Structure of Single Aqueous MgSO4 Droplets Ultrasonically Levitated in the Air: Supersaturation and Crystallization

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2023-08-01 DOI:10.1007/s10953-023-01309-9

Toshio Yamaguchi, Shun-ichiro Matsuo, Koji Yoshida, Tsutomu Kurisaki, Shoji Ishizaka, Koji Ohara

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Abstract

Aerosol droplets are fully involved in forming clouds and play a critical role in global climate change. The investigation of the properties, speciation, and structure of aerosol droplets at a molecular level is highly needed for understanding the physicochemical behaviors and processes of aerosol droplets. We investigate the composition, speciation, and structure of a single aqueous MgSO₄ droplet of 1 mm size ultrasonically levitated in the air and bulk solutions under ambient conditions by in situ Raman and synchrotron X-ray scattering. The composition and speciation are determined by measuring Raman spectra of the sulfate ion’s S–O band and water’s O–H bands. The X-ray data are subjected to empirical potential structure refinement modeling to extract the site–site pair correlation function, coordination number distribution, and 3-D structure for the ion solvation, association, and solvent water. In situ X-ray scattering measurements observe the crystallization of MgSO₄ hydrates from a droplet.

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超声悬浮在空气中的MgSO4液滴的结构:过饱和和结晶

气溶胶滴充分参与了云的形成，并在全球气候变化中发挥着关键作用。要了解气溶胶液滴的物理化学行为和过程，亟需在分子水平上研究气溶胶液滴的性质、种类和结构。我们通过原位拉曼和同步辐射 X 射线散射，研究了在空气中超声悬浮的单个 1 毫米大小的 MgSO4 水溶液液滴和环境条件下的块状溶液的组成、种类和结构。通过测量硫酸根离子的 S-O 波段和水的 O-H 波段的拉曼光谱，确定其成分和种类。对 X 射线数据进行经验势能结构细化建模，以提取离子溶解、结合和溶剂水的位点对相关函数、配位数分布和三维结构。原位 X 射线散射测量观察到 MgSO4 水合物从液滴中结晶。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.