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Lookup NU author(s): Dr Elfego Ruiz GutierrezORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
The breakup of a slender filament of liquid driven by surface tension is a classical fluid dynamics stability problem that is important in many situations where fine droplets are required. When the filament is resting on a flat solid surface which imposes wetting conditions the subtle interplay with the fluid dynamics makes the instability pathways and mode selection difficult to predict. Here, we show how controlling the static and dynamic wetting of a surface can lead to repeatable switching between a toroidal film of an electrically insulating liquid and patterns of droplets of well-defined dimensions confined to a ring geometry. Mode selection between instability pathways to these different final states is achieved by dielectrophoresis forces selectively polarising the dipoles at the solid-liquid interface and so changing both the mobility of the contact line and the partial wetting of the topologically distinct liquid domains. Our results provide insights into the wetting and stability of shaped liquid filaments in simple and complex geometries relevant to applications ranging from printing to digital microfluidic devices.
Author(s): Edwards AMJ, Ruiz-Gutiérrez É, Newton MI, McHale G, Wells GG, Ledesma-Aguilar R, Brown CV
Publication type: Article
Publication status: Published
Journal: Scientific Reports
Year: 2021
Volume: 11
Issue: 1
Print publication date: 14/04/2021
Online publication date: 14/04/2021
Acceptance date: 26/03/2021
Date deposited: 01/12/2021
ISSN (electronic): 2045-2322
Publisher: Nature Publishing Group
URL: https://doi.org/10.1038/s41598-021-87549-5
DOI: 10.1038/s41598-021-87549-5
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