Collaborative Research: Humidity and Temperature Effects on Phase Separation and Particle Morphology in Internally Mixed Organic-Inorganic Aerosol
合作研究:湿度和温度对内部混合有机-无机气溶胶中相分离和颗粒形态的影响
基本信息
- 批准号:2108004
- 负责人:
- 金额:$ 45万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2021
- 资助国家:美国
- 起止时间:2021-09-01 至 2024-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
With support from the Environmental Chemical Sciences Program in the Division of Chemistry at NSF, James Davies of the University of California-Riverside (UCR) and Ryan Davis of Trinity University will study the phase state of mixed organic-inorganic aerosol particles under environmental conditions. Aerosols influence climate as they form the basis of clouds and are engaged in both the scattering and the absorption of sunlight. Aerosols can also negatively affect air quality and provide a vehicle for the spread of airborne disease. The specific environmental impact associated with aerosols depends upon the chemical composition and phase state of the aerosol particles. Inadequate knowledge of the phase state of organic-inorganic aerosols, such as those found in the environment, represents a source of uncertainty in climate and air quality models. Mixed organic-inorganic particles can form a range of phase states depending on environmental conditions; these include liquid and solid phases, and amorphous phases, such as viscous liquids, glasses, and gels. This project will explore the formation of amorphous phase states in aerosol particles and characterizes the properties that determine their impacts in the environment. This collaboration between UC Riverside and Trinity University will facilitate undergraduate and graduate research across both institutions and seeks to provide for an improved understanding of aerosol chemistry across a range of scientific disciplines.To enhance knowledge of aerosol particles in the environment, this project is a collaborative study between teams at an R1 public university, UC-Riverside--the James Davies research group--and at a predominantly undergraduate liberal arts and sciences university, Trinity University--the Ryan Davis research group--will examine the role of temperature and relative humidity on the phase state and associated properties of internally mixed organic-inorganic aerosol particles. Aerosol particles containing mixtures of organic and inorganic compounds exhibit complex phase behavior in response to changes in relative humidity (RH) and temperature due to hygroscopic interactions. The phase morphology of aerosol particles influences their interactions with light, their response to chemical processing due to changes in viscosity, and their ice and cloud nucleating potential. This proposal will investigate the phase morphology and associated rheological properties of internally mixed organic-inorganic aerosol particles exposed to controlled RH and temperature conditions. The main objectives are: (1) systematically characterize the hygroscopicity and viscosity of particles containing atmospherically-relevant salts and oxygenated organics; (2) determine the temperature and humidity conditions for the onset of phase separation and correlate with molecular composition; and (3) explore the consequences of viscosity and phase separation on the rate of molecular diffusion. To achieve these goals, single particles of aqueous oxygenated organic compounds and atmospherically-relevant mono- and divalent salts will be levitated using an electrodynamic balance. Optical spectroscopy, microscopy and light scattering methods will be used to identify phase separation while new and established characterization methods will be applied to measure hygroscopic growth, viscosity, and diffusive transport. The research will help to motivate the next generation of scientists by exposing undergraduate and graduate researchers to the physically rigorous study and characterization of aerosols in a project that relates more generally to climate science research, an area of great societal interest and importance today.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.
在 NSF 化学部环境化学科学项目的支持下,加州大学河滨分校 (UCR) 的 James Davies 和三一大学的 Ryan Davis 将研究环境条件下混合有机-无机气溶胶颗粒的相态。气溶胶影响气候,因为它们形成云的基础,并参与阳光的散射和吸收。气溶胶还会对空气质量产生负面影响,并为空气传播疾病的传播提供媒介。与气溶胶相关的具体环境影响取决于气溶胶颗粒的化学成分和相态。对有机-无机气溶胶(例如环境中发现的气溶胶)相态的了解不足,是气候和空气质量模型不确定性的一个来源。混合的有机-无机颗粒可以根据环境条件形成一系列相态;这些包括液相和固相以及无定形相,例如粘性液体、玻璃和凝胶。该项目将探索气溶胶颗粒中非晶态相的形成,并表征决定其对环境影响的特性。加州大学河滨分校和三一大学之间的合作将促进两个机构的本科生和研究生研究,并寻求提高对一系列科学学科的气溶胶化学的理解。为了增强对环境中气溶胶颗粒的了解,该项目是一个合作项目R1公立大学加州大学河滨分校(詹姆斯·戴维斯研究小组)和一所以本科生为主的文科和理科大学三一大学(瑞安·戴维斯研究小组)的团队之间的研究将考察温度和相对湿度对内部混合有机-无机气溶胶颗粒的相态和相关特性的影响。含有有机和无机化合物混合物的气溶胶颗粒由于吸湿相互作用而表现出复杂的相行为,以响应相对湿度 (RH) 和温度的变化。气溶胶颗粒的相形态影响它们与光的相互作用、它们因粘度变化而对化学处理的响应,以及它们的冰和云成核潜力。该提案将研究暴露在受控相对湿度和温度条件下的内部混合有机-无机气溶胶颗粒的相形态和相关流变特性。主要目标是:(1)系统地表征含有大气相关盐和含氧有机物的颗粒的吸湿性和粘度; (2) 确定相分离开始的温度和湿度条件并与分子组成相关联; (3) 探讨粘度和相分离对分子扩散速率的影响。为了实现这些目标,将使用电动天平使水性含氧有机化合物和大气相关的一价和二价盐的单个颗粒悬浮。光谱、显微镜和光散射方法将用于识别相分离,而新的和已建立的表征方法将用于测量吸湿性增长、粘度和扩散传输。 该研究将有助于激励下一代科学家,让本科生和研究生研究人员在一个与气候科学研究更广泛相关的项目中进行物理上严格的气溶胶研究和表征,这是当今具有巨大社会兴趣和重要性的领域。该奖项反映了 NSF 的法定使命,并通过使用基金会的智力价值和更广泛的影响审查标准进行评估,被认为值得支持。
项目成果
期刊论文数量(2)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Phase State and Relative Humidity Regulate the Heterogeneous Oxidation Kinetics and Pathways of Organic-Inorganic Mixed Aerosols
相态和相对湿度调节有机-无机混合气溶胶的非均相氧化动力学和途径
- DOI:10.1021/acs.est.2c04670
- 发表时间:2022-11
- 期刊:
- 影响因子:11.4
- 作者:Shen, Chuanyang;Zhang, Wen;Choczynski, Jack;Davies, James F.;Zhang, Haofei
- 通讯作者:Zhang, Haofei
Exploring the hygroscopicity, water diffusivity, and viscosity of organic–inorganic aerosols – a case study on internally-mixed citric acid and ammonium sulfate particles
探索有机-无机气溶胶的吸湿性、水扩散性和粘度——内部混合柠檬酸和硫酸铵颗粒的案例研究
- DOI:10.1039/d2ea00116k
- 发表时间:2023-01
- 期刊:
- 影响因子:0
- 作者:Sheldon, Craig S.;Choczynski, Jack M.;Morton, Katie;Palacios Diaz, Teresa;Davis, Ryan D.;Davies, James F.
- 通讯作者:Davies, James F.
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James Davies其他文献
Improved bounds for colouring circle graphs
改进了圆形图着色的范围
- DOI:
- 发表时间:
2021 - 期刊:
- 影响因子:0
- 作者:
James Davies - 通讯作者:
James Davies
Disrupting TLR2 Triggering Compromising Bacterial Clearance by Soluble TLR2 Reduces Inflammation without
通过可溶性 TLR2 破坏 TLR2 触发从而损害细菌清除,从而减少炎症,而无需
- DOI:
10.1097/mco.0000000000000902 - 发表时间:
2009 - 期刊:
- 影响因子:3.1
- 作者:
A. Raby;E. L. Bouder;C. Colmont;James Davies;P. Richards;B. Coles;C. H. George;Simon A. Jones;P. Brennan;N. Topley;M. Labéta - 通讯作者:
M. Labéta
Bio-SHARPE: Bioinspired Soft and High Aspect Ratio Pumping Element for Robotic and Medical Applications.
Bio-SHARPE:用于机器人和医疗应用的仿生软高纵横比泵元件。
- DOI:
10.1089/soro.2021.0154 - 发表时间:
2023-05-02 - 期刊:
- 影响因子:7.9
- 作者:
James Davies;M. Thai;Harrison Low;P. T. Phan;T. Hoang;N. Lovell;Thanh Nho Do - 通讯作者:
Thanh Nho Do
Using GPS and recall to understand water collection in Kenyan informal settlements
使用 GPS 和回忆来了解肯尼亚非正规住区的水收集情况
- DOI:
- 发表时间:
2013 - 期刊:
- 影响因子:0
- 作者:
B. Crow;James Davies;S. Paterson;Julio Miles - 通讯作者:
Julio Miles
of HLA-I by the
HLA-I 的
- DOI:
- 发表时间:
2023 - 期刊:
- 影响因子:0
- 作者:
Hana Elasifer;E. Wang;Virginie Prod’homme;James Davies;Simone K. Forbes;Richard J. Stanton;Mihil Patel;Ceri A Fielding;Dawn Roberts;J. Traherne;Nicole Gruber;J. Bugert;Rebecca J. Aicheler;G. W. Wilkinson - 通讯作者:
G. W. Wilkinson
James Davies的其他文献
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{{ truncateString('James Davies', 18)}}的其他基金
CAREER: Exploring the Physical and Chemical Properties of Light-Absorbing Aerosol: A Single Particle Approach
职业:探索光吸收气溶胶的物理和化学性质:单粒子方法
- 批准号:
2144005 - 财政年份:2022
- 资助金额:
$ 45万 - 项目类别:
Continuing Grant
Functional genomics and development of clinical genome editing strategies
功能基因组学和临床基因组编辑策略的开发
- 批准号:
MC_UU_00029/4 - 财政年份:2022
- 资助金额:
$ 45万 - 项目类别:
Intramural
Development of highly sensitive methods for defining off target mutations to enable safe gene editing of haematopoietic cells for transplantation
开发高度灵敏的方法来定义脱靶突变,以实现对移植用造血细胞的安全基因编辑
- 批准号:
MR/R008108/1 - 财政年份:2018
- 资助金额:
$ 45万 - 项目类别:
Fellowship
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相似海外基金
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合作研究:湿度和温度对内部混合有机-无机气溶胶中相分离和颗粒形态的影响
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2123209 - 财政年份:2022
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合作研究:湿度和温度对内部混合有机-无机气溶胶中相分离和颗粒形态的影响
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针对野火暴露的 AI/ML 准备方法。
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