Abstract
We have successfully demonstrated a method to produce glass nanoparticles by a continuous-wave (CW) CO2 laser beam. Three types of glass composites were selected and generated glass nanoparticles exhibit lower melting temperature compared with bulk glass. To understand the mechanism of those particle size variations, we have simulated glass temperature and discussed on the strong relationship between glass transition temperatures and melting temperature of generated glass nanoparticles. Regarding melting temperature of glass particles, we investigated the cooling speed, fictive temperature of particles and the effect of the diffusion of water from increased surface area. Ejected particles collected were analyzed by scanning electron microscopy to determine particle sizes and evaluated the melting temperatures by differential thermal analysis. The measured mean particle diameters were 38, 141 and 222nm, and the differences of melting temperature between bulk and nanoparticles were 162, 46 and 3°C respectively.
