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Fire-Ant-Inspired Magnetic Swarms with Stable Flotation for Programmable Shape Morphing and Cooperative Multitasking
Yuhang Hu1, Xiaofeng Chen2, Qiuhuang Chen3
1Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, P. R. China.
Small (Weinheim an Der Bergstrasse, Germany)
|August 19, 2025
Summary
Bioinspired magnetic composite micro-floaters (MCMs) achieve stable air-water interface flotation, overcoming sinking issues for microrobotic swarms. These fire ant-inspired micro-floaters enable complex navigation and cargo transport in challenging fluid environments.
Area of Science:
- Materials Science
- Robotics
- Fluid Dynamics
Background:
- High-density microparticles typically sink in fluids, limiting their use in microrobotic applications.
- Existing magnetic microrobotic systems often require specific magnetic field orientations for operation.
- Fire ants exhibit remarkable buoyancy and collective behavior at air-water interfaces.
Purpose of the Study:
- To develop magnetic composite micro-floaters (MCMs) capable of stable flotation at air-water interfaces.
- To overcome the sinking tendency of high-density magnetic microparticles using bioinspired design.
- To create a versatile platform for surface-based microrobotics with enhanced functionality.
Main Methods:
- Fabrication of MCMs using a solvent-exchange phase inversion process, encapsulating NdFeB cores with hydrophobic polycaprolactone (PCL).
- Engineering surface roughness to emulate fire ant cuticle and air-trapping strategies for enhanced hydrophobicity.
- Utilizing programmable magnetic fields for swarm control, self-assembly, and navigation.
Main Results:
- MCMs demonstrated stable flotation against vertical magnetic fields up to 0.5 T.
- MCM swarms exhibited dynamic self-assembly, reconfiguration, and navigation in wave-disturbed environments.
- Successful demonstration of cargo transport (70x weight), oil spill remediation, and droplet manipulation (200x volume).
Conclusions:
- The developed MCMs offer a robust solution for magnetic microrobotics at air-water interfaces.
- Bioinspired surface engineering is key to achieving stable flotation for high-density micro-components.
- This platform opens new avenues for environmental remediation, microfluidics, and programmable matter applications.
