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Realizing Highly Efficient Sonodynamic Bactericidal Capability through the Phonon-Electron Coupling Effect Using

Congyang Mao1,2, Wanyu Jin1,2, Yiming Xiang1,2

  • 1Department of Orthopaedics & Traumatology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, 999077, China.

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Summary
This summary is machine-generated.

Designing 2D catalytic planar defects in Ti3C2 sheets enhances sonodynamic therapy by improving oxygen activation and singlet oxygen generation. This novel approach significantly boosts bactericidal capability and reduces bacterial burden in infected tissues.

Keywords:
Schottky defectsactivation energyphonon-electron couplingsonodynamic therapytwo-dimensional catalytic planar defects

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Sonodynamic therapy (SDT) efficacy relies on catalytic defects in sonosensitizers.
  • Traditional 0D defects are limited by the Schottky defect principle.
  • Developing advanced defect structures is crucial for enhanced SDT performance.

Purpose of the Study:

  • To design and investigate 2D catalytic planar defects in Ti3C2 sheets for improved sonodynamic therapy.
  • To explore the mechanism of enhanced reactive oxygen species generation via phonon-electron coupling.
  • To evaluate the therapeutic efficacy against methicillin-resistant Staphylococcus aureus in vivo.

Main Methods:

  • Fabrication of 2D planar defects (Ti3C2-SD(Ti3+)) in Ti3C2 sheets.
  • Investigation of oxygen activation and singlet oxygen generation under ultrasound (US) stimulation.
  • Analysis of electron transfer mechanisms using the phonon drag effect.
  • In vivo evaluation of neutrophil membrane-coated Ti3C2-SD(Ti3+) for treating infected bony tissue.

Main Results:

  • The designed 2D defects significantly enhance singlet oxygen generation (99.72% bactericidal capability).
  • Phonon drag effect dramatically reduces oxygen activation energy from 1.65 to 0.06 eV.
  • Neutrophil membrane-coated Ti3C2-SD(Ti3+) achieved a 6-log10 reduction in bacterial burden.
  • The catalytic site transformed from 0D to 2D, marking a significant advancement.

Conclusions:

  • 2D catalytic planar defects in Ti3C2 sheets offer a superior strategy for sonodynamic therapy.
  • Phonon-electron coupling is the key mechanism driving enhanced oxygen activation and therapeutic outcomes.
  • The developed nanomaterial shows promising potential for treating bacterial infections in vivo.