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DY: Fachverband Dynamik und Statistische Physik

DY 44: Focus Session: Wetting on Adaptive Substrates II (joint session CPP/DY/O)

DY 44.4: Talk

Thursday, March 21, 2024, 12:30–12:45, H 0107

Chemical reactions confined in liquid films: dynamics and stability — •Tilman Richter¹, Paolo Malgaretti¹, Thomas M. Koller², and Jens Harting¹ — ¹Forschungszentrum Jülich GmbH, Helmholtz-Institut Erlangen-Nürnberg für Erneuerbare Energien (IEK-11), Cauerstr. 1, 91058 Erlangen, Germany — ²Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP), Department of Chemical and Biological Engineering (CBI) and Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universit Erlangen-Nuernberg (FAU), Paul-Gordan-Straße 8, 91052 Erlangen, Germany

In catalytic reactions occurring within small liquid droplets or thin liquid films, the yield significantly differs from that in bulk reactions. This variance is primarily due to the fluid interface's substantial surface-to-volume ratio. The fluid interface initiates several phenomena, such as increased surface diffusion, Marangoni flows, and more effective surface interactions, which can boost yield substantially. We develop a theoretical model that demonstrates that the uneven distribution of reactants and products, caused by chemical reactions, can induce Marangoni flows. These flows then alter the spatial distribution of the catalyst. This complex interaction offers novel methods for either inhibiting or promoting the rupture of thin films, as well as for modifying the shape of small droplets.

Keywords: Lubrication; Wetting; Catalysis in Confinement; Supported Liquid Phase Catalysis; Lattice Boltzman Method