Fatty Acid Surfactant Photochemistry Results in New Particle Formation.
Fatty Acid Surfactant Photochemistry Results in New Particle Formation.
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DOI：
10.1038/s41598-017-12601-2
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发表时间：
2017-10-04
影响因子：
4.6
通讯作者：
George C
中科院分区：
文献类型：
--
作者：
Alpert PA;Ciuraru R;Rossignol S;Passananti M;Tinel L;Perrier S;Dupart Y;Steimer SS;Ammann M;Donaldson DJ;George C
存在于海洋表面微层或云滴表面活性剂涂层的有机界面高度浓缩，化学性质与下面的大部分或上覆的气相不同。因此，它们可能是化学或光化学反应的潜在独特位置。最近，挥发性有机化合物（VOCs）的光化学生产的报道在壬酸接口，然而，随后的二次有机气溶胶（SOA）颗粒的生产是无法被观察到的。我们调查SOA颗粒的形成，由于光化学反应发生在空气-水界面的模型饱和长链脂肪酸和醇的表面活性剂，壬酸和壬醇的存在下，分别。臭氧分解的气相光化学产物在黑暗中或在持续的紫外线照射下都导致SOA颗粒的成核和生长。壬醇的辐照没有产生可检测的VOC或SOA的产生。SOA的有机碳功能探测使用X射线显微光谱，并与其他实验室产生的和现场收集的颗粒进行比较。碳-碳双键被确定在凝聚相幸存臭氧分解过程中新的颗粒的形成和生长。发生在有机涂层表面的光化学过程的影响进行了讨论的海洋SOA颗粒大气通量的背景下。
Organic interfaces that exist at the sea surface microlayer or as surfactant coatings on cloud droplets are highly concentrated and chemically distinct from the underlying bulk or overlying gas phase. Therefore, they may be potentially unique locations for chemical or photochemical reactions. Recently, photochemical production of volatile organic compounds (VOCs) was reported at a nonanoic acid interface however, subsequent secondary organic aerosol (SOA) particle production was incapable of being observed. We investigated SOA particle formation due to photochemical reactions occurring at an air-water interface in presence of model saturated long chain fatty acid and alcohol surfactants, nonanoic acid and nonanol, respectively. Ozonolysis of the gas phase photochemical products in the dark or under continued UV irradiation both resulted in nucleation and growth of SOA particles. Irradiation of nonanol did not yield detectable VOC or SOA production. Organic carbon functionalities of the SOA were probed using X-ray microspectroscopy and compared with other laboratory generated and field collected particles. Carbon-carbon double bonds were identified in the condensed phase which survived ozonolysis during new particle formation and growth. The implications of photochemical processes occurring at organic coated surfaces are discussed in the context of marine SOA particle atmospheric fluxes.
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影响因子：
15
作者：
Fu H;Ciuraru R;Dupart Y;Passananti M;Tinel L;Rossignol S;Perrier S;Donaldson DJ;Chen J;George C
通讯作者：
George C
影响因子：
4.5
作者：
Aller, JY;Kuznetsova, MR;Kemp, PF
通讯作者：
Kemp, PF
影响因子：
4.4
作者：
Bigg, E. Keith;Leck, Caroline
通讯作者：
Leck, Caroline
影响因子：
64.8
作者：
KAWAMURA, K;GAGOSIAN, RB
通讯作者：
GAGOSIAN, RB
DOI：
10.1016/s0368-2048(02)00237-2
发表时间：
2003-01-01
影响因子：
1.9
作者：
Dhez, O;Ade, H;Urquhart, SG
通讯作者：
Urquhart, SG