CAREER: Impacts of the Chemical and Physical Properties of Surfactants on the Hygroscopic Growth of Atmospheric Aerosol Particles

职业：表面活性剂的化学和物理性质对大气气溶胶颗粒吸湿生长的影响

• 批准号: 2239105
• 负责人: Amanda Frossard
• 金额: $ 73.01万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-03-01 至 2028-02-29
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2239105&HistoricalAwards=false
• 关键词: CAREER; Impacts; Chemical; Physical; Properties

This CAREER project focuses on the study of surfactant compounds in atmospheric aerosol and their effects on particle hygroscopic growth. Field collections and laboratory experiments using high resolution chemical and physical analyses will be used to assess the influence of surfactant molecular composition and associated properties on the hygroscopic growth of atmospheric particles. Hygroscopic growth can alter particle size and composition, both of which are important determinants in the influence of aerosol particles on visibility and human health.The effect of surfactants on particle hygroscopic growth is expected to be nonlinear and dependent on the surfactant molecular composition, structure, and critical micelle concentration. The experimental plan will address the following questions: (1) What are the compositions, structures, and interfacial properties of surfactants in atmospheric aerosol particles? How do these surfactant characteristics vary as a function of particle size and air mass source region (e.g., natural, anthropogenic, marine, aged influences)? (2) What effects do surfactant structure, composition, and interfacial properties have on the hygroscopic growth of submicron and supermicron aerosol particles? Chemical and physical measurements of aerosol particles collected as part of two field campaigns at the Skidaway Institute of Oceanography, on the coast of Georgia, will be made during two seasons to capture seasonal variability. Laboratory experiments will also be conducted to measure the hygroscopic growth of model laboratory-generated aerosol particles to determine the influence of the surfactant fraction directly. Multivariate statistics will be used to determine the surfactant properties in different particle types.The education and outreach plan includes working with high school students to collect local air quality measurements, developing a new laboratory course to explore the principles of analytical chemistry through measurements of aerosol chemistry, and conducting a first-year research seminar course and a summer research experience for undergraduate students.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.

这一职业项目的重点是研究大气气溶胶中的表面活性化合物及其对颗粒吸湿生长的影响。将使用高分辨率化学和物理分析进行实地收集和实验室实验，以评估表面活性剂分子组成和相关性质对大气颗粒吸湿生长的影响。吸湿生长可以改变颗粒的大小和组成，这两者都是气溶胶颗粒对能见度和人体健康影响的重要决定因素，表面活性剂对颗粒吸湿生长的影响是非线性的，依赖于表面活性剂的分子组成、结构和临界胶束浓度。该实验计划将解决以下问题：(1)大气气溶胶颗粒中表面活性剂的组成、结构和界面性质是什么？这些表面活性剂的特性如何随颗粒大小和空气质量来源区域的变化而变化(例如，自然、人为、海洋、老化的影响)？(2)表面活性剂的结构、组成和界面性质对亚微米和超微米气溶胶颗粒的吸湿生长有什么影响？作为佐治亚州海岸斯基德韦海洋研究所两个实地活动的一部分，将在两个季节对气溶胶颗粒进行化学和物理测量，以捕捉季节变化。还将进行实验室实验，以测量实验室产生的气溶胶粒子模型的吸湿性生长，以直接确定表面活性剂组分的影响。多元统计将被用来确定不同颗粒类型的表面活性物质的性质。教育和推广计划包括与高中生合作收集当地的空气质量测量结果，开发一门新的实验室课程以通过气溶胶化学测量来探索分析化学的原理，并为本科生开展一年的研究研讨会课程和夏季研究经验。该奖项反映了NSF的法定使命，并通过使用基金会的智力优势和更广泛的影响审查标准进行评估，被认为值得支持。