Printing wet-on-wet: Attraction and repulsion of drops on a viscous film

Hack, M.A.; Costalonga, M.; Segers, T.; Karpitschka, Stefan A.; Wijshoff, H.; Snoeijer, J.H.

doi:10.1063/1.5048681

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Printing wet-on-wet: Attraction and repulsion of drops on a viscous film

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Karpitschka, Stefan A.
Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society;

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Citation

Hack, M., Costalonga, M., Segers, T., Karpitschka, S. A., Wijshoff, H., & Snoeijer, J. (2018). Printing wet-on-wet: Attraction and repulsion of drops on a viscous film. Applied Physics Letters, 113: 183701. doi:10.1063/1.5048681.

Cite as: https://hdl.handle.net/21.11116/0000-0002-68DC-2

Abstract

Wet-on-wet printing is frequently used in inkjet printing for graphical and industrial applications,
where substrates can be coated with a thin liquid film prior to ink drop deposition. Two drops
placed close together are expected to interact via deformations of the thin viscous film, but the
nature of these capillary interactions is unknown. Here, we show that the interaction can be
attractive or repulsive depending on the distance separating the two drops. The distance at which
the interaction changes from attraction to repulsion is found to depend on the thickness of the film
and increases over time. We reveal the origin of the non-monotonic interactions, which lies in the
appearance of a visco-capillary wave on the thin film induced by the drops. Using the thin-film
equation, we identify the scaling law for the spreading of the waves and demonstrate that this governs
the range over which the interaction is observed.