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Related Concept Videos

Surface Tension, Capillary Action, and Viscosity02:57

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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...
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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...
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Surface Tension and Surface Energy01:16

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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.
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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.
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Capillarity in Fluid01:19

Capillarity in Fluid

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
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The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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Accurate Determination of the Equilibrium Surface Tension Values with Area Perturbation Tests
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Inhomogeneous surface tension of chemically active fluid interfaces.

Alessio Squarcini1, Paolo Malgaretti1

  • 1Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, D-70569 Stuttgart, Germany.

The Journal of Chemical Physics
|December 23, 2020
PubMed
Summary
This summary is machine-generated.

The surface tension of fluid interfaces is influenced by suspended phases. This study reveals a non-monotonous relationship between surface tension and the density profile of the suspended phase.

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Area of Science:

  • Physics
  • Physical Chemistry
  • Materials Science

Background:

  • Fluid interfaces and surface tension are critical in various physical and chemical processes.
  • Understanding the influence of suspended phases on interfacial properties is essential for advanced material design.

Purpose of the Study:

  • To investigate how the density profile of a third suspended phase affects the surface tension of a fluid interface.
  • To derive analytical expressions for free energy and surface tension.

Main Methods:

  • Utilized an approximated model for binary mixtures.
  • Employed a perturbative approach to derive theoretical expressions.
  • Analyzed the dependence of surface tension on the spatial separation of suspended phase density peaks.

Main Results:

  • Derived closed-form expressions for the system's free energy and the interface's surface tension.
  • Observed a significant non-monotonous dependence of surface tension on the spatial separation of suspended phase density peaks.
  • Predicted the local surface tension for non-homogeneous suspended phase density distributions.

Conclusions:

  • The density profile of a suspended phase critically influences fluid interface surface tension.
  • Theoretical models can accurately predict these interfacial phenomena.
  • Findings offer insights for controlling interfacial properties in complex fluid systems.