团簇状碳黑颗粒在丙烯臭氧氧化和光氧化体系中的重构

大气中的碳黑颗粒具有不规则的分形团簇结构. 以电火花放电产生的团簇碳黑颗粒为研究对象，发现颗粒的团簇结构在丙烯臭氧氧化和光氧化体系中均发生重构，形成更为紧实的结构. 研究表明这种重构是由丙烯氧化产生的过氧自由基和羟基自由基引起的. 研究结果有助于对大气中团簇状碳黑颗粒老化过程的进一步了解. 由于重构直接改变了颗粒的粒径分布，这一过程可能导致碳黑颗粒在大气中物理化学特性的重大改变. 关键词： 团簇碳黑颗粒 重构 丙烯 烟雾箱

The reconstructing of soot agglomerates in propene ozonolysis and photooxidation systems

The soot in the atmosphere exhibits irregular fractal agglomerate structure. In this study, the reconstruction of agglomerate structure is observed for soot generated by spark discharge in both propene ozonolysis and photooxidation systems. This process makes the agglomerate soot more compact, and is possibly caused by the peroxy radicals and hydroxyl radicals generated from propene oxidation. The result furthers our understanding of the atmospheric aging process of soot agglomerate. Since the reconstruction directly changes the size distribution of soot, it may induce important changes to the soot's physical and chemical properties in the atmosphere.