Active Micromotor Systems Built from Passive Particles with Biomimetic Predator-Prey Interactions

Area of Science:

• Materials Science
• Chemical Engineering
• Biomimetics

Background:

• Nature exhibits complex predator-prey dynamics and collective behaviors in swarms.
• Active micromotor systems offer potential for targeted cargo manipulation and complex tasks.
• Existing micromotors often require external fuels or fields, limiting their applications.

Purpose of the Study:

• To develop a novel concept for creating active micromotor systems using biomimetic predator-prey interactions.
• To demonstrate self-propulsion and collective behaviors in microparticle systems without external energy sources.
• To explore the potential for these systems in manipulating cargo and forming intelligent micro/nanomotor swarms.

Main Methods:

• Utilized a binary particle system with diffusiophoretic attractive (prey) and repulsive (predator) microparticles.
• Established biomimetic predator-prey interactions where predators chase prey, and prey swarm and escape.
• Demonstrated the concept with various synthetic micromotor systems, including ZnO-TiO2, Ag3PO4-TiO2, and ZnO-AgBr.

Main Results:

• Achieved self-powered active micromotor systems driven solely by inter-particle interactions.
• Observed predator particles chasing prey particles, with prey exhibiting dynamic group reconfigurations.
• Successfully demonstrated active micromotor systems capable of collective motion and potential cargo manipulation.

Conclusions:

• The proposed concept provides a new method for developing single micromotors powered by passive particles ('solid fuels').
• This approach enables the creation of micromotor swarms capable of manipulating 'moving cargo'.
• Illustrates a proof-of-concept for intelligent micro/nanomotor systems with heterogeneous, cooperative functions.