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Issue 35, 2015
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Capillary droplet propulsion on a fibre

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A viscous liquid film coating a fibre becomes unstable and decays into droplets due to the Rayleigh–Plateau instability (RPI). Here, we report on the generation of uniform droplets on a hydrophobized fibre by taking advantage of this effect. In the late stages of liquid column breakup, a three-phase contact line can be formed at one side of the droplet by spontaneous rupture of the thinning film. The resulting capillary imbalance leads to droplet propulsion along the fibre. We study the dynamics and the dewetting speed of the droplet as a function of molecular weight as well as temperature and compare to a force balance model based on purely viscous dissipation.

Graphical abstract: Capillary droplet propulsion on a fibre

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The article was received on 20 May 2015, accepted on 23 Jun 2015 and first published on 29 Jun 2015

Article type: Paper
DOI: 10.1039/C5SM01228G
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Citation: Soft Matter, 2015,11, 6921-6926

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    Capillary droplet propulsion on a fibre

    S. Haefner, O. Bäumchen and K. Jacobs, Soft Matter, 2015, 11, 6921
    DOI: 10.1039/C5SM01228G

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