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Related Concept Videos

Surface Tension of Fluid01:22

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...
Surface Tension01:24

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,...
Contact Angle01:13

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, Capillary Action, and Viscosity02:57

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 and Surface Energy01:16

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,...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...

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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

A mean field approach for computing solid-liquid surface tension for nanoscale interfaces.

Chi-cheng Chiu1, R J K Udayana Ranatunga, David Torres Flores

  • 1Department of Chemistry, The University of Texas at Dallas, 800 West Campbell Road, Richardson, Texas 75080, USA.

The Journal of Chemical Physics
|February 9, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces a mean field approach for calculating solid-liquid surface tension in nanoscale systems. The method provides physical insight into the relationship between surface tension and solvation free energy for nanostructures.

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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy
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Nanoscale Characterization of Liquid-Solid Interfaces by Coupling Cryo-Focused Ion Beam Milling with Scanning Electron Microscopy and Spectroscopy

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Physics

Background:

  • Solid-liquid surface tension is critical for nanoscale systems due to high surface area to volume ratios.
  • Experimental measurement of surface tension in nanoscale systems is indirect.
  • Reliable computational methods for direct evaluation of nanoscale solid-liquid surface tension are still developing.

Purpose of the Study:

  • To develop a direct computational method for evaluating solid-liquid surface tension at the nanoscale.
  • To elucidate the relationship between surface tension and excess solvation free energy for nanoscale interfaces.
  • To provide a simplified expression for surface tension applicable to various nanoscale interface shapes.

Main Methods:

  • Utilized a mean field approach to model the solid as a continuum of uniform density.
  • Incorporated parametric dependence on solid object size into the system's Hamiltonian.
  • Derived surface tension as the derivative of system free energy with respect to solid-liquid surface area.

Main Results:

  • The mean field approach offers significant physical insight into surface tension calculations.
  • Established a precise relationship between surface tension and excess solvation free energy per unit surface area for nanoscale interfaces.
  • Developed a general expression for surface tension applicable to interfaces of arbitrary shape, demonstrated with nanoribbon and nanoparticle models.

Conclusions:

  • The presented mean field method offers a novel approach to calculating solid-liquid surface tension at the nanoscale.
  • This method provides valuable insights into the behavior of surface tension in confined systems.
  • The findings may facilitate new research directions in nanoscience and materials engineering.