Janus magnetoelastic membrane swimmers

Area of Science:

• Soft robotics
• Micro-robotics
• Biomimetic propulsion

Background:

• Soft swimming microrobots are crucial for applications in biomedicine and environmental remediation.
• Controlling microrobot locomotion is essential for their effective use.
• Existing microrobots are inspired by microorganisms like flagella and cilia.

Purpose of the Study:

• To design and investigate Janus magnetoelastic crystalline membrane microswimmers.
• To explore propulsion mechanisms actuated by time-varying magnetic fields.
• To demonstrate locomotion control in terms of speed and direction.

Main Methods:

• Fabrication of Janus microswimmers with a ferromagnetic cap and magnetoelastic membrane body.
• Uniform distribution of superparamagnetic particles on the membrane surface.
• Actuation using time-varying magnetic fields to induce shape transitions and locomotion.

Main Results:

• Complex, nonreciprocal shape changes were observed due to magnetic, elastic, and hydrodynamic interactions.
• Propulsion speed was optimized by tuning membrane elastic properties.
• The Janus swimmer demonstrated magnetically guided spiral trajectories.

Conclusions:

• The Janus microswimmer design enables non-invasive locomotion control via magnetic fields.
• Tunable speed and directional guidance make these microswimmers promising for future applications.
• This study offers a new candidate for advanced microswimmer development.