title: Interactive propagation of photosensitive chemical waves on two circular routes.
abstract: The propagation of chemical waves in the photosensitive Belousov-Zhabotinsky (BZ) reaction was investigated using an excitable field composed of two rings in slight contact, which were drawn using computer software and then projected on a film soaked with BZ solution using a liquid-crystal projector. When the initial phase difference between the two chemical waves in the individual rings was smaller than a critical value, this initial value was maintained after collision of the chemical waves. However, when the initial phase difference was larger than this critical value, the phase difference converged to the same value after the second collision. The critical value increased with an increase in the thickness of the rings. These experimental results on the geometry of the excitable field are discussed in relation to the nature of chemical wave propagation. These results suggest that the photosensitive BZ reaction may be useful for creating spatiotemporal patterns that depend on the geometric arrangement of excitable fields.
authors.affiliation: Department of Chemistry, Nara University of Education, Takabatake-cho, Nara 630-8528, Japan. nakatas@nara-edu.ac.jp
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakata
authors.forename: Sayaka
authors.initials: S
authors.lastname: Morishima
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kitahata
mesh_terms: D015082:2,2'-Dipyridyl / Q000031:analogs & derivatives* / Q000737:chemistry / Q000528:radiation effects; D001959:Bromates / Q000737:chemistry; D001965:Bromides / Q000737:chemistry; D003198:Computer Simulation; D056831:Coordination Complexes; D005456:Fluorescent Dyes / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D008956:Models, Chemical; D010777:Photochemistry; D013696:Temperature; D013997:Time Factors; D017975:Ruthenium Compounds
chemical_list: D015082:2,2'-Dipyridyl; D001959:Bromates; D001965:Bromides; D056831:Coordination Complexes; D005456:Fluorescent Dyes; C547232:tris(2,2-bipyridine)-ruthenium(II); D017975:Ruthenium Compounds