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Nanoparrticle Growth Mechanisms During New Particle Formation

新粒子形成过程中的纳米粒子生长机制

基本信息

批准号：
1408455
负责人：
Murray Johnston
金额：
$ 44万
依托单位：
University of Delaware
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2014
资助国家：
美国
起止时间：
2014-09-01 至 2017-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1408455&HistoricalAwards=false
关键词：
Nanoparrticle Growth Mechanisms During New

项目摘要

In this project funded by the Environmental Chemical Sciences program in the Division of Chemistry at the National Science Foundation, Professor Murray Johnston of the University of Delaware is studying the chemical mechanisms by which nanoparticles grow in the atmosphere. This project will support the work of three graduate students. These students will be broadly trained and capable of pursuing a career in areas such as environmental chemistry, industrial analytical chemistry, instrumentation, nanoscience, or academia. Society will benefit by training students who are able to predict how changes in human activity affects climate. Professor Johnston and graduate students will also work to increase awareness of environmental science among University of Delaware undergraduates and the general public, by incorporating the concepts and results of this work into formal coursework and public outreach events.Nanoparticles that grow fast enough, can reach a size where they serve as the seeds to form cloud droplets. Understanding how these particles grow will assist the development of improved models to predict cloud formation and its impact on climate. Current regional and global atmospheric models are limited in their ability to predict the contribution of carbonaceous matter to nanoparticle growth rates during new particle formation (NPF). This knowledge gap represents the greatest remaining uncertainty for determining the impact of NPF on today's climate and climate forcing (the difference between pre-industrial times and now). The specific objective of the proposed work is to elucidate chemical mechanisms of nanoparticle growth by carbonaceous matter during NPF. The results obtained from this research will provide a fundamental basis for developing and improving models that rely on the prediction of nanoparticle growth by carbonaceous matter.

在这个由国家科学基金会化学部环境化学科学项目资助的项目中，特拉华州大学的默里约翰斯顿教授正在研究纳米颗粒在大气中生长的化学机制。该项目将支持三名研究生的工作。这些学生将接受广泛的培训，能够在环境化学，工业分析化学，仪器仪表，纳米科学或学术界等领域从事职业。社会将受益于培养能够预测人类活动如何影响气候的学生。约翰斯顿教授和研究生们还将致力于提高特拉华州大学本科生和公众对环境科学的认识，将这项工作的概念和结果纳入正式的课程和公共宣传活动。纳米颗粒生长得足够快，可以达到一定的大小，在那里它们作为种子形成云滴。了解这些粒子是如何生长的，将有助于开发更好的模型来预测云的形成及其对气候的影响。目前的区域和全球大气模型在预测新粒子形成（NPF）过程中碳质物质对纳米粒子生长速率的贡献方面能力有限。这一知识缺口是确定NPF对当今气候和气候强迫（前工业时代和现在的差异）的影响的最大不确定性。所提出的工作的具体目标是阐明NPF过程中碳质物质的纳米颗粒生长的化学机制。从这项研究中获得的结果将为开发和改进依赖于碳质物质的纳米颗粒生长预测的模型提供基础。