Regensburg 2022 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 7: Wetting, Fluidics and Liquids at Interfaces and Surfaces
CPP 7.8: Vortrag
Montag, 5. September 2022, 12:45–13:00, H39
Cloaking Transition of Droplets on Lubricated Brushes — •Rodrique Badr1, Friederike Schmid1, Doris Vollmer2, and Lukas Hauer2 — 1Johannes Gutenberg University, Mainz, Germany — 2Max Plank Institute for Polymer Physics, Mainz, Germany
We study the equilibrium properties and wetting behavior of a simple liquid on a polymer brush, with and without the presence of lubricant. We investigate the behavior of the brush in terms of grafting density and the amount of lubricant present. As for the wetting behavior, we study a sessile droplet on top of the brush. Our model and choice of parameters results in the formation of a wetting ridge and in the cloaking of the droplet by the lubricant, a phenomenon that is observed experimentally and is of integral importance to the dynamics of sliding droplets. We quantify the cloaking in terms of its thickness, which increases with the amount of lubricant present, and provide thermodynamic theory to explain the behavior. In addition, we investigate the dependence of contact angles on the size of the droplet and the possible effect of line tension, as well as the dependence on the cloaking/lubrication of the brush.