Photo-response of chemical oscillators

Hanazaki, Ichiro; Mori, Yoshihito; Sekiguchi, Tetsuo; Rábai, Gyula

doi:10.1016/0167-2789(95)00028-3

Cited by 39 publications

(65 citation statements)

References 20 publications

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“…Since HBrO 2 must be produced and Ru(bpy) 3 2+ undoubtedly is involved in the photochemical reaction, it is natural to consider the following reactions with oxidation of one Ru(bpy) 3 2+ in an excited state 13 or, perhaps less likely, with both Ru(bpy) 3 2+ excited 8…”

Section: +mentioning

confidence: 99%

Quenching of Chemical Oscillations with Light

1996

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We show that it is possible to quench oscillations of the ruthenium bipyridyl catalyzed Belousov-Zhabotinsky reaction by a pulse of light when the system is run close to a supercritical Hopf bifurcation. The response to light depends on the phase of oscillations at the exposure and on the total absorbed radiant energy. It is characteristic of a quenching associated with the geometry of a limit cycle and invariant manifolds of a saddle focus created by a Hopf bifurcation. The experimental results impose a constraint on the possible production and consumption of species induced by light. It can help clarify the mechanism of the effect of light on the system. This is important to the use of light for studying chemical waves and for chaos control.

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Section: +mentioning

confidence: 99%

Quenching of Chemical Oscillations with Light

1996

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“…5 The second reason is related to their photosensitivity. 6,7 We have recently studied the photoresponse of the hydrogen peroxideferrocyanide reaction [8][9][10] and also the bromate-sulfiteferrocyanide system. 11 Although the photoresponse of these systems is interesting by itself in relation to the detailed mechanism of nonlinear chemical reactions, it would also be interesting for the possibility of controlling the spatial patterns with light irradiation.…”

Section: Introductionmentioning

confidence: 99%

Origin of chemical instability in the bromate–sulfite flow system

Hanazaki

Rábai

1996

The Journal of Chemical Physics

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Quasiperiodicity in a detailed model of the peroxidase-oxidase reaction A scrutiny of the premise of the Rice-Ramsperger-Kassel-Marcus theory in isomerization reaction of an Ar7type moleculeThe origin of the instability observed in the bromate-sulfite-proton system is discussed. This is known as the subsystem of some pH oscillators which provides the positive feedback channel for H ϩ . It is composed of the following two fast equilibria: H ϩ ϩSO 3 2Ϫ ↔HSO 3Ϫ and H ϩ ϩHSO 3 Ϫ ↔H 2 SO 3 and the oxidation of HSO 3Ϫ and H 2 SO 3 by BrO 3 Ϫ to recover the initially supplied proton as 3HSO 3This scheme exhibits bistability under flow conditions. It gives rise to chemical oscillations if it is coupled with a simple linear decay process of H ϩ as a negative feedback channel. It is also capable of exhibiting chaotic behavior in the presence of HCO 3Ϫ . We analyze the nature of the strong nonlinearity provided by the above scheme in detail and show that it arises essentially from the fast reaction of H 2 SO 3 with bromate. The simplicity of the scheme enables us to describe the system dynamics with three variables without any approximation. As a result, we now have a model in hand in which we can compare the theoretical results directly and quantitatively with the corresponding experiments. This situation may open a way to understand the complexity in nonlinear chemical systems in a more quantitative manner. Some recent experimental findings of complex oscillatory behavior including chaos for the system with more realistic negative feedback channels, or for the system in which BrO 3Ϫ is replaced with H 2 O 2 , are discussed on the basis of the present analysis.

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“…Yamaguchi et al, [145] however, suggested that the additional source of Brmay come from BrMA. In order to explain photoinduction, Hanazaki and coworkers [146,147] suggested that photochemical production of the autocatalyst might be taking place. Kadar et al [148] investigated the light sensitivity of the inorganic and organic subsets of the BZ system.…”

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confidence: 99%

Mechanism and Phenomenology of an Oscillating Chemical Reaction

Taylor

2002

Progress in Reaction Kinetics and Mechanism

120

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Chemical reactions, which are far from equilibrium, are capable of displaying oscillations in species concentrations and hence in colour, electrode potential, pH and/or temperature. The oscillations arise from the interplay between positive and negative kinetic feedback. Mechanisms for such reactions are presented, along with the rich phenomenology that these systems exhibit, from complex oscillations and chemical waves, to stationary concentration patterns. This review will focus on the Belousov-Zhabotinksy reaction but reference to other reactions will be made where appropriate.

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Photo-response of chemical oscillators

Cited by 39 publications

References 20 publications

Quenching of Chemical Oscillations with Light

Quenching of Chemical Oscillations with Light

Origin of chemical instability in the bromate–sulfite flow system

Mechanism and Phenomenology of an Oscillating Chemical Reaction

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