Papers › Chemically reactive thin films: dynamics and stability
Chemically reactive thin films: dynamics and stability
Tilman Richter, Paolo Malgaretti, Thomas M. Koller, Jens Harting
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Catalyst particles or complexes suspended in liquid films can trigger chemical reactions leading to inhomogeneous concentrations of reactants and products in the film. We demonstrate that the sensitivity of the liquid film's gas-liquid surface tension to these inhomogeneous concentrations strongly impacts the film stability. Using linear stability analysis, we identify novel scenarios in which the film can be either stabilized or destabilized by the reactions. Furthermore, we find so far unrevealed rupture mechanisms which are absent in the chemically inactive case. The linear stability predictions are confirmed by numerical simulations, which also demonstrate that the shape of chemically active droplets can depart from the spherical cap and that unsteady states such as traveling and standing waves might appear. Finally, we critically discuss the relevance of our predictions by showing that the range of our selected parameters is well accessible by typical experiments.
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