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Issue 1, 2012
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Pattern formation in the iodatesulfitethiosulfate reaction–diffusion system

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Abstract

Sodium polyacrylate-induced pH pattern formation and starch-induced iodine pattern formation were investigated in the iodatesulfitethiosulfate (IST) reaction in a one-side fed disc gel reactor (OSFR). As binding agents of the autocatalyst of hydrogen ions or iodide ions, different content of sodium polyacrylate or starch has induced various types of pattern formation. We observed pH pulses, striped patterns, mixed spots and stripes, and hexagonal spots upon increasing the content of sodium polyacrylate and observed iodine pulses, branched patterns, and labyrinthine patterns upon increasing the starch content in the system. Coexistence of a pH front and an iodine front was also studied in a batch IST reaction–diffusion system. Both pH and iodine front instabilities were observed in the presence of sodium polyacrylate, i.e., cellular fronts and transient Turing structures resulting from the decrease in diffusion coefficients of activators. The mechanism of multiple feedback may explain the different patterns in the IST reaction–diffusion system.

Graphical abstract: Pattern formation in the iodate–sulfite–thiosulfate reaction–diffusion system

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Publication details

The article was received on 13 Jul 2011, accepted on 11 Oct 2011 and first published on 08 Nov 2011


Article type: Paper
DOI: 10.1039/C1CP22281C
Citation: Phys. Chem. Chem. Phys., 2012,14, 131-137
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    Pattern formation in the iodatesulfitethiosulfate reaction–diffusion system

    H. Liu, J. A. Pojman, Y. Zhao, C. Pan, J. Zheng, L. Yuan, A. K. Horváth and Q. Gao, Phys. Chem. Chem. Phys., 2012, 14, 131
    DOI: 10.1039/C1CP22281C

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