Physical and Chemical Behavior of Small Particles

本研究是对(1)液滴生长和蒸发动力学的实验研究；(2)颗粒上的非均相成核、吸附及其成膜；(3)气溶胶的罗马散射化学鉴定。实验将使用电动天平在受控环境中悬浮精确已知大小的单个颗粒。对颗粒大小变化的测量非常敏感，通常小到0.1 nm，弹性光散射也能从散射光的角度依赖性中得到粒子组成和结构的信息。该研究将有助于了解与环境污染有关的气溶胶的物理化学过程，用于细粉生产的气溶胶反应器以及颗粒封装。

This research is an experimental study of (1) droplet growth and evaporation kinetics, (2) heterogeneous nucleation, adsorption and their film formation on particles, and (3) chemical identification of aerosols by Roman scattering. The experiments will employ electrodynamic balances to suspend single particles of accurately known size within a controlled environment. Extremely sensitive measurements of changes of particle size, often is small as 0.1 nm, will be detected by elastic light scattering which also gives information on particle composition and structure from the angular dependence of scattered light. The research should help understand physicochemical processes of aerosols which are relevant to environmental pollution, aerosol reactors for fine powder production, and particle encapsulation.