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Experimental Study of a Reaction-Diffusion System in a Capillary: Complex Behavior of a Seemingly Simple System

Published online by Cambridge University Press:  15 February 2011

Anna Lin ,
Andrew Yen ,
Yong-Eun Koo  and
Raoul Kopelman
Anna Lin
Affiliation:
University of Michigan, Ann Arbor, MI. 48109.
Andrew Yen
Affiliation:
University of Michigan, Ann Arbor, MI. 48109.
Yong-Eun Koo
Affiliation:
University of Michigan, Ann Arbor, MI. 48109.
Raoul Kopelman
Affiliation:
University of Michigan, Ann Arbor, MI. 48109.
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Abstract

We study a reaction-diffusion system within the confines of a thin capillary tube. Xylenol orange and Cr 3+ are introduced into a capillary tube from opposite ends and meet in the middle forming a reaction front. Unequal initial concentrations of the reactants causes the center of the reaction front to move in time. Characteristics of the front such as the width of the reaction zone, w, the position of the center of the front, xf, the global reaction rate, R, and the local reaction rate, r(xf,t) are determined by continuously monitoring the product concentration in space vs. time. We observe crossover of the global rate from classical to non-classical behavior and a splitting of the reaction front.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 366: Symposium N – Dynamics in Small Confining Systems , 1994 , 389
Copyright
Copyright © Materials Research Society 1995

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