Guiding chemical pulses through geometry: Y junctions

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L. Qiao and I. G. Kevrekidis
Department of Chemical Engineering, Princeton University, Princeton, New Jersey 08544, USA

C. Punckt and H. H. Rotermund
Fritz-Haber-Institut der MPG, Faradyweg 4-6, 14195 Berlin, Germany

Received 8 December 2005; published 29 March 2006

Westudy computationally and experimentally the propagation of chemical pulses incomplex geometries. The reaction of interest, CO oxidation, takes placeon single crystal Pt(110) surfaces that are microlithographically patterned; theyare also addressable through a focused laser beam, manipulated throughgalvanometer mirrors, capable of locally altering the crystal temperature andthus affecting pulse propagation. We focus on sudden changes inthe domain shape (corners in a Y-junction geometry) that canaffect the pulse dynamics; we also show how brief, localizedtemperature perturbations can be used to control reactive pulse propagation.The computational results are corroborated through experimental studies in whichthe pulses are visualized using reflection anisotropy microscopy.

URL:	http://link.aps.org/doi/10.1103/PhysRevE.73.036219
DOI:	10.1103/PhysRevE.73.036219
PACS:	05.45.-a; 82.40.Ck; 82.40.Np 05.45.-a Nonlinear dynamics and nonlinear dynamical systems 82.40.Ck Pattern formation in chemical reactions with diffusion, flow and heat transfer 82.40.Np Temporal and spatial patterns in surface chemical reactions YEAR: 2006
KEYWORDS:	platinum, catalysts, catalysis, carbon compounds, oxidation, surface chemistry, pattern formation, lithography

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