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

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.

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Genre: Journal Article

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 Creators:
Hack, M.A., Author
Costalonga, M., Author
Segers, T., Author
Karpitschka, Stefan A.1, Author              
Wijshoff, H., Author
Snoeijer, J.H., Author
Affiliations:
1Group Fluidics in heterogeneous environments, Department of Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2466703              

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 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.

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Language(s): eng - English
 Dates: 2018-10-292018
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.5048681
 Degree: -

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Title: Applied Physics Letters
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: 5 Volume / Issue: 113 Sequence Number: 183701 Start / End Page: - Identifier: ISSN: 0003-6951
CoNE: https://pure.mpg.de/cone/journals/resource/954922836223