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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
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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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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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Fast Imaging Technique to Study Drop Impact Dynamics of Non-Newtonian Fluids
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A comparison between liquid drops and solid particles in partial wetting.

Antonio Stocco1, Maurizio Nobili1

  • 1Laboratoire Charles Coulomb (L2C), UMR 5221 CNRS-Univ. Montpellier, Montpellier F-34095, France.

Advances in Colloid and Interface Science
|July 22, 2017
PubMed
Summary
This summary is machine-generated.

Comparing a liquid drop on a surface and a particle at an interface reveals non-trivial differences in wetting behavior, even with identical physical interactions. This review details free energies, friction, and hysteresis in partial wetting systems.

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Area of Science:

  • Physical Chemistry
  • Surface Science
  • Colloid Science

Background:

  • Partial wetting phenomena are crucial in various scientific and industrial applications.
  • Understanding the behavior of liquid interfaces and solid surfaces is essential for controlling interfacial properties.

Purpose of the Study:

  • To critically compare the physics of partial wetting in two distinct geometries: a liquid drop on a planar substrate and a spherical particle at a planar liquid interface.
  • To elucidate the similarities and differences in free energies and friction between these two systems.
  • To analyze contact angle hysteresis, surface roughness, and line pinning effects on wetting behavior.

Main Methods:

  • Comparative analysis of theoretical models and experimental data for both geometries.
  • Discussion of fundamental principles governing interfacial phenomena.
  • Review of literature on wetting, surface energy, and adhesion.

Main Results:

  • The comparison between the two geometries is complex, despite shared physical interactions.
  • Significant differences exist in free energy landscapes and frictional forces.
  • Contact angle hysteresis, surface roughness, and line pinning manifest distinct effects in each geometry.

Conclusions:

  • The behavior of a liquid drop on a substrate and a particle at an interface, while related, exhibit unique wetting characteristics.
  • Interfacial properties like free energy, friction, and hysteresis are geometry-dependent.
  • This comparative study provides insights into controlling wetting in diverse systems.