 3, pp. 401-408, 1998]

Unidirectionality of a chemical diode for chemical wave transmission in the Belousov-Zhabotinsky media is discussed based on a logistic-type ODE that is derived from the Rovinsky-Zhabotinsky model: dx/dt = x(phi-x), where the influence of diffusion is compressed within the parameter, phi. No wave transmission takes place beyond the critical gap width, i.e., it takes infinite time for the chemical wave to be transmitted. This idea is developed to explain the switching of unidirectionality under high acidic conditions.

Fig. 1. The sequential snapshots of chemical wave transmission with the interval of 3 s. a) In the PC-junction (the gap width G = 168 mm), b) in the CP-junction (G = 112 mm). The acidity is 0.14. The upper and the lower layers indicate the concentration profiles of x (activator) and z (inhibitor), respectively.

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