A tomographic study of desynchronization and complex dynamics of scroll waves in an excitable chemical reaction with a gradient
Literature Information
Camilo Rodrigues Neto, Markus Bär
The evolution of scroll waves in an excitable chemical medium with a gradient parallel to the scroll filament is studied. Depending on the excitability and the gradient, twisted scroll waves and scroll wave attachment to the boundary of the reaction volume are observed by optical tomography, which allows the full three-dimensional reconstruction of the vortex structure in the Belousov–Zhabotinsky reaction as well as estimates on the shape and dynamics of the organizing center of the scroll (the filament). This behavior is reproduced in numerical simulations with the generic Barkley model for excitable media supplemented by a gradient along the filament. In particular, the study deals with scroll waves in a cylindrical reaction system with a free surface open to the air. Oxygen penetrating through the free surface inhibits the evolution of waves and establishes a twist of the filament. Cooling of the reaction system enhances this twist, eventually leading to a bending of the initially straight filament. Finally, the bending becomes so pronounced that the filament touches the container boundary and breaks into two pieces, each of which has its distinct rotation frequency.
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Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











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