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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 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,...
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...
Capillarity in Fluid01:19

Capillarity in Fluid

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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Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces
08:05

Microtensiometer for Confocal Microscopy Visualization of Dynamic Interfaces

Published on: September 9, 2022

Surface fluctuations at the liquid-liquid interface.

Janamejaya Chowdhary1, Branka M Ladanyi

  • 1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA. janamej@lamar.colostate.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

We modified the capillary-wave model (CWM) for liquid-liquid interfaces, successfully predicting surface tension and interfacial widths using molecular dynamics simulations. Hydrocarbon branching showed minimal impact on model parameters.

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Area of Science:

  • Interfacial Science
  • Soft Matter Physics
  • Computational Chemistry

Background:

  • The capillary-wave model (CWM) describes liquid-vapor interfaces using capillary waves.
  • Extending CWM to liquid-liquid interfaces requires modifications to address unique interfacial properties.

Purpose of the Study:

  • To adapt the capillary-wave model for liquid-liquid interfaces.
  • To incorporate surface-bulk coupling and surface curvature effects.
  • To accurately predict interfacial properties like surface tension and width.

Main Methods:

  • Modification of the capillary-wave model into three distinct models (1, 2, and 3).
  • Molecular dynamics simulations of water-hydrocarbon interfaces with varying hydrocarbon structures.
  • Analysis of surface site distribution and surface fluctuation wave-vector dependence.

Main Results:

  • Developed a modified CWM applicable to liquid-liquid interfaces.
  • Identified a critical length scale connecting molecular and mesoscopic surface fluctuations.
  • Achieved good agreement between model predictions and simulation results for surface tension and interfacial widths.

Conclusions:

  • The modified capillary-wave model provides accurate predictions for liquid-liquid interfaces.
  • The approach successfully bridges molecular and mesoscopic descriptions of interfaces.
  • Hydrocarbon branching has a limited influence on the interfacial model parameters.