Mechanically Assisted Magnetic Actuation in Ceramic-Based Microscrolls for Fast and Durable Soft Robotic Systems

Area of Science:

• Materials Science
• Robotics
• Nanotechnology

Background:

• Soft magnetic actuators are crucial for untethered microscale robotic systems.
• Existing actuators often face limitations in speed, remote control, and durability.

Purpose of the Study:

• To introduce compact, magnetically responsive microscroll actuators inspired by butterfly proboscis geometry.
• To develop a durable ceramic-based actuator for microscale soft robotics.

Main Methods:

• Fabrication of hybrid films using vanadium pentoxide (V2O5) nanofibers and Fe3O4 nanoparticles.
• Transformation of planar films into microscrolls via a razor blade-assisted scrolling method.
• Actuation testing using near-field magnetic stimulation (approx. 60 mT).

Main Results:

• Microscroll actuators demonstrated rapid, reversible, and multidirectional actuation (up to 180°).
• Actuation is driven by a dual magneto-mechanical mechanism involving magnetic stresses and stored elastic strain.
• Achieved a high lifting ratio (32.5x mass), work density (approx. 8.1 kJm-3), and significant footprint reduction (up to 96%).
• Demonstrated exceptional durability with over 5000 actuation cycles.

Conclusions:

• The ceramic-based microscroll actuators offer a promising route for untethered soft robotic microsystems.
• The geometry-programmed actuation and robust ceramic-based design ensure high performance and longevity.