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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
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Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
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Light-induced Patterning and Grafting for Slippery Surfaces based on Silane-coated Nanoporous Structures
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Structured surfaces for a giant liquid slip.

Choongyeop Lee1, Chang-Hwan Choi, Chang-Jin Cj Kim

  • 1Mechanical and Aerospace Engineering Department, University of California, Los Angeles (UCLA), California 90095, USA.

Physical Review Letters
|September 4, 2008
PubMed
Summary

We found that increasing the pitch and gas fraction of hydrophobic surfaces significantly enhances liquid slip. Near-perfect surfaces achieved giant slip lengths up to 185 micrometers by delaying wetting transitions.

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Materials science

Background:

  • Hydrophobic surfaces offer reduced friction.
  • Liquid slip on textured surfaces is crucial for various applications.
  • Controlling surface geometry is key to optimizing slip.

Purpose of the Study:

  • To experimentally investigate the impact of pitch and gas fraction on liquid slip.
  • To understand how microstructures influence slip length.
  • To achieve giant liquid slip lengths on hydrophobic surfaces.

Main Methods:

  • Fabrication of precisely controlled microstructures (posts and grates).
  • Independent control of pitch and gas fraction.
  • Measurement of water slip length using a rheometer system.

Main Results:

  • Slip length increases linearly with pitch.
  • Slip length dramatically increases with gas fraction above 90%, especially on posts.
  • Giant slip lengths (up to 185 micrometers) were achieved by stabilizing the dewetted state.

Conclusions:

  • Geometric parameters, particularly high gas fraction, are critical for giant liquid slip.
  • Surface design can overcome limitations imposed by meniscus instability.
  • Optimized hydrophobic surfaces show potential for ultra-low friction applications.