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Related Experiment Videos

Controlling orientational order in block copolymers using low-intensity magnetic fields.

Manesh Gopinadhan1, Youngwoo Choo1, Kohsuke Kawabata1,2

  • 1Department of Chemical and Environmental Engineering, Yale University, New Haven, CT 06511.

Proceedings of the National Academy of Sciences of the United States of America
|October 29, 2017
PubMed
Summary

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This summary is machine-generated.

Researchers developed a new method for aligning liquid crystalline block copolymers (LC BCPs) using low-intensity magnetic fields. This breakthrough, achieved by adding labile mesogens, enables precise control over microstructures for advanced material applications.

Area of Science:

  • Condensed matter physics
  • Materials science
  • Polymer science

Background:

  • Phase transitions in condensed matter create diverse physical phenomena.
  • Liquid crystalline block copolymers (LC BCPs) exhibit anisotropic magnetic susceptibility, enabling self-assembly into oriented microstructures under magnetic fields.
  • Previous methods required high magnetic fields (>4 T), limiting accessibility.

Purpose of the Study:

  • To demonstrate the possibility of achieving highly oriented LC BCP mesophases using low-intensity magnetic fields (<0.5 T).
  • To investigate the role of labile mesogens in facilitating low-field alignment.
  • To explore methods for controlling structural order and creating complex alignment patterns in BCPs.

Main Methods:

  • Co-assembly of LC BCPs with labile mesogens.
Keywords:
aligned polymersblock copolymersliquid crystalsmagnetic field processingself-assembly

Related Experiment Videos

  • Application of low-intensity magnetic fields (0.2 T to 0.5 T).
  • Analysis of mesophase orientation using orientation distribution coefficients.
  • Investigation of alignment kinetics and saturation field strength dependence on mesogen concentration.

    • Main Results:

    • Highly aligned mesophases were achieved using fields as low as 0.2 T, accessible with permanent magnets.
    • Labile mesogens enhanced alignment kinetics by reducing viscosity and increasing magnetostatic energy.
    • Alignment saturation field strength and kinetics showed strong dependence on free mesogen concentration.
    • Orientation distribution coefficients close to unity were obtained, indicating significant alignment.

    Conclusions:

    • Low-intensity magnetic fields, enabled by labile mesogens, provide an accessible route for orienting LC BCPs.
    • This method allows for precise control over structural order, opening possibilities for creating complex textures and patterns.
    • The findings suggest potential applications in advanced materials fabrication by locally screening fields with magnetic nanoparticles.