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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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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.
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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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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

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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.
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Excess Pressure Inside a Drop and a Bubble01:13

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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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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Updated: Aug 24, 2025

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Microscopic liquid-gas interface effect on liquid wetting.

Jinming Zhang1, Wei Ding1, Zuankai Wang2

  • 1Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Fluid Dynamics, Dresden 01328, Germany.

Journal of Colloid and Interface Science
|October 24, 2022
PubMed
Summary
This summary is machine-generated.

Interface nano-bending, not the Young contact angle, governs wetting phenomena at the nanoscale. This nonlinear coupling effect explains deviations in droplet profiles and microlayer shapes observed in experiments.

Keywords:
Interface curvatureLiquid wettingMicrolayerNano-bendingNano-bubbleNano-dropletNonlinear-coupled effectNucleate boilingYoung contact angle

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Area of Science:

  • Surface science
  • Fluid dynamics
  • Nanotechnology

Background:

  • The Young contact angle is conventionally used to predict droplet profiles via the Young-Laplace equation.
  • Microscopic droplet profiles show deviations from spherical shapes, suggesting limitations of the Young contact angle.

Purpose of the Study:

  • To investigate the phenomenon of liquid-gas interface nano-bending.
  • To understand the nonlinear coupling between interface geometry and solid-liquid interactions.
  • To explain deviations in microscopic wetting phenomena.

Main Methods:

  • Molecular dynamics simulations
  • Mathematical modeling

Main Results:

  • Revealed the structure of interface nano-bending and its nonlinear coupling mechanism.
  • Demonstrated that interface nano-bending, not the Young contact angle, dictates wetting systems with high interface curvature.
  • Explained deviations in nano-droplet profiles and thin microlayer shapes.

Conclusions:

  • Interface nano-bending is crucial for understanding nanoscale wetting phenomena.
  • The findings provide insights into droplet and bubble behavior in microscale systems.
  • Highlights the importance of considering nonlinear coupling effects in wetting.