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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Dynamic Complex Liquid Crystal Emulsions.

Alberto Concellón1, Cassandra A Zentner1, Timothy M Swager1

  • 1Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States.

Journal of the American Chemical Society
|November 2, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed dynamic liquid crystal (LC) complex colloids using immiscible LC and fluorocarbon oils. These reconfigurable colloids can be switched between different emulsion types for advanced sensing applications.

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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Materials Chemistry

Background:

  • High surface tension between liquid crystals (LCs) and fluorocarbon oils typically results in unstable, nonspherical Janus droplets.
  • Controlling the morphology and internal structure of complex colloids is crucial for advanced material applications.

Purpose of the Study:

  • To report a new class of dynamically reconfigurable complex colloids based on immiscible LCs and fluorocarbon oils.
  • To demonstrate the ability to control droplet morphology and internal configurations for precision assembly.

Main Methods:

  • Utilizing specifically designed surfactants to stabilize interfaces and reduce surface tension.
  • Dynamically switching droplet morphology between LC-in-fluorocarbon-in-water (LC/F/W), Janus, and inverted (F/LC/W) emulsions via surfactant concentration changes.
  • Employing mesogenic surfactants to control the LC director field and create topological singularities.

Main Results:

  • Stable, spherical Janus droplets were produced by overcoming high interfacial tension with surfactants.
  • Dynamic switching of colloid morphology (LC/F/W, Janus, F/LC/W) was achieved by altering surfactant conditions.
  • Controlled LC anchoring enabled the creation of topological singularities for antibody assembly.

Conclusions:

  • Dynamic LC complex colloids offer a versatile platform for creating tunable soft materials.
  • The developed methods allow for precise control over colloid morphology and internal LC orientation.
  • These complex colloids show significant potential for use in various sensing applications, particularly those involving antibody assembly.