Voss Laura F, Hadad Christopher M, Allen Heather C
Department of Chemistry, The Ohio State University, 100 West 18 Avenue, Columbus, 43210, USA.
J Phys Chem B. 2006 Oct 5;110(39):19487-90. doi: 10.1021/jp062595b.
Competition and oxidation of fatty acids spread at the air/water interface were investigated using surface-specific, broad-bandwidth, sum frequency generation spectroscopy. At the air/water interface, a monolayer of oleic acid replaced a monolayer of deuterated palmitic acid at equilibrium spreading pressure. Subsequent oxidation of the oleic acid monolayer with ozone resulted in products more water soluble than the palmitic acid; therefore, the palmitic acid monolayer reformed at the surface. Results indicate that the surfactants on the surface of fat-coated tropospheric aerosols will only possess oxidized acyl chains after all less soluble species in the aqueous subphase have been removed through the processes of replacement at the surface and atmospheric oxidation.
使用表面特异性、宽带宽和频产生光谱研究了脂肪酸在空气/水界面的竞争和氧化。在空气/水界面，油酸单层在平衡铺展压力下取代了氘代棕榈酸单层。随后用臭氧氧化油酸单层，产生的产物比棕榈酸更易溶于水；因此，棕榈酸单层在表面重新形成。结果表明，脂肪包裹的对流层气溶胶表面的表面活性剂只有在水相中所有溶解度较低的物种通过表面置换和大气氧化过程被去除后，才会具有氧化的酰基链。
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