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Area of Science:

  • Nanotechnology
  • Materials Science
  • Robotics

Background:

  • Micro/nanomotors (MNMs) offer autonomous motion for applications like drug delivery and environmental remediation.
  • Current MNMs often rely on external fields for guidance, limiting their use in dynamic environments.
  • Self-navigation and self-targeting capabilities are crucial for MNMs to reach unknown or changing destinations.

Purpose of the Study:

  • To elucidate the intelligent response mechanisms of tactic micro/nanomotors (MNMs).
  • To review recent advancements in various types of tactic MNMs.
  • To envision future developments in synthetic tactic MNMs.

Main Methods:

  • Summarizing tactic MNM response mechanisms into two main models: local vector field alignment of asymmetric MNMs and propulsion force generation by isotropic MNMs.
  • Discussing progress in chemotactic, phototactic, rheotactic, gravitactic, and magnetotactic MNMs.
  • Analyzing how local vector fields (chemical gradients, light, flow, gravity, magnetic fields) induce directed motion.

Main Results:

  • Tactic MNMs utilize local vector fields to achieve self-navigation.
  • Asymmetric MNMs align via torques from vector fields (e.g., chemical gradients, flows, magnetic fields).
  • Isotropic MNMs generate propulsion directed by local vector fields.

Conclusions:

  • Tactic MNMs demonstrate intelligent self-navigation capabilities.
  • Future directions include enhancing sensitivity, diversifying chemical systems, and integrating multiple functionalities.
  • Continued development of tactic MNMs promises next-generation intelligent autonomous systems.