| Wed November 16th 2016 16:15 – 16:45 ZH286 | Seminar | Bubbles generation around gold nanoparticles under continuous-wave illumination Mikhail Zaytsev |
Details:Plasmonic nanoparticles have attracted considerable interest over the past few decades as the great sources of heat on a nanoscale due to their high efficiency of the light into heat conversion. Gas bubbles can be produced by exposing water-immersed metallic nanoparticles to light with a wavelength that matches with the plasmonic resonance wavelength of the metallic nanoparticles. To date, it is still not fully clear how these gaseous bubbles form. In this talk, the growth dynamics of micro-sized bubbles around laser irradiated water-immersed gold nanoparticles will be considered. In order to determine the exact origin of the occurrence and growth of these bubbles we studied, and compared, their growth dynamics in air-equilibrated water and degassed water. The microbubbles characteristics such as the contact angle, footprint diameter and radius were obtained and analyzed. Our experiments reveal that the growth dynamics can be divided into two phases: an initial phase and a second phase. The initial phase is identical for air-equilibrated and degassed water, whereas the second phase is distinctly different. The concept of this difference is also proposed. | ||
