亚 - 搏手机版登入页面界面

您的当前位置: 首页 学术动态 学术报告 正文
学术报告
龙山环境论坛(第61期):特邀加州大学尔湾分校覃意茗博士来我校作学术报告
2022年11月14日    作者:     发布 : 李梦轩    

 

报告题目:Toward a molecular understanding of the surface composition of atmospherically relevant organic particle

报告人:覃意茗 博士

报告时间:20221116上午12:00

腾讯会议:728-123-031

主持人: 汪俊峰 博士

专家简介:博士毕业于哈佛大学,现任加州大学尔湾分校博士后研究员。先后发表SCI论文20篇,其中以第一作者发表8包括PNAS、EST及多篇ACP。

 

Abstract:

Airborne particles play an important role in human health, air quality, and global climate. Historically, aerosol particles were considered to be uniform in composition. It has recently been discovered that many aerosol particles can be highly viscous and therefore have very long mixing times, potentially causing chemical inhomogeneities. Less viscous particles may experience liquid - liquid phase separation, also making them inhomogeneous. While the surface makes up a small fraction of the particle mass, incoming gases interact at this interface first. Thus, the surface can determine how particles take up vapors to grow to the size that scatters light, take up water vapor leading to cloud condensation nuclei, and interact with biological systems up on inhalation.

Many mass spectrometry methods using various ionization sources provide the bulk composition of airborne particles, but little is known about what molecules are on the particle surface. Our recent work shows that the composition of surface layers of atmospherically relevant sub-micron organic particles can be probed without the use of an external ionization source. Solid dicarboxylic acid particles are used as models, with glutaric acid being the most efficient at generating ions. Coating with small diacids or products from a - pinene ozonolysis demonstrates that ions are ejected from the surface, providing a surface molecular characterization of organic particles on-the-fly. This unique approach provides a path forward for elucidating the role of the surface in determining the chemical and physical properties of particles, including heterogeneous reactions, particle growth, water uptake, and interactions with biological system.

 

欢迎广大师生踊跃参加!

 

江苏省大气环境监测与污染控制高技术研究重点实验室

江苏省大气环境与装备技术协同创新中心

亚 - 搏手机版登入页面界面

20221114


  • 亚 - 搏手机版登入页面界面官方微信
网站首页 | 关于本站 | 法律声明 | 网站统计 | 网站地图 | 教师登录 | 高级搜索

亚 - 搏手机版登入页面界面版权所有 ? 2020
地址:江苏省南京市宁六路219号   邮编:210044   NUIST备80143
请使用Chrome或IE8以上浏览器  

亚 - 搏手机版登入页面界面