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Impact of nanostructure, porosity and extent of oxidation on soot reactivity: Fullerenes, Nanotubes and Carbon Nanostructures: Vol 0, No 0

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Summary

Oxidation evolutions of construction, porosity and reactivity properties of 4 mannequin carbons (PU, S160, N330 and R250) with totally different preliminary reactivity have been studied. Outcomes confirmed that adjustments within the porosity and nanostructure properties as an alternative of preliminary properties considerably affected the soot reactivity throughout the soot oxidation course of. Two high-reactivity soot surrogate samples, i.e., PU and S160, initially introduced turbostratic disordered crystallites, leading to larger reactivity on the early oxidation stage. Oxidation primarily proceeded inwardly in a peeling style, and extra disordered inner crystallites have been uncovered after oxidized, barely growing the reactivity of PU and S160. Two low reactivity soot surrogate samples, i.e., N330 and R250, initially exhibited the everyday core–shell construction. The oxidation charges of N330 and R250 have been decrease than that of PU and S160 as a consequence of extra ordered exterior crystallites and fewer floor oxygen content material on the early oxidation stage. As soon as oxygen penetrated the particle core, many pores have been generated. Subsequent, the particle grew to become hole via inner burning of the extra reactive inner carbon on the late oxidation stage. After 40% burnoff, these hole buildings promoted oxidation in each outward and inward instructions. Due to this fact, oxidation charges of N330 and R250 considerably elevated.

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