Regensburg 2013 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 33: Poster II
DY 33.41: Poster
Donnerstag, 14. März 2013, 17:00–19:00, Poster C
Local coupling of non-linear oscillators studied in the Bhelousov-Zhabotinsky reaction — •Claudia Lenk1, Mario Einax2, Philipp Maass2, and Michael J Köhler1 — 1Institut für Chemie und Biotechnik, Technische Universität Ilmenau, Germany — 2Fachbereich Physik, Universität Osnabrück, Germany
Pattern formation in reaction-diffusion (RD) systems is important in many areas as, e.g., the embryonic development, catalytic activity or population dynamics. These systems are mostly constituted of many coupled subunits, like the cells of the embryo or catalyst nanoparticles. To get insight into the influence of these modular structure onto the emerging excitation patterns we conduct experiments of the Bhelousov-Zhabotinsky reaction (BZR) in a Nafion membran with a catalyst distribution in form of a micro spots pattern and compare the BZR waves with numerical calculations of the FitzHugh-Nagumo equations.
The influence of the catalyst spot size, their distance and shape on the coupling strength was investigated. We observe a bifurcation into two different patterns, i.e. a spiral wave and a target pattern, in dependence of the distance of catalyst spots. Thereby the initial conditions control which pattern occurs. In further studies, we will investigate the possibility to predict which pattern occurs if only the initial conditions are known.