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Probing the Roles of the Surface versus the Bulk in Uptake of Gases Into Atmospherically Relevant Particles

探讨表面与本体在气体吸收到大气相关颗粒中的作用

基本信息

批准号：
1916993
负责人：
Lisa Wingen
金额：
$ 64.88万
依托单位：
University of California-Irvine
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：
2019-06-01 至 2023-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1916993&HistoricalAwards=false
关键词：
Probing Roles Surface versus Bulk

项目摘要

This research project involves an investigation into the role of the atmospheric particle surface versus the particle bulk composition in determining the uptake of organic gases and water into the particle. This information is critical for the development of models to accurately predict the impacts of airborne particles on air quality, visibility and climate.The specific objectives of this research are to: (1) examine the surface and bulk composition of a series of model solid organic particles both before and after heterogeneous oxidation using cutting edge mass spectrometry techniques implemented recently in this laboratory; (2) probe differences in surface vs bulk composition when oxidation of the organic is initiated from the gas phase ("outside in"), or from in-situ photochemistry induced by nitrate or nitrite ion photolysis ("inside out"); and (3) measure uptake of a range of organics as well as water into the above particles, before and after oxidation, in order to establish molecular relationships between gas-particle interactions and surface and bulk composition, and the impacts on particle growth and hygroscopicity. A series of laboratory experiments will be conducted to examine the uptake of a range of organic vapors onto model particles before and after oxidation. The data generated by this effort will provide critical insights to improve predictions of particle impacts on climate, air quality, and human health.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.

该研究项目涉及到大气颗粒表面与颗粒体组成的作用，在确定吸收的有机气体和水进入颗粒的调查。本研究的具体目标是：（1）利用本实验室最近采用的最先进的质谱技术，研究一系列固体有机颗粒物模型在非均相氧化前后的表面和体相组成;（2）当有机物的氧化从气相开始时，探测表面与本体组成的差异（“由外而内”），或由硝酸根或亚硝酸根离子光解引起的原位光化学（“里外”）;和（3）在氧化之前和之后，以建立气体-颗粒相互作用与表面和本体组成之间的分子关系，以及对颗粒生长和吸湿性的影响。一系列的实验室实验将进行检查的范围内的有机蒸汽的模型颗粒的吸收之前和之后的氧化。通过这项工作产生的数据将提供关键的见解，以改善对气候，空气质量和人类健康的颗粒影响的预测。这个奖项反映了NSF的法定使命，并已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。