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Capillary Bridges on Liquid-Infused Surfaces.

Alvin C M Shek1, Ciro Semprebon2, Jack R Panter1

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Two-component capillary bridges on liquid-infused surfaces (LIS) show diverse behaviors and tunable adhesion. Researchers found LIS can be both slippery and sticky, offering new design possibilities.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Capillary bridges are crucial in microfluidics and soft matter.
  • Liquid-infused surfaces (LIS) offer unique lubrication properties.
  • Two-component systems present complex interfacial phenomena.

Purpose of the Study:

  • To numerically investigate the behavior of two-component capillary bridges between LIS.
  • To explore the influence of lubricant properties on bridge morphology and stability.
  • To characterize capillary forces and adhesion strength in these systems.

Main Methods:

  • Numerical simulations of two-component capillary bridges.
  • Analysis of droplet-LIS interactions and lubricant ridge formation.
  • Characterization of capillary force, maximum separation, and effective spring force.

Main Results:

  • Observed diverse morphologies: droplet contact with zero, one, or two LIS.
  • Identified instability due to lubricant envelopment upon compression.
  • Quantified influence of lubricant ridge shape/size on forces.
  • Demonstrated tunability of adhesion strength via pressure, Neumann angle, and contact angles.

Conclusions:

  • LIS exhibit tunable 'stickiness' perpendicular to the surface, beyond their known 'slippery' nature parallel to it.
  • Control over lubricant properties allows for enhanced capillary adhesion.
  • These findings have implications for designing interfaces with tailored adhesive properties.