Characterization of adhesivity of organic enriched sea spray aerosols by atomic force microscopy
Characterization of adhesivity of organic enriched sea spray aerosols by atomic force microscopy
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DOI：
10.1016/j.atmosenv.2022.119468
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发表时间：
2022-11
影响因子：
5
通讯作者：
Kohei Ono;Ayumi Iwata;T. Fukuma;Yoko Iwamoto;K. Hamasaki;A. Matsuki
中科院分区：
文献类型：
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作者：
Kohei Ono;Ayumi Iwata;T. Fukuma;Yoko Iwamoto;K. Hamasaki;A. Matsuki
气溶胶颗粒不仅在空气中传播，甚至在沉积后也会引发各种环境问题。例如，高度腐蚀性的海喷雾气溶胶（SSA）可沉积在表面上，对钢铁或混凝土基础设施造成损害，特别是在沿海地区。然而，在何种程度上的SSA的粘合行为的影响，不同程度的有机混合尚未得到充分的研究。本研究的目的是评估的粘附力的实验室产生的和周围的SSA与各种有机内容在单个粒子的基础上，使用原子力显微镜。气溶胶也产生使用散装海泡沫样品收集的诺托半岛，日本海岸模拟SSA丰富的海洋有机物的复杂混合物。将海水泡沫颗粒的粘附力与两种类型的标准单糖（葡萄糖和岩藻糖）、人工无机海盐（ASS）、不同质量比的葡萄糖和ASS混合物以及环境海盐（SS）颗粒的粘附力进行比较。纯单糖或其混合物显示出比主要无机颗粒如ASS和SS大得多的粘附力。此外，发现一部分海泡沫颗粒显示出类似的大粘附力，这表明有机（例如，单糖）富集的SSA可以比无机盐具有更大的粘附性。此外，在环境气溶胶中也发现了一些但令人惊讶的粘性颗粒。因此，有必要考虑到有机物的丰度，如有机物，以正确评价SSA的粘附性。
Aerosol particles can trigger various environmental issues, not only when they are airborne but even after their deposition. For example, highly corrosive sea spray aerosols (SSA) can be deposited on surfaces and cause damage to steel- or concrete-based infrastructure, especially in coastal areas. However, the extent to which the adhesive behavior of SSA is affected by different degrees of organic mixing has not been sufficiently studied. The goal of this study was to evaluate the adhesion forces of both laboratory-generated and ambient SSA with a variety of organic contents on an individual particle basis using atomic force microscopy. Aerosols were also generated using a bulk sea foam sample collected from the coast of Noto Peninsula, Japan to simulate SSA enriched in a complex mixture of marine organics. The adhesion force of the sea foam particles was compared with that of two types of standard monosaccharides (glucose and fucose), artificial inorganic sea salt (ASS), glucose and ASS mixtures at different mass ratios, and ambient sea salt (SS) particles. Pure monosaccharide or its mixtures showed substantially larger adhesion forces than predominantly inorganic particles such as ASS and SS. In addition, it was found that a fraction of sea foam particles showed similarly large adhesion forces, suggesting that organic (e.g., monosaccharides)-enriched SSA can be considerably more adhesive than inorganic salts. Furthermore, a few but surprisingly adhesive particles were also identified among ambient aerosols. Therefore, it is necessary to consider the abundance of organics such as saccharides to correctly evaluate the adhesivity of SSA.