Multimodal microwheel swarms for targeting in three-dimensional networks

Area of Science:

• Robotics
• Biomedical Engineering
• Materials Science

Background:

• Microscale robots are crucial for targeted drug delivery in complex 3D environments.
• Magnetically actuated colloidal microwheels (µwheels) demonstrate rapid translation and directed movement.

Purpose of the Study:

• To investigate the swarm behavior of microwheels at high concentrations.
• To assess the capability of microwheel swarms to navigate and perform tasks in complex 3D microenvironments.

Main Methods:

• Studied microwheel swarms formed from superparamagnetic beads under varying magnetic field actuation patterns.
• Characterized translation and dispersion of individual µwheels and swarms on inclined and flat surfaces.
• Evaluated swarm navigation in 3D vascular models with bifurcations and turns.

Main Results:

• Microwheel swarms exhibit multimodal behaviors including cargo transport, incline climbing, area spreading, and mechanical action.
• Swarm navigation achieved good targeting efficiencies over centimeter scales in complex 3D vascular models.
• Demonstrated a readily reconfigurable swarm platform for 3D microenvironment navigation.

Conclusions:

• High-concentration microwheel swarms offer a versatile and reconfigurable platform for navigating complex 3D environments.
• This approach shows promise for advanced applications such as targeted drug delivery.
• The study highlights the potential of magnetically actuated swarms in micro-robotics.