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Related Concept Videos

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...

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Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures
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Active shape-morphing elastomeric colloids in short-pitch cholesteric liquid crystals.

Julian S Evans1, Yaoran Sun, Bohdan Senyuk

  • 1Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.

Physical Review Letters
|May 21, 2013
PubMed
Summary

Researchers created active liquid crystal particles that change shape when heated by lasers. These shape-shifting particles can self-assemble and move, paving the way for adaptive composites and light-driven machines.

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Colloid Science

Background:

  • Active particles exhibit autonomous motion and shape changes.
  • Liquid crystal elastomers possess unique thermo-mechanical properties.
  • Controlling active particle behavior is key for advanced applications.

Purpose of the Study:

  • To develop active elastomeric liquid crystal particles capable of dynamic shape morphing.
  • To investigate light-induced shape transformations and particle locomotion.
  • To explore potential applications in adaptive composites and micro-machines.

Main Methods:

  • Soft lithography and polymerization in a magnetic field to create cylindrical particles.
  • Infiltration of gold nanocrystals for laser-induced heating.
  • Observation of shape changes, particle realignment, and director structure transformations.

Main Results:

  • Active liquid crystal particles with controllable shape morphing were successfully fabricated.
  • Laser-mediated heating induced dynamic shape changes and stable configurations.
  • Particles exhibited spontaneous realignment and director structure transformations in a cholesteric host.
  • Nonreciprocal shape morphing led to particle locomotion.

Conclusions:

  • The study demonstrates a novel method for creating light-driven active liquid crystal particles.
  • These particles offer a platform for controlled self-assembly and the development of light-responsive materials.
  • Findings bridge active colloids and liquid crystal solids, enabling new micromachine designs.