Performance Evaluation and Optimization of an Ink/Polyurethane Actuator for Light-Driven Soft Gripper.

Area of Science:

• Materials Science
• Robotics
• Photonics

Background:

• Flexible light-driven actuators are essential for advanced soft robotics and intelligent systems.
• Fabrication simplicity and robust performance are key demands for these actuators.
• Ink/polyurethane bilayer composites offer a promising platform for low-cost actuator development.

Purpose of the Study:

• To optimize the performance of a flexible, light-driven actuator based on an ink/polyurethane bilayer composite.
• To systematically investigate the effects of ink concentration and polyurethane layer thickness on actuation.
• To establish design principles for enhancing photothermal actuator performance.

Main Methods:

• Fabrication of ink/polyurethane bilayer composite actuators.
• Systematic variation of ink concentration and polyurethane layer thickness.
• Characterization of actuation performance (bending angle, response speed) and durability.
• Thermal analysis to understand the relationship between material properties and performance.

Main Results:

• Optimized actuation performance achieved at 220 mg/mL ink concentration and 50 µm polyurethane thickness.
• Thermal analysis indicated an optimal balance between photothermal efficiency and mechanical integrity.
• The optimized actuator demonstrated excellent durability, with no performance loss after 500 cycles.
• Validated material system for soft grippers and other soft robotic applications.

Conclusions:

• The study successfully optimized a low-cost, light-driven actuator with enhanced performance and durability.
• Specific material parameters (ink concentration, layer thickness) are critical for maximizing photothermal actuator efficiency.
• The developed material system and design principles are suitable for next-generation soft robotics.