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Related Concept Videos

The Colloidal State01:29

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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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Solution, Solubility, and Solubility Equilibrium
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Heterogeneous colloidal particles immersed in a liquid crystal.

Setarehalsadat Changizrezaei1, Colin Denniston2

  • 1Department of Physics and Astronomy, The University of Western Ontario, London, Ontario N6A 5B8, Canada.

Physical Review. E
|June 17, 2017
PubMed
Summary

Anisotropic particle interactions in liquid crystals create novel defect structures. Particle arrangement and liquid crystal type influence these structures and their energetic favorability.

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Area of Science:

  • Physics
  • Materials Science
  • Soft Matter Physics

Background:

  • Liquid crystals exhibit unique anisotropic properties.
  • Particle interactions within liquid crystals can lead to complex self-assembly.
  • Heterogeneous boundary conditions introduce further complexity to particle behavior.

Purpose of the Study:

  • To investigate anisotropic interactions between particles with heterogeneous boundary conditions.
  • To analyze the formation of defect structures in nematic and cholesteric liquid crystals.
  • To understand the energetic landscape governing particle configurations.

Main Methods:

  • Theoretical exploration of particle interactions.
  • Analysis of defect structures formation.
  • Energetic calculations for particle arrangements.

Main Results:

  • New defect structures emerge based on particle distance and orientation.
  • Cholesteric liquid crystal pitch influences defect structures and forces.
  • Particles favor planar alignment in nematic liquid crystals.
  • Multiple energy minima exist for particles in cholesteric liquid crystals, not confined to a single plane.

Conclusions:

  • Particle interactions and liquid crystal type dictate defect structure formation.
  • The pitch of cholesteric liquid crystals is a critical parameter for defect engineering.
  • Understanding these interactions is key for designing novel liquid crystal-based materials and devices.