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O: Fachverband Oberflächenphysik
O 45: Mini-Symposium: Molecular scale investigations of liquid-vapor interfaces I
O 45.3: Talk
Tuesday, March 2, 2021, 14:20–14:40, R3
Chemical kinetics at the water-water interface of a liquid flat-jet — •Hanns Christian Schewe1, Bruno Credidio2, Aaron Ghrist1,3, Sebastian Malerz1, Christian Ozga4, Henrik Haak1, Gerard Meijer1, Bernd Winter1, and Andreas Osterwalder2 — 1Fritz-Haber-Institut der Max-Planck-Gesellschaft, Department of Molecular Physics, Faradayweg 4-6, D-14195 Berlin, Germany — 2Institute for Chemical Sciences and Engineering (ISIC), Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland — 3Department of Chemistry, University of Southern California, Los Angeles, CA 90089-0482, USA — 4Institut für Physik und CINSaT, Universität Kassel, Heinrich-Plett-Strasse 40, 34132 Kassel, Germany
Two colliding cylindrical microjets from aqueous solutions are used to produce a planar leaf-shaped flowing sheet. Using jets from two different aqueous solutions, each containing a reactant for a fast chemiluminescence reaction, we image the emitted photons to spatially visualize the mixing of the solutions at any position of the leaf. Diffusion across the planar liquid-liquid interface leads to mixing of chemical species from the two solutions, allowing for chemical reactions and their detection. Such a micrometer-thin flowing two solution structure offers novel opportunities for spectroscopic and kinetic studies at liquid-liquid interfaces. We present a quantitative model that describes diffusion-limited reaction kinetics at the liquid-liquid interface, which can also be extended to account for interactions at the liquid-vapour interface.