Probability of the Emergence of Helical Precipitation Patterns in the Wake of Reaction-Diffusion Fronts

Thomas, Shibi and Lagzi, István László and Jr. Molnár, Ferenc and Rácz, Zoltán (2013) Probability of the Emergence of Helical Precipitation Patterns in the Wake of Reaction-Diffusion Fronts. PHYSICAL REVIEW LETTERS, 110 (7). pp. 1-7. ISSN 0031-9007

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Abstract

Helical and helicoidal precipitation patterns emerging in the wake of reaction-diffusion fronts are studied. In our experiments, these chiral structures arise with well-defined probabilities P-H controlled by conditions such as, e. g., the initial concentration of the reagents. We develop a model which describes the observed experimental trends. The results suggest that P-H is determined by a delicate interplay among the time and length scales related to the front and to the unstable precipitation modes and, furthermore, that the noise amplitude also plays a quantifiable role.

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