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Related Concept Videos

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,...
Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
Colloidal precipitates01:09

Colloidal precipitates

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...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
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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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Published on: May 21, 2014

Novel Colloidal Interactions in Anisotropic Fluids

Poulin1, Stark, Lubensky

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA.

Science (New York, N.Y.)
|March 21, 1997
PubMed
Summary
This summary is machine-generated.

Colloidal interactions between water droplets in liquid crystals create unique chain-like structures. These interactions offer new possibilities for stabilizing colloidal systems.

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Area of Science:

  • Colloid and Interface Science
  • Soft Matter Physics
  • Materials Science

Background:

  • Anisotropic fluids like nematic liquid crystals exhibit unique properties.
  • Colloidal particles dispersed in such fluids experience novel interactions.
  • Understanding these interactions is key to controlling particle assembly.

Purpose of the Study:

  • To investigate the colloidal interactions of small water droplets in a nematic liquid crystal host.
  • To elucidate the origin of these interactions based on the host fluid's elastic energy.
  • To explore potential applications in colloid stabilization.

Main Methods:

  • Theoretical analysis of elastic energy in anisotropic fluids.
  • Modeling of inter-droplet forces.
  • Observation of colloidal self-assembly.

Main Results:

  • Identified short-range repulsion and long-range dipolar attraction between water droplets.
  • Observed the formation of anisotropic chain-like structures.
  • Demonstrated that repulsive interactions can be harnessed for colloid stabilization.

Conclusions:

  • Water droplet interactions in nematic liquid crystals are governed by orientational elastic energy.
  • These interactions lead to unique anisotropic colloidal structures.
  • The discovered repulsive forces present novel strategies for colloid stabilization.