Enhancing Swimming Performance of Magnetic Helical Microswimmers by Surface Microstructure

Area of Science:

• Biomedical Engineering
• Microfluidics
• Robotics

Background:

• Artificial bacterial flagella (ABF), or magnetic helical microswimmers, show promise for targeted drug delivery and minimally invasive surgery.
• High motion efficiency is crucial for rapid in vivo/in vitro therapeutic applications of ABFs.

Purpose of the Study:

• To investigate the impact of surface microstructures on the swimming behavior and efficiency of ABFs.
• To explore the underlying mechanisms governing the movement of microstructured ABFs.

Main Methods:

• Introduction of surface microstructures to ABFs inspired by microorganisms.
• Development and application of a hydrodynamic model for microstructured ABFs.
• Experimental and analytical investigation of surface wettability and microstructure solid fraction effects.

Main Results:

• Microstructured ABFs exhibit a higher maximum forward velocity and step-out frequency compared to smooth ABFs.
• Interfacial slippage and fluid-microstructure interactions are key to the enhanced swimming performance.
• Surface wettability and microstructure solid fraction significantly influence ABF swimming dynamics.

Conclusions:

• Surface microstructures offer an effective strategy for enhancing the speed and efficiency of ABFs.
• Understanding fluid-microstructure interactions is vital for designing advanced microrobots.
• This research paves the way for faster and more effective microrobots in biomedical applications.