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Related Concept Videos

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,...
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 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, 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...
Contact Angle01:13

Contact Angle

When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive force...
Adsorption Isotherms I01:29

Adsorption Isotherms I

Adsorption isotherms are mathematical models that describe how molecules in a gas or liquid phase interact with surfaces. Two of the most common isotherm models are the Langmuir and Freundlich isotherms, which relate to Type I monolayer chemisorption. The Langmuir model is based on four key assumptions:• Adsorption cannot exceed monolayer coverage.• All surface sites are equivalent.• Molecules adsorb only at vacant sites.• There are no interactions between adsorbed molecules.Consider the...

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Updated: May 28, 2026

Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
07:57

Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests

Published on: August 30, 2019

Relationship between surface tension and surface coverage.

Fredric M Menger1, Syed A A Rizvi

  • 1Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta, Georgia 30322, USA. menger@emory.edu

Langmuir : the ACS Journal of Surfaces and Colloids
|October 28, 2011
PubMed
Summary
This summary is machine-generated.

Surfactant adsorption at interfaces shows a slow surface tension decrease until 80% occupancy, followed by a steep, linear drop. This indicates cooperative adsorption beyond saturation, not surface saturation itself.

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Related Experiment Videos

Last Updated: May 28, 2026

Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
07:57

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Published on: August 30, 2019

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Extraction and Characterization of Surfactants from Atmospheric Aerosols
09:34

Extraction and Characterization of Surfactants from Atmospheric Aerosols

Published on: April 21, 2017

Area of Science:

  • Physical Chemistry
  • Colloid and Surface Science

Background:

  • Surfactant action is fundamentally linked to surface tension reduction.
  • Understanding the relationship between surfactant adsorption and surface tension is crucial for various applications.

Purpose of the Study:

  • To investigate the precise relationship between surfactant interfacial occupancy and surface tension reduction.
  • To clarify the phenomenon of cooperative adsorption and its implications for surface saturation.

Main Methods:

  • Utilized radioactive surfactants to perform accurate surface excess measurements.
  • Analyzed surface tension data in conjunction with interfacial occupancy percentages.

Main Results:

  • Surface tension shows minimal decline from 0% to 60% interfacial occupancy.
  • A steep, linear drop in surface tension initiates around 80% occupancy.
  • Cooperative surfactant adsorption continues beyond the critical micelle concentration.

Conclusions:

  • The linear region of surface tension drop does not signify surface saturation.
  • Discrepancies in interfacial area measurements arise from the complex, cooperative adsorption behavior of surfactants.