Multi-Stimuli-Responsive Tadpole-like Polymer/Lipid Janus Microrobots for Advanced Smart Material Applications

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Microrobots offer smart transport for targeted delivery in complex biological environments like blood and the blood-brain barrier.
• Current micromanipulation in biology benefits from multi-stimuli responsive systems over single-stimulus ones.
• Biodegradable and biocompatible materials are crucial for safe in-vivo applications.

Purpose of the Study:

• To design and develop novel biodegradable, biocompatible Janus micromotors with multi-stimuli responsiveness.
• To investigate the combined effect of near-infrared light and magnetic fields for controlled microrobot propulsion.
• To explore the potential of these micromotors in both biological applications and environmental remediation.

Main Methods:

• Fabrication of Janus micromotors using PrecirolATO 5 and polycaprolactone with embedded polypyrrole nanoparticles (NPs) and magnetic NPs.
• Utilizing near-infrared light for photothermal conversion and magnetic fields for actuation.
• Demonstrating an "on/off" propulsion mechanism and catalytic pollutant degradation via the Fenton reaction.

Main Results:

• Successfully designed and synthesized bioinspired Janus micromotors exhibiting anisotropic geometry.
• Achieved dual-stimuli (near-infrared light and magnetic field) responsive "on/off" propulsion, enhancing control in liquid environments.
• Demonstrated the capability of magnetic NPs to remove organic pollutants through the Fenton reaction.

Conclusions:

• The developed Janus micromotors offer advanced, controllable propulsion for complex biological tasks.
• Multistimulus-responsive micromotors show significant potential for biosensing, drug delivery, and environmental water treatment.
• This bioinspired design opens new avenues for sophisticated micromanipulation and remediation technologies.