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在21°C和3°C的多元组件薄膜中,在空气-水接口上氧化烯酸单层的氧化

Ben Woden¹, Yizhou Su², Maximilian W A Skoda³

¹Department of Chemistry, University of Reading, Reading, UK.

Faraday discussions

|March 3, 2025

概括

在空气-水界面上,酸薄膜 (LOA) 的臭氧氧化表明反应速率在不同温度下是相似的. 多元组件薄膜会影响氧化途径,强调在研究中需要现实的大气条件.

科学领域:

大气化学大气化学
表面科学是一门学科.
化学动力学化学动力学

背景情况:

水性气溶含有表面活性物种,如脂肪酸.
酸 (LOA) 是海洋喷雾和排放中的一个关键成分.
了解LOA与臭氧的反应对于大气过程至关重要.

研究的目的:

研究一分子薄的LOA薄膜被臭氧氧化的情况.
检查空气-水接口上的多元件膜中的LOA行为.
确定温度和共同沉积物种对LOA氧化动力学的影响.

主要方法:

中子反射计用于实时监测薄膜动力学.
脱的LOA (d-LOA) 氧化为单层和与油酸 (h-OA) 或甲基油酸 (h-MO) 混合物.
实验在室温和3±1°C的温度下进行,且具有大气相关的臭氧水平.

主要成果:

在测试温度 (1.92.5 × 10-10 cm2 s-1) 中,氧化率相似.
同时沉积的薄膜成分 (h-OA,h-MO) 影响了单过程衰变的偏差,表明氧化途径发生了变化.
纯的d-LOA显示出与单一过程衰变的最明显的偏差,表明了自氧化.

结论:

温度对LOA氧化动力学的影响很小,但可能会影响残留物形成.
多组分混合物和大气中现实的臭氧度对于准确的LOA行为研究至关重要.
这些发现对于了解有机物在水滴上的持久性和更广泛的大气影响至关重要.

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