Atmospheric Particle Formation in Two Systems: Sulfuric Acid (H2SO4)/Water (H2O) plus Ammonia (NH3) and/or Amines, and Oxidation Products from Organic Compounds

两个系统中大气颗粒的形成：硫酸 (H2SO4)/水 (H2O) 加氨 (NH3) 和/或胺，以及有机化合物的氧化产物

• 批准号: 2232189
• 负责人: David Hanson
• 金额: $ 38.94万
• 依托单位: Augsburg University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-12-01 至 2025-11-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2232189&HistoricalAwards=false
• 关键词: Atmospheric; Particle; Formation; Two; Systems

This project involves the conduct of new laboratory experiments to study fundamental processes underlying new particle formation in the atmosphere with a particular focus on the formation and growth of nanoparticles. There still exist uncertainties and knowledge gaps related to new particle formation, and this work will provide insights into new particle formation and enhance our understanding of the formation of clouds, as well as the impacts on a changing climate and human health. The experiments will be performed in two reactors developed in previous NSF-funded work. Undergraduate students, including those from underrepresented groups, will be trained and taught laboratory techniques over the course of this project.Two flow reactors, developed in previous NSF-funded work, will be used in this project: a Photolytic Flow Reactor (PhoFR) and a Growth Flow Reactor (GroFR). The experiments will provide fundamental knowledge pertaining to Gibbs energy, van der Waals effects, and the impact of particle phase composition of a H2SO4/NH3 system, as well as focus on organic particle formation from biogenic volatile organic compound oxidation. The experiments with the PhoFR include: (1) study the nucleation rates and cluster Gibbs energies in H2SO4/H2O and ternary (with NH3) systems under various temperatures; and (2) study the growth of seed particles by H2SO4 uptake as a function of seed particle size and composition, as well as determine the effects of van der Walls forces and the hygroscopicity of nanoparticles. The experiments with the GroFR include: (1) study the effect of seed particle size and growth during the photooxidation of monoterpenes; (2) study the synthesis of first-generation oxidation products of monoterpenes and related compounds; and (3) the deployment of a mass spectrometer.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.

该项目涉及进行新的实验室实验的进行研究，以研究大气中新颗粒形成的基本过程，并特别关注纳米颗粒的形成和生长。仍然存在与新粒子形成有关的不确定性和知识差距，这项工作将为新的粒子形成提供见解，并增强我们对云层形成的理解，以及对不断变化的气候和人类健康的影响。实验将在以前的NSF资助工作中开发的两个反应器中进行。在该项目的过程中，将对本科生（包括代表性群体不足的人群）进行培训和教授实验室技术的本科生。该项目将在以前的NSF资助工作中开发的两个流动反应器：光解反应堆（PHOFR）（PHOFR）和一个生长流动反应器（GROFR）（GROFR）。该实验将提供与吉布斯能量，范德华效应以及H2SO4/NH3系统颗粒相组成的影响以及关注生物挥发性有机复合氧化的有机颗粒形成的基本知识。 PHOFR的实验包括：（1）研究在各种温度下H2SO4/H2O和三元（NH3）系统中的成核速率和簇吉布斯能量； （2）通过H2SO4摄取来研究种子颗粒的生长，这是种子粒径和成分的函数，并确定范德尔壁力和纳米颗粒的吸湿性的影响。 Grofr的实验包括：（1）研究单二烯的光氧化过程中种子粒度和生长的影响； （2）研究单二烯和相关化合物的第一代氧化产物的合成； （3）质谱仪的部署。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子优点和更广泛影响的审查标准来评估值得支持的。