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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Acoustic Engineering

Background:

  • Ultrasound (US) activation of mechanophores in polymers is often slow or ineffective at standard frequencies (20 kHz) and higher (MHz).
  • Existing methods struggle with efficient energy conversion for mechanochemical transformations.

Purpose of the Study:

  • To introduce polymeric microbubbles (PMBs) as a platform to enhance ultrasound-induced mechanochemical activation.
  • To investigate the mechanism of PMB-mediated activation under various US frequencies.

Main Methods:

  • Utilized polymeric microbubbles (PMBs) as acousto-mechanical transducers.
  • Applied both 20 kHz and MHz (high-intensity focused ultrasound - HIFU) irradiation.
  • Investigated three distinct mechanophores, including a flex-activation derivative.
  • Combined experimental studies with computational analysis.

Main Results:

  • PMBs significantly accelerated mechanochemical activation of multiple mechanophores under both 20 kHz and MHz US irradiation.
  • PMB volume oscillation generated stretching, compression, and polymer shell fracturing.
  • Unexpected activation of a flex-activation mechanophore was observed.
  • PMBs were found to exert compressive forces on mechanophores, differing from typical flow-induced elongational forces.

Conclusions:

  • Polymeric microbubbles serve as an effective platform for accelerating ultrasound-mediated mechanochemical transformations.
  • The unique compressive forces generated by PMBs offer a novel mechanism for polymer activation.
  • This approach holds promise for advanced biomedical applications requiring controlled mechanochemistry.