Abstract Herein, we investigate the mechanism of soot formation produced by controlled-temperature pyrolysis of ethylene in Ar, He, or N2 and analyze the size distributions of soot particles to understand soot aggregation and nucleation behavior. Additionally, we probe the reactivity of soot, revealing that soot particles were highly unlikely to react with molecules of the above carrier gases. The use of Ar is demonstrated to promote soot production, facilitate crystalline growth, and increase the diameter of primary soot particles, while the use of He has an opposite effect, which is ascribed to the large size of the former molecules and the small size of the latter ones. Consequently, the soot generation mechanism is found to be affected by carrier gas type.

中文翻译：

---

载气对乙烯热解烟尘性质的影响

摘要 在此，我们研究了乙烯在 Ar、He 或 N2 中受控温度热解产生的烟尘形成机制，并分析了烟尘颗粒的尺寸分布以了解烟尘聚集和成核行为。此外，我们探测了烟灰的反应性，发现烟灰颗粒极不可能与上述载气分子发生反应。已证明使用 Ar 可促进烟尘产生、促进晶体生长并增加初级烟尘颗粒的直径，而使用 He 具有相反的效果，这归因于前者分子的大尺寸和小尺寸后者。因此，发现烟灰产生机制受载气类型的影响。