Excitability of the ferroin-catalyzed Belousov–Zhabotinsky reaction with pyrogallol

Luengviriya, Chaiya; Luengviriya, Jiraporn; Sutthiopad, Malee; Porjai, Porramain; Tomapatanaget, Boosayarat; Müller, Stefan

doi:10.1016/j.cplett.2013.01.041

Cited by 3 publications

(2 citation statements)

References 38 publications

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“…Even though waves were initiated, they only survived for a short time and the media changed rapidly from red to blue. In this case, the systems were in a so-called stable oxidized state as reported recently in our article (Luengviriya et al, 2013).…”

Section: Methodssupporting

confidence: 63%

Influence of Acidity on Spiral Waves in a Bubble-Free Belousov-Zhabotinsky Reaction with Pyrogallol

Luengviriya¹,

Luengviriya

2014

CMUJNS

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Spiral waves are ubiquitously observed in a variety of physical and biological systems, including superconductors, superfluids, CO-oxidation on platinum surfaces, cell aggregation of slime mold and arrhythmia in cardiac tissues. Such spiral waves are uniquely explained by a reaction-diffusion mechanism. Due to easy preparation and convenient detection, the excitable chemical Belousov-Zhabotinsky (BZ) reaction is employed to study spiral waves in experiments. We studied the influence of initial concentration of H 2 SO 4 ([H 2 SO 4 ]) on the dynamics of spiral waves in a thin layer of the BZ reaction with pyrogallol. This reaction has an advantage over the classical BZ reaction with malonic acid, as it is bubble-free. We found that the spiral tip, i.e., the organizing center, moved along so-called meandering trajectories with three or four outward petals. In addition, the area occupied by the spiral tip decreased when [H 2 SO 4 ] was increased. We further investigated the dynamics far from the organizing center by measuring properties of propagating fronts. An increase of [H 2 SO 4 ] resulted in a simultaneous decrease of the wavelength and wave period. In contrast, the wave speed grew with [H 2 SO 4 ]. Since disturbances by the byproduct CO 2 bubbles are avoided and the wave velocity is sufficiently low, the results present a suitable guideline for further investigations on propagating excitation waves in two-and three-dimensional excitable media, especially observations of wave instabilities in three-dimensional systems using optical tomography.

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Section: Methodssupporting

confidence: 63%

Influence of Acidity on Spiral Waves in a Bubble-Free Belousov-Zhabotinsky Reaction with Pyrogallol

Luengviriya¹,

Luengviriya

2014

CMUJNS

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“…However, no attempt was made to study the effect that addition of one-electron redox couples would have on the above nonlinear system. Introduction of metal catalysts such as ferroin or cerium ions to the reaction has the ability to generate a second autocatalytic cycle through their reactions with bromine dioxide. − Körös and co-workers have reported that spontaneous oscillations could be revived in the uncatalyzed bromate–aromatic compound oscillators upon the introduction of one-electron redox couples, implicating that a nonlinear system consisting of multiple oscillatory subunits might be conveniently constructed by introducing metal ions into bromate–aromatic compound oscillators.…”

Section: Introductionmentioning

confidence: 99%

Complex Reaction Dynamics in the Cerium–Bromate–2-Methyl-1,4-hydroquinone Photoreaction

2014

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Spontaneous oscillations with a long induction time were observed in the bromate-2-methyl-1,4-hydroquinone photoreaction in a batch reactor, where removal of illumination effectively quenched any reactivity. A substantial lengthening of the oscillatory window and a dramatic increase in the complexity of the reaction behavior arose upon the addition of cerium ions, in which separate bifurcation regions and mixed mode oscillations were present. The complexity has a strong dependence on the intensity of illumination supplied to the system and on the initial concentrations of the reactants. (1)H NMR spectroscopy measurements show that the photoreduction of 2-methyl-1,4-benzoquinone leads to the formation of 2-methyl-1,4-hydroquinone and the compound 2-hydroxy-3-methyl-1,4-benzoquinone. Spectroscopic investigation also indicates that the presence of methyl group hinders the bromination of the studied organic substrate 2-methyl-1,4-hydroquinone, resulting in the formation of 2-methyl-1,4-benzoquinone.

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Meandering spiral waves in a bubble-free Belousov–Zhabotinsky reaction with pyrogallol

Luengviriya

Porjai

Phantu

et al. 2013

Chemical Physics Letters

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Excitability of the ferroin-catalyzed Belousov–Zhabotinsky reaction with pyrogallol

Cited by 3 publications

References 38 publications

Influence of Acidity on Spiral Waves in a Bubble-Free Belousov-Zhabotinsky Reaction with Pyrogallol

Influence of Acidity on Spiral Waves in a Bubble-Free Belousov-Zhabotinsky Reaction with Pyrogallol

Complex Reaction Dynamics in the Cerium–Bromate–2-Methyl-1,4-hydroquinone Photoreaction

Meandering spiral waves in a bubble-free Belousov–Zhabotinsky reaction with pyrogallol

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