Abstract Spark discharge generators enable a fast, reliable, continuous, and highly reproducible production of nanoparticle aerosols along with a widely tunable size distribution. Graphite spark discharge generators have been particularly applied for studies of instrument calibration, filter testing, soot reactivity studies, and in toxicological risk evaluation of soot. Until now, it has been consensus that soot produced in spark discharge generators is highly reactive because of its high surface area and its amorphous nanostructure. In this paper, we will demonstrate that the properties of soot produced in spark discharge generators strongly depend on the used carrier gas (i.e. argon, nitrogen). Soot produced in argon (spark discharge argon soot, SDS-Ar) as carrier gas is composed of a major fraction with high reactivity exhibiting a temperature at maximum oxidation rate Tmax between 796 K and 803 K. Soot produced in nitrogen (spark discharge nitrogen soot, SDS-N2) has a similar size distribution as SDS-Ar, whereas the main fraction is less reactive (963 K

中文翻译：

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火花放电产生的烟灰：不同的纳米结构和不同合成条件下的分子氧氧化反应

摘要 火花放电发生器能够快速、可靠、连续和高度可重复地生产纳米颗粒气溶胶，并具有广泛可调的尺寸分布。石墨火花放电发生器特别适用于仪器校准、过滤器测试、烟灰反应性研究和烟灰毒理学风险评估的研究。迄今为止，人们一致认为火花放电发生器中产生的烟灰具有高反应性，因为它具有高表面积和无定形纳米结构。在本文中，我们将证明火花放电发生器中产生的烟灰的特性很大程度上取决于所使用的载气（即氩气、氮气）。在氩气中产生的烟尘（火花放电氩烟尘，