Aerosol Coagulation and Morphology Studies

叙述：提出了用静态和动态光散射和电子显微检查来研究细颗粒气溶胶的凝固。目标是：l.确定分形概念描述气溶胶粒子形态的适用性以及这种分形形态如何依赖于Knudsen数；粒子间的相互作用，以及同步的表面生长。2. 为了测试气溶胶在整个Knudsen体系中凝固生长的时间尺度，并确定凝固核均匀性和动态分形维数对Knudsen数的依赖，粒子间的相互作用，以及同步的表面生长。3. 测量任意气溶胶粒径分布接近自保形态的方法，研究分形形貌对测量的影响。​4. 测量液体和固体颗粒气溶胶在中间克努森状态下的凝固速率。5. 表征气溶胶结块现象，确定其对凝固生长的影响。气溶胶将由油滴（DOP）或固体（NaCl, Ag）和预混火焰产生的煤烟产生。凝固前的尺寸在5-100纳米范围内。了解气溶胶凝聚，其速率和时间演变，以及它对所产生的簇形态的影响将有助于我们对气溶胶和凝聚过程的基本理解。

Narrative: It is proposed to study coagulation of fine particle aerosols using static and dynamic light scattering and electron micrography inspection. The goals are: l. To determine the applicability of the fractal concept to describe aerosol particle morphology and how this fractal morphology depends on Knudsen number, particle interactions, and concurrent surface growth. 2. To test temporal scaling of the coagulative growth of aerosols in the entire Knudsen regime and determine the dependence of the coagulation kernel homogeneity and dynamic fractal dimension on Knudsen number, particle interactions, and concurrent surface growth. 3. To measure the approach of an arbitrary aerosol particle size distribution to the self-preserving form and study the effects of fractal morphology on the measurement. 4. To measure the rate of coagulation in the intermediate Knudsen regime in both liquid and solid particle aerosols. 5. To characterize the phenomenon of aerosol clumping and determine its effect on coagulative growth. Aerosols will be created from either oil droplets (DOP) or solids (NaCl, Ag) and soot from premixed flames. Sizes will be in the 5-100 nm range before coagulation. An understanding of aerosol coagulation, its rate and temporal evolution, and its effect on the resultant cluster morphology will help our fundamental understanding of aerosols and the coagulative process.