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Updated: May 12, 2025

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Wetting Ridge Growth Dynamics on Textured Lubricant-Infused Surfaces.

Haobo Xu1, Tomasz Kulakowski1,2, Young Jin Lee1

  • 1Energy Transport Lab, Department of Mechanical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States.

ACS Applied Materials & Interfaces
|May 8, 2025
PubMed
Summary
This summary is machine-generated.

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Researchers studied the wetting ridge on lubricant-infused surfaces. This ridge, crucial for droplet mobility, is about 30% wider than the droplet and holds half its volume, independent of oil viscosity.

Area of Science:

  • Surface Science and Engineering
  • Fluid Dynamics
  • Microfluidics

Background:

  • Droplet-surface interactions are critical for microfluidic and lab-on-a-chip applications.
  • Lubricant-infused surfaces exhibit an axisymmetric annular wetting ridge, unlike conventional superhydrophobic surfaces.
  • The formation mechanism of this wetting ridge, driven by interfacial force imbalance, remains unclear.

Purpose of the Study:

  • To experimentally characterize and analytically model the wetting ridge on lubricant-infused surfaces.
  • To elucidate the role of the wetting ridge in droplet mobility.
  • To establish a mechanistic understanding of wetting ridge dynamics.

Main Methods:

  • Development of a geometry-based analytical model for the steady-state wetting ridge shape.
Keywords:
contact line pinningfluid-structure interactionslubricant depletionlubricant-infused surfacesthree-phase contact linewetting ridgewrapping layer

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  • Experimental validation of the analytical model.
  • Numerical simulations to further validate the model and understand ridge dynamics.

    • Main Results:

    • The steady-state wetting ridge radius is approximately 30% larger than the droplet radius.
    • The wetting ridge height reaches halfway to the droplet radius.
    • The wetting ridge volume is approximately 50% of the droplet volume, irrespective of oil viscosity.

    Conclusions:

    • A validated analytical model for the wetting ridge shape has been established.
    • Key geometric parameters of the wetting ridge (radius, height, volume) have been quantified.
    • The findings enhance the understanding of droplet behavior on lubricant-infused surfaces.