Multi-Microseconds Microbubbles Induced by Nanoseconds Pulsed-Laser Heating of Gold Nano-Particles.

ABSTRACT: This study examines the effect of gold-nanoparticles (GNPs) aggregation on the formation of multimicrosecond water-vapor (WV) microbubbles (MBs) generated by nanosecond pulsed-laser heating of GNPs in water. The MBs' dynamics reveal a "dual-nature" system involving both WV phase change and the release of dissolved gases (DGs). High-speed visualization (216 kfps) captures two distinct stages in the MB lifecycle: an initial fast growth-collapse of the WV phase (multimicrosecond duration), followed by a slow collapse driven by DG release (>milliseconds). A double-exponential function effectively captures these stages, distinguishing WV and DG contributions. The prolonged WV lifetime, which differs significantly from previously reported nanosecond-scale lifetime, is strongly influenced by aggr

SUBMITTER: Allaf MA 

PROVIDER: S-EPMC11886655 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature