Emergent Locomotion in Self-Sustained, Mechanically Connected Soft Matter Rings

Area of Science:

• Soft Matter Physics
• Materials Science
• Polymer Chemistry

Background:

• Natural systems exhibit complex emergent behaviors from individual interactions.
• Synthetic materials research aims to replicate this complexity, particularly using non-equilibrium self-assembly.
• Understanding and controlling emergent collective behavior in synthetic systems remains a challenge.

Purpose of the Study:

• To investigate the interactive behaviors and emergent functions of thermally fueled, twisted liquid crystal elastomer (LCE) rings.
• To explore how connected LCE rings exhibit collective locomotion and programmable movement.
• To establish a model for autonomous locomotion in soft matter constructs.

Main Methods:

• Fabrication of twisted LCE rings from thermoresponsive strips.
• Utilizing zero-elastic-energy-mode autonomous motion driven by heat gradients.
• Studying single rings and linked knots of N=2, 3, 4, and 5 LCE rings.
• Analyzing the effect of twisting numbers, links, and handedness on emergent behavior.

Main Results:

• Individual LCE rings exhibit self-sustained movements.
• Controlled, collective locomotion emerges in linked LCE ring systems when N ≥ 3.
• Locomotion directionality can be programmed by controlling the handedness at connection points.
• Mechanical coupling between LCE components drives emergent group activity.

Conclusions:

• Linked LCE rings can autonomously generate programmed locomotion through mechanical coupling.
• This study provides a framework for designing soft matter systems with emergent collective behaviors.
• Findings offer insights into bio-inspired design principles for responsive materials.