Collaborative Research: Kinetics and Mechanism of Restructuring of Atmospheric Soot and Associated Impact on Light Absorption

合作研究：大气烟尘重组的动力学和机制以及对光吸收的相关影响

• 批准号: 1463702
• 负责人: Alexei Khalizov
• 金额: $ 39.55万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-07-15 至 2020-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1463702&HistoricalAwards=false
• 关键词: Collaborative; Research; Kinetics; Mechanism; Restructuring

Nanoparticulate atmospheric soot particles are complex in their shape, size and chemical composition. They can be variably observed as fractal aggregates composed of elemental carbon (EC- in graphitic or graphene structures), or organic carbon compounds (OC - hydrocarbons with oxidized or other attached heteroatom moieties). Other aerosol materials potentially embed or enmesh, in either internal or external mixing states, such soot particles as they age in the ambient atmosphere. Our limited knowledge of relationships between soot mixing state, soot morphology, and soot optical properties, remains a major source of uncertainty in evaluating the optical and radiative contribution of carbonaceous aerosols to direct radiative) climate forcing. Researchers will undertake a series of combined laboratory and computational studies to better characterize the formation of soot particles with different mixing states, and to investigate associated structural and optical properties in relation to the particle initial state and aerosol aging. Mixing states and morphology of soot aggregates will be determined from a combination of mass-mobility measurements and environmental scanning electron microscopy imaging. Optical calculations constrained by the experimentally measured mixing states and morphologies will provide a closure with directly determined light absorption and scattering by this range of carbonaceous soot.One broader impact of this work will be the promotion of collaboration between faculty at a PhD-granting and a primarily undergraduate teaching university.

纳米齿状大气烟灰颗粒的形状，大小和化学成分很复杂。它们可以被多样化为由元素碳（石墨或石墨烯结构）或有机碳化合物（具有氧化或其他附着的杂原子部分）组成的分形骨料。其他气溶胶材料可能会嵌入或嵌入内部或外部混合状态，例如在环境大气中年龄的烟灰颗粒。我们对烟灰混合状态，烟灰形态和烟灰光学特性之间关系的有限了解仍然是评估碳素气溶胶对导向辐射性辐射强迫的光学和辐射贡献的主要不确定性来源。研究人员将进行一系列合并的实验室和计算研究，以更好地表征具有不同混合状态的烟灰颗粒的形成，并研究与颗粒初始状态和气溶胶老化有关的相关结构和光学特性。烟灰骨料的混合状态和形态将取决于质量计量测量和环境扫描电子显微镜成像的组合。受实验测得的混合状态和形态限制的光学计算将通过这项碳烟灰范围的直接确定的光吸收和散射提供封闭。这项工作的更广泛的影响将是促进在博士学位上的教师之间的合作，而主要的教学大学则是一所主要的教学大学。