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Atmospheric Reactivity of Fullerene (C60) Aerosols
ACS Earth and Space Chemistry ( IF 3.4 ) Pub Date : 2018-01-05 00:00:00 , DOI: 10.1021/acsearthspacechem.7b00116
Dhruv Mitroo 1 , Jiewei Wu 1 , Peter F. Colletti 1 , Seung Soo Lee 1 , Michael J. Walker 1 , William H. Brune 2 , Brent J. Williams 1 , John D. Fortner 1
Affiliation  

Rapid growth and adoption of nanomaterial-based technologies underpin a risk for unaccounted material release to the environment. Carbon-based materials, in particular fullerenes, have been widely proposed for a variety of applications. A quantitative understanding of how they behave is critical for accurate environmental impact assessment. While their aqueous phase reactivity, fate, and transport have been studied for over a decade, aerosol phase reactivity remains unexplored. Here, the transformation of C60, as nanocrystal (nC60) aerosols, is evaluated over a range of simulated atmospheric conditions. Upon exposure to UV light, gas-phase O3, and OH, nC60 is readily oxidized. This reaction pathway is likely limited by diffusion of oxidants within/through the nC60 aerosol. Further, gas-phase oxidation induces disorder in the crystal structure without affecting aerosol (aggregate) size. Loss of crystallinity suggests aged nC60 aerosols will be less effective ice nuclei, but an increase in surface oxidation will improve their cloud condensation nuclei ability.

中文翻译:

富勒烯(C 60)气溶胶的大气反应性

基于纳米材料的技术的快速增长和采用为未解释的材料释放到环境中带来了风险。碳基材料,特别是富勒烯,已被广泛建议用于多种应用。对它们的行为进行定量了解对于准确的环境影响评估至关重要。尽管已经研究了它们的水相反应性,结局和运输性,但是气溶胶相反应性仍未得到探索。在此,在一系列模拟大气条件下评估了作为纳米晶体(n C 60)气溶胶的C 60的转变。暴露于紫外光,气相O 3 OH,n C 60容易被氧化。该反应途径可能受到氧化剂在n C 60气雾剂内部/中的扩散的限制。此外,气相氧化在不影响气溶胶(聚集体)尺寸的情况下引起晶体结构的无序。结晶度的损失表明,老化的n C 60气溶胶的冰核作用较差,但表面氧化的增加将改善其云凝结核的能力。
更新日期:2018-01-05
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