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Related Experiment Videos

Wave initiation through spatiotemporally controllable perturbations.

J Wolff1, A G Papathanasiou, H H Rotermund

  • 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany.

Physical Review Letters
|May 7, 2003
PubMed
Summary

We investigated how localized heat pulses initiate reaction-diffusion waves on a catalyst surface. Subcritical perturbations cooperatively triggered waves in both excitable and bistable regimes, revealing new insights into catalytic processes.

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Area of Science:

  • Surface science
  • Chemical kinetics
  • Reaction-diffusion systems

Background:

  • Catalytic reactions like CO oxidation on Platinum are crucial industrial processes.
  • Understanding pattern formation, such as pulses and fronts, is key to controlling reaction dynamics.
  • Reaction-diffusion systems exhibit complex behaviors like excitability and bistability.

Purpose of the Study:

  • To investigate the initiation of reaction-diffusion waves (pulses and fronts) on a two-dimensional catalytic surface.
  • To explore the cooperativity of localized temperature perturbations in triggering these waves.
  • To rationalize experimental observations through computational modeling.

Main Methods:

  • Utilizing a computer-controlled mobile focused laser beam to apply localized temperature 'kicks' in space and time.

Related Experiment Videos

  • Studying the CO oxidation reaction on a Pt(110) surface, a model catalytic system.
  • Employing computational modeling to understand the underlying mechanisms.

    • Main Results:

    • Demonstrated that individually subcritical temperature perturbations can cooperatively initiate waves.
    • Observed wave initiation in both the excitable and bistable regimes of the reaction.
    • Rationalized the observed phenomena through modeling, confirming the role of perturbation cooperativity.

    Conclusions:

    • Localized thermal perturbations can effectively control the initiation of reaction-diffusion waves.
    • The cooperativity of subcritical perturbations is a significant factor in pattern formation on catalytic surfaces.
    • This study provides a fundamental understanding of wave initiation in catalytic systems, relevant for process optimization.