Liquid Crystalline Elastomer for Separate or Collective Sensing and Actuation Functions.

Area of Science:

• Materials Science
• Soft Robotics
• Polymer Chemistry

Background:

• Liquid crystalline elastomers (LCEs) are known for their stimuli-responsive actuation.
• Ionic liquids (ILs) offer unique electrical and thermal properties.
• Integrating ILs into porous LCEs can create multifunctional materials.

Purpose of the Study:

• To develop a porous liquid crystalline elastomer actuator filled with ionic liquid (PLCE-IL).
• To demonstrate the dual functionality of PLCE-IL as both an electrically responsive sensor and a stimuli-triggered actuator.
• To explore the potential of PLCE-IL in soft robotics and deformable electronics.

Main Methods:

• Synthesis of porous liquid crystalline elastomer filled with ionic liquid (PLCE-IL).
• Characterization of the material's phase transition behavior and mechanical properties.
• Testing the material's performance as a sensor for large deformations and environmental changes.
• Demonstrating actuation capabilities triggered by light and phase transitions.
• Integrating PLCE-IL into an artificial arm to showcase collective sensing and actuation functions.

Main Results:

• PLCE-IL exhibits reversible shape change upon order-disorder phase transition, enabling actuation.
• Below the phase transition, PLCE-IL functions as an elastomer sensor, reporting large deformations and environmental changes via electrical resistance variations.
• The material successfully demonstrated collective sensing and actuation in an artificial arm prototype.
• Light-fuelled soft robots can be assembled using the actuator's capabilities.

Conclusions:

• PLCE-IL presents a promising material platform for merging deformable electronics and actuation applications.
• The dual sensing and actuation capabilities open new avenues for intelligent soft materials and devices.
• Electrically responsive LCEs offer significant potential for advanced robotics and smart material systems.