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Direct force measurement of microscopic droplets pulled along soft surfaces

Author

Listed:
  • Hamza K. Khattak

    (McMaster University)

  • Stefan Karpitschka

    (Max Planck Institute for Dynamics and Self-Organization)

  • Jacco H. Snoeijer

    (University of Twente)

  • Kari Dalnoki-Veress

    (McMaster University
    UMR CNRS Gulliver 7083, ESPCI Paris, PSL Research University)

Abstract

When a droplet is placed on a soft surface, surface tension deforms the substrate, creating a capillary ridge. We study how the motion of the ridge dissipates energy in microscopic droplets. Using a micropipette based method, we are able to simultaneously image and measure forces on a microscopic droplet moving at a constant speed along a soft film supported on a rigid substrate. Changing the thickness of the thin film tunes the effective stiffness of the substrate. Thus we can control the ridge size without altering the surface chemistry. We find that the dissipation depends strongly on the film thickness, decreasing monotonically as effective stiffness increases. This monotonic trend is beyond the realm of small deformation theory, but can be explained with a simple scaling analysis.

Suggested Citation

  • Hamza K. Khattak & Stefan Karpitschka & Jacco H. Snoeijer & Kari Dalnoki-Veress, 2022. "Direct force measurement of microscopic droplets pulled along soft surfaces," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-31910-3
    DOI: 10.1038/s41467-022-31910-3
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    References listed on IDEAS

    as
    1. S. Karpitschka & S. Das & M. van Gorcum & H. Perrin & B. Andreotti & J. H. Snoeijer, 2015. "Droplets move over viscoelastic substrates by surfing a ridge," Nature Communications, Nature, vol. 6(1), pages 1-7, November.
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