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Role of the reagents consumption in the chaotic dynamics of the Belousov–Zhabotinsky oscillator in closed unstirred reactors

Marchettini, Nadia and Budroni, Marcello Antonio and Rossi, Federico and Masia, Marco and Turco Liveri, Maria Liria and Rustici, Mauro (2010) Role of the reagents consumption in the chaotic dynamics of the Belousov–Zhabotinsky oscillator in closed unstirred reactors. Physical Chemistry Chemical Physics, Vol. 12 (36), p. 11062-11069. eISSN 1463-9084. Article.

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DOI: 10.1039/C0CP00109K

Abstract

Chemical oscillations generated by the Belousov–Zhabotinsky reaction in batch unstirred reactors, show a characteristic chaotic transient in their dynamical regime, which is generally found between two periodic regions. Chemical chaos starts and finishes by following a direct and an inverse Ruelle–Takens–Newhouse scenario, respectively. In previous works we showed, both experimentally and theoretically, that the complex oscillations are generated by the coupling among the nonlinear kinetics and the transport phenomena, the latter due to concentration and density gradients. In particular, convection was found to play a fundamental role. In this paper, we develop a reaction–diffusion–convection model to explore the influence of the reagents consumption (BrO3 in particular) in the inverse transition from chaos to periodicity. We demonstrated that, on the route towards thermodynamic equilibrium, the reagents concentration directly modulates the strength of the coupling between chemical kinetics and mass transport phenomena. An effective sequential decoupling (reaction–diffusion–convection → reaction–diffusion → reaction) takes place upon the reagents consumption and this is at the basis of the transition from chaos to periodicity.

Item Type:Article
ID Code:7768
Status:Published
Refereed:Yes
Uncontrolled Keywords:Belousov–Zhabotinsky (BZ) reaction, reagents consumption, chaotic dynamics
Subjects:Area 03 - Scienze chimiche > CHIM/02 Chimica fisica
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > SLACS-Sardinian Laboratory for Computational Materials Science, Cagliari
002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche
002 Altri enti e centri di ricerca del Nord Sardegna > INSTM-Consorzio Interuniversitario Nazionale per la Scienza e la Tecnologia dei Materiali, Unità di ricerca di Sassari
001 Università di Sassari > 01 Dipartimenti > Chimica
Publisher:Royal Society of Chemistry
eISSN:1463-9084
Copyright Holders:© the Owner Societies 2010
Deposited On:12 Jul 2012 13:31

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