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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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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Hierarchical roughness optimization for biomimetic superhydrophobic surfaces.

Michael Nosonovsky1, Bharat Bhushan

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899-8520, USA.

Ultramicroscopy
|June 16, 2007
PubMed
Summary

Designing stable superhydrophobic surfaces requires hierarchical roughness to maintain air pockets, crucial for low water contact angle hysteresis (CAH). Nature

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Last Updated: Jul 14, 2026

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Area of Science:

  • Surface Science
  • Materials Science
  • Tribology

Background:

  • Superhydrophobic surfaces exhibit high water contact angles (CA) and low contact angle hysteresis (CAH).
  • Achieving low CAH necessitates a stable composite interface with trapped air pockets.
  • Destabilizing factors like capillary waves and condensation threaten this interface.

Purpose of the Study:

  • To investigate the design principles for stable superhydrophobic surfaces.
  • To identify the role of surface topography in maintaining the liquid-solid interface.
  • To reconcile conflicting design requirements for optimal superhydrophobicity.

Main Methods:

  • Analysis of destabilizing factors affecting the composite interface.
  • Theoretical formulation of requirements for hierarchical roughness.
  • Introduction of a new parameter: spacing factor for asperities.

Main Results:

  • Hierarchical roughness, with nanoscale convex bumps on microasperities, enhances interface stability.
  • Nanoroughness is essential for supporting nanodroplets.
  • Optimal design balances asperity size/density with low solid-liquid contact area.

Conclusions:

  • Convex profiles and hierarchical structures are key to stable superhydrophobicity.
  • Biological superhydrophobic surfaces exemplify these optimized design principles.
  • The proposed design criteria offer a pathway for creating advanced functional surfaces.