Development of High-Speed Nanoparticle Ejection Technique for Fabrication of Advanced Materials

Abstract

Laser-Induced Particle Impact Testing (LIPIT) uses laser ablation as a driving force to eject micro-sized particles at speeds of several km/s. Because plastic deformation of metallic materials depends on strain rate, the smaller particles achieved by LIPIT enable higher strain-rate impacts, resulting in the development of new industrial applications such as surface modification and machining fine holes in membrane structures. Therefore, this study developed LIPIT enabling smaller particle ejection and a particle velocity measurement method. Particle velocity measurements are generally performed using high-speed cameras, but we successfully captured the velocity of the leading particle using the developed mechanoluminescent sensor. Furthermore, we succeeded in ejecting sub-micron particles (silica particles with a diameter of 500 nm) and realized high-speed penetration testing of graphene and graphene oxide.