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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Soft Robotics

Background:

  • Möbius strips, known for their unique topology, possess intriguing mechanical properties.
  • These properties suggest potential applications in developing continuous deformation actuators.
  • Liquid crystal elastomers (LCEs) are responsive polymers suitable for advanced material applications.

Purpose of the Study:

  • To fabricate and investigate bi-layered stripe actuators based on the Möbius strip topology.
  • To explore the potential of these actuators for continuous, in-situ rotation using photothermal response.
  • To develop novel shape-morphing materials and topological actuators.

Main Methods:

  • Fabrication of bi-layered stripe actuators using photothermally responsive liquid crystal elastomers.
  • Utilizing a specialized procedure to create Möbius strips with an odd number of twists.
  • Inducing a contraction gradient via near-infrared (NIR) light irradiation to trigger deformation.

Main Results:

  • Successfully fabricated seamless, homogeneous Möbius strip actuators with an odd number of twists.
  • Demonstrated continuous anticlockwise and clockwise in-situ rotation of the actuators upon NIR light exposure.
  • Showcased the ability to control rotational direction through a contraction gradient.

Conclusions:

  • Bi-layered Möbius strip actuators made from LCEs can achieve continuous, controllable rotation.
  • This photothermally driven system offers a new paradigm for shape-morphing materials and topological actuators.
  • The findings suggest a move beyond discrete state-switching in actuator design.