活动类型：

学术活动
活动名称：

对流层气溶胶界面氧化剂产生的奥秘 The mystery of Interfacial oxidant production on tropospheric aerosols
地点：

雁栖湖教二楼一层 教2-138

主讲人：

韩颖慧
联系人：

韩颖慧
联系方式：

13126979811
开始时间：

2024-07-08 09:30
结束时间：

2024-07-08 12:00
说明:

Aerosols and clouds are key players in tropospheric chemistry. These tiny particles suspended in the air, with a radius ranging from a few nanometres to tens of micrometres, impact atmospheric composition, represent one of the largest uncertainties in climatic projections and cause millions of deaths worldwide every year. Hence, they have enormous societal and economic consequences. Nonetheless, there is still a knowledge gap preventing us from describing the chemical evolution of aerosols and clouds during their atmospheric lifetime.

Water molecules in bulk liquid are stable and inert under ambient conditions. In sharp contrast, it was very recently shown that the local orientation of water molecules at an air/water interface induces an electric field that generates spontaneous radicals in micron-sized droplets. This production does not involve any catalysts such as light or heat. It is an intrinsic property of the air/water interface, and therefore potentially ubiquitous in the troposphere.

This spontaneous interfacial oxidant formation has never been explored for its atmospheric significance. Therefore, this presentation aims to unravel the atmospheric importance of this interfacial (dark) chemistry. If oxidants (including OH radicals) are in fact spontaneously produced at the air-water interface, under atmospherically relevant concentrations, this would profoundly challenge our understanding and description of atmospheric multiphase chemistry.