Oscillatory dynamics of the Belousov–Zhabotinsky system in the presence of a self-assembling nonionic polymer. Role of the reactants concentration

Sciascia, Luciana; Rossi, Federico; Sbriziolo, Carmelo; Liveri, Maria Liria Turco; Varsalona, R.

doi:10.1039/c003033c

Cited by 23 publications

(14 citation statements)

References 41 publications

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“…The fate of IP is, therefore, decided by a compromise between production of HOBr (MBM2) and pathways involving reactions (MBM6) and (MBM7). It is apropos to mention that at higher Ce(IV) concentration (5 × 10 −3 mol dm −3 ), reaction (MBM2) predominates, whereas at lower concentrations (8 × 10 −4 mol dm −3 ) reactions (MBM6) and (MBM7) predominate . Since in the present study, the concentration of Ce(IV) used is 5 × 10 −3 mol dm −3 , the production of HOBr via reaction (MBM2) is expected to predominate.…”

Section: Resultsmentioning

confidence: 59%

“…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%

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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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Section: Resultsmentioning

confidence: 59%

Section: Resultsmentioning

confidence: 81%

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

Chat

Najar

Ashraf

et al. 2014

Int J of Chemical Kinetics

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“…It is clear that the presence of polymer delays the oscillatory reaction subpath of the B-Z reaction. [22] At the beginning the amplitude was almost the same as that of a pure B-Z oscillation. However, in our situation, it gradually decreases as time elapses.…”

mentioning

confidence: 85%

Facile One‐Pot Synthesis of Functional Giant Polymeric Vesicles Controlled by Oscillatory Chemistry

Bastakoti

Pérez–Mercader

2017

Angew Chem Int Ed

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We introduce a novel application of an oscillatory chemical reaction to the synthesis of block copolymers. The Belousov-Zhabotinsky (B-Z) reaction is coupled with the polymerization of an amphiphilic block copolymer. Radicals generated in the B-Z reaction initiate the polymerization between a polyethylene glycol (PEG) macroreversible addition-fragmentation chain-transfer agent and butyl acrylate monomers. The attachment of a hydrophobic block on PEG leads to self-assembly and formation of spherical micelles. The nanoscale micelles transform into submicrometer vesicles and grow to giant vesicles as a consequence of the oscillatory behavior of the B-Z reaction. The one-pot synthesis of an amphiphilic di-block copolymer and retention of oscillatory behavior for the B-Z reaction with the formation of giant vesicles bring a new insight into possible pathways for the synthesis of active functional microreactors in the range from hundreds of nanometers to tens of micrometers.

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“…The dynamics of the well known BZ 1,2 chemical oscillator, in particular, has been studied with many self-assembled matrices 3 and structured media 4 including gels and hydrogels, 5-8 micelles, [9][10][11][12][13][14] polymers, [15][16][17][18] and lipid vesicles and aggregates. [19][20][21][22][23][24] Particularly important from the pattern formation viewpoint, the AOT water-in-oil reverse MEs, are probably the most thoroughly studied system in combination with the BZ reaction.…”

Section: Introductionmentioning

confidence: 99%

Interfacial hydrodynamic instabilities driven by cross-diffusion in reverse microemulsions

Budroni

Landeira

Intiso

et al. 2015

Chaos: An Interdisciplinary Journal of Nonlinear Science

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When two microemulsions are put in contact in the gravity field along a horizontal contact line, cross-diffusion can trigger the transport of one species in the presence of a gradient in concentration of another species. We show here theoretically that such cross-diffusion effects can induce buoyancy-driven convective instabilities at the interface between two solutions of different compositions even when initially the less dense solution lies on top of the denser one. Two different sources of convective modes are identified depending whether positive or negative cross-diffusion is involved. We evidence the two predicted cross-diffusion driven instabilities experimentally using a two-layer stratification of Aerosol-OT (AOT) water-in-oil microemulsions solutions with different water or AOT composition.

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Oscillatory dynamics of the Belousov–Zhabotinsky system in the presence of a self-assembling nonionic polymer. Role of the reactants concentration

Cited by 23 publications

References 41 publications

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

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

Facile One‐Pot Synthesis of Functional Giant Polymeric Vesicles Controlled by Oscillatory Chemistry

Interfacial hydrodynamic instabilities driven by cross-diffusion in reverse microemulsions

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