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Area of Science:

  • Materials Science
  • Environmental Engineering
  • Nanotechnology

Background:

  • Photonic decontamination offers a novel approach for surface pollutant removal.
  • Laser ablation technology can generate airborne particles from material surfaces.

Purpose of the Study:

  • To investigate particle generation during laser ablation of various materials for decontamination.
  • To characterize the size distribution and concentration of airborne particles produced by laser ablation.

Main Methods:

  • Utilized a 266-nm laser to ablate cement, chromium-embedded cement, and alumina surfaces.
  • Employed scanning mobility particle sizer (SMPS) and aerosol particle sizer (APS) for particle analysis.
  • Conducted transmission electron microscopy (TEM) for particle morphology investigation.

Main Results:

  • Observed broad particle size distributions from nanometers to micrometers.
  • Particle number concentrations increased with laser fluence for all tested materials.
  • Cement demonstrated the highest efficiency for particle removal via laser ablation, followed by alumina and then stainless steel.

Conclusions:

  • Laser ablation is effective in generating airborne particles for material decontamination.
  • Particle size distributions are often bimodal, with smaller particles being aggregates and larger ones resulting from ejection.
  • Material properties significantly influence the efficiency of laser-induced particle removal.