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Topography-Free Dual-Lubricant Patterned Slippery Surfaces for Programmable Droplet Control and High-Performance

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Researchers developed a novel topography-free slippery liquid-infused porous surface (SLIPS) for advanced droplet control. This heterogeneous oil-infused porous surface (HOIPS) enhances water harvesting and adaptive wetting applications.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Passive droplet control is essential for technologies like water harvesting and fluidic logic.
  • Existing slippery liquid-infused porous surfaces (SLIPS) often rely on topography or complex fabrication.

Purpose of the Study:

  • To develop a scalable, topography-free SLIPS for precise droplet manipulation.
  • To create a versatile platform for adaptive wetting surfaces and efficient water harvesting.

Main Methods:

  • Synthesized a poly[1-phenyl-2-[p-(trimethylsilyl)phenyl]acetylene] (PTMSDPA) based porous film.
  • Achieved selective chemical fluorination and sequential infusion of immiscible lubricants to create interfacial energy contrasts.
  • Utilized intrinsic fluorescence for visualization of lubricant domains in the heterogeneous oil-infused porous surface (HOIPS).

Main Results:

  • Demonstrated controllable droplet motion on various substrates (flat, flexible, curved) without topography.
  • Showcased HOIPS patterns for controlled droplet coalescence, shedding diameter, and release timing during condensation.
  • Achieved up to 2.5x higher water-harvesting performance compared to existing fluorinated-oil-based SLIPS.

Conclusions:

  • PTMSDPA-based HOIPS offers a material-efficient strategy for liquid-repellent surfaces.
  • This platform enables versatile droplet manipulation and condensation management.
  • The ultrathin, flexible nature of HOIPS expands its applicability in next-generation devices.