Description
The initial stages of aerosol formation and growth define important properties of mature aerosols such as size, shape and number concentration of agglomeratesas well as their constituting primary particles. A useful term for differentiating size domains is the mean free path (λ) of the carrier gas. The continuum regime,
dominated by diffusion and heat transfer, is applicable for aerosols larger than λ, and has been more widely studied. On the other hand, the free molecular
regime, dominated by kinetic effects, is applicable to particles much smaller than λ and the transition regime lays in between. Reports of experimental
measurements of aerosol dynamics in the free molecular and transition regime are not very abundant due to the limitations and difficulties in probing such small particles undergoing their intrinsic ultra-fast dynamics. In this work, we utilized the constant angle Mie scattering (CAMS) method, which has been successfully applied in the past for observing growth rate of aerosols slightly smaller than one micrometer, well in the continuum regime. For our measurements we use vacuum ultraviolet light (VUV) in order to resolve much smaller particles, up to 100 nm, in the free molecular regime for pressures slightly lower than atmospheric. The experimental results are of fundamental relevance and can be directly applied to extend our theoretical understanding of aerosol science and at the same time can be transferred to develop advanced technology from the development of better and more cost effective electronics, to the improvement of our understanding of climate and global
| Period | 26 Aug 2019 |
|---|---|
| Event title | European Aerosol Conference 2019 |
| Event type | Conference |
| Location | Göteborg, SwedenShow on map |