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Related Concept Videos

The Colloidal State01:29

The Colloidal State

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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...
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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...
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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...
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An Electrochemical Cholesteric Liquid Crystalline Device for Quick and Low-Voltage Color Modulation
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Colloidal cholesteric liquid crystal in spherical confinement.

Yunfeng Li1, Jeffrey Jun-Yan Suen1, Elisabeth Prince1

  • 1Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6.

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|August 27, 2016
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Summary
This summary is machine-generated.

Researchers explored how nanorods organize within spherical droplets, observing phase separation and new morphologies. This reveals how confinement impacts soft matter, like cholesteric liquid crystals, for advanced material properties.

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Area of Science:

  • Soft matter physics
  • Nanotechnology
  • Materials science

Background:

  • Spherical confinement of nanocolloids influences packing and self-assembly.
  • Colloidal liquid crystal organization in confined geometries is largely unexplored.
  • Understanding nanoparticle organization is key for advanced material design.

Purpose of the Study:

  • To investigate the organization of cholesteric liquid crystals formed by nanorods within spherical droplets.
  • To explore the effects of progressive confinement on liquid crystal morphology.
  • To understand how nanoparticle properties influence droplet characteristics.

Main Methods:

  • Utilized spherical confinement of cellulose nanocrystal suspensions.
  • Varied droplet size to induce different confinement levels.
  • Characterized nanoparticle distribution and resulting liquid crystal structures.

Main Results:

  • Observed phase separation into an isotropic core and a cholesteric shell under progressive confinement.
  • Identified a transition to bipolar planar cholesteric morphology with further confinement.
  • Demonstrated that nanoparticle type (polymer, metal, oxide) dictates droplet properties like fluorescence and magnetic actuation.

Conclusions:

  • Confinement and order interplay significantly affects soft matter morphology in spherical droplets.
  • Cholesteric liquid crystal organization is tunable by confinement and nanoparticle characteristics.
  • This research opens avenues for creating functional soft matter with tailored optical, plasmonic, and magnetic properties.