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Area of Science:

  • Microrobotics
  • Acoustic manipulation
  • Biomimetic design

Background:

  • Shape-morphing is crucial for biological adaptation and advanced engineered systems.
  • Miniaturized microrobots face challenges in achieving fast shape changes at small scales.
  • Ultrasound offers programmable, repeatable, and fast actuation suitable for microrobotics.

Purpose of the Study:

  • To introduce a novel acoustic micromachine capable of rapid, programmable shape deformation.
  • To explore design principles for acoustic-induced shape-morphing in microrobots.
  • To demonstrate controllable shape transformations for potential applications.

Main Methods:

  • Fabrication of an acoustic micromachine comprising two microbubbles linked by a microhinge.
  • Utilizing acoustic-field excitation to generate inter-bubble forces for deformation.
  • Implementing design principles for programmable acoustic deformation, including forward and inverse design.

Main Results:

  • Achieved complete micromachine deformation within milliseconds via acoustic excitation.
  • Demonstrated programmable control over shape changes by tuning excitation amplitude.
  • Successfully created and controlled microlotus and microbird structures as proof of concept.

Conclusions:

  • The developed acoustic micromachine enables rapid and programmable shape-morphing at the microscale.
  • Acoustic actuation provides a viable method for controlling microrobot deformation and functionality.
  • The demonstrated design principles pave the way for advanced microrobotic systems with information storage and multi-modal capabilities.