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How imperfect mixing and differential diffusion accelerate the rate of nonlinear reactions in microfluidic channels

  • In this paper, we show experimentally that inside a microfluidic device, where the reactants are segregated, the reaction rate of an autocatalytic clock reaction is accelerated in comparison to the case where all the reactants are well mixed. We also find that, when mixing is enhanced inside the microfluidic device by introducing obstacles into the flow, the clock reaction becomes slower in comparison to the device where mixing is less efficient. Based on numerical simulations, we show that this effect can be explained by the interplay of nonlinear reaction kinetics (cubic autocatalysis) and differential diffusion, where the autocatalytic species diffuses slower than the substrate.

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Author:Robert Niedl, Igal Berenstein, Carsten BetaORCiDGND
ISSN:1463-9076 (print)
ISSN:1463-9084 (online)
Parent Title (English):Physical chemistry, chemical physics : PCCP ; a journal of European Chemical Societies
Publisher:Royal Society of Chemistry
Place of publication:Cambridge
Document Type:Article
Date of first Publication:2016/02/10
Year of Completion:2016
Publishing Institution:Universität Potsdam
Release Date:2016/09/15
Tag:arsenious acid; fronts; paper; poly(dimethylsiloxane); scale; systems
First Page:6451
Last Page:6457
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Chemie
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 54 Chemie / 540 Chemie und zugeordnete Wissenschaften
Peer Review:Referiert
Publication Way:Open Access
Licence (English):License LogoCreative Commons - Attribution 3.0 Unported
Notes extern:Zweitveröffentlichung in der Schriftenreihe Postprints der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe ; 253