Pattern formation in the iodate-sulfite-thiosulfate reaction-diffusion system

Haimiao Liu, John A. Pojman, Yuemin Zhao, Changwei Pan, Juhua Zheng, Ling Yuan, Attila K. Horváth, Qingyu Gao

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27 Citations (Scopus)

Abstract

Sodium polyacrylate-induced pH pattern formation and starch-induced iodine pattern formation were investigated in the iodate-sulfite-thiosulfate (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.

Original languageEnglish
Pages (from-to)131-137
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume14
Issue number1
DOIs
Publication statusPublished - Jan 7 2012

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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