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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.
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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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Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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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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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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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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Dipolar capillary interactions between tilted ellipsoidal particles adsorbed at fluid-fluid interfaces.

Gary B Davies1, Lorenzo Botto

  • 1Institute for Computational Physics, Allmandring 3, 70569 Stuttgart, Germany. gbd@icp.uni-stuttgart.de.

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Summary

This study reveals how tilted ellipsoidal particles assemble at fluid interfaces. A stable side-side configuration is found, with simulations showing novel flower-like and ring-like particle arrangements.

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Area of Science:

  • Physics
  • Materials Science
  • Colloid Science

Background:

  • Capillary interactions drive particle assembly at fluid interfaces.
  • These interactions influence emulsion and foam mechanical properties.
  • Previous work explored dipolar capillary interactions of ellipsoidal particles.

Purpose of the Study:

  • Numerically investigate interactions of tilted ellipsoidal particles at fluid interfaces.
  • Analyze the effect of varying aspect ratio, tilt angle, bond angle, and separation.
  • Explore particle assembly configurations and energy landscapes.

Main Methods:

  • High-resolution Surface Evolver simulations for particle pair interactions.
  • Lattice Boltzmann simulations for cluster behavior (up to 12 particles).

Main Results:

  • An energy barrier exists between metastable tip-tip and stable side-side configurations.
  • The side-side configuration is the global energy minimum across investigated parameters.
  • Simulations revealed novel, highly symmetric flower-like and ring-like arrangements in particle clusters.

Conclusions:

  • The side-side configuration is energetically favored for tilted ellipsoidal particles.
  • Complex, symmetric structures can emerge from capillary interactions.
  • This work advances understanding of directed assembly at fluid interfaces.