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Related Concept Videos

Surface Tension01:24

Surface Tension

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,...
Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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...
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...

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Related Experiment Video

Updated: Jul 16, 2026

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications
11:20

Fabrication of Superhydrophobic Metal Surfaces for Anti-Icing Applications

Published on: August 15, 2018

Microtextured superhydrophobic surfaces: a thermodynamic analysis.

W Li1, A Amirfazli

  • 1Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada.

Advances in Colloid and Interface Science
|March 3, 2007
PubMed
Summary

This study thermodynamically analyzes superhydrophobic surfaces, revealing how surface geometry and liquid properties influence water repellency. Understanding these factors is key to designing effective self-cleaning materials.

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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

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Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel

Published on: March 29, 2018

Area of Science:

  • Materials Science
  • Surface Chemistry
  • Thermodynamics

Background:

  • Superhydrophobic surfaces (>150° contact angle) offer water-repellent and self-cleaning properties.
  • Thermodynamic mechanisms governing superhydrophobicity remain poorly understood.
  • Pillar microtextures are a common experimental model for superhydrophobic surfaces.

Purpose of the Study:

  • To thermodynamically analyze pillar microtextures for superhydrophobic surfaces.
  • To investigate the influence of surface geometry (pillar dimensions, solid fraction), intrinsic contact angle, drop size, and vibrational energy.
  • To provide insights into the design principles for practical superhydrophobic materials.

Main Methods:

  • Thermodynamic analysis of a pillar microtexture model.
  • Calculation of free energy (FE) and free energy barrier (FEB).
  • Systematic investigation of various influencing factors on superhydrophobic behavior.

Main Results:

  • Calculated apparent, equilibrium, advancing, receding contact angles, and contact angle hysteresis.
  • Proposed a criterion for the transition between non-composite and composite states.
  • Theoretical results align with Wenzel's, Cassie's equations, and experimental observations.

Conclusions:

  • Developed a robust model for understanding superhydrophobic surface behavior.
  • Identified key design principles for achieving desired superhydrophobic performance.
  • The study offers a theoretical framework for optimizing superhydrophobic surface design.