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Collaborative Research: Evolution and Impact of Aerosol Phase and Morphology

合作研究：气溶胶相和形态的演变和影响

基本信息

批准号：
1916819
负责人：
Murray Johnston
金额：
$ 25.12万
依托单位：
University of Delaware
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-07-01 至 2023-06-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1916819&HistoricalAwards=false
关键词：
Collaborative Research Evolution Impact Aerosol

项目摘要

This project includes both experimental and modeling studies to investigate processes that occur during the formation and aging of small particles in the atmosphere. Small organic particles can separate into liquid phases that then can change the subsequent chemistry of the atmosphere. Experiments will be conducted to study how particle properties such as size, shape, and composition affect particle phase separation. Models will be used to study the impacts these particles have on the atmosphere.The hypothesis of the project is that the liquid-liquid phase separation (LLPS) process is governed by the molecular composition of the particle and the particle size. This hypothesis will be tested using secondary organic aerosol (SOA) produced from the dark ozonolysis of alpha-pined and the photooxidation of 1,2,4-trimethylbenzene in a flow reactor. Particles will be collected, and their morphology will be analyzed by cryotransmission electron microscopy. The research questions that will be addressed by the proposal are the following: (1) What particle-level parameters (O:C, organic:sulfate ratio, size, etc.) determine particle morphology? (2) How does the morphology of aerosol particles evolve in time? Specifically, how do the size of particles and aging influence particle morphology? and (3) What is the impact of aerosol morphology on aerosol processes such as heterogeneous N2O5 hydrolysis? A particle-resolved modeling framework will make use of the experimental results and integrate them to quantify the relevance of the findings for atmospheric chemistry.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.

该项目包括实验和建模研究，以调查在大气中小颗粒的形成和老化过程中发生的过程。小的有机颗粒可以分离成液相，然后可以改变大气的后续化学性质。将进行实验以研究颗粒特性如尺寸、形状和组成如何影响颗粒相分离。该项目的假设是液-液相分离过程是由颗粒的分子组成和颗粒的大小决定的。这一假设将使用二次有机气溶胶（SOA）进行测试，从暗臭氧分解的α-pined和光氧化的1，2，4-三甲基苯在流动反应器中。将收集颗粒，并通过冷冻透射电子显微镜分析其形态。该提案将解决的研究问题如下：（1）什么颗粒级参数（O：C，有机：硫酸盐比例，尺寸等）。确定颗粒形态？(2)气溶胶粒子的形态如何随时间演变？具体来说，颗粒尺寸和老化如何影响颗粒形态？和（3）气溶胶形态对气溶胶过程（例如非均相N2 O 5水解）有何影响？一个粒子分辨的模型框架将利用实验结果，并将其整合，以量化大气化学研究结果的相关性。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的知识价值和更广泛的影响审查标准进行评估的支持。