Propagation of photosensitive chemical waves on the circular routes.
The propagation of chemical waves in the photosensitive Belousov-Zhabotinsky (BZ) reaction was investigated using an excitable field in the shape of a circular ring or figure "8" that was drawn by computer software and then projected on a film soaked with BZ solution using a liquid-crystal projector. For a chemical wave in a circular reaction field, the shape of the chemical wave was investigated depending on the ratio of the inner and outer radii. When two chemical waves were generated on a field shaped like a figure "8" (one chemical wave in each circle) as the initial condition, the location of the collision of the waves either was constant or alternated depending on the degree of overlap of the two circular rings. These experimental results were analyzed on the basis of a geometrical discussion and theoretically reproduced on the basis of a reaction-diffusion system using a modified Oregonator model. These results suggest that the photosensitive BZ reaction may be useful for creating spatio-temporal patterns depending on the geometric arrangement of excitable fields.
Kitahata
Hiroyuki
H
Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan.
Yamada
Akiko
A
Nakata
Satoshi
S
Ichino
Takatoshi
T
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; D008027:Light; D008314:Malonates / Q000737:chemistry; D008956:Models, Chemical; D010777:Photochemistry; D017680:Potassium Compounds / Q000737:chemistry; D017670:Sodium Compounds / Q000737:chemistry; D013464:Sulfuric Acids / Q000737:chemistry; D013696:Temperature; D013997:Time Factors; D017975:Ruthenium Compounds
D015082:2,2'-Dipyridyl; D001959:Bromates; D001965:Bromides; D056831:Coordination Complexes; D008314:Malonates; D017680:Potassium Compounds; D017670:Sodium Compounds; D013464:Sulfuric Acids; C547232:tris(2,2-bipyridine)-ruthenium(II); D017975:Ruthenium Compounds; C030290:malonic acid; C033158:sulfuric acid; C039004:potassium bromide; C060553:sodium bromate