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Well-controllable experiments in chemical reaction-diffusion systems have up to now been realized in three ways. First, gel reactors or filled capillary tubes may be used. Second, temperature pulses on catalytic surfaces have been investigated.
Mathematics and the modeling of reaction-diffusion processesLiesegang patterning is a special type of chemical pattern formation in which the spatial order is formed by density fluctuations of a weakly soluble salt ...... accidentally dropped a small crystal of silver-nitrate onto a specimen, and was astonished that the precipitate formed concentric rings about it.