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.

该职业项目的重点是对大气气溶胶中表面活性剂化合物的研究及其对颗粒吸湿生长的影响。使用高分辨率化学和物理分析的现场收集和实验室实验将用于评估表面活性剂分子组成和相关特性对大气颗粒湿气生长的影响。吸湿生长可以改变粒径和成分，这两种都是气雾颗粒对可见性和人类健康影响的重要决定因素。表面活性剂对颗粒湿润量生长的影响预计是非线性的，并且取决于表面活性剂分子组成，结构，结构，结构和关键胶束浓度。实验计划将解决以下问题：（1）在大气气溶胶颗粒中，表面活性剂的组成，结构和界面特性是什么？这些表面活性剂特性如何随粒度和空气质量源区域的函数（例如自然，人为，海洋，老年影响）而变化？ （2）表面活性剂结构，组成和界面特性对亚微米和超平均气溶胶颗粒的吸湿生长具有什么影响？在佐治亚州海洋学研究所的两次现场运动中收集的气溶胶颗粒的化学和物理测量将在两个季节中进行捕获季节性变异性。还将进行实验室实验，以测量模型实验室生成的气溶胶颗粒的吸湿生长，以直接确定表面活性剂分数的影响。多元统计将用于确定不同粒子类型中的表面活性剂特性。教育和外展计划包括与高中生合作收集当地的空气质量测量值，开发新的实验室课程，以探索通过气溶胶化学的测量来探索分析化学原理，并通过一年级的研究课程和夏季研究的学生进行宣传。通过使用基金会的智力优点和更广泛影响的评论标准进行评估。