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Alignment switching in 3D-printed smectic liquid crystal elastomers.

Jin-Hyeong Lee1, Kyeong Pyo Kim2, Lijie Ding3

  • 1School of Chemical Engineering, Pusan National University, Busan, Republic of Korea.

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|July 10, 2026
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Summary

Researchers developed a new 3D printing method for liquid crystal elastomers. This technique allows for precise control over material orientation, enabling complex shape-morphing capabilities in soft actuators.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Additive Manufacturing

Background:

  • Extrusion-based additive manufacturing enables shape-morphing materials via controlled orientation.
  • Current methods are limited by single-mode flow-induced alignment, restricting programmability.

Purpose of the Study:

  • To present a direct-ink-writing approach for smectic liquid crystal elastomers.
  • To exploit two distinct alignment modes within a single ink for enhanced orientation control.

Main Methods:

  • Utilized direct-ink writing of smectic liquid crystal elastics.
  • Investigated shear- and temperature-dependent orientation switching.
  • Employed rheological, X-ray, and molecular dynamics analyses.

Main Results:

  • Achieved reversible molecular alignment (perpendicular or parallel to print direction) by preserving or collapsing smectic layers.
  • Demonstrated encoding of both contractile and elongational actuation within filaments.
  • Fabricated 2D and 3D structures with programmed shape transformations.

Conclusions:

  • Developed a versatile platform for designing advanced liquid crystal elastomers.
  • Expanded design freedom for printed materials with tunable actuation.
  • Highlighted potential for adaptive soft actuators and architected functional materials.