Sequential Oscillations in the Uncatalyzed Bromate Oscillator and Their Simple Qualitative Model

Adamčíková, Ľubica; Farbulová, Zuzana; Ševčı́k, Peter; Kawczyński, Andrzej L.

doi:10.1021/jp0212646

Cited by 21 publications

(19 citation statements)

References 23 publications

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“…It may be noted that, as reported by Adamčíkov'a et al, 26 dual frequency oscillations are very sensitive to the stirring rate. In general, saccharide oscillators have the following unique features involving dual control mechanism.…”

Section: Discussionsupporting

confidence: 53%

“…On combining (5), (6), and twice the step (7) we get which involves the autocatalysis of HBrO 2 On the other hand by adding (5), (6), and (7), we get which involves autocatalysis of BrO 2 • . As we can see, the autocatalytic process can be written in two alternative forms of (25) and (26). Thus both HBrO 2 and BrO 2 • are autocatalytic intermediates and any species reacting with them can inhibit the whole autocatalytic process.…”

Section: Discussionmentioning

confidence: 99%

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Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

et al. 2005

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Oscillations in a Belousov-Zhabotinskii (B-Z) system having oxalic acid (OA) and glucose (G) as a mixed organic substrate, neither of which acts as a bromine scavenger, have been investigated. Studies have been performed for (i) varying the concentration of G while keeping the OA concentration fixed and (ii) varying OA but keeping G fixed in a batch reactor. In both cases upper and lower critical limits occur, between which oscillations are observed. Both single and double frequency oscillations have been observed in a wide range of concentrations of G as well as of OA. The induction period in most of the cases was <1 min. When G is fixed and OA is varied, the time pause between the sequential oscillations increases with an increase in OA. On the other hand when OA is fixed and G is varied, the time-pause decreases with an increase in G. The first type of oscillation is Br(-)-controlled, whereas the second is non-Br(-)-controlled. The order of addition of G and OA in the last has no influence on the induction period. It influences, however, the oscillatory characteristics. Br(2) evolution in the G + OA + Ce(4+) + BrO(3)(-) + H(2)SO(4) reaction system has been investigated spectrophotometrically. ESR and polymerization studies indicate the important role of free radicals in influencing the reaction mechanism. A tentative dual control mechanism has been suggested involving autocatalysis of HBrO(2) and BrO2*.

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Section: Discussionsupporting

confidence: 53%

Section: Discussionmentioning

confidence: 99%

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

et al. 2005

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“…It may be noted that sequential oscillations are very sensitive to stirring in batch reactor [21] and exhibit variety of dynamic behaviour. Stirring can influence the diffusion of reactants and hence the rates of component reactions.…”

Section: Resultsmentioning

confidence: 99%

Oscillatory characteristics of a B–Z reacting system with xylose and oxalic acid as mixed substrate

Rastogi¹,

Singh²,

Chand

2004

Chemical Physics Letters

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“…Several experimental techniques have been used to elucidate the reaction mechanism of the UBO‐phenol. The most common is potentiometry using either platinum or bromide selective electrodes . Nonetheless, these techniques present two major drawbacks: The source of the redox potential oscillations is not well understood as in the catalyzed systems, and the interference produced by the highly passivating medium over the electrode .…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet-Visible Kinetic Study of the Uncatalyzed Bromate Oscillator with Phenol by Multivariate Curve Resolution

Robayo-Molina

Ágreda

2017

Int. J. Chem. Kinet.

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A kinetic study of the uncatalyzed bromate oscillator (UBO) using phenol was carried out by chemometric analysis of the UV/Vis data. The reaction was studied with different starting concentrations of the reagents (sulfuric acid and potassium bromate) and by changing phenol for 2-bromophenol and 4-bromophenol. The number of chemical absorbing species involved in the UV/Vis data was established by singular value decomposition and by the residual fit parameter. Multivariate curve resolution with alternating least squares generated valuable information about the different chemical species along the process (spectral and concentration profiles). These results show the presence of four principal components: two intermediates and two products. The products can be assigned as o-quinone and 4,4 -diphenoquinone, and the principal components associated with the intermediates represent the linear combination of all the intermediates in the reaction mixture. These data were used to generate a model of the UBO-phenol oscillator that reproduces qualitatively the experimental results. C

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Sequential Oscillations in the Uncatalyzed Bromate Oscillator and Their Simple Qualitative Model

Cited by 21 publications

References 23 publications

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

Dual Control Mechanism in a Belousov−Zhabotinskii (B−Z) Oscillator with Glucose and Oxalic Acid as a Double Substrate

Oscillatory characteristics of a B–Z reacting system with xylose and oxalic acid as mixed substrate

Ultraviolet-Visible Kinetic Study of the Uncatalyzed Bromate Oscillator with Phenol by Multivariate Curve Resolution

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