| Fri February 21st 2020 11:00 – 12:00 ZH286 | Seminar | Laser induced nanobubbles around nanoparticles Thierry Biben |
Details:Noble metal nanoparticles like gold nanoparticles (GNP) display outstanding optical properties which make them ideal for a wide range of applications like cancer therapy or energy conversion. Thanks to their absorption properties, they can be used as local heat sources to promote boiling and generate vapor nanobubbles. While the coupling between GNP’s and light is now well understood, the energy transfer between the nanoparticle and the surrounding medium is far from clear. Various energy channels may be activated during the transfer: pressure wave emission, radiative transfer, thermal conduction, and of course the liquid-vapor phase transition itself. In order to control and optimize this energy transfer, we use a free-energy model to investigate the conditions that lead to nanobubble formation. In particular, we shall discuss the particular thermodynamic conditions that drives the formation of the pressure wave as well as the nanobubble. | ||
