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Related Concept Videos

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,...
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...
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 Active Agents01:27

Surface Active Agents

Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...

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Related Experiment Video

Updated: May 25, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Surface-surface interaction in smectic liquid crystal films.

LiDong Pan1, C S Hsu, C C Huang

  • 1School of Physics and Astronomy, University of Minnesota, Minneapolis, Minnesota 55455, USA.

Physical Review Letters
|February 14, 2012
PubMed
Summary
This summary is machine-generated.

Researchers studied field-induced transitions in freestanding smectic liquid crystal films. They discovered a quasilong-ranged, antiferroelectric interlayer interaction between film surfaces.

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Last Updated: May 25, 2026

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Physical Chemistry

Background:

  • Smectic liquid crystals exhibit complex surface arrangements.
  • Understanding interlayer interactions is crucial for their applications.

Purpose of the Study:

  • To investigate field-induced transitions in freestanding smectic liquid crystal films.
  • To characterize the interlayer interaction between film surfaces.

Main Methods:

  • Utilized null transmission ellipsometry to study surface arrangements.
  • Analyzed threshold voltage to determine interlayer interaction.

Main Results:

  • Observed a field-induced transition in surface arrangements.
  • Identified the interlayer interaction as antiferroelectric and quasilong-ranged.

Conclusions:

  • The interlayer interaction in these films is antiferroelectric and quasilong-ranged.
  • Discussed microscopic origins and relevance to antiferroelectric liquid crystal materials.