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本文利用共焦拉曼光谱在球形液滴的表面和中心可聚焦两次的特性,观测了不同RH(relative hu-midity,相对湿度)下疏水基底上Mg(CH3COO)2液滴与CO2在液滴表面和中心的反应情况。结果表明,反应生成的产物为碱式碳酸镁。当RH约73%时,液滴表面和中心生成的产物的量差别不大;当RH约65%时,表面和中心的差别较RH约73%时明显;而当RH降至约58%时,表面和中心的差别则变得非常明显。由于Mg(CH3COO)2液滴在较低相对湿度下会形成胶态结构,引起传质受阻,从而使得CO2由液滴表面扩散到内部变得越来越困难,最终导致液滴表面生成的产物比中心多。
In this paper, the properties of confocal Raman spectroscopy on the surface and the center of a spherical droplet can be focused twice, and the droplets of Mg (CH3COO) 2 and the presence of CO2 on the hydrophobic substrate at different RH (relative humidity) Drop surface and center of the reaction. The results show that the product of the reaction is basic magnesium carbonate. When the RH is about 73%, the amount of product formed on the surface and the center of the droplet is not significantly different; when the RH is about 65%, the difference between the surface and the center is pronounced at about 73% RH, whereas when RH drops to about 58% , The difference between the surface and the center becomes very obvious. As Mg (CH3COO) 2 droplets form a colloidal structure at lower relative humidity, causing mass transfer to be hindered, making it more and more difficult for CO2 to diffuse from the droplet surface to the interior, ultimately resulting in products formed on the droplet surface More than the center.