Collaborative Research: Exploring the Role of Organics in Atmospheric Contact Nucleation

合作研究：探索有机物在大气接触成核中的作用

• 批准号: 1925208
• 负责人: Ryan Davis
• 金额: $ 12.75万
• 依托单位: Trinity University
• 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: 2019-08-15 至 2023-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1925208&HistoricalAwards=false
• 关键词: Collaborative; Research; Exploring; Role; Organics

This project is focused on the study of a mechanism for the formation of ice particles in mixed phase clouds in the atmosphere. This mechanism, called contact nucleation, occurs when an ice nucleating particle collides with the surface of a supercooled cloud droplet. The results of this research will improve the ability to model particles and clouds in the Earth's atmosphere.The research will test the following hypotheses: (1) Organic particles can act as contact nuclei to promote efflorescence of mixed organic-inorganic aqueous droplets, and the effectiveness of the organic will depend on composition of the aqueous phase; temperature and relative humidity; and composition, oxidation, viscosity, morphology, and size of the contact nuclei; and (2) Organic particles can act as contact nuclei to promote ice nucleation, and the effectiveness of the organic will depend on composition of the aqueous phase; temperature; and composition, oxidation, viscosity, morphology, and size of the contact nuclei. The experiments will be conducted using two complementary levitation techniques that allow freely-floating droplets to undergo single collisions with well-defined contact nuclei: a long working distance optical trap and a dual stage electrodynamic balance.These studies are expected to provide fundamental data on contact nucleation that currently are not available in the literature. This effort will lead to improved theoretical descriptions of heterogeneous nucleation and enable contact nucleation to be included in atmospheric models that predict the formation of ice particles in the atmosphere.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.

该项目的重点是研究大气中混合相云中冰粒的形成机制。 这种机制，称为接触成核，发生在冰成核粒子与过冷云滴的表面碰撞时。 本研究的结果将提高模拟地球大气中粒子和云的能力，并验证以下假设：（1）有机粒子可以作为接触核促进有机-无机混合水滴的风化，有机粒子的有效性取决于水相的组成、温度和相对湿度;以及接触核的组成、氧化、粘度、形态和尺寸;以及（2）有机颗粒可以充当接触核以促进冰成核，并且有机颗粒的有效性将取决于水相的组成、温度;以及接触核的组成、氧化、粘度、形态和尺寸。实验将使用两个互补的悬浮技术，使自由浮动的液滴进行单次碰撞与定义明确的接触nuclei：一个长的工作距离的光阱和一个双阶段electrodynamic balances.These研究预计将提供接触成核的基本数据，目前还没有在文献中。这一努力将导致改进的理论描述的非均质成核，并使接触成核被纳入大气模型，预测形成的冰粒在atmos.This奖项反映了美国国家科学基金会的法定使命，并已被认为是值得的支持，通过评估使用基金会的智力价值和更广泛的影响审查标准。

项目成果

Dual-Balance Electrodynamic Trap as a Microanalytical Tool for Identifying Gel Transitions and Viscous Properties of Levitated Aerosol Particles

双平衡电动阱作为微分析工具，用于识别悬浮气溶胶颗粒的凝胶转变和粘性特性

• DOI: 10.1021/acs.analchem.9b04487
• 发表时间: 2020
• 期刊: Analytical Chemistry
• 影响因子: 7.4
• 作者: Richards, David S.;Trobaugh, Kristin L.;Hajek-Herrera, Josefina;Davis, Ryan D.
• 通讯作者: Davis, Ryan D.

Tutorial: Electrodynamic balance methods for single particle levitation and the physicochemical analysis of aerosol

• DOI: 10.1016/j.jaerosci.2023.106255
• 发表时间: 2023-09-12
• 期刊: JOURNAL OF AEROSOL SCIENCE
• 影响因子: 4.5
• 作者: Kohli，Ravleen Kaur;Davis，Ryan D.;Davies，James F.
• 通讯作者: Davies，James F.