Front dynamics of pH oscillators with initially separated reactants

Dúzs, Brigitta; Szalai, István

doi:10.1007/s11144-017-1329-1

Cited by 3 publications

(7 citation statements)

References 18 publications

(13 reference statements)

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“…The addition of bromide ions improves the visibility of the pattern by increasing its wavelength, which is also a desired feature in this context. It can be used not only with the CDIMA but with other nonlinear chemical reactions, for example, the BZ reaction 18 and Landolt-type pH oscillators 25 to study RD phenomena at special initial and boundary conditions. As an exclusive feature, it is easy to change the direction of observation in successive experiments because the switch between SbS and TaB geometries can be achieved without a hitch.…”

Section: Discussionmentioning

confidence: 99%

Turing Patterns and Waves in Closed Two-Layer Gel Reactors

2019

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Reaction–diffusion waves and stationary Turing patterns are observed in closed two-layer gel reactors, where the two compartments are initially filled with complementary sets of reactants of the chlorine dioxide–iodine–malonic acid–poly(vinyl alcohol) reaction. The asymmetrical loading generates concentration gradients and the patterns form at the interface between the two parts. These easy-to-perform experiments allow us to study a wide range of dynamical phenomena without requiring a specific reactor design or the use of sophisticated equipment. To get complementary information on pattern formation in parallel and perpendicular to the direction of the concentration gradients, two geometrically different configurations of compartments are presented. We demonstrate that three variants of the initial distribution of the chemicals can be equally applied, and this flexibility provides a way to introduce additional reagents to perturb the dynamics of the systems. A noticeable increase in the wavelength of Turing patterns and in the period of waves has been induced by adding bromide ions. The interaction of Turing and Hopf modes has been observed as a result of not only the variation of the initial poly(vinyl alcohol) concentration but that of the gradients as well.

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Section: Discussionmentioning

confidence: 99%

Turing Patterns and Waves in Closed Two-Layer Gel Reactors

2019

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“…18 To search for experimental evidence of our predicted oscillating viscous ngering dynamics, the recent viscous ngering obtained using a clock reaction 26 with pH-changing properties 25 is a good starting point. The fact that front dynamics in A + B → oscillator con gurations also start to be experimentally available in pH oscillators 23 enriches the possibility of trying to tune ngering using Chaos ARTICLE scitation.org/journal/cha pH-sensitive polymers. 10,11 It would be very nice to be able to couple viscous e ects with the canonical oscillating Belousov-Zhabotinky reaction around an A + B → oscillator con guration.…”

Section: Discussionmentioning

confidence: 99%

“…[16][17][18] Localized oscillations 19 or stationary Turing patterns 20,21 can be obtained in autocatalytic reactions around A + B → oscillator fronts when putting in contact two zones containing separate reactants A and B of an oscillatory reaction. 17,18,22,23 From the theoretical point of view, it has been shown that localized oscillations and Turing structures can interact with buoyancy-driven ows when the reactants A and B of the oscillatory Brusselator model are initially separated, meet by di usion, and produce the intermediate X and Y species locally, which changes the density. 18 Experimentally, interplay between the oscillating Belousov-Zhabotinsky (BZ) reaction and buoyancy-driven motions has been analyzed when two subsets of the reactants are put in contact along a horizontal line in the gravity eld.…”

Section: Introductionmentioning

confidence: 99%

Reaction-driven oscillating viscous fingering

Rana

Wit

2019

Chaos: An Interdisciplinary Journal of Nonlinear Science

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Localized oscillations can develop thanks to the interplay of reaction and di usion processes when two reactants A and B of an oscillating reaction are placed in contact, meet by di usion, and react. We study numerically the properties of such an A + B → oscillator con guration using the Brusselator model. The in uence of a hydrodynamic viscous ngering instability on localized concentration oscillations is next analyzed when the oscillating chemical reaction changes the viscosity of the solutions involved. Nonlinear simulations of the related reaction-di usion-convection equations with the uid viscosity varying with the concentration of an intermediate oscillatory species show an active coupling between the oscillatory kinetics and the viscously driven instability. The periodic oscillations in the concentration of the intermediate species induce localized changes in the viscosity, which in turn can a ect the ngering instability. We show that the oscillating kinetics can also trigger viscous ngering in an initially viscously stable displacement, while localized changes in the viscosity pro le can induce oscillations in an initially nonoscillating reactive system.

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“…During the last three years, we have started to explore systematically the RD dynamics of H + -autocatalytic reactions in reactors with separated sources of reactants [25][26][27]. In our experiments, the BS-based reactions-above all the BSF system-were preferred to use.…”

Section: Reaction-diffusion Patterns In Gel Reactors With Separated Sources Of Reactantsmentioning

confidence: 99%

“…A and B indicate different subsets of reactants. For details see References [25][26][27] (Fig. 6a and c).…”

Section: Reaction-diffusion Patterns In Gel Reactors With Separated Sources Of Reactantsmentioning

confidence: 99%

Recent advances in the temporal and spatiotemporal dynamics induced by bromate–sulfite-based pH-oscillators

Szalai

Dúzs

Molnár

et al. 2021

Reac Kinet Mech Cat

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The bromate–sulfite reaction-based pH-oscillators represent one of the most useful subgroup among the chemical oscillators. They provide strong H+-pulses which can generate temporal oscillations in other systems coupled to them and they show wide variety of spatiotemporal dynamics when they are carried out in different gel reactors. Some examples are discussed. When pH-dependent chemical and physical processes are linked to a bromate–sulfite-based oscillator, rhythmic changes can appear in the concentration of some cations and anions, in the distribution of the species in a pH-sensitive stepwise complex formation, in the oxidation number of the central cation in a chelate complex, in the volume or the desorption-adsorption ability of a piece of gel. These reactions are quite suitable for generating spatiotemporal patterns in open reactors. Many reaction–diffusion phenomena, moving and stationary patterns, have been recently observed experimentally using different reactor configurations, which allow exploring the effect of different initial and boundary conditions. Here, we summarize the most relevant aspects of these experimental and numerical studies on bromate–sulfite reaction-based reaction–diffusion systems.

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Front dynamics of pH oscillators with initially separated reactants

Cited by 3 publications

References 18 publications

Turing Patterns and Waves in Closed Two-Layer Gel Reactors

Turing Patterns and Waves in Closed Two-Layer Gel Reactors

Reaction-driven oscillating viscous fingering

Recent advances in the temporal and spatiotemporal dynamics induced by bromate–sulfite-based pH-oscillators

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