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Preparation of Liquid Crystal Networks for Macroscopic Oscillatory Motion Induced by Light

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Published on: September 20, 2017

Desynchronized liquid crystalline network actuators with deformation reversal capability.

Yao-Yu Xiao¹, Zhi-Chao Jiang¹, Jun-Bo Hou¹

¹Département de chimie, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada.

Nature Communications

|January 28, 2021

Summary

This study introduces a liquid crystalline network (LCN) actuator that switches shape twice per cycle. This novel bidirectional deformation enables advanced, light-driven soft robots with multimodal locomotion.

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Area of Science:

Materials Science
Polymer Science
Soft Robotics

Background:

Liquid crystalline network (LCN) actuators typically exhibit a single shape change per stimulus cycle.
Conventional LCN actuators transition between two states (e.g., LC phase and isotropic state) upon thermal or optical stimulation.

Purpose of the Study:

To develop a novel LCN actuator capable of completing two shape switches per stimulation cycle.
To achieve bidirectional deformation in a monolithic LCN actuator for advanced functionalities.
To explore applications in light-fueled soft robotics and multimodal locomotion.

Main Methods:

Fabrication of a monolithic LCN actuator with asymmetrical crosslinking and/or stretching.
Inducing order-disorder phase transitions via thermal or optical stimuli.
Characterizing the desynchronized actuation and reversible strain behavior of the LCN actuator.

Main Results:

The developed LCN actuator demonstrates a unique deformation reversal, transitioning from shape 1 to shape 2, and then to shape 3.
This multi-stage, bidirectional shape change is achieved within a single stimulation on/off cycle.
The desynchronized actuation strategy allows for two shape switches per stimulus cycle.

Conclusions:

The novel LCN actuator offers a unique platform for developing advanced soft robots.
The bidirectional shape change capability enables multimodal, light-driven locomotion by controlling light on/off times.
This desynchronized actuation strategy opens new avenues for LCN-based smart materials and devices.