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Surface Stresses and a Force Balance at a Contact Line

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    Surface Stresses and a Force Balance at a Contact Line
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    Langmuir

    Cite this: Langmuir 2018, 34, 25, 7497–7502
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    https://doi.org/10.1021/acs.langmuir.8b01680
    Published May 30, 2018
    Copyright © 2018 American Chemical Society
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    Abstract

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    Results of the coarse-grained molecular dynamics simulations are used to show that the force balance analysis at the triple-phase contact line formed at an elastic substrate has to include a quartet of forces: three surface tensions (surface free energies) and an elastic force per unit length. In the case of the contact line formed by a droplet on an elastic substrate an elastic force is due to substrate deformation generated by formation of the wetting ridge. The magnitude of this force fel is proportional to the product of the ridge height h and substrate shear modulus G. Similar elastic line force should be included in the force analysis at the triple-phase contact line of a solid particle in contact with an elastic substrate. For this contact problem elastic force obtained from contact angles and surface tensions is a sum of the elastic forces acting from the side of a solid particle and an elastic substrate. By considering only three line forces acting at the triple-phase contact line, one implicitly accounts the bulk stress contribution as a part of the resultant surface stresses. This “contamination” of the surface properties by a bulk contribution could lead to unphysically large values of the surface stresses in soft materials.

    Copyright © 2018 American Chemical Society

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.langmuir.8b01680.

    • Simulation details and data sets; model and interactions; elastic substrates; polymeric droplets; droplet spreading or particle adhesion (PDF)

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    Cited By

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    Langmuir

    Cite this: Langmuir 2018, 34, 25, 7497–7502
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.langmuir.8b01680
    Published May 30, 2018
    Copyright © 2018 American Chemical Society
    Request reuse permissions

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