Pattern Formation and Self-Organization in a Simple Precipitation System

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• 作者：Andr&aacute ; s Volford ; Ferenc Izs&aacute ; k ; M&aacute ; ty&aacute ; s Ripsz&aacute ; m ; Istv&aacute ; n Lagzi
• 刊名：Langmuir
• 出版年：2007
• 出版时间：January 30, 2007
• 年：2007
• 卷：23
• 期：3
• 页码：961 - 964
• 全文大小：232K
• 年卷期：v.23,no.3(January 30, 2007)
• ISSN：1520-5827

文摘

Various types of pattern formation and self-organization phenomena can be observed in biological, chemical, andgeochemical systems due to the interaction of reaction with diffusion. The appearance of static precipitation patternswas reported first by Liesegang in 1896. Traveling waves and dynamically changing patterns can also exist in reaction-diffusion systems: the Belousov-Zhabotinsky reaction provides a classical example for these phenomena. Until now,no experimental evidence had been found for the presence of such dynamical patterns in precipitation systems. Patternformation phenomena, as a result of precipitation front coupling with traveling waves, are investigated in a new simplereaction-diffusion system that is based on the precipitation and complex formation of aluminum hydroxide. A uniquekind of self-organization, the spontaneous appearance of traveling waves, and spiral formation inside a precipitationfront is reported. The newly designed system is a simple one (we need just two inorganic reactants, and the experimentalsetup is simple), in which dynamically changing pattern formation can be observed. This work could show a newperspective in precipitation pattern formation and geochemical self-organization.