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Making Smectic Defect Patterns Electrically Reversible and Dynamically Tunable Using In Situ Polymer-Templated

Giuseppe Boniello1, Victoria Vilchez1, Emmanuel Garre1

  • 1Surface du Verre et Interfaces, UMR 125, CNRS/Saint-Gobain, 39, quai Lucien Lefranc, Aubervilliers, Cedex F-93303, France.

Macromolecular Rapid Communications
|April 20, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a method to make liquid crystal defect patterns electrically reversible. This allows for dynamic control of optical properties and tunable operating temperatures for new applications.

Keywords:
focal conic domainspolymer/liquid crystal compositesself-assemblysmectic A liquid crystalstopological defects

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Polymer Science

Background:

  • Liquid crystals (LCs) and their defect patterns, like focal conic domains (FCDs) in smectic A (SmA) phases, offer unique optical properties and nanoparticle ordering capabilities.
  • Current SmA defect patterns are electrically irreversible, limiting dynamic control and applications.
  • Developing methods for reversible control of LC defect patterns is crucial for advanced materials.

Purpose of the Study:

  • To develop a method for creating electrically reversible liquid crystal defect patterns.
  • To enable dynamic switching between different textural and optical states of FCDs.
  • To program the operating temperature range of polymer/LC composites.

Main Methods:

  • In situ polymerization of SmA FCD textures.
  • Transformation of SmA FCDs into electrically responsive LC phases (e.g., nematic).
  • Chemical composition tuning to program operating temperature range.

Main Results:

  • Achieved reversible voltage-controlled switching between different textural and optical states of FCDs.
  • Demonstrated the ability to program the operating temperature range of the resulting polymer/LC composite.
  • Created a method for dynamic tuning of LC-based nanostructured materials.

Conclusions:

  • In situ polymerization transforms irreversible SmA FCDs into dynamically tunable systems.
  • This approach enables voltage-controlled optical states and programmable temperature ranges.
  • The method opens new avenues for LC-based smart materials, including privacy layers and tunable hybrid devices.