New Finding for Belousov–Zhabotinsky

  • Author: ChemViews
  • Published Date: 23 January 2011
  • Source / Publisher: Chemistry - A European Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: New Finding for Belousov–Zhabotinsky

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Cross-diffusion, the phenomenon in which a flux of one species is induced by a concentration gradient of another species, can affect or even induce dissipative patterns in reaction-diffusion systems.

Irving Epstein and co-workers, Brandeis University, USA, have studied the cross-diffusion coefficients in the pentanary system: the Belousov–Zhabotinsky (BZ) reaction dispersed in a water-in-oil aerosol OT (AOT) microemulsion. This is the first time that cross-diffusion coefficients have been measured for a five-component system. The team used a modified Taylor dispersion method, initially developed for a three-component system, which also has been applied to a four-component system.

The cross-diffusion coefficients between BZ1 (either NaBr, an inhibitor of the BZ reaction, or ferroin, a catalyst) and Br2 are found to be negative, which can be understood in terms of complexation between these species. This leads to a noticeable shift in the onset of Turing instability in the BZ–AOT system.

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Magazine of Chemistry Europe (16 European Chemical Societies) published by Wiley-VCH