Full length articlePseudo line tension in pressurized liquid-phase laser ablation

- In liquid-phase laser ablation, the cavitation bubble is occupied by nanoparticles.
- Nanoparticles are allocated at the boundary of the cavitation bubble.
- With liquid pressurization, nanoparticles density increases inside the bubble.
- Both of line and surface tension exhibit anomalous values.
- The ratio of line and surface tensions is obtained as function of water pressure.

In pressurized liquid-phase laser ablation, the ratio between the pseudo line tension and the artificial surface tension (σ/S) is evaluated for the first time. It is treated as an adjusting parameter in the solution of Rayleigh-Plesset model to obtain the best fitting with the experimental observations of the dynamics of the cavitation bubble. It is found that σ/S satisfies the relationship σ/S∝P0(−1/3k), where k is the adiabatic constant. The occupation of the cavitation bubble with nanoparticles, that observed experimentally, deviates the normal magnitudes of σ/S to anomalous values. At water pressure P0=0.1 MPa, σ and S are estimated as 1.9×10−3 N and 4.2 N/m respectively.