Nanodroplet Aerosols: Formation and Structure

纳米液滴气溶胶：形成和结构

• 批准号: 0410037
• 负责人: Barbara Wyslouzil
• 金额: $ 14.47万
• 依托单位: Ohio State University Research Foundation -DO NOT USE
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-11-15 至 2005-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0410037&HistoricalAwards=false
• 关键词: Nanodroplet; Aerosols; Formation; Structure

In this project funded by the Physical Chemistry Program of the Chemistry Division, Barbara Wyslouzil of the Worcester Polytechnic Institute will pursue a program of research on nanodroplet aerosols. The formation of liquid droplets in aerosols will be studied with a view to measuring and understanding nucleation from a phase transition perspective. Small angle neutron scattering (SANS) will be used to experimentally monitor particle size and composition and structure, and infrared (IR) measurements will be used to aid in the compositional analysis during nucleation and droplet formation. The research program is two pronged. First, a deeper understanding of phase transitions under conditions that are far from equilibrium will be obtained. Very high cooling rates insure that nuleation and condensation (phase transition) occur under highly supersaturated conditions. Intrinsic size distribution data from SANS measurements are expected to provide the first direct experimental measurements of nucleation rates in nozzles. Second, the internal structure of multi-component droplets will be discerned. The compositional and structural data will be used to test various models for the droplet structure. Key among the compositional factors to be examined is the degree to which immiscible phases mix and the clarity with which phase boundaries develop between immiscible liquids. This project will lead to a deeper understanding of how multicomponent droplets form. The results of the work will benefit society in helping to understand the physical chemistry of droplet nucleation, and this knowledge will benefit weather and climate studies and industrial processes based upon aerosol droplet formation. The work also will have a high impact on teaching undergradute and graduate students advanced materials science experimental and analysis techniques.

在化学部的物理化学计划资助的该项目中，伍斯特理工学院的芭芭拉·韦斯鲁齐尔（Barbara Wyslouzil）将探讨一项关于纳米光气溶胶的研究计划。 将研究气溶胶中液滴的形成，以从相变的角度来测量和理解成核。 小角度中子散射（SAN）将用于实验监测粒径，组成和结构，红外（IR）测量将用于在成核和液滴形成过程中有助于进行组成分析。 研究计划是两个人。 首先，将获得对远离平衡的条件下的相变的更深入的理解。 非常高的冷却速率确保在高度超饱和条件下发生ul缩和凝结（相变）。 预计来自SANS测量的固有尺寸分布数据有望提供对喷嘴中成核速率的首次直接实验测量。 其次，将辨别多组分液滴的内部结构。 组成和结构数据将用于测试液滴结构的各种模型。 要研究的组成因素的关键是不混溶的阶段混合在一起的程度以及在不混溶液体之间形成相位边界的清晰度。该项目将导致对多组分液滴的形成方式有更深入的了解。 该工作的结果将使社会受益，以帮助了解液滴成核的物理化学反应，并且这些知识将使天气和气候研究以及基于气溶胶液滴形成的工业过程受益。 这项工作还将对教学本科和研究生高级材料科学实验和分析技术产生重大影响。