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Spatially Localized Chemical Patterns around an A + B → Oscillator Front
M A Budroni1, L Lemaigre2, D M Escala3
1Department of Chemistry and Pharmacy, University of Sassari , 07100 Sassari, Italy.
The Journal of Physical Chemistry. A
|January 5, 2016
Summary
Interactions between chemical fronts and waves in the Belousov-Zhabotinsky reaction create complex patterns. The system’s initial dynamics dictate the resulting spatiotemporal evolution and patterns observed.
Area of Science:
- Chemical kinetics
- Nonlinear dynamics
- Pattern formation
Background:
- Oscillatory reactions in gels can form complex spatiotemporal patterns like waves and Turing patterns.
- Reactant separation in gels localizes different dynamical regimes of chemical oscillators.
Purpose of the Study:
- To investigate numerically and experimentally the composite traveling structures formed by interacting chemical fronts and waves.
- To analyze the influence of initial reactant concentrations on the dynamics of the Belousov-Zhabotinsky reaction.
Main Methods:
- Numerical simulations of reaction-diffusion systems.
- Experimental studies using the Belousov-Zhabotinsky (BZ) oscillating reaction in gels.
- Systematic variation of the initial concentration of the organic substrate to control excitability.
Main Results:
- Observed transitions between different dynamical regimes (excitable and oscillatory) by altering initial conditions.
- Demonstrated that the initial dynamical regime of the BZ oscillator is critical for spatiotemporal pattern evolution.
- Experimental findings qualitatively align with theoretical predictions.
Conclusions:
- The initial state of the chemical oscillator significantly influences pattern formation in reaction-diffusion systems.
- Understanding the interplay between excitability and oscillation is key to predicting complex chemical dynamics.
- This study provides insights into controlling and predicting spatio-temporal patterns in chemical oscillators.
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