Anisotropic waves propagating on two-dimensional arrays of Belousov-Zhabotinsky oscillators

A new photolithographic method was developed to enable precise patterning o f a catalyst on a cation-exchange membrane. A large number of catalyst (fer roin) dots were arranged on triangular and square lattices to study pattern formation on a two-dimensional array of Belousov-Zhabotinsky (BZ) oscillat ors. When the distances among the dots were adjusted properly, the propagat ion of anisotropic chemical waves was experimentally observed in the discre te BZ reaction systems.