Selectivity Across the Interface: A Test of Surface Activity in the Composition of Organic-Enriched Aerosols from Bubble Bursting
Selectivity Across the Interface: A Test of Surface Activity in the Composition of Organic-Enriched Aerosols from Bubble Bursting
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DOI：
10.1021/acs.jpclett.6b00489
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发表时间：
2016-05-05
影响因子：
5.7
通讯作者：
Grassian, Vicki H.
中科院分区：
文献类型：
--
作者：
Cochran, Richard E.;Jayarathne, Thilina;Grassian, Vicki H.
虽然已经开发了描述在空气-水界面处的有机分子的表面活性的理论，但是很少有研究测试表面活性如何影响在气泡破裂期间分子从溶液相到气溶胶相的选择性转移。一系列的有机化合物，不同的溶解度和表面活性从溶液到气溶胶相的选择性转移是第一次量化实验。气溶胶是由含有盐和一系列线性羧酸盐（LC）和二羧酸盐（LDCs）的溶液使用气泡破裂过程产生的。这些分子的表面活性主导了跨界面的转运，表面活性更高的C-4-C-8 LC的富集因子（55 +/- 8）大于C-4-C-8 LDC的富集因子（5 +/- 1）。在液体-空气界面的LC的估计表面浓度的趋势一致，以及其在气溶胶相的相对浓度。此外，富集的LC其次是富集钙相对于其他无机阳离子和消耗的氯化物和硫酸盐。
Although theories have been developed that describe surface activity of organic molecules at the air water interface, few studies have tested how surface activity impacts the selective transfer of molecules from solution phase into the aerosol phase during bubble bursting. The selective transfer of a series of organic compounds that differ in their solubility and surface activity from solution into the aerosol phase is quantified experimentally for the first time. Aerosol was produced from solutions containing salts and a series of linear carboxlyates (LCs) and dicarboxylates (LDCs) using a bubble bursting process. Surface activity of these molecules dominated the transport across the interface, with enrichment factors of the more surface-active C-4-C-8 LCs (55 +/- 8) being greater than those of C-4-C-8 LDCs (5 +/- 1). Trends in the estimated surface concentrations of LCs at the liquid-air interface agreed well with their relative concentrations in the aerosol phase. In addition, enrichment of LCs was followed by enrichment of calcium with respect to other inorganic cations and depletion of chloride and sulfate.