Multi-modal chemical characterization of highly viscous submicrometer organic particles
Multi-modal chemical characterization of highly viscous submicrometer organic particles
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DOI：
10.1080/02786826.2023.2266494
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发表时间：
2023-10
影响因子：
5.2
通讯作者：
A. Morales;Brianna N. Peterson;Steven A. L. Sharpe;Shelby M Huston;J. Tomlin;F. Rivera-Adorno;R. Moffet;Alla Zelenyuk;Alexander Laskin
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文献类型：
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作者：
A. Morales;Brianna N. Peterson;Steven A. L. Sharpe;Shelby M Huston;J. Tomlin;F. Rivera-Adorno;R. Moffet;Alla Zelenyuk;Alexander Laskin
摘要在复杂的大气气溶胶混合物中区分高粘性有机颗粒，并准确描述其组成、尺寸分布和混合状态，是气溶胶测量科学和技术的前沿挑战。在这里，我们提出了从互补的单粒子测量技术，用于深入表征高粘性颗粒获得的结果。我们展示了这种多模态颗粒表征方法的优势和协同作用的基础上形成的单个粘性颗粒的分析，在空气中排出的废物产生的一个共同的下水道管道修复技术。使用油浸流动显微镜，我们调查的粒径分布和形态的胶体成分存在于现场收集的废水冷凝液。我们比较这些结果与相应的测量中形成的粘性颗粒干燥液滴的雾化排放废物。发现胶体组分和粘性颗粒分别约为10 µm和0.5 µm。雾化的粘性颗粒表现出球形形态，而胶体颗粒出现明显的分形，类似于固化的复合材料的碎片。使用扫描电子显微镜和软X射线光谱显微镜技术进行化学成像的粘性颗粒收集在基板上。通过这些方法，出现了对这些颗粒的全面描述，证实了它们的高固体粘度，宽范围的尺寸，具有高氧化程度的不同碳形态，以及高有机体积分数。使用高通量单颗粒质谱法进一步表征雾化的粘性颗粒。该技术提供了大量单个颗粒的组成，大小和形态指标的实时测量，从而能够识别其独特的质谱特征。版权所有© 2023美国气溶胶研究协会图形摘要
Abstract Distinguishing highly viscous organic particles within complex mixtures of atmospheric aerosol and accurate descriptions of their composition, size distributions, and mixing states are challenges at the forefront of aerosol measurement science and technology. Here, we present results obtained from complementary single-particle measurement techniques employed for the in-depth characterization of highly viscous particles. We demonstrate advantages and synergy of this multi-modal particle characterization approach based on the analysis of individual viscous particles formed in the air-discharged waste produced by a common sewer pipe rehabilitation technology. Using oil immersion flow microscopy, we investigate particle size distributions and morphology of colloidal components present in field-collected aqueous waste condensates. We compare these results with corresponding measurements of viscous particles formed in drying droplets of the aerosolized discharged waste. The colloidal components and viscous particles were found to be approximately 10 µm and 0.5 µm, respectively. The aerosolized viscous particles exhibited a spherical morphology, while the colloidal particles appeared noticeably fractal, resembling fragments of a cured composite material. Chemical imaging of the viscous particles collected on substrates was performed using scanning electron microscopy and soft X-ray spectro-microscopy techniques. Through these methods, comprehensive description of these particles emerged, confirming their high solid-like viscosity, wide-ranging sizes, diverse carbon speciation with high degrees of oxygenation, and high organic volume fractions. The aerosolized viscous particles were further characterized using high-throughput single particle mass spectrometry. This technique provides real-time measurements of composition, size, and morphological metrics for large numbers of individual particles, enabling the identification of their distinct mass spectrometric signatures. Copyright © 2023 American Association for Aerosol Research Graphical Abstract