Production, Dynamic Behavior and Measurement of Small Aerosol Particles

对气溶胶研究进一步推进所涉及的各个项目进行了综合研究，主要内容概括如下：1.细粒子的产生对于气态物质成核过程的理论研究，如气体分子的粘附率以及实验技术的改进等，仍存在着本质上的问题。生产均匀尺寸的细颗粒是工业使用细颗粒的基本要求之一，2)和3)项中开发的组合技术将是进一步研究的有用方法。粒子动力学利用四极池成功地将单个粒子悬浮在池中，这项技术有望在气溶胶的基础实验研究中非常有用，如粒子的测量、粒子的物理和物理化学表征以及动力学研究。将需要进一步的技术措施来扩展i…更适用于更大尺寸范围的颗粒。在激光照射下，观察到了吸光颗粒的一些特殊行为。粒子加热和加热粒子的动力学被认为是解释这些现象的特别重要的因素。对光散射技术在气溶胶颗粒测量中的应用进行了较为全面的研究。角散射测量与开尔文池动态光散射(光子相关光谱)相结合，被认为是最适合于细颗粒原位测量的方法。在PCS.4中使用的数据反演技术仍需进一步改进。研究了大气气溶胶粒子诱发X射线发射(PIXE)方法，并将其应用于Uji、大阪和维也纳地区的大气颗粒物的元素分析，目前正在研究其局地特征。将继续就该项目开展进一步的联合工作。在这项联合工作中讨论的另一个重要议题是大气气溶胶对全球气候的贡献，目前正在考虑一项持续的联合研究计划。较少

Comprehensive studies were carried out jointly on various items involved in further advancement of aerosol research, and the main topics are summarized as follows ;1. Production of fine particlesAs for the theoretical study of nucleation processes from gaseous matter, there still remain essential unsolved problems such as the sticking probability of gas molecules, as well as the improvement in experimental techniques. Production of homogeneous sized fine particles is one of the essential requirement for industrial use of fine particles, and the combined techniques developed in items 2) and 3) will be useful method for further research.2. Dynamics of particlesA quadrupole cell was successfully utilized for levitating a single particle in a cell, and this technique is expected to be extremely useful for basic experimental research of aerosols such as sizing, physical and physico-chemical characterization and dynamics study of particles. Further technical ements will be needed to extend i … More ts applicability to more wider size range of particles. Some peculiar behaviors were observed for light-absorbing particles under the irradiation of laser beam. Particle heating and dynamics of heated particles are thought of special importance to elucidate these phenomena.3. Measurement of particlesApplication of light scattering techniques to sizing of aerosol particles was studied comprehensively. Angular scattering measurement in combination with Kelvin cell dynamic light scattering (photon correlation spectroscopy, PCS) were confirmed to be most useful for in-situ measurement of fine particles. Further improvement is still required for data inversion technique used in PCS.4. Atmospheric aerosolsParticle induced X-ray Emission (PIXE) method was studied applied to elemental analysis of airborne particulates sampled at the areas of Uji, Osaka and Vienna, and the local features are now being examined. Further joint works will be continued with this item. Another important topic discussed during this joint work was the contribution of atmospheric aerosols to the global climate, and a continuing joint research program is now under consideration. Less