Berlin 2012 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 7: Reaction-Diffusion-Systems

DY 7.3: Vortrag

Montag, 26. März 2012, 17:15–17:30, MA 144

Speed-up of a clock reaction with microfluidic methods — •Robert Niedl, Igal Berenstein, and Carsten Beta — Biological Physics, Universität Potsdam, Germany

The focus of our research is a combination of nonlinear kinetics and microfluidics to amplify chemical input signals. We study the dynamics of the autocatalytic iodate-arsenite reaction in PDMS-based microfluidic devices under continuous flow conditions. If a critical amount of initializer is present, a reaction is triggered by a nonlinear autocatalytic process. In our experimental setup two different scenarios are implemented to initiate the reaction. On the one hand, we use diffusive micromixing to systematically investigate the kinetics of the clock depending on the various input concentrations, flow velocities, and fluid viscosities. On the other hand, we introduce a Pt electrode into the microchannel that acts as a local chemical source in the flow. This setup allows us to explore the interplay of mixing kinetics and nonlinear reaction that may lead to accelerated reaction rates in specific microfluidic configurations.