Dynamic evolution of the oscillatory Belousov–Zhabotinsky reaction upon addition of a non-ionic polymer

Sciascia, Luciana; Lombardo, Renato; Liveri, Maria Liria Turco

doi:10.1016/j.cplett.2006.08.003

Cited by 7 publications

(11 citation statements)

References 12 publications

(20 reference statements)

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“…6,7 The combination of a chemical oscillator with peculiar reaction environments is a subject extensively studied during the past years. In particular, examples about BZ reaction include gels, 8 synthetic membranes, 9 ion-exchange resins, 10 micelles, 11,12 polymers, 13,14 water in oil reverse microemulsions, 15,16 and lipid bilayers. 17,18 Among the above-mentioned modifying reaction media, surfactant forming micelles revealed to be very intriguing and promising.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, due to its surface activity properties, SDS has often been used to favor the spreading of BZ mixtures over glass Petri dishes in order to create thin solution layers (almost two-dimensional). [20][21][22] Systematic studies [11][12][13][14] dealing with the effect of organized systems have been recently undertaken in our group to both elucidate the reaction mechanism and to observe the appearance, if any, of new nonlinear phenomena. In particular, the presence of SDS, both below and above critical micelles concentration (cmc, the concentration at which micelles are formed), influences the temporal dynamics of closed stirred BZ systems.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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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“…Among the model systems that have attracted the attention of researchers, the oscillating reaction of Belousov-Zhabotinsky (BZ) is one of the most extensively studied. [1][2][3][4][5][6][7] In fact, the first study was undertaken in order to mimic the Krebs cycle. In its "classic" version, the BZ reaction consists of the bromuration and oxidation of an organic substrate (the malonic acid) in strongly acidic medium, in the presence of a catalyst (one electron redox couple, usually the system Ce(IV)/Ce(III) or Ferroin/Ferriin).…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Response of a Batch BZ Oscillator to the Addition of the Anionic Surfactant Sodium Dodecyl Sulfate

2007

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The response of the Belousov-Zhabotinsy (BZ) system to the addition of increasing amounts of the anionic surfactant sodium dodecyl sulfate (SDS) was monitored at 25.0°C in stirred batch conditions. The presence of SDS in the reaction mixture influences the oscillatory parameters, i.e., induction period and oscillation period, to an extent that depends on the surfactant concentration. The experimental results have shown that the induction period increases slightly on increasing surfactant concentration and, then, a further increase in the [SDS] leads to an enhancement while the oscillation period increases monotonously on increasing SDS concentration. It has been proposed that the response of the oscillatory BZ system to the addition of SDS is due to the peculiar capability of the organized surfactant assemblies to affect the reactivity by selectively sequestering some key reacting species. Indeed, explanations of the experimental results have been given on the basis of the role played by the micellar shape, which in turn dictates the hydrophobic nature. The suggested perturbation effects have been supported by performing viscosity measurements on the aqueous SDS solutions and by the spectrophotometric estimation of the binding constant of the bromine species to the micellar aggregates. This study has indirectly corroborated the existence of two kind of micelles and unambiguously revealed that the bromine species show a different affinity toward the spherical and rod-like micelles.

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“…The experimental observations reveal that the presence of the OH group containing perturbants in general leads to variation of oscillation parameters by active participation in a reaction network . The involvement of OH groups in the BZ reaction has been confirmed by the addition of methanol and ethylene glycol to the BZ system . Therefore, the impact of Brij58 on dynamics of the BZ reaction could be explained by taking into account reactions of terminal OH groups.…”

Section: Resultsmentioning

confidence: 81%

“…Surfactant‐forming micelles (direct and reverse) revealed to be very fascinating and promising due to their ability to selectively interact via electrostatic and/or hydrophobic interactions with the reaction substrates or products present in the medium . The works of Liveri et al and others have exhaustively demonstrated the effects of different types of self‐assembled additives such as surfactants and/or polymers on the oscillatory parameters of the BZ oscillatory reaction such as an induction period and oscillation time period . However, the literature has scarcely highlighted the role of mixed surfactant systems on the dynamics of the BZ oscillatory reaction.…”

Section: Introductionmentioning

confidence: 99%

Influence of Micellar Propinquity on Dynamics of Ce(IV)‐Catalyzed BZ Oscillatory Reaction under Stirred Conditions

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Najar

Ashraf

et al. 2014

Int J of Chemical Kinetics

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Oscillating reactions often employed to mimic and understand complex dynamics in biological systems are known to be affected in aggregated host environments. The dynamic evolution of the oscillatory Belousov–Zhabotinsky (BZ) reaction upon addition of increasing amounts of anionic (sodium dodecylbenzenesulfonate; SDBS), cationic (hexadecyltrimethylammonium bromide; CTAB), nonionic (polyoxyethylene(20) cetyl ether; Brij58), and binary mixtures (CTAB + Brij58 and SDBS + Brij58) of surfactants was monitored using potentiometry at 25 and 35°C under stirred batch conditions. The experimental results reveal that the oscillatory parameters of the Ce(IV)‐catalyzed BZ reaction are significantly altered depending on the concentration and nature of restricted micellar host environments. In the presence of ionic surfactants, it is proposed that the evolution of the oscillatory BZ system may be due to atypical proficiency (related to hydrophobic and electrostatic interactions) of such organized self‐assemblies to affect the reactivity by selectively confiscating some key reacting species. However, the response of the BZ system to nonionic Brij58 was attributed to the reaction among the alcoholic functional groups of the surfactant with some vital species of the BZ reaction. Moreover, the nonionic + ionic binary surfactant systems exhibited behaviors representative of both the constitutive single surfactant systems.

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Dynamic evolution of the oscillatory Belousov–Zhabotinsky reaction upon addition of a non-ionic polymer

Cited by 7 publications

References 12 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

Nonlinear Response of a Batch BZ Oscillator to the Addition of the Anionic Surfactant Sodium Dodecyl Sulfate

Influence of Micellar Propinquity on Dynamics of Ce(IV)‐Catalyzed BZ Oscillatory Reaction under Stirred Conditions

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