The Impacts of Phase Separation and Particle Shape on Aerosol Optical Properties Measured using Single Particle Cavity Ring-Down Spectroscopy

相分离和颗粒形状对使用单颗粒腔衰荡光谱测量的气溶胶光学性质的影响

基本信息

批准号：
2886474
负责人：
金额：
--
依托单位：
University of Bristol
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2023
资助国家：
英国
起止时间：
2023 至无数据
项目状态：
未结题

来源：
https://gtr.ukri.org/projects?ref=studentship-2886474
关键词：
Impacts Phase Separation Particle Shape

Impacts Phase Separation Particle Shape

项目摘要

Atmospheric aerosol particles regulate Earth's climate, yet their description represents one of the largest uncertainties in climate models. In particular, the interactions of light with atmospheric particles of varying shape and internal structure are understood poorly. The optical properties of morphologically complex aerosols are also important in understanding disease transmission. For example, pathogen-containing droplets emitted during human exhalation are thought to exhibit multiple phases,1,2 and understanding their optical properties is central to designing sterilisation devices that could improve public health. Liquid droplets adopt spherical shapes for which the calculation of optical properties are straightforward. However,solid particles (such as those formed through drying of aqueous droplets that contain dissolved salts) adopt a wide range of shapes that scatter and absorb light in complex ways. Particles also adopt a wide range of internal structures. For example, an aqueous particle comprised of a mixture of organic and inorganic species may undergo liquid-liquid phase separation (LLPS), the optical properties for which will differ from those expected of a homogeneous particle.Few studies have measured the impacts of shape or LLPS on aerosol optical properties with sufficient accuracy or sensitivity to challenge optical models thatdescribe morphologically complex particles.

大气气溶胶颗粒调节地球的气候，但它们的描述代表了气候模型中最大的不确定性之一。特别是，光与不同形状和内部结构的大气颗粒的相互作用很差。形态复杂的气溶胶的光学特性对于理解疾病传播也很重要。例如，人们认为在人类呼气期间发出的含病原体的液滴表现出多个阶段，1,2，了解它们的光学特性对于设计可以改善公共健康的灭菌装置至关重要。液滴采用球形形状，光学特性的计算很简单。但是，固体颗粒（例如通过干燥含有溶解盐的水滴形成的颗粒）采用各种形状，这些形状以复杂的方式散射和吸收光。颗粒还采用了广泛的内部结构。例如，由有机和无机物质的混合物组成的水粒子可能会经历液态液相分离（LLP），其光学特性与均匀粒子的预期的光学特性都不同。FEF研究测量了形状或LLP对具有足够精确性或敏感性的颗粒界模型的形状或llps opericol opertical promistical optical optical optical optical sorpodication sordscord的影响。