Oxidized Aromatic鈥揂liphatic Mixed Films at the Air鈥揂queous Solution Interface

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• 作者：Elizabeth C. Griffith ; Teobaldo R. C. Guizado ; Andre S. Pimentel ; Geoffrey S. Tyndall ; Veronica Vaida
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 31, 2013
• 年：2013
• 卷：117
• 期：43
• 页码：22341-22350
• 全文大小：552K
• 年卷期：v.117,no.43(October 31, 2013)
• ISSN：1932-7455

文摘

Mixed organic films composed of molecules with differing hydrophobic groups are relevant to environmental interfaces such as the surface of atmospheric aerosols due to the complex composition of atmospheric emissions. In this work, mixed films composed of oxidized aromatics (benzaldehyde, benzoic acid) and stearic acid are studied using Langmuir trough methods, infrared reflection鈥揳bsorption spectroscopy (IRRAS), and MD simulations, showing modifications to the surface due to both the hydrophobic and hydrophilic identity of the aromatic molecules. Aromatics are a known component of crude oil, and once released into the atmosphere through an event such as an oil spill, they can be weathered to produce varying degrees of oxidized products like benzaldehyde or benzoic acid. Molecules released through such anthropogenic processes are shown here to have complex interactions with organics released through biogenic emissions (like stearic acid) at the aqueous interface, resulting in diverse surface morphologies that may have an effect on the aerosol particle鈥檚 overall effect on atmospheric chemistry and climate. The result of these mixed films is discussed in the context of the modern atmosphere.