Photosensitive, Bubble-free, Bromate−1,4-Cyclohexanedione Oscillating Reactions. Illumination Control of Pattern Formation

Kurin-Csörgei, Krisztina; Zhabotinsky, Anatol M.; Orbán, Miklós; Epstein, Irving R.

doi:10.1021/jp970763h

Cited by 42 publications

(45 citation statements)

References 15 publications

(22 reference statements)

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“…Based on our studies on the effect of visible light illumination, we found that wave propagation was greatly photosensitive to intense illumination. Stronger illumination greatly modulated the pattern of wave propagation and eliminated wave activity; these results are similar to those of Kurin-Csörgei et al 23 in the ferroin-immoblized resin system using a modified BZ system with 1,4-CHD. The weak photosensitivity of the wave pattern in this gel system may be due to the metal catalyst being covalently bonded through the cross-linking present in the gel network.…”

Section: Resultssupporting

confidence: 87%

“…22 The absence of gas production makes this system an attractive candidate for investigating chemical wave formation. [22][23][24][25][26] Another interesting and dynamic feature of bromate-1,4-cyclohexanedione-ferroin oscillating reaction is its complicated response to illumination. Kurin-Csörgei et al reported that illumination with moderate intensity results in an increase in frequency of oscillations and wave speed in bromate-1,4-cyclohexanedione-ferroin reaction; however, stronger illumination eliminates wave activity.…”

Section: Introductionmentioning

confidence: 99%

“…Kurin-Csörgei et al reported that illumination with moderate intensity results in an increase in frequency of oscillations and wave speed in bromate-1,4-cyclohexanedione-ferroin reaction; however, stronger illumination eliminates wave activity. 23 Huh et al previously reported a characteristic wave propagation in the bubble-free BZ reaction system using 1,4-cyclohexanedione with ferroin catalyst that was immobilized in a cationexchange resin. 14 In the reaction system, a new kind of wave is induced spontaneously under a long time lag after the disappearance of the initially induced wave.…”

Section: Introductionmentioning

confidence: 99%

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Propagating Spiral Waves Obtained in a Catalyst-Immobilized Gel Membrane by the Belousov-Zhabotinsky Reaction System

Kim¹,

Jo²,

Basavaraja³

et al. 2010

Bulletin of the Korean Chemical Society

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The formation of diverse spiral waves was studied in a polyacrylamide gel membrane with ruthenium(4-vinyl-4'-methyl-2,2'-bipyridine)bis(2,2'-bipyridine)bis(hexafluorophosphate) by a gas-free Belousov-Zhabotinisky (BZ) reaction system containing 1,4-cyclohexanedione (1,4-CHD). The gel membrane was found to be receptive for observing propagating waves since a clearer wave-train is obtained during a long reaction time without any disturbance from the immobilized metal catalyst which can be dissolved into the highly acidic solution of the BZ system. The distinctive waves in the system basically depend on both BrO3  and 1,4-CHD in the initial phase, and are influenced by the intensity of illumination of visible light.

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Propagating Spiral Waves Obtained in a Catalyst-Immobilized Gel Membrane by the Belousov-Zhabotinsky Reaction System

Kim¹,

Jo²,

Basavaraja³

et al. 2010

Bulletin of the Korean Chemical Society

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“…De fato, o desprendimento de produto gasoso perturba não apenas a observação de estruturas espaço-temporais em sistemas estagnados, mas também a investigação de transições temporais sutis em sistemas mantidos sob agitação. Esforços têm sido realizados na tentativa de mitigar a formação de bolhas em sistemas químicos com base nos osciladores envolvendo bromato 17,19,20 . A substituição do ácido malônico por outro substrato orgânico tem sido apontada como uma alternativa eficiente na supressão da formação de bolhas 17,[21][22][23] .…”

Section: A Reação De Belousov-zhabotinskyunclassified

Dinâmica complexa no sistema bromato/hipofosfito/acetona/manganês e ferroína

Tokoro¹,

Oliveira²,

Varela³

2007

Quím. Nova

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Recebido em 19/12/06; aceito em 10/4/07; publicado na web em 25/10/07 COMPLEX DYNAMICS IN THE BROMATE/HYPOPHOSPHITE/ACETONE/MANGANESE AND FERROIN SYSTEM. New chemical systems have been recently designed for the study of complex phenomena such as oscillatory dynamics in the temporal domain and spatiotemporal pattern formation. Systems derived from oscillators based on the chemistry of bromate are the most extensively studied, with the celebrated Belousov-Zhabotinsky (BZ) reaction being the most popular example. Problems such as the formation of bubbles (CO 2 ) and solid precipitate in the course of the reaction and the occurrence of simply short-lived oscillations under batch conditions are very common and, in some cases, compromise the use of some of these systems. It is investigated in this paper the dynamic behavior of the bromate/hypophosphite/acetone/dual catalyst system, which has been sugested as an interesting alternative to circumvent those inconvenients. In this work, manganese and ferroin are employed as catalysts and the complete system (BrO 3 -/H 2 PO 2 -/acetone/Mn(II)-ferroin) is studied under batch conditions. Temporal symmetry breaking was studied in a reactor under agitation by means of simultaneous records of the potential changes of platinum and Ag/AgBr electrodes, both measured versus a reversible hydrogen electrode. Additionally, spatio-temporal formation of target patterns and spiral waves were obtained when the oscillating mixture was placed in a quasi two-dimensional reactor.Keywords: oscillations; chemical kinetics; pattern formation. INTRODUÇÃO Propriedades emergentes e sistemas complexosDefine-se formalmente comportamento emergente como "comportamento coletivo de um agregado de subunidades fisicamente similares não observado individualmente por nenhuma sub-unidade" 1 . Em um contexto mais amplo, Korn 2 compilou as principais definições de propriedades emergentes como sendo dadas em termos: da não aditividade das suas partes; de uma novidade, algo simplesmente novo; da não dedutibilidade e, da não preditabilidade. Finalmente, o autor 2 encerra que emergência é a nova associação que conduz a novas e estáveis configurações observáveis. Emergência é a propriedade mais importante dos sistemas complexos. O comportamento de um sistema complexo não pode ser entendido em termos apenas da extrapolação das propriedades dos seus componentes individuais, ou seja, as propriedades que surgem no nível macroscópico não podem ser preditas a partir das propriedades dos componentes microscópicos, como apresentado no artigo clássico More is different 3 .Whitesides e Ismagilov 4 classificaram um sistema complexo como um sistema no qual: sua evolução é muito sensível às condições iniciais ou a pequenas perturbações; o número de componentes independentes interagindo é grande ou, um no qual há vários caminhos através dos quais a evolução do sistema pode proceder. Comportamento complexo expresso na forma de cinética oscilatória e estruturação espacial, por exemplo, é comum em muitos sistemas reacionais mantidos...

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“…If trigger waves can also arise in such a situation, what is the fundamental difference between trigger and packet waves ? In this paper we analyze trigger waves produced by a pure finite wavelength instability in a Brusselator-like reactiondiffusion model and compare these simulated results with our experimental results on accelerating waves in the BZ-AOT system, and with Hamik et al's experiments 5 on stacking or shock structures in the aqueous 1,4-cyclohexanedione BZ system. 6 Although the Brusselator does not precisely mimic the chemistry of the actual BZ reaction, it is dynamically similar and computationally tractable and has been used in numerous studies of chemical oscillators. For example, both oscillatory cluster patterns in a BZ system subject to periodic perturbation 7 and competition between Turing and Hopf modes in the chlorite-iodide-malonic acid reaction 8 have been successfully analyzed with the aid of the Brusselator.…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Packet and Trigger Waves Originating from a Finite Wavelength Instability

Vanag

Epstein

2002

J. Phys. Chem. A

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The finite wavelength instability generates trigger and packet waves in an extended three-variable Brusselatortype model. The trigger waves account for experimentally observed stacking (shock) structures and acceleration of oncoming waves before collision observed in the Belousov-Zhabotinsky system. Packet waves exhibit specular reflection from surfaces. The mouth of a narrow tube connected to a broader region acts as a semitransparent mirror for packet waves leaving the tube, with a coefficient of transparency that depends on the tube radius.

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Photosensitive, Bubble-free, Bromate−1,4-Cyclohexanedione Oscillating Reactions. Illumination Control of Pattern Formation

Cited by 42 publications

References 15 publications

Propagating Spiral Waves Obtained in a Catalyst-Immobilized Gel Membrane by the Belousov-Zhabotinsky Reaction System

Propagating Spiral Waves Obtained in a Catalyst-Immobilized Gel Membrane by the Belousov-Zhabotinsky Reaction System

Dinâmica complexa no sistema bromato/hipofosfito/acetona/manganês e ferroína

Comparative Analysis of Packet and Trigger Waves Originating from a Finite Wavelength Instability

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