Dynamics of groups of magnetically driven artificial microswimmers

Area of Science:

• * Robotics and Automation
• * Biomedical Engineering
• * Fluid Dynamics

Background:

• * Magnetically driven artificial microswimmers offer potential for advanced biomedical applications, including minimally invasive microsurgery, precise microparticle manipulation, and localized drug delivery.
• * Effective implementation of these technologies necessitates controlled dynamics of microswimmer teams with minimal external feedback.

Purpose of the Study:

• * To investigate the motion and fluid dynamics of groups of artificial microswimmers propelled by rotating magnetic fields.
• * To analyze the collective behavior and coherence of microswimmer ensembles.

Main Methods:

• * Utilized Stokesian dynamics simulations to model the behavior of magnetic microswimmers.
• * Analyzed the fluid velocity fields generated by individual and multiple microswimmers.
• * Compared simulated fluid dynamics to theoretical models like the rotlet singularity.

Main Results:

• * Simulations demonstrated that microswimmer motion generates a rotational velocity field, causing interacting swimmers to follow circular and helical trajectories.
• * The fluid velocity field was found to be reasonably approximated by a rotlet on average.
• * Larger groups of microswimmers exhibited coherent motion, particularly when their magnetizations were uniform, with a stable group center.

Conclusions:

• * The study provides insights into the collective dynamics of magnetic microswimmers.
• * Uniform magnetization enhances group coherence, which is essential for controlling ensembles of microswimmers.
• * Findings are valuable for developing advanced control strategies for micro-robotics in biomedical applications.