Collaborative Research: RUI: The role of interactions between organic components on aerosol hygroscopicity

合作研究：RUI：有机成分之间的相互作用对气溶胶吸湿性的作用

• 批准号: 2124491
• 负责人: Dabrina Dutcher
• 金额: $ 17.55万
• 依托单位: Bucknell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2124491&HistoricalAwards=false
• 关键词: Collaborative; Research; RUI; role; interactions

This award is funded in whole or in part under the American Rescue Plan Act of 2021 (Public Law 117-2). The goal of this project is to characterize the impact of mixed organic fractions on the hygroscopicity of aerosol in the presence of inorganic ammonium sulfate. The PIs postulate that the systematic differences in organic-organic interactions will impact the dissolution process during water uptake, activation, and subsequent droplet formation and will modify the ability of compounds to partition to the droplet surface, influencing water uptake and cloud condensation nuclei (CCN) activity. This research will improve predictions of the direct and indirect effects of aerosols on radiative forcing and climate.The hypothesis of this proposal is that changes to the morphology of a system consisting of ammonium sulfate, an organic compound that undergoes liquid-liquid phase separation, and an additional organic compound will depend on the solubility and surface activity of the additional organic compound. As the concentration of the second organic compound is varied, the particles’ morphology will change, causing differences between theoretical and measured hygroscopicity. The PIs propose to characterize the following systems: (1) mixtures of ammonium sulfate and a highly soluble organic compound that is not surface active; (2) mixtures of ammonium sulfate and a surface-active organic compound; and (3) mixtures of ammonium sulfate and a highly surface-active organic compound (surfactant).This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项全部或部分由《2021 年美国救援计划法案》（公法 117-2）资助。该项目的目标是表征混合有机组分对无机铵存在下气溶胶吸湿性的影响。 PI 假设有机-有机相互作用的系统差异将影响吸水、活化和随后的液滴形成过程中的溶解过程，并将改变化合物的能力。该研究将改善气溶胶对辐射强迫和气候的直接和间接影响的预测。该提案的假设是，气溶胶形态的变化。由硫酸铵、进行液-液相分离的有机化合物和附加有机化合物组成的系统将取决于附加有机化合物的溶解度和表面活性，因为第二有机化合物的浓度为。颗粒的形态会发生变化，从而导致理论吸湿性和测量吸湿性之间的差异，PI 建议对以下系统进行不同的表征：(1) 硫酸铵和非表面活性的高溶解性有机化合物的混合物；(2) 铵的混合物。硫酸盐和非表面活性的高溶解性有机化合物；硫酸铵和表面活性有机化合物；以及（3）硫酸铵和高表面活性有机化合物（表面活性剂）的混合物。该奖项反映了 NSF 的法定使命和有通过使用基金会的智力优点和更广泛的影响审查标准进行评估，被认为值得支持。