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Researchers developed a bubble-powered microdrone for 3-D navigation in liquids. This micro-robot uses controlled bubble excitation for propulsion and a unique design for stable maneuvering in biomedical applications.

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Area of Science:

  • Micro-robotics
  • Biomedical Engineering
  • Fluid Dynamics

Background:

  • Mobile microrobots are crucial for in vivo cargo delivery.
  • Wireless power and 3-D control are essential for effective microrobot navigation.

Purpose of the Study:

  • To describe a bubble-powered microdrone capable of controlled 3-D navigation.
  • To enable wireless propulsion and stable maneuvering for biomedical applications.

Main Methods:

  • Utilized two-photon polymerization to embed and align microtubes with air bubbles of varying lengths within the microdrone.
  • Engineered a non-uniform mass distribution for inherent stability and self-righting capabilities.
  • Developed a mathematical model to predict and validate the restoration mechanism.

Main Results:

  • Demonstrated on-demand 3-D propulsion through selective excitation of bubbles at their resonance frequencies.
  • Achieved stable maneuverability with spontaneous restoration to an upright position.
  • Mathematical model showed good agreement with experimental data.

Conclusions:

  • The bubble-powered microdrone offers robust 3-D maneuverability for microscale mobile cargo.
  • This technology shows potential for navigating in vitro and in vivo environments for biomedical applications.