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Surface Tension

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 Viscosity

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 Fluid

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...

Contact Angle

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...

Surface Tension and Surface Energy

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,...

Frictional Force

Frictional Force

When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...

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Related Experiment Video

Updated: Jul 6, 2026

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Interfacial tension and spreading coefficient for thin films.

Rafael Tadmor¹, Ken G Pepper

¹Department of Chemical Engineering, Lamar University, Beaumont, Texas 77710, USA. rafael.tadmor@lamar.edu

Langmuir : the ACS Journal of Surfaces and Colloids

|March 6, 2008

Summary

This summary is machine-generated.

A new mathematical model refines interfacial tension for thin films, enabling accurate prediction of liquid film spreading and equilibrium thickness for wetting phenomena.

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Area of Science:

Physics
Physical Chemistry
Materials Science

Background:

Understanding thin film behavior is crucial in various scientific and industrial applications.
Existing models for interfacial tension may not accurately capture the behavior of very thin films.

Purpose of the Study:

To develop a modified mathematical expression for interfacial tension in very thin films.
To derive a new equation for the spreading coefficient based on film thickness.
To calculate the equilibrium thickness of wetting liquid films and validate with experimental data.

Main Methods:

Modification of the classic mathematical expression for interfacial tension.
Derivation of a thickness-dependent spreading coefficient equation.
Application of the derived equation to predict equilibrium film thickness for a 'pancake drop' model.

Main Results:

The modified expression accurately describes interfacial tension for very thin films.
The derived spreading coefficient equation provides a thickness-dependent relationship.
Calculated equilibrium film thicknesses show strong agreement with experimental observations.

Conclusions:

The modified mathematical expression offers improved accuracy for thin film interfacial tension.
The study provides a reliable method for predicting wetting film equilibrium thickness.
The findings are applicable to systems dominated by van der Waals interactions.