Oscillations in chemical systems. II. Thorough analysis of temporal oscillation in the bromate-cerium-malonic acid system

Field, Richard J.; Kőrös, E.; Noyes, Richard M.

doi:10.1021/ja00780a001

Cited by 1,452 publications

(941 citation statements)

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“…In fact, evidence of organophilic nature of bromomalonic acid has been recently provided, 36 and as previously stated, positively charged species have a great affinity with an anionic surfactant like SDS. Process 1.6 is part of the bromide ion regeneration process (process C) in the FKN mechanism, 37 and it was studied in detail. 27,33,35 Process C was found to be the most important step in determining the oscillation period of the BZ reaction, 38 and thus to corroborate our hypothesis, we simulated oscillations varying the constant of the reduction step (1.6), k r .…”

Section: Resultsmentioning

confidence: 99%

Spatio-Temporal Perturbation of the Dynamics of the Ferroin Catalyzed Belousov−Zhabotinsky Reaction in a Batch Reactor Caused by Sodium Dodecyl Sulfate Micelles

et al. 2008

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The effects of the anionic surfactant sodium dodecyl sulfate (SDS) on the spatio-temporal and temporal dynamics of the ferroin-catalyzed Belousov-Zhabotinsky (BZ) reaction have been studied over a wide surfactant concentration range. For the first time, investigations were performed also for unstirred systems. The presence of SDS in the reaction mixture influences the oscillatory parameters to an extent that significantly depends on the surfactant concentration. The trend of the wave speed V upon the increasing amount of SDS was found to have a maximum at [SDS] ) 0.075 mol dm -3 (V ) 0.071 mm s -1 ), after which the speed decreased to 0.043 mm s -1 at [SDS] ) 0.5 mol dm -3 , which is below the value found in the absence of the surfactant (V ) 0.055 mm s -1 ). The response of the oscillatory BZ system to the addition of SDS has been ascribed to two different causes: (a) the peculiar capability of the organized surfactant assemblies to affect the reactivity by selectively sequestering some key reacting species and (b) the modifications induced by SDS on the physical properties of the medium. These hypotheses have been corroborated by performing spectrophotometric investigations on the stirred BZ system. Complementary viscosity measurements gave useful hints for the clarification of the surfactant role.

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Section: Resultsmentioning

confidence: 99%

Spatio-Temporal Perturbation of the Dynamics of the Ferroin Catalyzed Belousov−Zhabotinsky Reaction in a Batch Reactor Caused by Sodium Dodecyl Sulfate Micelles

et al. 2008

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“…The main features of this reaction can be described successfully by the reaction mechanism proposed in 1972 by Field, Koros, and Noyes. 41 Within the framework of the Field-Koros-Noyes mechanism (FKN), the BZ reaction is reduced to the following three basic processes: [41][42][43][44] and M red = Ru(bpy) 3 2+ . As noted above, the cyclic change of the electric charge on the ruthenium ion causes the periodic swelling-deswelling of the gel in the course of the BZ reaction.…”

Section: Kinetics Of the Bz Reaction In Gelsmentioning

confidence: 99%

“…The essential features of the FKN mechanism can be captured by the Oregonator model proposed by Field and Noyes in 1974. 42 Within this model, the BZ reaction is described in terms of three variables and the sequence of five chemical reactions; 41 …”

Section: Kinetics Of the Bz Reaction In Gelsmentioning

confidence: 99%

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

et al. 2013

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Species ranging from single-cell organisms to social insects can undergo auto-chemotaxis, where the entities move towards a chemo-attractant that they themselves emit. Polymer gels undergoing the self-oscillating Belousov-Zhabotinsky (BZ) reaction exhibit autonomous, periodic pulsations, which produce chemical species collectively referred to as the activator. The diffusion of this activator into the surrounding solution affects the dynamic behavior of neighboring BZ gels and hence, the BZ gels not only emit, but also respond to self-generated chemical gradients. This review describes recent experimental and computational studies that reveal how this biomimetic behavior effectively allows neighboring BZ gels to undergo cooperative, self-propelled motion. These distinctive properties of the BZ gels provide a route for creating reconfigurable materials that autonomously communicate with neighboring units and thereby actively participate in constructing the desired structures.

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“…Reaction mixtures are prepared from aqueous stock solutions of analytical-grade sodium bromate (NaBrO 3 As the working electrode we use a glass-coated platinum wire with one end open to the electrolyte, immersed in 0.25 mL of BZ mixture held in a thin-walled 5 mm diameter glass tube. The working electrode potential is measured against a saturated calomel electrode (SCE, Fisher Scientific Accumet, gel filled) placed in a 1.5 cm diameter glass tube containing 0.25 M sodium sulfate (Na 2 SO 4 , Fisher) solution.…”

Section: Methodsmentioning

confidence: 99%

High-Frequency Oscillations in the Belousov−Zhabotinsky Reaction

et al. 2009

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Chemical oscillations in the classic Belousov-Zhabotinsky (BZ) system typically have a period of a few minutes, which can be increased significantly by changing the organic substrate. Here we show that by changing the temperature and concentrations, an increase of 3-4 orders of magnitude in the frequency of BZ oscillations can be obtained. At elevated temperatures, in high concentration mixtures, the cerium-catalyzed reaction exhibits sinusoidal oscillations with frequencies of 10 Hz or greater. We report the effect of temperature on the frequency and shape of oscillations in experiments under batch conditions and in a four-variable model. We show that our simple model accurately captures the complex temporal behavior of the system and suggests paths toward even higher frequencies.

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Oscillations in chemical systems. II. Thorough analysis of temporal oscillation in the bromate-cerium-malonic acid system

Cited by 1,452 publications

References 0 publications

Spatio-Temporal Perturbation of the Dynamics of the Ferroin Catalyzed Belousov−Zhabotinsky Reaction in a Batch Reactor Caused by Sodium Dodecyl Sulfate Micelles

Spatio-Temporal Perturbation of the Dynamics of the Ferroin Catalyzed Belousov−Zhabotinsky Reaction in a Batch Reactor Caused by Sodium Dodecyl Sulfate Micelles

Chemo-responsive, self-oscillating gels that undergo biomimetic communication

High-Frequency Oscillations in the Belousov−Zhabotinsky Reaction

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