Molecular Orientation at the Squalene/Air Interface from Sum Frequency Generation Spectroscopy and Atomistic Modeling.

Molecular Orientation at the Squalene/Air Interface from Sum Frequency Generation Spectroscopy and Atomistic Modeling.
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通过和频发生光谱和原子建模研究角鲨烯/空气界面的分子取向

DOI:
10.1021/acs.jpcb.0c11158
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发表时间:
2021
期刊:
The journal of physical chemistry. B
影响因子:
--
通讯作者:
D. J. Tobias
D. J. Tobias
中科院分区:
--
文献类型:
--
作者:
M. von Domaros;Y. Liu;J. L. Butman;E. Perlt;F. M. Geiger;D. J. Tobias

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人体皮肤油是室内环境中大气氧化剂的重要清除剂,角鲨烯是主要的臭氧活性成分。在这里,我们提出了一个相结合的光谱和原子建模方法来阐明角鲨烯在空气/油界面的构象和取向的偏好及其与臭氧的反应的影响。我们发现,角鲨烯链有一种倾向,与表面正常对齐,导致不同浓度的各种类型的双键,从而不同的反应性。我们还观察到在这种疏水化合物的表面存在水。这两项研究结果可能对描述室内空气化学这一重要方面的动力学模型的设计和结果产生影响。
Human skin oils are significant scavengers of atmospheric oxidants in occupied indoor environments, and squalene is a major ozone-active constituent. Here, we present a combined spectroscopic and atomistic modeling approach to elucidate the conformational and orientational preferences of squalene at the air/oil interface and their implications for reactions with ozone. We find that squalene chains have a tendency to align with the surface normal, resulting in different concentrations of the various types of its double bonds and thus different reactivities. We also observe the presence of water at the surface of this hydrophobic compound. Both findings have possible implications for the design and outcomes of kinetic models describing this important aspect of indoor air chemistry.
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