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<p>Quantitative detection of hydroxyl radicals (·OH) was conducted and the hypothesis that laser induced cavitation can generate hydroxyl radicals was verified. Methylene blue (MB) was chosen as the ·OH spin trap and the standard curve was established according to the Lambert Beer's law. The dynamic sequent snapshots of laser-induced cavitation bubbles under different defocusing amounts and laser energies were analyzed. According to the change of the absorbance value, it confirms that the source of ·OH mainly contains two parts: the first one is laser-induced cavitation bubbles in MB solution, and the other is the interaction between laser-induced plasma and target. In addition, ·OH production mechanism mainly involves two aspects, namely optical breakdown and bubble collapse. The surface topographies and the compressive residual stress on 2A02 aluminum alloy presented that the strengthening mechanism relies on plasma shock wave and bubble collapse shock wave. A maximum hydroxyl radical concentration of 0.125&#xa0;μmol/L was achieved at a laser energy of 500&#xa0;mJ with a defocusing amount (H) of 1.0&#xa0;mm, which corresponded with the highest compressive residual stress of -187&#xa0;MPa induced on the 2A02 Al surface.</p>

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Hydroxyl radicals production and material enhancement induced by laser cavitation

  • 期刊论文

  • 发表日期：

    2025年12月17日

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  • Jiayang Gu,
  • Ruqi Li,
  • Decai Lu,
  • Hongjian Cai,
  • Bo Liang

摘要

Quantitative detection of hydroxyl radicals (·OH) was conducted and the hypothesis that laser induced cavitation can generate hydroxyl radicals was verified. Methylene blue (MB) was chosen as the ·OH spin trap and the standard curve was established according to the Lambert Beer's law. The dynamic sequent snapshots of laser-induced cavitation bubbles under different defocusing amounts and laser energies were analyzed. According to the change of the absorbance value, it confirms that the source of ·OH mainly contains two parts: the first one is laser-induced cavitation bubbles in MB solution, and the other is the interaction between laser-induced plasma and target. In addition, ·OH production mechanism mainly involves two aspects, namely optical breakdown and bubble collapse. The surface topographies and the compressive residual stress on 2A02 aluminum alloy presented that the strengthening mechanism relies on plasma shock wave and bubble collapse shock wave. A maximum hydroxyl radical concentration of 0.125 μmol/L was achieved at a laser energy of 500 mJ with a defocusing amount (H) of 1.0 mm, which corresponded with the highest compressive residual stress of -187 MPa induced on the 2A02 Al surface.