Abstract
An experimental study of chemical waves in the Belousov-Zhabotinsky reaction under anisotropic conditions of substrate concentrations extending over the system was carried out by use of ferroin-immobilized silica gels as reacting matrices. Unidirectionally moving wave trains (similar to the so-called “chemical pinwheels”) followed by the spontaneous fragmentation of wave fronts were observed in rectangular two-dimensional gels. A helicoidal chemical wave (or twisted scroll wave), which was predicted by numerical calculation, was detected in a micro-cylindrical gel system. A space-time representation of the chemical helix was constructed and its structural features are discussed qualitatively.
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