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Flow-Induced Long-Term Stable Slippery Surfaces.

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Slippery lubricant-infused surfaces can now resist lubricant loss during flow. This is achieved by replenishing lubricant from emulsions, overcoming a key limitation for applications like drag reduction and anti-icing.

Keywords:
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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Fluid Dynamics

Background:

  • Slippery lubricant-infused surfaces (SLIPS) facilitate liquid droplet removal.
  • Capillary forces retain lubricants within textured or porous substrates.
  • SLIPS offer potential in drag reduction, anti-corrosion, anti-biofouling, and anti-icing.

Purpose of the Study:

  • To address shear-induced lubricant depletion in SLIPS.
  • To develop a method for continuous lubricant replenishment.
  • To enhance the durability and applicability of SLIPS.

Main Methods:

  • Utilizing oil-in-water emulsions for lubricant delivery.
  • Employing positively charged surfactants to modify oil droplet interactions.
  • Investigating the attachment and coalescence of oil droplets onto the substrate.

Main Results:

  • Successfully replenished lubricant in textured surfaces from flowing emulsions.
  • Demonstrated that minimal amounts of positively charged surfactant enable lubricant retention.
  • Showcased a method applicable to various lubricant-solid combinations.

Conclusions:

  • Developed a novel approach to overcome lubricant depletion in SLIPS.
  • The emulsion-based replenishment strategy enhances the longevity of slippery surfaces.
  • This technique broadens the practical applications of flow-induced lubrication.