Impact of energy dissipation on interface shapes and on rates for dewetting from liquid substrates

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Date
2018
Volume
8
Issue
Journal
Series Titel
Book Title
Publisher
[London] : Macmillan Publishers Limited, part of Springer Nature
Abstract

We revisit the fundamental problem of liquid-liquid dewetting and perform a detailed comparison of theoretical predictions based on thin-film models with experimental measurements obtained by atomic force microscopy. Specifically, we consider the dewetting of a liquid polystyrene layer from a liquid polymethyl methacrylate layer, where the thicknesses and the viscosities of both layers are similar. Using experimentally determined system parameters like viscosity and surface tension, an excellent agreement of experimentally and theoretically obtained rim profile shapes are obtained including the liquid-liquid interface and even dewetting rates. Our new energetic approach additionally allows to assess the physical importance of different contributions to the energy-dissipation mechanism, for which we analyze the local flow fields and the local dissipation rates. Using this approach, we explain why dewetting rates for liquid-liquid systems follow no universal power law, despite the fact that experimental velocities are almost constant. This is in contrast to dewetting scenarios on solid substrates and in contrast to previous results for liquid-liquid substrates using heuristic approaches.

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Keywords
velocity, Applied mathematics, Fluid dynamics, Surfaces, interfaces and thin films
Citation
Peschka, D., Bommer, S., Jachalski, S., Seemann, R., & Wagner, B. (2018). Impact of energy dissipation on interface shapes and on rates for dewetting from liquid substrates. 8. https://doi.org//10.1038/s41598-018-31418-1
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License
CC BY 4.0 Unported