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.