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Issue 48, 2017
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Control of chemical chaos through medium viscosity in a batch ferroin-catalysed Belousov–Zhabotinsky reaction

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Abstract

In this paper we show that the active interplay of nonlinear kinetics and transport phenomena in a chemical oscillator can be exploited to induce and control chaos. To this aim we use as a model system the ferroin-catalysed Belousov–Zhabotinsky (BZ) oscillating reaction, which is known to evolve to characteristic chaotic transient dynamics when carried out under batch and unstirred conditions. In particular, chemical chaos was found to appear and disappear by following a Ruelle–Takens–Newhouse (RTN) scenario. Here we use medium viscosity as a bifurcation parameter to tune the reaction–diffusion–convection (RDC) interplay and force the reaction in a specific sequence of dynamical regimes: either (i) periodic → quasi-periodic → chaotic or (ii) periodic → quasi-periodic or (iii) only periodic. The medium viscosity can be set by adding different amounts of surfactant (sodium dodecyl sulphate), known to have a little impact on the reaction mechanism, above its critical micelle concentration. Experimental results are supported by means of numerical simulations of a RDC model, which combines self-sustained oscillations to the related chemically-induced buoyancy convection.

Graphical abstract: Control of chemical chaos through medium viscosity in a batch ferroin-catalysed Belousov–Zhabotinsky reaction

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Article information


Submitted
27 Sep 2017
Accepted
16 Nov 2017
First published
16 Nov 2017

Phys. Chem. Chem. Phys., 2017,19, 32235-32241
Article type
Paper

Control of chemical chaos through medium viscosity in a batch ferroin-catalysed Belousov–Zhabotinsky reaction

M. A. Budroni, I. Calabrese, Y. Miele, M. Rustici, N. Marchettini and F. Rossi, Phys. Chem. Chem. Phys., 2017, 19, 32235
DOI: 10.1039/C7CP06601E

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