Reaction dynamics and chemical pattern formation in capillary tubes resulting from the competition between two elementary complex formation reactions

Anna L. Lin, Andrew Yen, Yong Eun Lee Koo, Baruch Vilensky, Haim Taitelbaum, Raoul Kopelman

Research output: Contribution to journalConference articlepeer-review

Abstract

A system of competing elementary reactions is investigated experimentally using the reaction of xylenol orange with Cr3+ in aqueous solution. The two reagents are initially separated in a long, thin capillary tube and meet in the center, forming a reaction front (s). The geometry of the reactor and the initial separation of the reagents makes the system effectively one-dimensional. Aqueous Cr3+ solution has a very rich chemistry and provides two different chemical Cr3+ reactants which compete to react with xylenol orange. Rich spatio-temporal patterns are observed experimentally and are explained by a reaction-diffusion model. Results from exact enumeration simulations predict that when the concentrations of the competing species are very different and the microscopic rate constants of the competing species are such that the majority species reaction rate is much faster than the reaction rate of the minority species, the reaction front splits into two distinct regions. The spatio-temporal patterns generated by theory and experiment agree quantitatively. Also in agreement with the theory are the experimental early time and asymptotic time global rate behaviors, which exhibit multiple crossovers.

Original languageEnglish
Pages (from-to)251-256
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume464
StatePublished - 1997
Externally publishedYes
EventProceedings of the 1996 MRS Fall Meeting - Boston, MA, USA
Duration: 2 Dec 19965 Dec 1996

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